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dialogs.c

/*
 *  Copyright (c) by Allin Cottrell
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/* dialogs.c for gretl */

#include "gretl.h"
#include "cmdstack.h"
#include "session.h"
#include "obsbutton.h"
#include "textutil.h"
#include "menustate.h"
#include "dlgutils.h"
#include "ssheet.h"
#include "database.h"
#include "gretl_panel.h"

static int all_done;

static GtkWidget *option_spinbox (int *spinvar, const char *spintxt,
                          int spinmin, int spinmax,
                          gpointer p);
static void set_radio_opt (GtkWidget *w, int *opt);

void menu_exit_check (GtkWidget *w, gpointer data)
{
    int ret = exit_check(w, NULL, data);

    if (ret == FALSE) {
      gtk_main_quit();
    }
}

static void save_data_callback (void)
{
    file_save(NULL, SAVE_DATA, NULL);
    if (data_status & MODIFIED_DATA)
      data_status ^= MODIFIED_DATA;
    /* FIXME: need to do more here? */
}

gint yes_no_dialog (char *title, char *msg, int cancel)
{
    GtkWidget *dialog, *label, *hbox;
    int ret = GTK_RESPONSE_HELP;

    dialog = gtk_dialog_new_with_buttons (title,
                                NULL,
                                GTK_DIALOG_MODAL | 
                                GTK_DIALOG_DESTROY_WITH_PARENT,
                                GTK_STOCK_YES,
                                GTK_RESPONSE_ACCEPT,
                                GTK_STOCK_NO,
                                GTK_RESPONSE_NO,
                                NULL);
    
    if (cancel) {
      gtk_dialog_add_button (GTK_DIALOG(dialog),
                         GTK_STOCK_CANCEL,
                         GTK_RESPONSE_REJECT);
    }

    label = gtk_label_new(msg);
    gtk_widget_show(label);
    hbox = gtk_hbox_new(FALSE, 0);
    gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, FALSE, 12);
    gtk_widget_show(hbox);
    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox),
                   hbox, FALSE, FALSE, 12);

    gtk_dialog_set_has_separator(GTK_DIALOG(dialog), FALSE);

    ret = gtk_dialog_run(GTK_DIALOG(dialog));
                                
    gtk_widget_destroy(dialog);

    switch (ret) {
    case GTK_RESPONSE_ACCEPT: 
      return GRETL_YES; 
    case GTK_RESPONSE_NO: 
      return GRETL_NO; 
    default: 
      return GRETL_CANCEL;
    }
}

gint exit_check (GtkWidget *widget, GdkEvent *event, gpointer data) 
{
    int resp;
    const char regular_save_msg[] = {
      N_("Do you want to save the commands and\n"
         "output from this gretl session?")
    };
    const char session_save_msg[] = {
      N_("Do you want to save the changes you made\n"
         "to this session?")
    };

#ifdef ALWAYS_SAVE_SESSION
    char fname[MAXLEN];
    
    strcpy(fname, paths.userdir);
    strcat(fname, "session.inp");
    dump_cmd_stack(fname, 0);
#endif

    if (maybe_raise_dialog()) {
      return TRUE;
    }

    if (!expert && !replaying() && 
      (session_changed(-1) || (work_done() && !session_is_saved()))) {

      resp = yes_no_dialog ("gretl", 
                        (session_file_is_open()) ?
                        _(session_save_msg) : _(regular_save_msg), 
                        1);               

      if (resp == GRETL_YES) {
          save_session_callback(NULL, SAVE_RENAME, NULL);
          return TRUE; /* bodge */
      } else if (resp == GRETL_CANCEL || resp == -1) {
          /* resp -1 = wm close */
          return TRUE;
      }
      /* else resp = GRETL_NO: so fall through */
    }

    if (data_status & MODIFIED_DATA) {
      resp = yes_no_dialog ("gretl", 
                        _("Do you want to save changes you have\n"
                        "made to the current data set?"), 1);
      if (resp == GRETL_YES) {
          save_data_callback();
          return TRUE; 
      } else if (resp == GRETL_CANCEL || resp == -1) {
          return TRUE;
      }
    } 

    write_rc();

    all_done = 1;

    return FALSE;
}

/* CSV files: setting the delimiter */

typedef struct {
    GtkWidget *space_button;
    GtkWidget *point_button;
    gint delim;
    gint decpoint;
} csv_stuff;

#ifdef ENABLE_NLS
static void set_dec (GtkWidget *w, csv_stuff *csv)
{
    gint i;

    if (GTK_TOGGLE_BUTTON(w)->active) {
      i = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(w), "action"));
      csv->decpoint = i;
      if (csv->decpoint == ',' && csv->delim == ',') {
          csv->delim = ' ';
          gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (csv->space_button), 
                                TRUE);
      }
    }
}
#endif

static void set_delim (GtkWidget *w, csv_stuff *csv)
{
    gint i;

    if (GTK_TOGGLE_BUTTON(w)->active) {
      i = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(w), "action"));
      csv->delim = i;
      if (csv->point_button != NULL && 
          csv->delim == ',' && csv->decpoint == ',') {
          csv->decpoint = '.';
          gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(csv->point_button), 
                               TRUE);
      }
    }
}

static void set_obscol (GtkWidget *w, gretlopt *optp)
{
    if (GTK_TOGGLE_BUTTON(w)->active) {
      *optp = OPT_NONE;
    } else {
      /* omit-obs option to "store" command */
      *optp = OPT_X;
    }
}

static void really_set_csv_stuff (GtkWidget *w, csv_stuff *csv)
{
    datainfo->delim = csv->delim;
    datainfo->decpoint = csv->decpoint;
}

static void destroy_delim_dialog (GtkWidget *w, gint *p)
{
    free(p);
}

void delimiter_dialog (gretlopt *optp)
{
    GtkWidget *dialog, *tmp, *button, *hbox;
    GtkWidget *myvbox;
    GSList *group;
    csv_stuff *csvp = NULL;

    csvp = mymalloc(sizeof *csvp);
    if (csvp == NULL) return;

    csvp->delim = datainfo->delim;
    csvp->decpoint = '.';
    csvp->point_button = NULL;

    dialog = gretl_dialog_new(_("gretl: data delimiter"), NULL, GRETL_DLG_BLOCK);

    g_signal_connect(G_OBJECT(dialog), "destroy", 
                 G_CALLBACK(destroy_delim_dialog), csvp);

    myvbox = gtk_vbox_new(FALSE, 5);

    hbox = gtk_hbox_new(FALSE, 5);
    tmp = gtk_label_new(_("separator for data columns:"));
    gtk_box_pack_start(GTK_BOX(hbox), tmp, TRUE, TRUE, 5);
    gtk_widget_show(tmp);
    gtk_box_pack_start(GTK_BOX(myvbox), hbox, TRUE, TRUE, 5);
    gtk_widget_show(hbox);    

    /* comma separator */
    button = gtk_radio_button_new_with_label(NULL, _("comma (,)"));
    gtk_box_pack_start(GTK_BOX(myvbox), button, TRUE, TRUE, 0);
    if (csvp->delim == ',')
      gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON (button), TRUE);
    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_delim), csvp);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER(','));
    gtk_widget_show(button);

    /* space separator */
    group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));
    button = gtk_radio_button_new_with_label(group, _("space"));
    csvp->space_button = button;
    gtk_box_pack_start(GTK_BOX(myvbox), button, TRUE, TRUE, 0);
    if (csvp->delim == ' ')
      gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), TRUE);
    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_delim), csvp);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER(' '));  
    gtk_widget_show(button);

    /* tab separator */
    group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));
    button = gtk_radio_button_new_with_label(group, _("tab"));
    gtk_box_pack_start(GTK_BOX(myvbox), button, TRUE, TRUE, 0);
    if (csvp->delim == '\t') {
      gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), TRUE);
    }
    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_delim), csvp);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER('\t'));    
    gtk_widget_show (button);

    /* semicolon separator */
    group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));
    button = gtk_radio_button_new_with_label(group, _("semicolon"));
    gtk_box_pack_start(GTK_BOX(myvbox), button, TRUE, TRUE, 0);
    if (csvp->delim == ';') {
      gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), TRUE);
    }
    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_delim), csvp);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER(';'));    
    gtk_widget_show (button);

#ifdef ENABLE_NLS
    if (',' == get_local_decpoint()) {
      GSList *decgroup;

      vbox_add_hsep(myvbox);

      hbox = gtk_hbox_new(FALSE, 5);
      tmp = gtk_label_new(_("decimal point character:"));
      gtk_box_pack_start(GTK_BOX(hbox), tmp, TRUE, TRUE, 5);
      gtk_widget_show(tmp);
      gtk_box_pack_start(GTK_BOX(myvbox), hbox, TRUE, TRUE, 5);
      gtk_widget_show(hbox);    

      /* period decpoint */
      button = gtk_radio_button_new_with_label(NULL, _("period (.)"));
      csvp->point_button = button;
      gtk_box_pack_start(GTK_BOX(myvbox), button, TRUE, TRUE, 0);
      if (csvp->decpoint == '.') {
          gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), TRUE);
      }
      g_signal_connect(G_OBJECT(button), "clicked",
                   G_CALLBACK(set_dec), csvp);
      g_object_set_data(G_OBJECT(button), "action", 
                    GINT_TO_POINTER('.'));
      gtk_widget_show(button);

      /* comma decpoint */
      decgroup = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));
      button = gtk_radio_button_new_with_label(decgroup, _("comma (,)"));
      gtk_box_pack_start(GTK_BOX(myvbox), button, TRUE, TRUE, 0);
      if (csvp->decpoint == ',') {
          gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), TRUE);
      }
      g_signal_connect(G_OBJECT(button), "clicked",
                   G_CALLBACK(set_dec), csvp);
      g_object_set_data(G_OBJECT(button), "action", 
                    GINT_TO_POINTER(','));   
      gtk_widget_show(button);
    }
#endif /* ENABLE_NLS */

    if (optp != NULL) {
      vbox_add_hsep(myvbox);
      tmp = gtk_check_button_new_with_label(_("include observations column"));
      g_signal_connect(G_OBJECT(tmp), "toggled", G_CALLBACK(set_obscol), optp);
      gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(tmp), TRUE);
      gtk_box_pack_start(GTK_BOX(myvbox), tmp, TRUE, TRUE, 0);
      gtk_widget_show(tmp);
    }

    hbox = gtk_hbox_new(FALSE, 5);
    gtk_box_pack_start(GTK_BOX(hbox), myvbox, TRUE, TRUE, 5);
    gtk_widget_show(hbox);

    gtk_widget_show(myvbox);

    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), hbox, TRUE, TRUE, 5);
    gtk_widget_show(hbox);

    /* Create the "OK" button */
    tmp = ok_button(GTK_DIALOG(dialog)->action_area);
    g_signal_connect(G_OBJECT(tmp), "clicked",
                 G_CALLBACK(really_set_csv_stuff), csvp);
    g_signal_connect(G_OBJECT(tmp), "clicked", 
                 G_CALLBACK(delete_widget), dialog);
    gtk_widget_grab_default(tmp);
    gtk_widget_show(tmp);

    gtk_widget_show(dialog);
}

/* selection of format in which to copy material to clipboard,
   or save to file */

struct format_info {
    GtkWidget *dialog;
    windata_t *vwin;
    int format;
    int multi;
    int action;
};

static void destroy_format_dialog (GtkWidget *w, struct format_info *finfo)
{
    free(finfo);
}

static void copy_with_format_callback (GtkWidget *w, struct format_info *finfo)
{
    gtk_widget_hide(finfo->dialog);

    if (finfo->action == W_COPY) {
      window_copy(finfo->vwin, finfo->format, NULL);
    } else {
      window_save(finfo->vwin, finfo->format);
    }

    gtk_widget_destroy(finfo->dialog);
}

static int preferred_format (int f, int multi)
{
# ifdef G_OS_WIN32
    static int multi_pref = GRETL_FORMAT_RTF;
    static int simple_pref = GRETL_FORMAT_TXT;
# else 
    static int multi_pref = GRETL_FORMAT_TEX;
    static int simple_pref = GRETL_FORMAT_TXT;
#endif
    int ret;

    if (multi) {
      if (f) multi_pref = f;
      ret = multi_pref;
    } else {
      if (f) simple_pref = f;
      ret = simple_pref;
    }

    return ret;
}

static void set_copy_format (GtkWidget *w, struct format_info *finfo)
{
    gpointer p = g_object_get_data(G_OBJECT(w), "format");

    if (p != NULL) {
      int f = GPOINTER_TO_INT(p);

      finfo->format = f;
      if (f != GRETL_FORMAT_CSV) {
          preferred_format(finfo->format, finfo->multi);
      }
    }
}

static GtkWidget *
TeX_copy_button (GSList *group, GtkWidget *vbox, struct format_info *finfo,
             int pref)
{
    GtkWidget *button;

    button = gtk_radio_button_new_with_label(group, "LaTeX");
    gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);
    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_copy_format), finfo);
    g_object_set_data(G_OBJECT(button), "format", 
                  GINT_TO_POINTER(GRETL_FORMAT_TEX));
    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), 
                         (pref == GRETL_FORMAT_TEX));
    gtk_widget_show(button); 

    return button;
}  

static GtkWidget *
RTF_copy_button (GSList *group, GtkWidget *vbox, struct format_info *finfo,
             int pref)
{
    GtkWidget *button;

#ifdef G_OS_WIN32
    button = gtk_radio_button_new_with_label(group, "RTF (MS Word)");
#else
    button = gtk_radio_button_new_with_label(group, "RTF");
#endif
    gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);
    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_copy_format), finfo);
    if (finfo->multi) {
      g_object_set_data(G_OBJECT(button), "format", 
                    GINT_TO_POINTER(GRETL_FORMAT_RTF));  
    } else {
      g_object_set_data(G_OBJECT(button), "format", 
                    GINT_TO_POINTER(GRETL_FORMAT_RTF_TXT));
    }

    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), 
                         (pref == GRETL_FORMAT_RTF || 
                          pref == GRETL_FORMAT_RTF_TXT));
    gtk_widget_show(button);

    return button;
}

static GtkWidget *
tab_copy_button (GSList *group, GtkWidget *vbox, struct format_info *finfo,
             int pref)
{
    GtkWidget *button;

    button = gtk_radio_button_new_with_label(group, _("Tab separated"));
    gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);
    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_copy_format), finfo);
    g_object_set_data(G_OBJECT(button), "format", 
                  GINT_TO_POINTER(GRETL_FORMAT_TAB)); 

    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), 
                         (pref == GRETL_FORMAT_TAB));
    gtk_widget_show(button);

    return button;
}

static GtkWidget *
CSV_copy_button (GSList *group, GtkWidget *vbox, struct format_info *finfo,
             int pref)
{
    GtkWidget *button;

    button = gtk_radio_button_new_with_label(group, _("Comma separated"));
    gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);
    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_copy_format), finfo);
    g_object_set_data(G_OBJECT(button), "format", 
                  GINT_TO_POINTER(GRETL_FORMAT_CSV));  

    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), 
                         (pref == GRETL_FORMAT_CSV));
    gtk_widget_show(button);

    return button;
}

static GtkWidget *
plain_text_button (GSList *group, GtkWidget *vbox, struct format_info *finfo,
               int pref)
{
    GtkWidget *button;

    button = gtk_radio_button_new_with_label (group, _("plain text"));
    gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);
    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_copy_format), finfo);
    g_object_set_data(G_OBJECT(button), "format", 
                  GINT_TO_POINTER(GRETL_FORMAT_TXT));

    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button),
                         (pref == GRETL_FORMAT_TXT));
    gtk_widget_show(button);

    return button;
}

#define can_do_tabbed(v) ((v->role == PRINT && v->data != NULL) || \
                       v->role == VIEW_SERIES)

#define can_do_csv(v) ((v->role == PRINT && v->data != NULL) || \
                    v->role == VIEW_SERIES || \
                        v->role == VIEW_MODEL)

void copy_format_dialog (windata_t *vwin, int action)
{
    GtkWidget *dialog, *tempwid, *hbox;
    GtkWidget *button;
    GtkWidget *myvbox;
    GSList *group = NULL;
    struct format_info *finfo;
    int pref;

    finfo = mymalloc(sizeof *finfo);
    if (finfo == NULL) return;

    dialog = gretl_dialog_new(_("gretl: select format"), vwin->dialog, 
                        GRETL_DLG_BLOCK);

    finfo->vwin = vwin;
    finfo->dialog = dialog;

    finfo->multi = MULTI_FORMAT_ENABLED(vwin->role);
    finfo->format = pref = preferred_format(0, finfo->multi);
    finfo->action = action;

    g_signal_connect(G_OBJECT(dialog), "destroy", 
                 G_CALLBACK(destroy_format_dialog), finfo);

    myvbox = gtk_vbox_new(FALSE, 5);

    hbox = gtk_hbox_new(FALSE, 5);
    tempwid = gtk_label_new((action == W_COPY)? _("Copy as:") : _("Save as"));
    gtk_box_pack_start(GTK_BOX(hbox), tempwid, TRUE, TRUE, 5);
    gtk_widget_show(tempwid);
    gtk_box_pack_start(GTK_BOX(myvbox), hbox, TRUE, TRUE, 5);
    gtk_widget_show(hbox); 

    /* Tab-separated option */
    if (can_do_tabbed(vwin)) {
      button = tab_copy_button(group, myvbox, finfo, pref);
      group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));
    }

    /* Comma-separated option */
    if (can_do_csv(vwin)) {
      button = CSV_copy_button(group, myvbox, finfo, pref);
      group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));
    }

    /* plain text option */
    button = plain_text_button(group, myvbox, finfo, pref);
    group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));

# ifdef G_OS_WIN32

    if (finfo->multi || !can_do_tabbed(vwin)) {
      button = RTF_copy_button(group, myvbox, finfo, pref);
      group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));
    }

    if (finfo->multi) {
      button = TeX_copy_button(group, myvbox, finfo, pref);
      group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));
    }

# else /* not MS Windows: reverse RTF and LaTeX options */

    if (finfo->multi) {
      button = TeX_copy_button(group, myvbox, finfo, pref);
      group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));
    }

    if (finfo->multi || !can_do_tabbed(vwin)) {
      button = RTF_copy_button(group, myvbox, finfo, pref);
      group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));
    }

# endif /* G_OS_WIN32 */

    hbox = gtk_hbox_new(FALSE, 5);
    gtk_box_pack_start(GTK_BOX(hbox), myvbox, TRUE, TRUE, 5);
    gtk_widget_show(hbox);
    gtk_widget_show(myvbox);

    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), hbox, TRUE, TRUE, 5);
    gtk_widget_show(hbox);

    /* "Cancel" button */
    cancel_delete_button(GTK_DIALOG(dialog)->action_area, dialog, NULL);

    /* "OK" button */
    tempwid = ok_button(GTK_DIALOG(dialog)->action_area);
    g_signal_connect(G_OBJECT(tempwid), "clicked",
                 G_CALLBACK(copy_with_format_callback), finfo);
    gtk_widget_grab_default(tempwid);
    gtk_widget_show(tempwid);

    /* Help button if needed */
    if (can_do_tabbed(vwin)) {
      context_help_button(GTK_DIALOG(dialog)->action_area, COPY_FORMATS);
    } 

    gtk_widget_show(dialog);
}

/* dialog for setting various properties of individual variables */

struct varinfo_settings {
    GtkWidget *dlg;
    GtkWidget *name_entry;
    GtkWidget *label_entry;
    GtkWidget *display_name_entry;
    GtkWidget *value_entry;
    GtkWidget *compaction_menu;
    GtkWidget *spin;
    GtkWidget *check;
    int varnum;
    int full;
};

static void show_varinfo_changes (int v) 
{
    GtkTreeModel *model;
    GtkTreeIter iter;
    gchar *idstr = NULL;
    int i;

    model = gtk_tree_view_get_model(GTK_TREE_VIEW(mdata->listbox));

    gtk_tree_model_get_iter_first(model, &iter);

    for (i=1; i<datainfo->v; i++) {
      gtk_tree_model_iter_next(model, &iter);
      gtk_tree_model_get(model, &iter, 0, &idstr, -1);
      if (v == atoi(idstr)) {
          break;
      }
      g_free(idstr); 
      idstr = NULL;
    }

    if (idstr != NULL) {
        gtk_tree_store_set(GTK_TREE_STORE(model), &iter, 
                           0, idstr, 
                           1, datainfo->varname[v],
                           2, VARLABEL(datainfo, v),
                           -1);
      g_free(idstr);
    }
}

static char *trim_text (const char *s)
{
    char *ret = NULL;
    int i;

    while (isspace(*s)) s++;
    if (*s == '\0') return NULL;

    ret = g_strdup(s);
    for (i=strlen(ret)-1; i>0; i--) {
      if (!isspace(ret[i])) break;
      ret[i] = '\0';
    }

    return ret;
}

static void 
really_set_variable_info (GtkWidget *w, struct varinfo_settings *vset)
{
    const char *edttext;
    char *newstr = NULL;
    int v = vset->varnum;
    int changed = 0, gui_changed = 0;
    int comp_changed = 0, disc_changed = 0;

    edttext = gtk_entry_get_text(GTK_ENTRY(vset->name_entry));
    newstr = trim_text(edttext);

    if (newstr != NULL && strcmp(datainfo->varname[v], newstr)) {
      if (do_rename_variable(v, newstr, vset->full)) {
          return;
      } else {
          gui_changed = 1;
      }
    }

    free(newstr);

    edttext = gtk_entry_get_text(GTK_ENTRY(vset->label_entry));
    newstr = trim_text(edttext);

    if (newstr != NULL && strcmp(VARLABEL(datainfo, v), newstr)) {
      *VARLABEL(datainfo, v) = 0;
      strncat(VARLABEL(datainfo, v), newstr, MAXLABEL - 1);
      changed = 1;
      gui_changed = 1;
    }

    free(newstr);

    if (vset->display_name_entry != NULL) {
      edttext = gtk_entry_get_text(GTK_ENTRY(vset->display_name_entry));
      newstr = trim_text(edttext);
      if (newstr != NULL && strcmp(DISPLAYNAME(datainfo, v), newstr)) {
          *DISPLAYNAME(datainfo, v) = 0;
          strncat(DISPLAYNAME(datainfo, v), newstr, MAXDISP - 1);
          changed = 1;
      }
      free(newstr);
    }

    if (vset->value_entry != NULL) {
      double val;

      edttext = gtk_entry_get_text(GTK_ENTRY(vset->value_entry));
      if (check_atof(edttext)) {
          errbox(get_gretl_errmsg());
          return;
      } else {
          val = atof(edttext);
          if (val != Z[v][0]) {
            Z[v][0] = val;
            changed = 1;
          }
      }
    }

    if (vset->compaction_menu != NULL) {
      int comp_method = 
          gtk_option_menu_get_history(GTK_OPTION_MENU(vset->compaction_menu));

      if (comp_method != COMPACT_METHOD(datainfo, v)) {
          COMPACT_METHOD(datainfo, v) = comp_method;
          comp_changed = 1;
      }
    }

    if (vset->spin != NULL) {
      int oldlw = var_get_linewidth(datainfo, v);
      int lw = (int) gtk_spin_button_get_value(GTK_SPIN_BUTTON(vset->spin));

      if (lw != oldlw) {
          var_set_linewidth(datainfo, v, lw);
      }
    }

    if (vset->check != NULL) {
      int discrete = 
          gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(vset->check));
      int old = (var_is_discrete(datainfo, v))? 1 : 0;

      if (discrete != old) {
          set_var_discrete(datainfo, v, discrete);
          disc_changed = 1;
      }
    }    

    if (vset->full) {
      if (changed) {
          record_varlabel_change(v);
      }

      if (gui_changed) {
          show_varinfo_changes(v);
      }

      if (changed || comp_changed || gui_changed || disc_changed) {
          data_status |= MODIFIED_DATA;
          set_sample_label(datainfo);
      }
    }

    gtk_widget_destroy(vset->dlg);
}

static void varinfo_cancel (GtkWidget *w, struct varinfo_settings *vset)
{
    if (!vset->full) {
      *datainfo->varname[vset->varnum] = '\0';
    }

    gtk_widget_destroy(vset->dlg);
}

static void free_vsettings (GtkWidget *w, struct varinfo_settings *vset)
{
    free(vset);
}

static const char *comp_int_to_string (int i)
{
    if (i == COMPACT_NONE) return N_("not set");
    if (i == COMPACT_AVG)  return N_("average of observations");
    if (i == COMPACT_SUM)  return N_("sum of observations");
    if (i == COMPACT_SOP)  return N_("first observation");
    if (i == COMPACT_EOP)  return N_("last observation");
    return N_("not set");
}

void varinfo_dialog (int varnum, int full)
{
    GtkWidget *tmp, *hbox;
    struct varinfo_settings *vset;
    unsigned char flags;
    int series = var_is_series(datainfo, varnum);

    vset = mymalloc(sizeof *vset);
    if (vset == NULL) return;

    if (full) {
      flags = GRETL_DLG_BLOCK | GRETL_DLG_RESIZE;
    } else {
      flags = GRETL_DLG_MODAL | GRETL_DLG_BLOCK | GRETL_DLG_RESIZE;
    }

    vset->varnum = varnum;
    vset->dlg = gretl_dialog_new(_("gretl: variable attributes"), NULL, flags);

    vset->display_name_entry = NULL;
    vset->value_entry = NULL;
    vset->compaction_menu = NULL;
    vset->spin = NULL;
    vset->check = NULL;
    vset->full = full;

    g_signal_connect(G_OBJECT(vset->dlg), "destroy", 
                 G_CALLBACK(free_vsettings), vset);

    /* read/set name of variable */
    hbox = gtk_hbox_new(FALSE, 5);
    tmp = gtk_label_new (_("Name of variable:"));
    gtk_box_pack_start(GTK_BOX(hbox), tmp, FALSE, FALSE, 5);
    gtk_widget_show(tmp);

    vset->name_entry = gtk_entry_new();
    gtk_entry_set_max_length(GTK_ENTRY(vset->name_entry), VNAMELEN-1);
    gtk_entry_set_width_chars(GTK_ENTRY(vset->name_entry), VNAMELEN+3);
    gtk_entry_set_text(GTK_ENTRY(vset->name_entry), 
                   datainfo->varname[varnum]);
    gtk_box_pack_start(GTK_BOX(hbox), 
                   vset->name_entry, FALSE, FALSE, 0);
    gtk_entry_set_editable(GTK_ENTRY(vset->name_entry), TRUE);
    gtk_widget_show(vset->name_entry); 
    gtk_entry_set_activates_default(GTK_ENTRY(vset->name_entry), TRUE);

    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(vset->dlg)->vbox), 
                   hbox, FALSE, FALSE, 5);
    gtk_widget_show(hbox); 
    
    /* read/set descriptive string */
    hbox = gtk_hbox_new(FALSE, 5);
    tmp = gtk_label_new (_("Description:"));
    gtk_box_pack_start(GTK_BOX(hbox), tmp, FALSE, FALSE, 5);
    gtk_widget_show(tmp);
    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(vset->dlg)->vbox), 
                   hbox, FALSE, FALSE, 0);
    gtk_widget_show(hbox);

    hbox = gtk_hbox_new(FALSE, 5);
    vset->label_entry = gtk_entry_new();
    gtk_entry_set_max_length(GTK_ENTRY(vset->label_entry), MAXLABEL-1);
    gtk_entry_set_text(GTK_ENTRY(vset->label_entry), 
                   VARLABEL(datainfo, varnum));
    gtk_box_pack_start(GTK_BOX(hbox), vset->label_entry, TRUE, TRUE, 5);
    gtk_widget_show(vset->label_entry);
    gtk_entry_set_activates_default(GTK_ENTRY(vset->label_entry), TRUE);

    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(vset->dlg)->vbox), 
                   hbox, FALSE, FALSE, 5);
    gtk_widget_show(hbox);  

    /* Of editing actions, editing the descriptive string is the most
       likely?  On this assumption we'll focus that widget */
    gtk_widget_grab_focus(vset->label_entry);

    /* set value? (scalars only) */
    if (full && !series) {
      char numstr[32];

      hbox = gtk_hbox_new(FALSE, 5);
      tmp = gtk_label_new (_("Value:"));
      gtk_box_pack_start(GTK_BOX(hbox), tmp, FALSE, FALSE, 5);
      gtk_widget_show(tmp);

      vset->value_entry = gtk_entry_new();
      gtk_entry_set_max_length(GTK_ENTRY(vset->value_entry), 32);
      gtk_entry_set_width_chars(GTK_ENTRY(vset->value_entry), 20);
      sprintf(numstr, "%.16g", Z[varnum][0]);
      gtk_entry_set_text(GTK_ENTRY(vset->value_entry), numstr);
      gtk_box_pack_start(GTK_BOX(hbox), 
                     vset->value_entry, FALSE, FALSE, 5);
      gtk_widget_show(vset->value_entry); 
      gtk_entry_set_activates_default(GTK_ENTRY(vset->value_entry), TRUE);

      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(vset->dlg)->vbox), 
                     hbox, FALSE, FALSE, 5);
      gtk_widget_show(hbox); 
    } 

    /* read/set display name? */
    if (full && series) {
      hbox = gtk_hbox_new(FALSE, 5);
      tmp = gtk_label_new (_("Display name (shown in graphs):"));
      gtk_box_pack_start(GTK_BOX(hbox), tmp, FALSE, FALSE, 5);
      gtk_widget_show(tmp);

      vset->display_name_entry = gtk_entry_new();
      gtk_entry_set_max_length(GTK_ENTRY(vset->display_name_entry), 
                         MAXDISP-1);
      gtk_entry_set_width_chars(GTK_ENTRY(vset->display_name_entry), 
                          MAXDISP+4);
      gtk_entry_set_text(GTK_ENTRY(vset->display_name_entry), 
                     DISPLAYNAME(datainfo, varnum));
      gtk_box_pack_start(GTK_BOX(hbox), 
                     vset->display_name_entry, FALSE, FALSE, 5);
      gtk_widget_show(vset->display_name_entry); 
      gtk_entry_set_activates_default(GTK_ENTRY(vset->display_name_entry), TRUE);

      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(vset->dlg)->vbox), 
                     hbox, FALSE, FALSE, 5);
      gtk_widget_show(hbox); 
    }

    /* read/set compaction method? */
    if (full && series && dataset_is_time_series(datainfo)) {  
      GtkWidget *menu;
      int i;

      hbox = gtk_hbox_new(FALSE, 5);
      tmp = gtk_label_new (_("Compaction method (for reducing frequency):"));
      gtk_box_pack_start(GTK_BOX(hbox), tmp, FALSE, FALSE, 5);
      gtk_widget_show(tmp);

      vset->compaction_menu = gtk_option_menu_new();
      menu = gtk_menu_new();
      for (i=COMPACT_NONE; i<COMPACT_MAX; i++) {
          tmp = gtk_menu_item_new_with_label(_(comp_int_to_string(i)));
          gtk_menu_shell_append(GTK_MENU_SHELL(menu), tmp);
      }
      gtk_option_menu_set_menu(GTK_OPTION_MENU(vset->compaction_menu), menu);
      gtk_option_menu_set_history(GTK_OPTION_MENU(vset->compaction_menu),
                            COMPACT_METHOD(datainfo, varnum));    
      gtk_box_pack_start(GTK_BOX(hbox), 
                     vset->compaction_menu, FALSE, FALSE, 5);
      gtk_widget_show_all(vset->compaction_menu); 

      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(vset->dlg)->vbox), 
                     hbox, FALSE, FALSE, 5);
      gtk_widget_show(hbox); 
    }

    /* graph line width */
    if (full && series && dataset_is_time_series(datainfo)) {  
      int w;

      hbox = gtk_hbox_new(FALSE, 5);
      tmp = gtk_label_new (_("Graph line width:"));
      gtk_box_pack_start(GTK_BOX(hbox), tmp, FALSE, FALSE, 5);
      gtk_widget_show(tmp);

      tmp = gtk_spin_button_new_with_range(1, 8, 1);
      w = var_get_linewidth(datainfo, varnum);
      if (w > 1) {
          gtk_spin_button_set_value(GTK_SPIN_BUTTON(tmp), w);
      }
      gtk_box_pack_start(GTK_BOX(hbox), tmp, FALSE, FALSE, 5);
      gtk_widget_show(tmp);
      vset->spin = tmp;

      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(vset->dlg)->vbox), 
                     hbox, FALSE, FALSE, 5);
      gtk_widget_show(hbox); 
    }    

    /* mark variable as discrete or not? */
    if (full && series && gretl_isdiscrete(0, datainfo->n - 1, Z[varnum])) {
      hbox = gtk_hbox_new(FALSE, 5);
      vset->check = gtk_check_button_new_with_label(_("Treat this variable "
                                          "as discrete"));
      if (var_is_discrete(datainfo, varnum)) {
          gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(vset->check), TRUE);
      }
      gtk_widget_show(vset->check);
      gtk_box_pack_start(GTK_BOX(hbox), vset->check, FALSE, FALSE, 5);
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(vset->dlg)->vbox), 
                     hbox, FALSE, FALSE, 5);
      gtk_widget_show(hbox); 
    }

    hbox = GTK_DIALOG(vset->dlg)->action_area;

    /* Cancel button */
    tmp = cancel_button(hbox);
    g_signal_connect(G_OBJECT (tmp), "clicked", 
                 G_CALLBACK(varinfo_cancel), vset);
    gtk_widget_show(tmp);

    /* "OK" button */
    tmp = ok_button(hbox);
    g_signal_connect(G_OBJECT(tmp), "clicked",
                 G_CALLBACK(really_set_variable_info), vset);
    gtk_widget_grab_default(tmp);
    gtk_widget_show(tmp);

    /* And a Help button? */
    if (full) {
      context_help_button(hbox, SETINFO);
    }

    gtk_widget_show(vset->dlg);
}

static void db_descrip_callback (GtkWidget *w, GtkWidget *dlg)
{
    GtkWidget *entry;
    gchar *fname;

    entry = g_object_get_data(G_OBJECT(dlg), "entry");
    fname = g_object_get_data(G_OBJECT(dlg), "fname");

    if (entry != NULL && fname != NULL) {
      const gchar *newdesc = gtk_entry_get_text(GTK_ENTRY(entry));

      write_db_description(fname, newdesc);
    }
    
    gtk_widget_destroy(dlg);
}

static void free_db_fname (GtkWidget *w, char *fname)
{
    g_free(fname);
}

void database_description_dialog (const char *binname)
{
    GtkWidget *dlg, *entry;
    GtkWidget *tempwid, *hbox;
    gchar *fname, *descrip;

    descrip = get_db_description(binname);
    if (descrip == NULL) {
      return;
    }

    fname = g_strdup(binname);

    dlg = gretl_dialog_new(_("gretl: database description"), NULL,
                     GRETL_DLG_BLOCK | GRETL_DLG_RESIZE);

    hbox = gtk_hbox_new(FALSE, 5);
    tempwid = gtk_label_new (_("description:"));
    gtk_box_pack_start(GTK_BOX(hbox), tempwid, FALSE, FALSE, 0);
    gtk_widget_show(tempwid);

    g_signal_connect(G_OBJECT(dlg), "destroy", 
                 G_CALLBACK(free_db_fname), fname);

    entry = gtk_entry_new();
    gtk_entry_set_max_length(GTK_ENTRY(entry), 64);
    gtk_entry_set_width_chars(GTK_ENTRY(entry), 32);

    gtk_entry_set_text(GTK_ENTRY(entry), descrip);
    gtk_box_pack_start(GTK_BOX(hbox), entry, FALSE, FALSE, 0);
    gtk_entry_set_editable(GTK_ENTRY(entry), TRUE);
    gtk_widget_show(entry); 
    gtk_entry_set_activates_default(GTK_ENTRY(entry), TRUE);

    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dlg)->vbox), 
                   hbox, FALSE, FALSE, 0);
    gtk_widget_show(hbox); 

    /* set data on dialog */
    g_object_set_data(G_OBJECT(dlg), "entry", entry);
    g_object_set_data(G_OBJECT(dlg), "fname", fname);
    
    /* Create the "OK" button */
    tempwid = ok_button(GTK_DIALOG(dlg)->action_area);
    g_signal_connect(G_OBJECT(tempwid), "clicked",
                 G_CALLBACK(db_descrip_callback), dlg);
    gtk_widget_grab_default(tempwid);
    gtk_widget_show(tempwid);

    gretl_set_window_modal(dlg);
    gtk_widget_show(dlg);
}

static void record_seed (GtkWidget *w, guint32 *s)
{
    *s = (guint32) GTK_ADJUSTMENT(w)->value;
}

static void set_rand_seed (GtkWidget *w, guint32 *s)
{
    guint32 newseed = *s;
      
    gretl_command_sprintf("set seed %u", newseed); 
    if (check_and_record_command()) {
      return;
    }

    gretl_rand_set_seed(newseed);
}

void rand_seed_dialog (void)
{
    guint32 dseed = get_gretl_random_seed();
    GtkWidget *dlg;
    GtkWidget *tmp, *hbox;
    GtkObject *adj;

    dlg = gretl_dialog_new(_("gretl: seed for random numbers"), NULL,
                     GRETL_DLG_BLOCK | GRETL_DLG_RESIZE);

    hbox = gtk_hbox_new(FALSE, 5);

    tmp = gtk_label_new(_("Seed for generator:"));
    gtk_box_pack_start(GTK_BOX(hbox), tmp, FALSE, FALSE, 5);

    adj = gtk_adjustment_new((gdouble) dseed, 1, (gdouble) UINT_MAX, 
                       1, 1000, 0);
    g_signal_connect(G_OBJECT(adj), "value-changed",
                 G_CALLBACK(record_seed), &dseed);
    
    tmp = gtk_spin_button_new(GTK_ADJUSTMENT(adj), 1, 0);
    gtk_box_pack_start(GTK_BOX(hbox), tmp, TRUE, TRUE, 5);
    gtk_widget_show_all(hbox);

    /* FIXME activates default */

    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dlg)->vbox), hbox, TRUE, TRUE, 5);

    /* Cancel button */
    cancel_delete_button(GTK_DIALOG(dlg)->action_area, dlg, NULL);
    
    /* OK button */
    tmp = ok_button(GTK_DIALOG(dlg)->action_area);
    g_signal_connect(G_OBJECT(tmp), "clicked",
                 G_CALLBACK(set_rand_seed), &dseed);
    g_signal_connect(G_OBJECT(tmp), "clicked",
                 G_CALLBACK(delete_widget), dlg);
    gtk_widget_grab_default(tmp);
    gtk_widget_show(tmp);

    /* Help button */
    context_help_button(GTK_DIALOG(dlg)->action_area, SEED_RANDOM);

    gtk_widget_show(dlg);
}

/* apparatus for setting sample range */

struct range_setting {
    gretlopt opt;
    GtkWidget *dlg;
    GtkWidget *obslabel;
    GtkObject *adj1;
    GtkWidget *startspin;
    GtkObject *adj2;
    GtkWidget *endspin;
    GtkWidget *combo;
    gpointer p;
    int *t1;
    int *t2;
};

static void free_rsetting (GtkWidget *w, struct range_setting *rset)
{
    free(rset);
}

static gboolean
set_sample_from_dialog (GtkWidget *w, struct range_setting *rset)
{
    int err;

    if (rset->opt & OPT_O) {
      /* sampling using a dummy var */
      const gchar *buf;
      char dumv[VNAMELEN];

      buf = gtk_entry_get_text(GTK_ENTRY(GTK_COMBO(rset->combo)->entry));

      if (sscanf(buf, "%15s", dumv) != 1) {
          return TRUE;
      }

      gretl_command_sprintf("smpl %s --dummy", dumv);
      if (check_and_record_command()) {
          return TRUE;
      }

      err = bool_subsample(rset->opt);
      if (!err) {
          gtk_widget_destroy(rset->dlg);
      } 
    } else if (rset->opt & OPT_N) {
      /* random subsample */
      int subn;

      subn = gtk_spin_button_get_value(GTK_SPIN_BUTTON(rset->startspin));
      gretl_command_sprintf("smpl %d --random", subn);
      if (check_and_record_command()) {
          return TRUE;
      }

      err = bool_subsample(rset->opt);
      if (!err) {
          gtk_widget_destroy(rset->dlg);
      } 
    } else {
      ObsButton *button;
      const gchar *s1, *s2;
      int t1, t2; 

      button = OBS_BUTTON(rset->startspin);
      s1 = gtk_entry_get_text(GTK_ENTRY(button));
      t1 = (int) obs_button_get_value(button);

      button = OBS_BUTTON(rset->endspin);
      s2 = gtk_entry_get_text(GTK_ENTRY(button));
      t2 = (int) obs_button_get_value(button); 

      if (rset->opt & OPT_C) {
          /* creating a new dataset */
          gchar **obsstr = (gchar **) rset->p;

          if (obsstr != NULL) {
            *obsstr = g_strdup_printf("%s %s", s1, s2);
          }
          gtk_widget_destroy(rset->dlg);
          return TRUE;
      } 

      if (t1 != datainfo->t1 || t2 != datainfo->t2) {
          gretl_command_sprintf("smpl %s %s", s1, s2);
          if (check_and_record_command()) {
            return TRUE;
          }
          err = do_set_sample();
          if (err) {
            gui_errmsg(err);
          } else {
            gtk_widget_destroy(rset->dlg);
            set_sample_label(datainfo);
            restore_sample_state(TRUE);
          }
      } else {
          /* no change */
          gtk_widget_destroy(rset->dlg);
      }
    }

    return TRUE;
}

static gboolean
set_obs_from_dialog (GtkWidget *w, struct range_setting *rset)
{
    ObsButton *button;
    const gchar *s;

    if (rset->startspin != NULL && rset->t1 != NULL) {
      button = OBS_BUTTON(rset->startspin);
      s = gtk_entry_get_text(GTK_ENTRY(button));
      *rset->t1 = (int) obs_button_get_value(button);
    }

    if (rset->endspin != NULL && rset->t2 != NULL) {
      button = OBS_BUTTON(rset->endspin);
      s = gtk_entry_get_text(GTK_ENTRY(button));
      *rset->t2 = (int) obs_button_get_value(button); 
    }

    gtk_widget_destroy(rset->dlg);

    return TRUE;
}

static GList *get_dummy_list (int *thisdum)
{
    GList *dumlist = NULL;
    int v = mdata_active_var();
    int i;

    for (i=1; i<datainfo->v; i++) {
      if (var_is_scalar(datainfo, i)) {
          continue;
      }
      if (gretl_isdummy(datainfo->t1, datainfo->t2, Z[i])) {
          dumlist = g_list_append(dumlist, datainfo->varname[i]);
          if (i == v) *thisdum = i;
      }
    }

    return dumlist;
}

gboolean update_obs_label (GtkEditable *entry, gpointer data)
{
    struct range_setting *rset = (struct range_setting *) data;
    char obstext[32];
    int nobs = 0;

    if (entry != NULL) {
      const gchar *vname = gtk_entry_get_text(GTK_ENTRY(entry));

      if (*vname != '\0') {
          int v = varindex(datainfo, vname);

          nobs = gretl_isdummy(0, datainfo->n - 1, Z[v]);
      }
    } else {
      int t1 = (int) obs_button_get_value(OBS_BUTTON(rset->startspin));
      int t2 = (int) obs_button_get_value(OBS_BUTTON(rset->endspin));

      nobs = t2 - t1 + 1;  
    }
    
    if (nobs > 0) {
      sprintf(obstext, _("Observations: %d"), nobs);  
      gtk_label_set_text(GTK_LABEL(rset->obslabel), obstext); 
    }

    return FALSE;
}

static int default_randsize (void)
{
    int n = datainfo->t2 - datainfo->t1 + 1;

    if (n > 1000) {
      return n / 10;
    } else {
      return n / 2;
    }
}

static struct range_setting *rset_new (guint code, gpointer p,
                               int *t1, int *t2,
                               const gchar *title)
{
    struct range_setting *rset;

    rset = mymalloc(sizeof *rset);
    if (rset == NULL) return NULL;

    if (code == SMPLDUM) {
      rset->opt = OPT_O;
    } else if (code == SMPLRAND) {
      rset->opt = OPT_N;
    } else if (code == CREATE_DATASET) {
      rset->opt = OPT_C;
    } else {
      rset->opt = OPT_NONE;
    }

    rset->dlg = gretl_dialog_new(title, NULL, GRETL_DLG_BLOCK);
    rset->combo = NULL;
    rset->adj1 = rset->adj2 = NULL;
    rset->startspin = rset->endspin = NULL;
    rset->obslabel = NULL;

    rset->p = p;

    rset->t1 = t1;
    rset->t2 = t2;

    return rset;
}

typedef enum {
    SPIN_LABEL_NONE,
    SPIN_LABEL_ABOVE,
    SPIN_LABEL_INLINE
} SpinLabelAlign;

static GtkWidget *
obs_spinbox (struct range_setting *rset, const char *label, 
           const char *t1str, const char *t2str,
           int t1min, int t1max, int *t1,
           int t2min, int t2max, int *t2,
           SpinLabelAlign align)
{
    GtkWidget *lbl;
    GtkWidget *vbox;
    GtkWidget *hbox;
    int smin, smaj;

    if (dataset_is_panel(datainfo)) {
      smin = smaj = datainfo->pd;
    } else {
      smin = 1;
      smaj = datainfo->pd;
    }

    if (label != NULL && align == SPIN_LABEL_ABOVE) {
      lbl = gtk_label_new(label);
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(rset->dlg)->vbox), 
                     lbl, FALSE, FALSE, 5);
    }

    if (label != NULL && align == SPIN_LABEL_INLINE) {
      hbox = gtk_hbox_new(FALSE, 5);
      lbl = gtk_label_new(label);
      gtk_box_pack_start(GTK_BOX(hbox), lbl, FALSE, FALSE, 5);
    } else {
      hbox = gtk_hbox_new(TRUE, 5);
    }

    /* spinner for t1 */
    vbox = gtk_vbox_new(FALSE, 5);
    if (t1str != NULL) {
      lbl = gtk_label_new(t1str);
      gtk_box_pack_start(GTK_BOX(vbox), lbl, FALSE, FALSE, 0);
    }
    rset->adj1 = gtk_adjustment_new(*t1, t1min, t1max, smin, smaj, 1);
    rset->startspin = obs_button_new(GTK_ADJUSTMENT(rset->adj1), datainfo);
    gtk_box_pack_start(GTK_BOX(vbox), rset->startspin, FALSE, FALSE, 0);
    gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 5);

    /* spinner for t2, if wanted */
    if (t2 != NULL) {
      vbox = gtk_vbox_new(FALSE, 5);
      if (t2str != NULL) {
          lbl = gtk_label_new(t2str);
          gtk_box_pack_start(GTK_BOX(vbox), lbl, FALSE, FALSE, 0);
      }
      rset->adj2 = gtk_adjustment_new(*t2, t2min, t2max, smin, smaj, 1);
      rset->endspin = obs_button_new(GTK_ADJUSTMENT(rset->adj2), datainfo);
      gtk_box_pack_start(GTK_BOX(vbox), rset->endspin, FALSE, FALSE, 0);
      gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 5);

      /* inter-connect the two spinners */
      g_object_set_data(G_OBJECT(rset->startspin), "endspin", rset->endspin);
      g_object_set_data(G_OBJECT(rset->endspin), "startspin", rset->startspin);
    }

    return hbox;
}

void sample_range_dialog (gpointer p, guint u, GtkWidget *w)
{
    struct range_setting *rset = NULL;
    GList *dumlist = NULL;
    int thisdum = 0;
    GtkWidget *tempwid, *hbox;
    char obstext[32];

    if (u == SMPLDUM) {
      dumlist = get_dummy_list(&thisdum);
      if (dumlist == NULL) {
          if (dataset_is_restricted()) {
            errbox(_("There are no dummy variables in the current sample"));
          } else {
            errbox(_("There are no dummy variables in the dataset"));
          }
          return;
      }
    }

    rset = rset_new(u, p, NULL, NULL, _("gretl: set sample"));
    if (rset == NULL) return;

    if (u == SMPLDUM) {
      tempwid = gtk_label_new(_("Name of dummy variable to use:"));
      hbox = gtk_hbox_new(TRUE, 5);
      gtk_box_pack_start(GTK_BOX(hbox), tempwid, FALSE, FALSE, 5);
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(rset->dlg)->vbox), 
                     hbox, FALSE, FALSE, 5);
      
      rset->combo = gtk_combo_new();
      gtk_combo_set_popdown_strings(GTK_COMBO(rset->combo), dumlist); 
      g_list_free(dumlist);
      if (thisdum > 0) {
          gtk_entry_set_text(GTK_ENTRY(GTK_COMBO(rset->combo)->entry), 
                         datainfo->varname[thisdum]);
      }
      gtk_entry_set_width_chars(GTK_ENTRY(GTK_COMBO(rset->combo)->entry), VNAMELEN-1);
      gtk_editable_set_editable(GTK_EDITABLE(GTK_COMBO(rset->combo)->entry), FALSE);
      g_signal_connect(G_OBJECT(GTK_COMBO(rset->combo)->entry), "changed",
                   G_CALLBACK(update_obs_label), rset);

      hbox = gtk_hbox_new(TRUE, 5);
      gtk_box_pack_start(GTK_BOX(hbox), rset->combo, FALSE, FALSE, 5);
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(rset->dlg)->vbox), 
                     hbox, FALSE, FALSE, 5);
    } else if (u == SMPLRAND) {
      gchar *labtxt;
      GtkObject *adj;

      hbox = gtk_hbox_new(FALSE, 5);

      labtxt = g_strdup_printf(_("Number of observations to select (max %d)"),
                         datainfo->n - 1);

      /* spinner for number of obs */
      tempwid = gtk_label_new(labtxt);
      gtk_box_pack_start(GTK_BOX(hbox), tempwid, FALSE, FALSE, 5);
      adj = gtk_adjustment_new(default_randsize(), 
                         1, datainfo->n - 1,
                         1, 1, 1);
      rset->startspin = gtk_spin_button_new(GTK_ADJUSTMENT(adj), 1, 0);
      gtk_box_pack_start(GTK_BOX(hbox), rset->startspin, FALSE, FALSE, 5);

      /* pack the spinner apparatus */
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(rset->dlg)->vbox), 
                     hbox, FALSE, FALSE, 5);
    } else { 
      /* either plain SMPL or CREATE_DATASET */
      hbox = obs_spinbox(rset, _("Set sample range"), 
                     _("Start:"), _("End:"),
                     0, datainfo->n - 1, &datainfo->t1,
                     0, datainfo->n - 1, &datainfo->t2,
                     SPIN_LABEL_ABOVE);

      /* pack the spinner apparatus */
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(rset->dlg)->vbox), 
                     hbox, FALSE, FALSE, 5);
    }

    if (u != SMPLRAND) {
      /* label showing number of observations */
      sprintf(obstext, _("Observations: %d"), datainfo->t2 - datainfo->t1 + 1);
      rset->obslabel = gtk_label_new(obstext);
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(rset->dlg)->vbox), 
                     rset->obslabel, FALSE, FALSE, 5);
    }

    if (u == SMPL || u == CREATE_DATASET) {
      g_object_set_data(G_OBJECT(rset->startspin), "rset", rset);
      g_object_set_data(G_OBJECT(rset->endspin), "rset", rset);
    }

    if (u == SMPLDUM) {
      update_obs_label(GTK_EDITABLE(GTK_COMBO(rset->combo)->entry),
                   rset);
    }

    /* Cancel button */
    cancel_delete_button(GTK_DIALOG(rset->dlg)->action_area, rset->dlg, NULL);

    /* "OK" button */
    tempwid = ok_button(GTK_DIALOG (rset->dlg)->action_area);
    g_signal_connect(G_OBJECT(tempwid), "clicked",
                 G_CALLBACK(set_sample_from_dialog), rset);
    gtk_widget_grab_default(tempwid);

    g_signal_connect(G_OBJECT(rset->dlg), "destroy", 
                 G_CALLBACK(free_rsetting), rset);

    gtk_widget_show_all(rset->dlg);
}

/* general purpose dialog box for getting from the user either one or
   two observations (e.g. for setting the break point in a Chow test,
   or setting the start and end of a sample range)
*/

int get_obs_dialog (const char *title, const char *text,
                const char *t1str, const char *t2str,
                int t1min, int t1max, int *t1, 
                int t2min, int t2max, int *t2)
{
    GtkWidget *tempwid;
    struct range_setting *rset;
    int ret = 0;

    rset = rset_new(0, NULL, t1, t2, title);
    if (rset == NULL) {
      return -1;
    }

    tempwid = obs_spinbox(rset, text, t1str, t2str, 
                    t1min, t1max, t1, 
                    t2min, t2max, t2,
                    SPIN_LABEL_ABOVE);

    gtk_box_pack_start(GTK_BOX(GTK_DIALOG (rset->dlg)->vbox), 
                   tempwid, TRUE, TRUE, 0);

    /* Cancel button */
    cancel_options_button(GTK_DIALOG(rset->dlg)->action_area, rset->dlg, &ret);

    /* "OK" button */
    tempwid = ok_button(GTK_DIALOG (rset->dlg)->action_area);
    g_signal_connect(G_OBJECT(tempwid), "clicked",
                 G_CALLBACK(set_obs_from_dialog), rset);
    gtk_widget_grab_default(tempwid);

    g_signal_connect(G_OBJECT(rset->dlg), "destroy", 
                 G_CALLBACK(free_rsetting), rset);

    gretl_set_window_modal(rset->dlg);
    gtk_widget_show_all(rset->dlg);

    return ret;
}

static void sync_pre_forecast (GtkWidget *w, struct range_setting *rset)
{
    if (rset->p != NULL) {
      int t1 = (int) obs_button_get_value(OBS_BUTTON(rset->startspin));
      GtkAdjustment *preadj = GTK_ADJUSTMENT(rset->p);

      if (preadj->upper != t1) {
          preadj->upper = t1;
          if (preadj->value > t1) {
            preadj->value = t1;
            gtk_adjustment_value_changed(preadj);
          }
          gtk_adjustment_changed(preadj);
      }
    }
}

int forecast_dialog (int t1min, int t1max, int *t1, 
                 int t2min, int t2max, int *t2,
                 int pmin, int pmax, int *p,
                 int dyn)
{
    const char *pre_txt = N_("Number of pre-forecast observations "
                       "to graph");
    const char *opts[] = {
      N_("automatic forecast (dynamic out of sample)"),
      N_("dynamic forecast"),
      N_("static forecast")
    };
    int nopts = 3;
    int deflt = 0;
    GtkWidget *tmp;
    GtkWidget *hbox;
    GtkWidget *button = NULL;
    struct range_setting *rset;
    int i, ret = 0;

    rset = rset_new(0, NULL, t1, t2, _("gretl: forecast"));
    if (rset == NULL) {
      return -1;
    }

    tmp = obs_spinbox(rset, _("Forecast range:"), 
                  _("Start"), _("End"), 
                  t1min, t1max, t1, 
                  t2min, t2max, t2,
                  SPIN_LABEL_INLINE);

    g_signal_connect(G_OBJECT(rset->adj1), "value-changed",
                 G_CALLBACK(sync_pre_forecast), rset);

    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(rset->dlg)->vbox), 
                   tmp, TRUE, TRUE, 5);

    tmp = gtk_hseparator_new();
    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(rset->dlg)->vbox), 
                   tmp, TRUE, TRUE, 0);
    
    if (dyn == DYNAMIC_NA) {
      deflt = 2;
    } else if (dyn == DYNAMIC_FORCED) {
      deflt = 1;
    }

    /* forecast-type options */
    for (i=0; i<nopts; i++) {
      GSList *group;

      if (button != NULL) {
          group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));
      } else {
          group = NULL;
      }

      hbox = gtk_hbox_new(FALSE, 5);
      button = gtk_radio_button_new_with_label(group, _(opts[i]));
      gtk_box_pack_start(GTK_BOX(hbox), button, FALSE, FALSE, 5);
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(rset->dlg)->vbox), 
                     hbox, TRUE, TRUE, 0);

      if (deflt == i) {
          gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), TRUE);
          ret = i;
      }

      if (dyn != DYNAMIC_OK) {
          gtk_widget_set_sensitive(button, FALSE);
      } else {
          g_signal_connect(G_OBJECT(button), "clicked",
                       G_CALLBACK(set_radio_opt), &ret);
          g_object_set_data(G_OBJECT(button), "action", 
                        GINT_TO_POINTER(i));
      }
    }

    /* pre-forecast obs spinner */
    tmp = gtk_hseparator_new();
    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(rset->dlg)->vbox), 
                   tmp, TRUE, TRUE, 0);
    hbox = gtk_hbox_new(FALSE, 5);
    tmp = option_spinbox(p, _(pre_txt), pmin, pmax, &rset->p);
    gtk_box_pack_start(GTK_BOX(hbox), tmp, FALSE, FALSE, 5);
    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(rset->dlg)->vbox), 
                   hbox, TRUE, TRUE, 5);
    /* get the max pre-forecast obs right */
    gtk_adjustment_value_changed(GTK_ADJUSTMENT(rset->adj1));

    /* Cancel button */
    cancel_options_button(GTK_DIALOG(rset->dlg)->action_area, rset->dlg, &ret);

    /* "OK" button */
    tmp = ok_button(GTK_DIALOG(rset->dlg)->action_area);
    g_signal_connect(G_OBJECT(tmp), "clicked",
                 G_CALLBACK(set_obs_from_dialog), rset);
    gtk_widget_grab_default(tmp);

    g_signal_connect(G_OBJECT(rset->dlg), "destroy", 
                 G_CALLBACK(free_rsetting), rset);

    gretl_set_window_modal(rset->dlg);
    gtk_widget_show_all(rset->dlg);

    return ret;
}

struct add_obs_info {
    GtkWidget *dlg;
    GtkWidget *spin;
    int val;
};

static gboolean set_add_obs (GtkWidget *w, struct add_obs_info *ainfo)
{
    ainfo->val = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(ainfo->spin));
    gtk_widget_destroy(ainfo->dlg);

    return TRUE;
}

int add_obs_dialog (const char *blurb, int addmin)
{
    int panel = dataset_is_panel(datainfo);
    struct add_obs_info ainfo;
    int step, addmax;
    GtkWidget *hbox;
    GtkWidget *tmp;

    if (panel) {
      ainfo.val = datainfo->pd;
      addmin = datainfo->pd;
      step = datainfo->pd;
      addmax = 10 * datainfo->pd;
    } else {
      ainfo.val = 1;
      step = 1;
      addmax = 100;
    }

    ainfo.dlg = gretl_dialog_new(_("Add observations"), NULL,
                         GRETL_DLG_MODAL | GRETL_DLG_BLOCK);

    if (blurb != NULL) {
      hbox = gtk_hbox_new(FALSE, 5);
      tmp = gtk_label_new(blurb);
      gtk_box_pack_start(GTK_BOX(hbox), tmp, TRUE, TRUE, 5);
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(ainfo.dlg)->vbox), 
                     hbox, TRUE, TRUE, 0);
    }

    hbox = gtk_hbox_new(FALSE, 5);
    tmp = gtk_label_new(_("Number of observations to add:"));
    gtk_box_pack_start(GTK_BOX(hbox), tmp, TRUE, TRUE, 5);

    ainfo.spin = gtk_spin_button_new_with_range(addmin, addmax, step);
    gtk_box_pack_start(GTK_BOX(hbox), ainfo.spin, TRUE, TRUE, 5);
    
    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(ainfo.dlg)->vbox), 
                   hbox, TRUE, TRUE, 0);

    /* Cancel button */
    cancel_options_button(GTK_DIALOG(ainfo.dlg)->action_area, ainfo.dlg, 
                    &ainfo.val);

    /* "OK" button */
    tmp = ok_button(GTK_DIALOG(ainfo.dlg)->action_area);
    g_signal_connect(G_OBJECT(tmp), "clicked",
                 G_CALLBACK(set_add_obs), &ainfo);
    gtk_widget_grab_default(tmp);

    gtk_widget_show_all(ainfo.dlg);

    return ainfo.val;
}

static GList *compose_var_selection_list (const int *list)
{
    GList *varlist = NULL;
    int i;

    for (i=1; i<=list[0]; i++) {
      varlist = g_list_append(varlist, datainfo->varname[list[i]]);
    }

    return varlist;
}

static void set_var_from_combo (GtkWidget *w, GtkWidget *dlg)
{
    GtkWidget *combo = g_object_get_data(G_OBJECT(dlg), "combo");
    int *selvar = g_object_get_data(G_OBJECT(dlg), "selvar");
    const char *vname;

    vname = gtk_entry_get_text(GTK_ENTRY(GTK_COMBO(combo)->entry));

    *selvar = varindex(datainfo, vname);
}

int select_var_from_list (const int *list, const char *query)
{
    GtkWidget *tempwid, *hbox;
    GtkWidget *dlg, *combo;
    GList *varlist;
    gchar *title;
    int selvar = -1;

    title = g_strdup_printf("gretl: %s", _("select variable"));
    dlg = gretl_dialog_new(title, NULL, GRETL_DLG_MODAL | GRETL_DLG_BLOCK);
    g_free(title);

    tempwid = gtk_label_new(query);
    hbox = gtk_hbox_new(TRUE, 5);
    gtk_box_pack_start(GTK_BOX(hbox), tempwid, FALSE, FALSE, 5);
    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dlg)->vbox), 
                   hbox, FALSE, FALSE, 5);

    varlist = compose_var_selection_list(list);
    if (varlist == NULL) {
      return -1;
    }
      
    combo = gtk_combo_new();
    gtk_combo_set_popdown_strings(GTK_COMBO(combo), varlist); 
    g_list_free(varlist);

    gtk_entry_set_width_chars(GTK_ENTRY(GTK_COMBO(combo)->entry), VNAMELEN-1);
    gtk_editable_set_editable(GTK_EDITABLE(GTK_COMBO(combo)->entry), FALSE);
    gtk_entry_set_text(GTK_ENTRY(GTK_COMBO(combo)->entry), 
                   datainfo->varname[list[list[0]]]);

    hbox = gtk_hbox_new(TRUE, 5);
    gtk_box_pack_start(GTK_BOX(hbox), combo, FALSE, FALSE, 5);
    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dlg)->vbox), 
                   hbox, FALSE, FALSE, 5);

    g_object_set_data(G_OBJECT(dlg), "combo", combo);
    g_object_set_data(G_OBJECT(dlg), "selvar", &selvar);

    /* Cancel button */
    cancel_delete_button(GTK_DIALOG(dlg)->action_area, dlg, NULL);

    /* "OK" button */
    tempwid = ok_button(GTK_DIALOG(dlg)->action_area);
    g_signal_connect(G_OBJECT(tempwid), "clicked",
                 G_CALLBACK(set_var_from_combo), dlg);
    g_signal_connect(G_OBJECT(tempwid), "clicked",
                 G_CALLBACK(delete_widget), dlg);
    gtk_widget_grab_default(tempwid);

    gtk_widget_show_all(dlg);

    return selvar;
}

/* material relating to the data compaction dialog */

struct compaction_info {
    int *target_pd;
    int *repday;
    GtkWidget *monday_button;
    GtkWidget *sunday_button;
    GtkWidget *wkday_opt;
};

static void abort_compact (GtkWidget *w, gpointer data)
{
    gint *method = (gint *) data;

    *method = COMPACT_NONE;
}

static void set_compact_type (GtkWidget *w, gpointer data)
{
    gint *method = (gint *) data;

    if (GTK_TOGGLE_BUTTON (w)->active) {
        *method = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(w), "action"));
    }
}

static void sensitize_daylist (GtkWidget *w, GtkWidget *c)
{
    if (c != NULL) {
      gtk_widget_set_sensitive(c, GTK_TOGGLE_BUTTON(w)->active);
    }
}

static void set_target_pd (GtkWidget *w, gpointer data)
{
    struct compaction_info *cinfo = data;
    gboolean wtarg;

    if (GTK_TOGGLE_BUTTON(w)->active) {
      *cinfo->target_pd = 
          GPOINTER_TO_INT(g_object_get_data(G_OBJECT(w), "action"));
    }

    wtarg = *cinfo->target_pd == 52;

    if (cinfo->monday_button != NULL) {
      gtk_widget_set_sensitive(cinfo->monday_button, wtarg);
    }
    if (cinfo->sunday_button != NULL) {
      gtk_widget_set_sensitive(cinfo->sunday_button, wtarg);
    }
    if (cinfo->wkday_opt != NULL) {
      GtkWidget *combo = g_object_get_data(G_OBJECT(cinfo->wkday_opt),
                                   "combo");
                                          
      gtk_widget_set_sensitive(cinfo->wkday_opt, wtarg);
      if (combo != NULL) {
          gtk_widget_set_sensitive(cinfo->wkday_opt, wtarg);
      }
    }    
}

static void set_mon_start (GtkWidget *w, gpointer data)
{
    gint *ms = (gint *) data;

    if (GTK_TOGGLE_BUTTON (w)->active) {
        *ms = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(w), "action"));
    }
}

static void pd_buttons (GtkWidget *dlg, int spd, struct compaction_info *cinfo)
{    
    GtkWidget *button;
    GtkWidget *vbox;
    GSList *group;
    gint f1, f2;
    const char *f1str, *f2str;

    if (spd == 12) {
      f1 = 4;
      f2 = 1;
      f1str = N_("Quarterly");
      f2str = N_("Annual");
    } else if (spd == 5 || spd == 7) {
      f1 = 52;
      f2 = 12;
      f1str = N_("Weekly");
      f2str = N_("Monthly");
    } else {
      return;
    }

    vbox = GTK_DIALOG(dlg)->vbox;

    button = gtk_radio_button_new_with_label(NULL, _(f1str));
    gtk_box_pack_start (GTK_BOX(vbox), button, TRUE, TRUE, 0);

    gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), TRUE);

    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_target_pd), cinfo);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER(f1));

    gtk_widget_show (button);

    group = gtk_radio_button_get_group(GTK_RADIO_BUTTON (button));
    button = gtk_radio_button_new_with_label (group, _(f2str));
    gtk_box_pack_start (GTK_BOX(vbox), button, TRUE, TRUE, 0);

    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_target_pd), cinfo);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER(f2));

    gtk_widget_show (button);
}

static void monday_buttons (GtkWidget *dlg, int *mon_start,
                      struct compaction_info *cinfo)
{
    GtkWidget *button;
    GtkWidget *vbox;
    GSList *group;

    vbox = GTK_DIALOG(dlg)->vbox;

    button = gtk_radio_button_new_with_label(NULL, _("Week starts on Monday"));
    cinfo->monday_button = button;
    gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);
    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON (button), TRUE);

    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_mon_start), mon_start);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER(1));

    gtk_widget_show (button);

    group = gtk_radio_button_get_group(GTK_RADIO_BUTTON (button));
    button = gtk_radio_button_new_with_label (group, _("Week starts on Sunday"));
    cinfo->sunday_button = button;
    gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);

    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_mon_start), mon_start);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER(0));

    gtk_widget_show (button);
}

static const char *weekdays[] = {
    N_("Sunday"),
    N_("Monday"),
    N_("Tuesday"),
    N_("Wednesday"),
    N_("Thursday"),
    N_("Friday"),
    N_("Saturday")
};

gboolean select_repday (GtkOptionMenu *menu, int *repday)
{
    int i = gtk_option_menu_get_history(menu);

    *repday = (datainfo->pd == 7)? i : i + 1;

    return FALSE;
}

enum {
    NO_METHODS_SET,
    SOME_METHODS_SET,
    ALL_METHODS_SET
};

static void compact_method_buttons (GtkWidget *dlg, CompactMethod *method,
                            int current_pd, int methods_set,
                            struct compaction_info *cinfo)
{
    GtkWidget *button;
    GtkWidget *vbox;
    GSList *group;

    vbox = GTK_DIALOG(dlg)->vbox;

    if (methods_set == SOME_METHODS_SET) {
      GtkWidget *label;

      label = gtk_label_new(_("Default method:"));
      gtk_box_pack_start(GTK_BOX(vbox), label, TRUE, TRUE, 0);
      gtk_widget_show(label);
    }

    button = gtk_radio_button_new_with_label (NULL, _("Compact by averaging"));
    gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);
    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON (button), TRUE);
    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_compact_type), method);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER(COMPACT_AVG));
    gtk_widget_show(button);

    group = gtk_radio_button_get_group(GTK_RADIO_BUTTON (button));
    button = gtk_radio_button_new_with_label (group, _("Compact by summing"));
    gtk_box_pack_start (GTK_BOX(vbox), button, TRUE, TRUE, 0);
    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_compact_type), method);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER(COMPACT_SUM));
    gtk_widget_show(button);
    if (current_pd == 52) gtk_widget_set_sensitive(button, FALSE);

    group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (button));
    button = gtk_radio_button_new_with_label(group, _("Use end-of-period values"));
    gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);
    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_compact_type), method);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER(COMPACT_EOP));
    gtk_widget_show(button);
    if (current_pd == 52) gtk_widget_set_sensitive(button, FALSE);

    group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (button));
    button = gtk_radio_button_new_with_label(group, _("Use start-of-period values"));
    gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);
    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_compact_type), method);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER(COMPACT_SOP));
    gtk_widget_show(button);
    if (current_pd == 52) gtk_widget_set_sensitive(button, FALSE);

    if (dated_daily_data(datainfo) && cinfo->repday != NULL) {
      GtkWidget *hbox, *daymenu, *menu;
      GtkWidget *tmp;
      int i;

      hbox = gtk_hbox_new(FALSE, 5);
      group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (button));
      button = gtk_radio_button_new_with_label(group, _("Use representative day"));
      gtk_box_pack_start(GTK_BOX(hbox), button, FALSE, FALSE, 0);
      g_signal_connect(G_OBJECT(button), "clicked",
                   G_CALLBACK(set_compact_type), method);
      g_object_set_data(G_OBJECT(button), "action", 
                    GINT_TO_POINTER(COMPACT_WDAY));
      cinfo->wkday_opt = button;

      daymenu = gtk_option_menu_new();
      menu = gtk_menu_new();
      for (i=0; i<7; i++) {
          if ((i == 0 && datainfo->pd != 7) ||
            (i == 6 && datainfo->pd == 5)) {
            continue;
          }
          tmp = gtk_menu_item_new_with_label(_(weekdays[i]));
          gtk_menu_shell_append(GTK_MENU_SHELL(menu), tmp);
      }
      gtk_option_menu_set_menu(GTK_OPTION_MENU(daymenu), menu);
      gtk_box_pack_start(GTK_BOX(hbox), daymenu, FALSE, FALSE, 5);
      g_signal_connect(G_OBJECT(daymenu), "changed",
                   G_CALLBACK(select_repday), cinfo->repday);
      if (*method != COMPACT_WDAY) {
          gtk_widget_set_sensitive(daymenu, FALSE);
      }
      
      g_signal_connect(G_OBJECT(button), "clicked",
                   G_CALLBACK(sensitize_daylist), daymenu);
      g_object_set_data(G_OBJECT(button), "daymenu", daymenu);

      gtk_box_pack_start(GTK_BOX(vbox), hbox, TRUE, TRUE, 0);
      gtk_widget_show_all(hbox);
    }
}

static int compact_methods_set (void)
{
    int i, nmeth = 0;
    int ret = NO_METHODS_SET;

    for (i=1; i<datainfo->v; i++) {
      if (COMPACT_METHOD(datainfo, i) != COMPACT_NONE) {
          nmeth++;
      }
    }

    if (nmeth == datainfo->v - 1) {
      ret = ALL_METHODS_SET;
    } else if (nmeth > 0) {
      ret = SOME_METHODS_SET;
    }

    return ret;
}

void data_compact_dialog (GtkWidget *w, int spd, int *target_pd, 
                    int *mon_start, CompactMethod *method,
                    int *repday)
{
    GtkWidget *d, *tempwid, *hbox;
    int show_pd_buttons = 0;
    int show_monday_buttons = 0;
    int show_method_buttons = 0;
    int methods_set = NO_METHODS_SET;
    struct compaction_info cinfo;
    gchar *labelstr = NULL;

    d = gretl_dialog_new(_("gretl: compact data"), w, GRETL_DLG_BLOCK);

    cinfo.target_pd = target_pd;
    cinfo.repday = repday;
    cinfo.monday_button = NULL;
    cinfo.sunday_button = NULL;
    cinfo.wkday_opt = NULL;

    if (mon_start != NULL) {
      *mon_start = 1;
    }
    
    if (*target_pd != 0) {
      /* importing series from database */
      labelstr = g_strdup_printf(_("You are adding a %s series to %s dataset"),
                           (spd == 4)? _("quarterly") : _("monthly"),
                           (*target_pd == 4)? _("a quarterly"): _("an annual"));
    } else {
      /* compacting whole data set */
      if (spd == 4) {
          *target_pd = 1;
          labelstr = g_strdup(_("Compact quarterly data to annual"));
      } else if (spd == 12) {
          /* source data are monthly */
          labelstr = g_strdup(_("Compact monthly data to:"));
          *target_pd = 4;
          show_pd_buttons = 1;
      } else if (spd >= 5 && spd <= 7) {
          /* source data are daily */
          if (dated_daily_data(datainfo)) {
            labelstr = g_strdup(_("Compact daily data to:"));
            show_pd_buttons = 1;
          } else {
            labelstr = g_strdup(_("Compact daily data to weekly"));
          }
          *target_pd = 52;
          if (mon_start != NULL) {
            show_monday_buttons = 1;
          }
      } else if (dated_weekly_data(datainfo)) {
          labelstr = g_strdup(_("Compact weekly data to monthly"));
          *target_pd = 12;
      }
      methods_set = compact_methods_set();
    }

#if 0
    gtk_box_set_spacing(GTK_BOX(GTK_DIALOG(d)->action_area), 15);
#endif

    tempwid = gtk_label_new(labelstr);
    g_free(labelstr);
    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(d)->vbox), 
                   tempwid, TRUE, TRUE, 0);
    gtk_widget_show(tempwid);

    show_method_buttons = (methods_set != ALL_METHODS_SET);

    /* monthly data: give choice of going to quarterly or annual
       dated daily: choice of going to weekly or monthly */
    if (show_pd_buttons) {
      pd_buttons(d, spd, &cinfo);
      if (show_monday_buttons || show_method_buttons) {
          vbox_add_hsep(GTK_DIALOG(d)->vbox);
      }     
    }

    /* 7-day daily data: give choice of when the week starts */
    if (show_monday_buttons) {
      monday_buttons(d, mon_start, &cinfo);
      if (show_method_buttons) {
          vbox_add_hsep(GTK_DIALOG(d)->vbox);
      }     
    }

    /* per-variable compaction methods not all set already: 
       give choice of default compaction method */
    if (show_method_buttons) {
      compact_method_buttons(d, method, spd, methods_set, &cinfo);
    } 

    hbox = GTK_DIALOG(d)->action_area;

    /* "Cancel" button */
    tempwid = cancel_button(hbox);
    g_signal_connect(G_OBJECT(tempwid), "clicked", 
                 G_CALLBACK(abort_compact), method);
    g_signal_connect (G_OBJECT(tempwid), "clicked", 
                  G_CALLBACK(delete_widget), 
                  G_OBJECT(d));
    gtk_widget_show(tempwid);

    /* "OK" button */
    tempwid = ok_button(hbox);
    g_signal_connect(G_OBJECT(tempwid), "clicked", 
                 G_CALLBACK(delete_widget), 
                 G_OBJECT(d));
    gtk_widget_grab_default(tempwid);
    gtk_widget_show(tempwid);

    /* Create a "Help" button */
    context_help_button(hbox, COMPACT);

    gtk_widget_show(d);
}

static void set_expand_target_pd (GtkWidget *w, gpointer data)
{
    int *targ_pd = (int *) data;

    if (GTK_TOGGLE_BUTTON(w)->active) {
      *targ_pd = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(w), "action"));
    }
}

static void expand_pd_buttons (GtkWidget *dlg, int spd, int *target_pd)
{    
    GtkWidget *button;
    GtkWidget *vbox;
    GSList *group;
    gint f1, f2;
    const char *f1str, *f2str;

    if (spd == 1) {
      f1 = 4;
      f2 = 12;
      f1str = N_("Quarterly");
      f2str = N_("Monthly");
    } else {
      return;
    }

    vbox = GTK_DIALOG(dlg)->vbox;

    button = gtk_radio_button_new_with_label(NULL, _(f1str));
    gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);

    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON (button), TRUE);

    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_expand_target_pd), target_pd);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER(f1));

    gtk_widget_show (button);

    group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));
    button = gtk_radio_button_new_with_label(group, _(f2str));
    gtk_box_pack_start (GTK_BOX(vbox), button, TRUE, TRUE, 0);

    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_expand_target_pd), target_pd);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER(f2));

    gtk_widget_show (button);
}

static void abort_expand (GtkWidget *w, gpointer data)
{
    int *pd = (int *) data;

    *pd = -1;
}

void data_expand_dialog (GtkWidget *w, int spd, int *target_pd)
{
    GtkWidget *d, *tempwid, *hbox;
    int show_pd_buttons = 0;
    gchar *labelstr = NULL;

    d = gretl_dialog_new(_("gretl: expand data"), w, GRETL_DLG_BLOCK);

    if (*target_pd != 0) {
      /* importing series from database */
      labelstr = g_strdup_printf(_("Adding %s series to %s dataset"),
                           (spd == 1)? _("annual") : _("quarterly"),
                           (*target_pd == 4)? _("quarterly"): _("monthly"));
    } else {
      /* expanding whole data set */
      if (spd == 1) {
          labelstr = g_strdup(_("Expand annual data to:"));
          *target_pd = 4;
          show_pd_buttons = 1;
      } else if (spd == 4) {
          /* source data are monthly */
          labelstr = g_strdup(_("Expand quarterly data to monthly"));
          *target_pd = 12;
      }
    }

#if 0
    gtk_box_set_spacing(GTK_BOX(GTK_DIALOG(d)->action_area), 15);
#endif

    tempwid = gtk_label_new(labelstr);
    g_free(labelstr);
    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(d)->vbox), 
                   tempwid, TRUE, TRUE, 0);
    gtk_widget_show(tempwid);

    /* annual data: give choice of going to quarterly or monthly */
    if (show_pd_buttons) {
      expand_pd_buttons(d, spd, target_pd);
    }

    hbox = GTK_DIALOG(d)->action_area;

    /* Cancel button */
    tempwid = cancel_button(hbox);
    g_signal_connect(G_OBJECT(tempwid), "clicked", 
                 G_CALLBACK(abort_expand), target_pd);
    g_signal_connect (G_OBJECT(tempwid), "clicked", 
                  G_CALLBACK(delete_widget), 
                  G_OBJECT(d));
    gtk_widget_show(tempwid);

    /* "OK" button */
    tempwid = ok_button(hbox);
    g_signal_connect(G_OBJECT(tempwid), "clicked", 
                 G_CALLBACK(delete_widget), 
                 G_OBJECT(d));
    gtk_widget_grab_default(tempwid);
    gtk_widget_show(tempwid);

    /* Create a "Help" button */
    context_help_button(hbox, EXPAND);

    gtk_widget_show(d);
}

static void set_radio_opt (GtkWidget *w, int *opt)
{
    *opt = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(w), "action"));
}

int real_radio_dialog (const char *title, const char *label,
                   const char **opts, int nopts, int deflt, int helpcode,
                   int *spinvar, const char *spintxt,
                   int spinmin, int spinmax)
{
    GtkWidget *dialog;
    GtkWidget *tmp;
    GtkWidget *button = NULL;
    GSList *group = NULL;
    int i, ret = -1;

    dialog = gretl_dialog_new(title, NULL, GRETL_DLG_BLOCK);

    if (label != NULL) {
      GtkWidget *hbox = gtk_hbox_new(FALSE, 5);
      
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), 
                     hbox, TRUE, TRUE, 5);
      gtk_widget_show(hbox);

      tmp = gtk_label_new(label);
      gtk_box_pack_start(GTK_BOX(hbox), tmp, TRUE, TRUE, 5);
      gtk_widget_show(tmp);
    }

    for (i=0; i<nopts; i++) {

      if (button != NULL) {
          group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));
      } else {
          group = NULL;
      }

      button = gtk_radio_button_new_with_label(group, _(opts[i]));
      gtk_box_pack_start(GTK_BOX (GTK_DIALOG (dialog)->vbox), 
                     button, TRUE, TRUE, 0);

      if (deflt == i) {
          gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON (button), TRUE);
          ret = i;
      }

      g_signal_connect(G_OBJECT(button), "clicked",
                   G_CALLBACK(set_radio_opt), &ret);
      g_object_set_data(G_OBJECT(button), "action", 
                    GINT_TO_POINTER(i));
      gtk_widget_show(button);
    }

    /* create spinner if wanted */
    if (spinvar != NULL) {
      tmp = option_spinbox(spinvar, spintxt, spinmin, spinmax, NULL);
      gtk_widget_show(tmp);
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), 
                     tmp, TRUE, TRUE, 0);
    }

    /* "Cancel" button */
    cancel_options_button(GTK_DIALOG(dialog)->action_area, dialog, &ret);

    /* "OK" button */
    tmp = ok_button(GTK_DIALOG(dialog)->action_area);
    g_signal_connect(G_OBJECT(tmp), "clicked", 
                 G_CALLBACK(delete_widget), 
                 dialog);
    gtk_widget_grab_default(tmp);
    gtk_widget_show(tmp);

    /* Create a "Help" button? */
    if (helpcode) {
      context_help_button(GTK_DIALOG(dialog)->action_area, helpcode);
    }

    gtk_widget_show(dialog);

    return ret;
}

int radio_dialog (const char *title, const char *label, const char **opts, 
              int nopts, int deflt, int helpcode)
{
    return real_radio_dialog(title, label, opts, nopts, deflt, helpcode,
                       NULL, NULL, 0, 0);
}

int radio_dialog_with_spinner (const char *title, const char **opts, 
                         int nopts, int deflt, int helpcode,
                         int *spinvar, const char *spintxt,
                         int spinmin, int spinmax)
{
    return real_radio_dialog(title, NULL, opts, nopts, deflt, helpcode,
                       spinvar, spintxt, spinmin, spinmax);
}

/* selections in relation to kernel density estimation */

static void bw_set (GtkWidget *w, gpointer p)
{
    double *bw = (double *) p;

    *bw = gtk_spin_button_get_value(GTK_SPIN_BUTTON(w));
}

int density_dialog (int vnum, double *bw)
{
    GtkWidget *dialog;
    GtkWidget *button;
    GtkWidget *hbox;
    GtkWidget *tempwid;
    GSList *group;
    int ret = 0;

    dialog = gretl_dialog_new(_("density estimation options"), NULL,
                        GRETL_DLG_BLOCK);

    /* kernel option buttons */

    button = gtk_radio_button_new_with_label(NULL, _("Gaussian kernel"));
    gtk_box_pack_start (GTK_BOX (GTK_DIALOG(dialog)->vbox), 
                  button, TRUE, TRUE, 0);
    gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), TRUE);

    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_radio_opt), &ret);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER(0));
    gtk_widget_show(button);

    group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (button));
    button = gtk_radio_button_new_with_label(group, _("Epanechnikov kernel"));
    gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog)->vbox), 
                  button, TRUE, TRUE, 0);
    g_signal_connect(G_OBJECT(button), "clicked",
                 G_CALLBACK(set_radio_opt), &ret);
    g_object_set_data(G_OBJECT(button), "action", 
                  GINT_TO_POINTER(1));
    gtk_widget_show(button);

    /* separator */
    vbox_add_hsep(GTK_DIALOG(dialog)->vbox);

    /* bandwidth adjustment */

    hbox = gtk_hbox_new(FALSE, 5);
    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), 
                   hbox, TRUE, TRUE, 5);
    gtk_widget_show(hbox);

    tempwid = gtk_label_new(_("bandwidth adjustment factor:"));
    gtk_box_pack_start(GTK_BOX(hbox), tempwid, TRUE, TRUE, 5);
    gtk_widget_show(tempwid);

    tempwid = gtk_spin_button_new_with_range(0.25, 4.0, .05);
    gtk_spin_button_set_value(GTK_SPIN_BUTTON(tempwid), 1.0);
    g_signal_connect(G_OBJECT(tempwid), "value-changed", 
                 G_CALLBACK(bw_set), 
                 bw); 
    gtk_box_pack_start(GTK_BOX(hbox), tempwid, FALSE, FALSE, 5);
    gtk_widget_show(tempwid);

    /* "Cancel" button */
    cancel_options_button(GTK_DIALOG(dialog)->action_area, dialog, &ret);

    /* "OK" button */
    tempwid = ok_button(GTK_DIALOG(dialog)->action_area);
    g_signal_connect(G_OBJECT(tempwid), "clicked", 
                 G_CALLBACK(delete_widget), 
                 dialog);
    gtk_widget_grab_default (tempwid);
    gtk_widget_show(tempwid);

    /* "Help" button */
    context_help_button(GTK_DIALOG(dialog)->action_area, KERNEL_DENSITY);

    gtk_widget_show(dialog);

    return ret;
}

static void option_spin_set (GtkWidget *w, int *ivar)
{
    *ivar = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(w));
}

static GtkWidget *option_spinbox (int *spinvar, const char *spintxt,
                          int spinmin, int spinmax,
                          gpointer p)
{
    GtkWidget *hbox;
    GtkWidget *label;
    GtkWidget *button;
    GtkObject *adj;

    hbox = gtk_hbox_new(FALSE, 5);

    label = gtk_label_new(spintxt);
    gtk_widget_show(label);
    gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, FALSE, 5);
    adj = gtk_adjustment_new(*spinvar, spinmin, spinmax, 1, 1, 1);
    button = gtk_spin_button_new(GTK_ADJUSTMENT(adj), 1, 0);
    gtk_widget_show(button);
    gtk_box_pack_start(GTK_BOX(hbox), button, FALSE, FALSE, 0);

    g_signal_connect(G_OBJECT(button), "value-changed",
                 G_CALLBACK(option_spin_set), spinvar);

    if (p != NULL) {
      GtkObject **pobj = (GtkObject **) p;

      *pobj = adj;
    }

    g_object_set_data(G_OBJECT(hbox), "spin-button", button);

    return hbox;
}

static void set_checks_opt (GtkWidget *w, int *active)
{
    int i = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(w), "optnum"));

    active[i] = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(w));
}

static void trigger_ok (GtkWidget *w, GtkWidget *b)
{
    gtk_widget_activate(b);
}

/* general purpose dialog offering check-button options and/or
   a spinner with numerical values */

int checks_dialog (const char *title, const char **opts, int nopts,
               int *active, int nradios, int *rvar, int *spinvar, 
               const char *spintxt, int spinmin, int spinmax, 
               int helpcode)
{
    GtkWidget *dialog;
    GtkWidget *tmp, *okb;
    GtkWidget *button = NULL;
    GtkWidget *spin = NULL;
    int i, ret = 0;

    dialog = gretl_dialog_new(title, NULL, GRETL_DLG_BLOCK);

    /* create spinner if wanted */
    if (spinvar != NULL) {
      tmp = option_spinbox(spinvar, spintxt, spinmin, spinmax, NULL);
      gtk_widget_show(tmp);
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG (dialog)->vbox), 
                     tmp, TRUE, TRUE, 5);
      spin = g_object_get_data(G_OBJECT(tmp), "spin-button");
    }

    /* create check buttons, if any */
    for (i=0; i<nopts; i++) {
      button = gtk_check_button_new_with_label(_(opts[i]));
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), 
                     button, TRUE, TRUE, 0);
      if (active[i] > 0) {
          gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), TRUE);
      } else if (active[i] < 0) {
          gtk_widget_set_sensitive(button, FALSE);
      }
      g_signal_connect(G_OBJECT(button), "clicked",
                   G_CALLBACK(set_checks_opt), active);
      g_object_set_data(G_OBJECT(button), "optnum", 
                    GINT_TO_POINTER(i));
      gtk_widget_show(button);
    }

    /* create radio buttons, if any */
    for (i=0; i<nradios; i++) {
      int j = nopts + i;
      GSList *group;

      if (i == 0) {
          group = NULL;
          tmp = gtk_hseparator_new();
          gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), 
                         tmp, TRUE, TRUE, 5);
          gtk_widget_show(tmp);
      } else {
          group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));
      }
      button = gtk_radio_button_new_with_label(group, _(opts[j]));
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), 
                     button, TRUE, TRUE, 0);
      g_signal_connect(G_OBJECT(button), "clicked",
                   G_CALLBACK(set_radio_opt), rvar);
      g_object_set_data(G_OBJECT(button), "action", 
                    GINT_TO_POINTER(i));
      gtk_widget_show(button);
    }

    /* Cancel button */
    cancel_options_button(GTK_DIALOG(dialog)->action_area, dialog, &ret);

    /* "OK" button */
    okb = ok_button(GTK_DIALOG(dialog)->action_area);
    g_signal_connect(G_OBJECT(okb), "clicked", 
                 G_CALLBACK(delete_widget), 
                 dialog);
    gtk_widget_grab_default(okb);
    gtk_widget_show(okb);
    if (spin != NULL) {
      g_signal_connect(G_OBJECT(spin), "activate",
                   G_CALLBACK(trigger_ok), okb);
    }

    /* Create a "Help" button if wanted */
    if (helpcode) {
      context_help_button(GTK_DIALOG(dialog)->action_area, helpcode);
    }

    gtk_widget_show(dialog);

    return ret;
}

int spin_dialog (const char *title, int *spinvar, const char *spintxt, 
             int spinmin, int spinmax, int helpcode)
{
    return checks_dialog(title, NULL, 0, NULL, 0, NULL,
                   spinvar, spintxt,
                   spinmin, spinmax, helpcode);
}

#if defined(G_OS_WIN32)

static void msgbox (const char *msg, int err)
{
    gchar *trmsg = NULL;
    int nls_on = doing_nls();

    if (nls_on) {
      trmsg = my_locale_from_utf8(msg);
      if (trmsg == NULL) {
          return;
      }
    } 

    MessageBox(NULL, (trmsg != NULL)? trmsg : msg, "gretl", 
             MB_OK | ((err)? MB_ICONERROR : MB_ICONINFORMATION));

    if (trmsg != NULL) {
      g_free(trmsg);
    }
}

#else /* gtk 2 native */

static void msgbox (const char *msg, int err)
{
    GtkWidget *dialog;

    dialog = gtk_message_dialog_new (NULL, /* GTK_WINDOW(mdata->w), */
                             GTK_DIALOG_DESTROY_WITH_PARENT,
                             (err)? GTK_MESSAGE_ERROR : GTK_MESSAGE_INFO,
                             GTK_BUTTONS_CLOSE,
                             msg);
    gtk_dialog_run (GTK_DIALOG (dialog));
    gtk_widget_destroy (dialog);
}

#endif /* msgbox variants */

void errbox (const char *template, ...)
{
    char msg[MAXLEN];
    va_list args;

    if (template == NULL) {
      msgbox("Error", 1);
      return;
    }

    va_start(args, template);
    vsprintf(msg, template, args);
    va_end(args);

    msgbox(msg, 1);
}

void infobox (const char *template, ...)
{
    char msg[MAXLEN];
    va_list args;

    va_start(args, template);
    vsprintf(msg, template, args);
    va_end(args);

    msgbox(msg, 0);
}

/* --------------  Dataset structure "wizard" ---------------- */

#define DWDEBUG 0

#define PD_SPECIAL -1

enum {
    DW_SET_TYPE,
    DW_TS_FREQUENCY,
    DW_WEEK_DAYS,
    DW_WEEKLY_SELECT,
    DW_STARTING_OBS,
    DW_PANEL_MODE,
    DW_PANEL_SIZE,
    DW_PANEL_VARS,
    DW_CONFIRM,
    DW_DONE
};

static const char *wizcode_string (int code)
{
    const char *titles[] = {
      N_("Structure of dataset"),
      N_("Time series frequency"),
      N_("Days in week"),
      N_("Daily date to represent week:"),
      N_("Starting observation:"),
      N_("Panel data organization"),
      N_("Number of cross-sectional units:"),
      N_("Panel index variables"),
      N_("Confirm dataset structure:")
    };

    if (code <= DW_CONFIRM) {
      return titles[code];
    } else {
      return "";
    }
}

enum {
    DW_FORWARD = 0,
    DW_BACK    = 1,
    DW_CANCEL = -1
};

static void dwinfo_init (DATAINFO *dwinfo)
{
    dwinfo->pd = datainfo->pd;
    dwinfo->structure = datainfo->structure;

    dwinfo->n = datainfo->n;
    strcpy(dwinfo->stobs, datainfo->stobs);
    strcpy(dwinfo->endobs, datainfo->endobs);
    dwinfo->sd0 = datainfo->sd0;

#if DWDEBUG
    fprintf(stderr, "dwinfo_init:\n"
          " pd=%d, structure=%d, sd0=%g, stobs='%s', endobs='%s'\n",
          dwinfo->pd, dwinfo->structure, dwinfo->sd0,
          dwinfo->stobs, dwinfo->endobs);
#endif
}

/* for the case where the structure wizard is being used
   to create a new dataset */

static void prep_spreadsheet (GtkWidget *widget, dialog_t *dlg) 
{
    const gchar *buf;
    int t;

    buf = edit_dialog_get_text(dlg);

    if (buf == NULL || validate_varname(buf)) {
      return;
    }

    datainfo->varname[1][0] = 0;
    strncat(datainfo->varname[1], buf, VNAMELEN - 1);

    close_dialog(dlg);

    /* blank out the auto "index" variable */
    for (t=0; t<datainfo->n; t++) {
      Z[1][t] = NADBL;
    }
    *(VARLABEL(datainfo, 1)) = 0;

    show_spreadsheet(SHEET_NEW_DATASET);
}

static void maybe_start_editing (void)
{
    int canceled = 0;
    int resp;

    resp = yes_no_dialog(_("gretl: new dataset"), 
                   _("Do you want to start entering data values\n"
                   "using gretl's spreadsheet?"), 0);

    if (resp == GRETL_YES) {
      edit_dialog(_("gretl: name variable"), 
                _("Enter name for first variable\n"
                  "(max. 15 characters)"),
                NULL, prep_spreadsheet, NULL, 
                CREATE_DATASET, VARCLICK_NONE, 
                &canceled);
    } 

    if (resp == GRETL_NO || canceled) {
      /* accept the default blank dataset */
      register_data(NULL, NULL, 0);
    } 
}

/* for balanced panel checking */

static int least_factor (int n)
{
    int flim = n;
    int prime = 1;
    int factor;
    
    if (n % 2 == 0) {
      return 2;
    }

    for (factor = 3; factor < flim; factor += 2) {
      if (n % factor == 0) {
          prime = 0;
          break;
      } else {
          flim = n / factor;
      }
    }

    return (prime)? 1 : factor;
}

static int n_is_prime (void)
{
    int lf = least_factor(datainfo->n);

    return lf == 1;
}

static int test_for_unbalanced (const DATAINFO *dwinfo)
{
    int err = 0;

    if (datainfo->n % dwinfo->t1 != 0) {
      errbox(_("Panel datasets must be balanced.\n"
             "The number of observations (%d) is not a multiple\n"
             "of the number of %s (%d)."), datainfo->n,
             _("units"), dwinfo->t1);
      err = 1;
    }

    return err;
}

static void maybe_unrestrict_dataset (void)
{
    if (complex_subsampled()) {
      maybe_free_full_dataset(datainfo);
      if (datainfo->t1 == 0 && 
          datainfo->t2 == datainfo->n - 1) {
          restore_sample_state(FALSE);
      }
    }
}

static int
datawiz_make_changes (DATAINFO *dwinfo, int create)
{
    char setline[32];
    gretlopt opt = OPT_NONE;
    int delete_markers = 0;
    int err = 0;

    /* preliminaries */
    if (dwinfo->structure == TIME_SERIES || 
      dwinfo->structure == SPECIAL_TIME_SERIES) {
      ntodate_full(dwinfo->stobs, dwinfo->t1, dwinfo);
    } else if (dataset_is_panel(dwinfo)) {
      if (test_for_unbalanced(dwinfo)) {
          return 1;
      }
      if (!dataset_is_panel(datainfo)) {
          /* Turning a subset of a non-panel dataset into a panel:
             this change will be irreversible */
          maybe_unrestrict_dataset();
      }
    }

    /* special: reorganizing dataset based on panel index vars */
    if (dwinfo->structure == PANEL_UNKNOWN) {
      err = set_panel_structure_from_vars(dwinfo->t1, dwinfo->t2,
                                  Z, datainfo);
      goto finalize;
    }

    /* check for nothing to be done */
    if (dwinfo->structure == datainfo->structure &&
      dwinfo->pd == datainfo->pd &&
      strcmp(dwinfo->stobs, datainfo->stobs) == 0) {
      if (create) {
          goto finalize;
      } else {
          infobox(_("No changes were made"));
          return 0;
      }
    }

    /* if converting to time series, we probably don't want to
       retain any original observation-marker strings */
    if (dwinfo->structure == TIME_SERIES && datainfo->markers) {
      delete_markers = 1;
    }

    /* handle panel structure */
    if (dataset_is_panel(dwinfo)) {
      int nunits = dwinfo->t1;
      int nperiods = datainfo->n / nunits;

      /* we don't offer a choice of "starting obs" */
      dwinfo->pd = (dwinfo->structure == STACKED_TIME_SERIES)? 
          nperiods : nunits;
      strcpy(dwinfo->stobs, "1.1");
    } 

    /* handle conversion to cross-section */
    if (dwinfo->structure == CROSS_SECTION) {
      strcpy(dwinfo->stobs, "1");
    }

    sprintf(setline, "setobs %d %s", dwinfo->pd, dwinfo->stobs);

    if (dwinfo->structure == TIME_SERIES) {
      opt = OPT_T;
    } else if (dwinfo->structure == STACKED_TIME_SERIES) {
      opt = OPT_S;
    } else if (dwinfo->structure == STACKED_CROSS_SECTION) {
      opt = OPT_C;
    } else if (dwinfo->structure == CROSS_SECTION) {
      opt = OPT_X;
    } else if (dwinfo->structure == SPECIAL_TIME_SERIES) {
      opt = OPT_N;
    }

#if DWDEBUG
    fprintf(stderr, "setline = '%s', opt = %ld\n", setline, opt);
#endif

    err = set_obs(setline, NULL, datainfo, opt);

 finalize:

    if (err) {
      errbox(get_gretl_errmsg());
    } else if (create) {
      if (datainfo->n < 1001) {
          maybe_start_editing();
      } else {
          register_data(NULL, NULL, 0);
      }
    } else {
      if (delete_markers) {
          dataset_destroy_obs_markers(datainfo);
      }
      mark_dataset_as_modified();
    }

    return err;
}

#define TS_INFO_MAX 8
#define PANEL_INFO_MAX 3

struct freq_info {
    int pd;
    const char *label;
};

struct freq_info ts_info[] = {
    {  1, N_("Annual") },
    {  4, N_("Quarterly") },
    { 12, N_("Monthly") },
    { 52, N_("Weekly") },
    {  5, N_("Daily") },
    { 24, N_("Hourly") },
    { 10, N_("Decennial") },
    { PD_SPECIAL, N_("Other") },
};

struct panel_info {
    int code;
    const char *label;
};

struct panel_info pan_info[] = {
    { STACKED_TIME_SERIES,   N_("Stacked time series") },
    { STACKED_CROSS_SECTION, N_("Stacked cross sections") },
    { PANEL_UNKNOWN,         N_("Use index variables") }
};

static int radio_default (DATAINFO *dwinfo, int code)
{
    int deflt = 1;

#if DWDEBUG
    fprintf(stderr, "radio_default: code=%d, dwinfo->pd=%d, dwinfo->structure=%d\n", 
          code, dwinfo->pd, dwinfo->structure);
#endif

    if (code == DW_SET_TYPE) {
      deflt = dwinfo->structure;
    } else if (code == DW_TS_FREQUENCY) {
      if (dwinfo->structure == SPECIAL_TIME_SERIES) {
          deflt = PD_SPECIAL;
      } else if (dwinfo->pd == 6 || dwinfo->pd == 7) {
          deflt = 5;
      } else if (dwinfo->pd == 5 || dwinfo->pd == 4 || dwinfo->pd == 10 ||
               dwinfo->pd == 12 || dwinfo->pd == 52) {
          deflt = dwinfo->pd;
      } 
    } else if (code == DW_WEEK_DAYS) {
      deflt = dwinfo->pd; 
    } else if (code == DW_WEEKLY_SELECT) {
      deflt = dwinfo->v;
    } else if (code == DW_PANEL_MODE) { 
      deflt = dwinfo->structure;
    }

#if DWDEBUG
    fprintf(stderr, " returning deflt = %d\n", deflt);
#endif

    return deflt;
}

static int datawiz_i_to_setval (DATAINFO *dwinfo, int step, int i)
{
    int setval;

    if (step == DW_SET_TYPE && 
      dwinfo->structure == SPECIAL_TIME_SERIES &&
      i == TIME_SERIES) {
      setval = SPECIAL_TIME_SERIES;
    } else if (step == DW_TS_FREQUENCY) {
      setval = (i < TS_INFO_MAX)? ts_info[i].pd : 0;
    } else if (step == DW_WEEK_DAYS) {
      setval = i + 5;
    } else if (step == DW_PANEL_MODE) {
      setval = (i < PANEL_INFO_MAX)? pan_info[i].code : 0;
    } else {
      setval = i;
    }

    return setval;
}

static const char *datawiz_radio_strings (int wizcode, int i)
{
    if (wizcode == DW_SET_TYPE) {
      if (i == 0) return N_("Cross-sectional");
      if (i == 1) return N_("Time series");
      if (i == 2) return N_("Panel");
    } else if (wizcode == DW_WEEK_DAYS) {
      if (i == 0) return N_("5 days in week");
      if (i == 1) return N_("6 days in week");
      if (i == 2) return N_("7 days in week");
    } else if (wizcode == DW_WEEKLY_SELECT) {
      if (i == 0) return N_("Monday");
      if (i == 1) return N_("Tuesday");
      if (i == 2) return N_("Wednesday");
      if (i == 3) return N_("Thursday");
      if (i == 4) return N_("Friday");
      if (i == 5) return N_("Saturday");
      if (i == 6) return N_("Sunday");
      if (i == 7) return N_("None (don't use dates)");
    } else if (wizcode == DW_TS_FREQUENCY) {
      return ts_info[i].label;
    } else if (wizcode == DW_PANEL_MODE) {
      return pan_info[i].label;
    }

    return "";
}  

struct setvar_and_spin {
    int *setvar;
    int *extra;
    GtkWidget *spinner;
};

static void datawiz_set_radio_opt (GtkWidget *w, struct setvar_and_spin *sspin)
{
    int val = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(w), "action"));

    if (sspin->spinner != NULL) {
      if (val == PD_SPECIAL) {
          GtkAdjustment *adj = 
            gtk_spin_button_get_adjustment(GTK_SPIN_BUTTON(sspin->spinner));

          gtk_widget_set_sensitive(sspin->spinner, TRUE);
          val = (int) adj->value;
          if (sspin->extra != NULL) {
            *sspin->extra = SPECIAL_TIME_SERIES;
          }
      } else {
          gtk_widget_set_sensitive(sspin->spinner, FALSE);
          if (sspin->extra != NULL) {
            *sspin->extra = TIME_SERIES;
          }
      }
    }

#if DWDEBUG
    fprintf(stderr, "datawiz_set_radio_opt: setting setvar to %d\n", val);
    if (sspin->extra != NULL) {
      fprintf(stderr, "datawiz_set_radio_opt: extra now = %d\n", *sspin->extra);
    }
#endif

    *sspin->setvar = val;
}

static void set_back_code (GtkWidget *w, int *ret)
{
    *ret = DW_BACK;
}

struct ts_pd {
    int pd;
    const char *label;
};

static void make_confirmation_text (char *ctxt, DATAINFO *dwinfo)
{
    struct ts_pd ok_pd[] = {
      {  1, N_("Annual") },
      {  4, N_("Quarterly") },
      { 12, N_("Monthly") },
      { 52, N_("Weekly") },
      {  5, N_("Daily") },
      {  6, N_("Daily") },
      {  7, N_("Daily") },
      { 24, N_("Hourly") },
      { 10, N_("Decennial") },
      {  0, NULL }
    };

    if (dwinfo->structure == CROSS_SECTION) {
      sprintf(ctxt, _("%s, observations 1 to %d"), _("cross-sectional data"), 
            datainfo->n);
    } else if (dwinfo->structure == TIME_SERIES || 
             dwinfo->structure == SPECIAL_TIME_SERIES) {
      int lastobs = dwinfo->t1 + datainfo->n - 1;
      char stobs[OBSLEN];
      char endobs[OBSLEN];
      const char *tslabel = N_("time-series data");
      int i;

      if (dwinfo->structure == TIME_SERIES) {
          for (i=0; ok_pd[i].pd != 0; i++) { 
            if (dwinfo->pd == ok_pd[i].pd) {
                tslabel = _(ok_pd[i].label);
                break;
            }
          } 
      }

      if (lastobs > dwinfo->n - 1) {
          dwinfo->n = lastobs + 1;
      }

      ntodate_full(stobs, dwinfo->t1, dwinfo);
      ntodate_full(endobs, lastobs, dwinfo);
      sprintf(ctxt, _("%s, %s to %s"), tslabel, stobs, endobs);
    } else if (dwinfo->structure == PANEL_UNKNOWN) {
      sprintf(ctxt, _("panel data (%s)\n"
                  "%d cross-sectional units observed over %d periods"),
            _("stacked time series"), dwinfo->n, dwinfo->pd);
    } else if (dataset_is_panel(dwinfo)) {
      int nunits = dwinfo->t1;
      int nperiods = datainfo->n / nunits;

      sprintf(ctxt, _("panel data (%s)\n"
                  "%d cross-sectional units observed over %d periods"),
            (dwinfo->structure == STACKED_TIME_SERIES)? 
            _("stacked time series") : _("stacked cross sections"),
            nunits, nperiods);
    } 
}

static void make_weekly_stobs (DATAINFO *dwinfo)
{
    int start_days[] = { 6, 7, 1, 2, 3, 4, 5 };

    sprintf(dwinfo->stobs, "1800/01/0%d", start_days[dwinfo->v]);    
}

static int default_start_decade (void)
{
    int d = 1700;

    if (datainfo->S != NULL) {
      d = positive_int_from_string(datainfo->S[0]);
    }
    
    if (d < 0) {
      d = 1700;
    }

    return d;
}

void compute_default_ts_info (DATAINFO *dwinfo, int newdata)
{
#if DWDEBUG
    char obsstr[OBSLEN];

    fprintf(stderr, "compute_ts_info() called: pd=%d, structure=%d\n",
          dwinfo->pd, dwinfo->structure);
    if (dwinfo->pd == PD_SPECIAL) {
      fprintf(stderr, "breakage: pd = PD_SPECIAL\n");
    }
#endif

    if (dwinfo->pd < 0) {
      dwinfo->pd = 1;
    }
    
    if (dwinfo->structure == CROSS_SECTION) {
      dwinfo->n = 500;
      dwinfo->t1 = 0;
      strcpy(dwinfo->stobs, "1");
    } else if (dwinfo->structure == SPECIAL_TIME_SERIES) {
      dwinfo->n = 500;
      dwinfo->t1 = 0;
      if (dwinfo->pd > 1) {
          int p = dwinfo->pd;

          strcpy(dwinfo->stobs, "1:");
          while ((p = p / 10) > 0) {
            strcat(dwinfo->stobs, "0");
          }
          strcat(dwinfo->stobs, "1");
      } else {
          strcpy(dwinfo->stobs, "1");
      }
    } else if (dwinfo->pd == 1) {
      strcpy(dwinfo->stobs, "1700");
      dwinfo->n = 400;
      dwinfo->t1 = 250;
    } else if (dwinfo->pd == 10) {
      int dd = default_start_decade();

      sprintf(dwinfo->stobs, "%d", dd);
      if (dd > 1700) {
          dwinfo->n = 30;
          dwinfo->t1 = 0;
      } else {
          dwinfo->n = 40;
          dwinfo->t1 = 25;
      }
    } else if (dwinfo->pd == 4) {
      strcpy(dwinfo->stobs, "1700:1");
      dwinfo->n = 1300;
      dwinfo->t1 = 1000;
    } else if (dwinfo->pd == 12) {
      strcpy(dwinfo->stobs, "1700:01");
      dwinfo->n = 3900;
      dwinfo->t1 = 3360;
    } else if (dwinfo->pd == 24) {
      strcpy(dwinfo->stobs, "1:01");
      dwinfo->n = 1500;
      dwinfo->t1 = 0;
    } else if (dwinfo->pd == 52) {
      if (dwinfo->v >= 7) {
          dwinfo->n = 500;
          dwinfo->t1 = 0;
          strcpy(dwinfo->stobs, "1");
      } else {
          make_weekly_stobs(dwinfo);
          dwinfo->n = 13000;
          dwinfo->t1 = 7826;
      }
    } else if (dwinfo->pd == 5 ||
             dwinfo->pd == 6 ||
             dwinfo->pd == 7) {
      strcpy(dwinfo->stobs, "1900/01/01");
      dwinfo->n = 40000;
      if (dwinfo->pd == 5) {
          dwinfo->t1 = 13046;
      } else if (dwinfo->pd == 6) {
          dwinfo->t1 = 15654;
      } else {
          dwinfo->t1 = 18263;
      }
    }

    if (newdata) {
      dwinfo->t2 = dwinfo->t1 + 49;
    } else if (datainfo->structure == TIME_SERIES && 
             datainfo->pd == dwinfo->pd) {
      /* make the current start the default */
      dwinfo->t1 = dateton(datainfo->stobs, dwinfo);
    }

    dwinfo->sd0 = get_date_x(dwinfo->pd, dwinfo->stobs);
    ntodate_full(dwinfo->endobs, dwinfo->n - 1, dwinfo);

#if DWDEBUG
    ntodate_full(obsstr, dwinfo->t1, dwinfo);
    fprintf(stderr, "dwinfo: v=%d, pd=%d, stobs='%s', endobs='%s', sd0=%g, t1=%d (%s)\n",
          dwinfo->v, dwinfo->pd, dwinfo->stobs, dwinfo->endobs, dwinfo->sd0, 
          dwinfo->t1, obsstr);

    ntodate_full(obsstr, datainfo->t1, datainfo);
    fprintf(stderr, "datainfo: pd=%d, stobs='%s', sd0=%g, t1=%d (%s)\n",
          datainfo->pd, datainfo->stobs, datainfo->sd0, datainfo->t1, obsstr);
#endif
}

int default_panel_size (DATAINFO *dwinfo, int smin)
{
    int sz = 1;

    if (dwinfo->pd > 1) {
      if (dwinfo->structure == STACKED_TIME_SERIES) {
          sz = dwinfo->n / dwinfo->pd;
      } else {
          sz = dwinfo->pd;
      }
    } else {
      sz = smin;
    }

    return sz;
}

static void dw_set_custom_frequency (GtkWidget *w, DATAINFO *dwinfo)
{
    dwinfo->pd = (int) GTK_ADJUSTMENT(w)->value;
#if DWDEBUG
    fprintf(stderr, "dw_set_custom_frequency: set dwinfo->pd = %d\n", dwinfo->pd);
#endif
}

static void dw_set_t1 (GtkWidget *w, DATAINFO *dwinfo)
{
    /* in case of panel data, "t1" is borrowed to represent the
       number of cross-sectional units
    */
    dwinfo->t1 = (int) GTK_ADJUSTMENT(w)->value;
#if DWDEBUG
    fprintf(stderr, "dw_set_t1: set 'dwinfo->t1' = %d\n", dwinfo->t1);
#endif
}

static int process_panel_vars (DATAINFO *dwinfo)
{
    int n = datainfo->n;
    double *uid = NULL;
    double *tid = NULL;
    int uv, tv;
    int nunits = 0;
    int nperiods = 0;
    int err = 0;

    /* FIXME sub-sampled dataset? */

    uv = dwinfo->t1;
    tv = dwinfo->t2;

    if (uv == tv) {
      errbox(_("The unit and time index variables must be distinct"));
      return E_DATA;
    }

    uid = copyvec(Z[uv], n);
    tid = copyvec(Z[tv], n);

    if (uid == NULL || tid == NULL) {
      nomem();
      err = E_ALLOC;
    }

    if (!err) {
      qsort(uid, n, sizeof *uid, gretl_compare_doubles);
      nunits = count_distinct_values(uid, n);

      qsort(tid, n, sizeof *tid, gretl_compare_doubles);
      nperiods = count_distinct_values(tid, n);

      if (nunits == 1 || nperiods == 1 || 
          nunits == n || nperiods == n ||
          n > nunits * nperiods) {
          errbox(_("The selected index variables do not represent "
                 "a panel structure"));
          err = E_DATA;
      } else {
          dwinfo->n = nunits; 
          dwinfo->pd = nperiods;
      }
    }

    free(uid);
    free(tid);

    return err;
}

/* try to assemble a list of at least two potential panel index
   variables: return NULL if this can't be done */

static GList *panelvars_list (void)
{
    GList *vlist = NULL;
    int i, t, ok;

    for (i=1; i<datainfo->v; i++) {
      if (var_is_scalar(datainfo, i)) {
          continue;
      }
      ok = 1;
      for (t=datainfo->t1; t<=datainfo->t2; t++) {
          if (na(Z[i][t]) || Z[i][t] <= 0.0) {
            ok = 0;
            break;
          }
      }
      if (ok) {
         vlist = g_list_append(vlist, datainfo->varname[i]); 
      }
    }

    if (vlist != NULL && g_list_length(vlist) < 2) {
      g_list_free(vlist);
      vlist = NULL;
    }

    return vlist;
}

static gboolean update_panel_var (GtkEditable *entry, DATAINFO *dwinfo)
{
    const gchar *vname = gtk_entry_get_text(GTK_ENTRY(entry));
    int i = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(entry), "index"));
    int v = varindex(datainfo, vname);

    /* note: borrowing t1, t2 here to record index var IDs */

    if (i == 0) {
      dwinfo->t1 = v;
    } else {
      dwinfo->t2 = v;
    }

    return FALSE;
}

static 
void panelvar_candidates (GList *vlist, char *uname, char *tname)
{
    GList *mylist = vlist;
    const char *vname;
    char vtest[VNAMELEN];

    *uname = '\0';
    *tname = '\0';

    while (mylist != NULL) {
      vname = (const char *) mylist->data;
      strcpy(vtest, vname);
      lower(vtest);
      if (!strcmp(vtest, "time") || 
          !strcmp(vtest, "year") ||
          !strcmp(vtest, "period")) {
          strcpy(tname, vname);
      } else if (!strcmp(vtest, "unit") ||
               !strcmp(vtest, "group")) {
          strcpy(uname, vname);
      }
      mylist = g_list_next(mylist);
    }
}

static void 
maybe_set_panelvar (GtkEntry *entry, GList *vlist,
                char *uname, char *tname, int i)
{
    if (i == 0) {
      if (*uname != '\0') {
          gtk_entry_set_text(entry, uname);
      } else {
          strcpy(uname, (char *) vlist->data);
      }
    } else {
      if (*tname != '\0') {
          gtk_entry_set_text(entry, tname);
      } else {        
          GList *mylist = vlist;

          while (mylist != NULL) {
            if (strcmp(uname, (char *) mylist->data)) {
                gtk_entry_set_text(entry, mylist->data);
                break;
            }
            mylist = g_list_next(mylist);
          }
      }
    }
}

static GtkWidget *dwiz_combo (GList *vlist, DATAINFO *dwinfo)
{
    const char *strs[] = {
      N_("Unit or group index variable:"),
      N_("Time index variable:")
    };
    GtkWidget *w;
    GtkWidget *table;
    GtkWidget *combo;
    char uname[VNAMELEN];
    char tname[VNAMELEN];
    int i;

    panelvar_candidates(vlist, uname, tname);

    table = gtk_table_new(2, 2, FALSE);
    gtk_table_set_col_spacings(GTK_TABLE(table), 5);
    gtk_table_set_row_spacings(GTK_TABLE(table), 5);

    for (i=0; i<2; i++) {
      w = gtk_label_new(_(strs[i]));
      gtk_table_attach_defaults(GTK_TABLE(table), w, 0, 1, i, i+1);

      combo = gtk_combo_new();
      gtk_table_attach_defaults(GTK_TABLE(table), combo, 1, 2, i, i+1);

      gtk_entry_set_width_chars(GTK_ENTRY(GTK_COMBO(combo)->entry), 15);
      gtk_editable_set_editable(GTK_EDITABLE(GTK_COMBO(combo)->entry), FALSE);
      gtk_combo_set_popdown_strings(GTK_COMBO(combo), vlist); 
      g_object_set_data(G_OBJECT(GTK_COMBO(combo)->entry), "index",
                    GINT_TO_POINTER(i));
      g_signal_connect(G_OBJECT(GTK_COMBO(combo)->entry), "destroy",
                   G_CALLBACK(update_panel_var), dwinfo);
      maybe_set_panelvar(GTK_ENTRY(GTK_COMBO(combo)->entry), vlist,
                     uname, tname, i);
    }

    return table;
}

static GtkWidget *dwiz_spinner (GtkWidget *hbox, DATAINFO *dwinfo, int step)
{
    GtkObject *adj;
    GtkWidget *label;
    GtkWidget *dwspin;
    int spinmin, spinmax, spinstart;

    if (step != DW_TS_FREQUENCY) {
      label = gtk_label_new(_(wizcode_string(step)));
      gtk_widget_show(label);
      gtk_box_pack_start(GTK_BOX(hbox), label, TRUE, FALSE, 0);
    }

    if (step == DW_STARTING_OBS && 
      (dwinfo->structure == TIME_SERIES || 
       dwinfo->structure == SPECIAL_TIME_SERIES)) {
      compute_default_ts_info(dwinfo, 0);
      spinmin = 0;
      spinmax = dwinfo->n - 1;
      spinstart = dwinfo->t1;
    } else if (step == DW_TS_FREQUENCY) {
      spinmin = 1;
      spinmax = 100; /* arbitrary */
      spinstart = dwinfo->pd;
    } else if (step == DW_PANEL_SIZE) {
      spinmin = least_factor(datainfo->n);
      spinmax = datainfo->n / 2;
      spinstart = default_panel_size(dwinfo, spinmin);
    } else {
      /* should be impossible */
      return NULL;
    }

    /* appropriate step size? */
    adj = gtk_adjustment_new(spinstart, spinmin, spinmax,
                       1, 10, 1);
    if (step == DW_TS_FREQUENCY) {
      g_signal_connect(G_OBJECT(adj), "value-changed", 
                   G_CALLBACK(dw_set_custom_frequency), dwinfo);
    } else {
      g_signal_connect(G_OBJECT(adj), "value-changed", 
                   G_CALLBACK(dw_set_t1), dwinfo);
    }

    if (step == DW_STARTING_OBS) {
      dwspin = obs_button_new(GTK_ADJUSTMENT(adj), dwinfo);
    } else {
      dwspin = gtk_spin_button_new(GTK_ADJUSTMENT(adj), 1, 0);
    }

    gtk_entry_set_activates_default(GTK_ENTRY(dwspin), TRUE);

    gtk_box_pack_start(GTK_BOX(hbox), dwspin, (step != DW_TS_FREQUENCY), FALSE, 0);
    gtk_widget_show(dwspin);

    return dwspin;
}

static void reactivate_main_menus (GtkWidget *w, gpointer p)
{
    main_menus_enable(TRUE);
}

static int datawiz_dialog (int step, DATAINFO *dwinfo)
{
    struct setvar_and_spin sspin;
    GtkWidget *dialog;
    GtkWidget *tempwid;
    GtkWidget *button = NULL;
    GSList *group = NULL;
    GList *vlist = NULL;
    int nopts = 0;
    int setval = 0;
    int prime = 0;
    int i, deflt, ret = DW_FORWARD;

#if DWDEBUG
    fprintf(stderr, "\n*** datawiz_dialog: step = %d\n", step);
#endif

    deflt = radio_default(dwinfo, step);

    if (step == DW_CONFIRM && dataset_is_panel(dwinfo) &&
      test_for_unbalanced(dwinfo)) {
      return DW_BACK;
    }

    if (step == DW_PANEL_VARS) {
      vlist = panelvars_list();
      if (vlist == NULL) {
          errbox(_("The data set contains no suitable index variables"));
          return DW_BACK;
      }
    }

    dialog = gretl_dialog_new(_("Data structure wizard"), NULL,
                        GRETL_DLG_BLOCK);

    g_signal_connect(G_OBJECT(dialog), "destroy", 
                 G_CALLBACK(reactivate_main_menus), NULL);

    sspin.setvar = NULL;
    sspin.extra = NULL;
    sspin.spinner = NULL;

    if (step == DW_SET_TYPE) {
      nopts = 3;
      sspin.setvar = &dwinfo->structure;
    } else if (step == DW_TS_FREQUENCY) {
      nopts = TS_INFO_MAX;
      sspin.setvar = &dwinfo->pd;
      sspin.extra = &dwinfo->structure;
    } else if (step == DW_WEEK_DAYS) {
      nopts = 3;
      sspin.setvar = &dwinfo->pd;
    } else if (step == DW_WEEKLY_SELECT) {
      nopts = 8;
      sspin.setvar = &dwinfo->v;
    } else if (step == DW_PANEL_MODE) {
      nopts = PANEL_INFO_MAX;
      sspin.setvar = &dwinfo->structure;
      prime = n_is_prime();
    } else if (step == DW_PANEL_SIZE) {
      sspin.setvar = &dwinfo->pd;
    } 

    /* top label */
    if (step != DW_STARTING_OBS && step != DW_PANEL_SIZE) {
      tempwid = gtk_label_new(_(wizcode_string(step)));
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), 
                     tempwid, TRUE, TRUE, 5);
      gtk_widget_show(tempwid);
    }

    /* radio options? */
    for (i=0; i<nopts; i++) {
      GtkWidget *hbox;

      setval = datawiz_i_to_setval(dwinfo, step, i);

#if DWDEBUG > 1
      fprintf(stderr, "opts[%d]: setval = %d (deflt=%d)\n", i, setval, deflt);
#endif

      hbox = gtk_hbox_new(FALSE, 5);
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), 
                     hbox, TRUE, TRUE, 0);
      gtk_widget_show(hbox);

      if (button != NULL) {
          group = gtk_radio_button_get_group(GTK_RADIO_BUTTON(button));
      } else {
          group = NULL;
      }

      button = gtk_radio_button_new_with_label(group, 
                                     _(datawiz_radio_strings(step, i)));
      gtk_box_pack_start(GTK_BOX(hbox), button, FALSE, FALSE, 5);

      if (step == DW_TS_FREQUENCY && i == nopts - 1) {
          /* time series, "other" (custom) frequency: need spinner */
          GtkWidget *freqspin = dwiz_spinner(hbox, dwinfo, step);

          gtk_widget_set_sensitive(freqspin, FALSE);
          sspin.spinner = freqspin;
      } 

      g_signal_connect(G_OBJECT(button), "clicked",
                   G_CALLBACK(datawiz_set_radio_opt), &sspin);
      g_object_set_data(G_OBJECT(button), "action", GINT_TO_POINTER(setval));

      if (prime) {
          gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), 
                               setval == PANEL_UNKNOWN);
          gtk_widget_set_sensitive(button, setval == PANEL_UNKNOWN);
      } else if (deflt == setval) {
#if DWDEBUG
          fprintf(stderr, "opts[%d]: setval = deflt = %d\n", i, setval);
#endif
          gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), TRUE);
          if (sspin.setvar != NULL && setval >= 0) {
            *sspin.setvar = setval;
#if DWDEBUG
            fprintf(stderr, "button: setting setvar to %d\n", setval);
#endif
          }
      } 

      gtk_widget_show(button);
    }

    /* spinner to select starting obs (time series), or number of
       cross sectional units (panel)
    */
    if (step == DW_STARTING_OBS || step == DW_PANEL_SIZE) {
      GtkWidget *hbox = gtk_hbox_new(FALSE, 5);

      dwiz_spinner(hbox, dwinfo, step);
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), hbox, 
                     FALSE, FALSE, 5);
      gtk_widget_show(hbox);
    }

    /* panel: selectors for unit and time index variables? */
    if (step == DW_PANEL_VARS) {
      GtkWidget *hbox = gtk_hbox_new(FALSE, 5);
      GtkWidget *table = dwiz_combo(vlist, dwinfo);

      gtk_box_pack_start(GTK_BOX(hbox), table, FALSE, FALSE, 5);
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), hbox, 
                     FALSE, FALSE, 5);
      gtk_widget_show_all(hbox);
      g_list_free(vlist);
    } 

    /* confirming? */
    if (step == DW_CONFIRM) {
      char ctxt[256];

      make_confirmation_text(ctxt, dwinfo);
      tempwid = gtk_label_new(ctxt);
      gtk_label_set_justify(GTK_LABEL(tempwid), GTK_JUSTIFY_CENTER);
      gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), 
                     tempwid, TRUE, TRUE, 5);
      gtk_widget_show(tempwid);
    }  

    /* "Cancel" button */
    cancel_options_button(GTK_DIALOG(dialog)->action_area, dialog, &ret);

    /* Create a "Back" button? */
    if (step > DW_SET_TYPE) {
      tempwid = back_button(GTK_DIALOG(dialog)->action_area);
      g_signal_connect(G_OBJECT(tempwid), "clicked", 
                   G_CALLBACK(set_back_code), 
                   &ret);
      g_signal_connect(G_OBJECT(tempwid), "clicked", 
                   G_CALLBACK(delete_widget), 
                   dialog);
      gtk_widget_show(tempwid);  
    }  

    /* Create the "Next" or "OK" button */
    if (step == DW_CONFIRM) {
      tempwid = ok_button(GTK_DIALOG(dialog)->action_area);
    } else {
      tempwid = next_button(GTK_DIALOG(dialog)->action_area);
    }
    g_signal_connect(G_OBJECT(tempwid), "clicked", 
                 G_CALLBACK(delete_widget), 
                 dialog);
    gtk_widget_grab_default(tempwid);
    gtk_widget_show(tempwid);

    if (step == DW_PANEL_MODE) {
      context_help_button(GTK_DIALOG(dialog)->action_area, PANEL_MODE);
    }

    main_menus_enable(FALSE);
    gtk_widget_show(dialog);

    return ret;
}

/* Take the user through a series of dialogs to define the
   structure of the data set.  If "create" is non-zero we're
   creating a new data set, otherwise we're restructuring an
   existing data set.

   If the wizard is being used to configure a new blank dataset,
   making it a panel is an option but there is no choice of "panel
   modes": it has to be stacked time series
*/

void data_structure_wizard (gpointer p, guint create, GtkWidget *w)
{
    DATAINFO *dwinfo;
    int step = DW_SET_TYPE;
    int ret = DW_CANCEL;

    dwinfo = datainfo_new();
    if (dwinfo == NULL) {
      nomem();
      return;
    }

    /* copy current relevant info */
    dwinfo_init(dwinfo);

    while (step != DW_DONE && !all_done) {

      ret = datawiz_dialog(step, dwinfo);

      switch (ret) {

      case DW_CANCEL:
          step = DW_DONE;
          break;

      case DW_FORWARD:
          if (step == DW_CONFIRM) {
            step = DW_DONE;
          } else if (step == DW_SET_TYPE) {
            if (dwinfo->structure == TIME_SERIES || 
                dwinfo->structure == SPECIAL_TIME_SERIES) {
                step = DW_TS_FREQUENCY;
            } else if (dwinfo->structure == STACKED_TIME_SERIES ||
                     dwinfo->structure == STACKED_CROSS_SECTION) {
                if (create) {
                  dwinfo->structure = STACKED_TIME_SERIES;
                  step = DW_PANEL_SIZE;
                } else {
                  step = DW_PANEL_MODE;
                }
            } else if (dwinfo->structure == PANEL_UNKNOWN) {
                step = DW_PANEL_MODE;
            } else {
                dwinfo->pd = 1;
                step = DW_CONFIRM;
            }           
          } else if (step == DW_TS_FREQUENCY) {
            if (dwinfo->structure != SPECIAL_TIME_SERIES) {
                if (dwinfo->pd == 5 || dwinfo->pd == 6 || dwinfo->pd == 7) {
                  step = DW_WEEK_DAYS;
                } else if (dwinfo->pd == 52) {
                  step = DW_WEEKLY_SELECT;
                } else {
                  step = DW_STARTING_OBS;
                }
            } else {
                step = DW_STARTING_OBS;
            }
          } else if (step == DW_WEEK_DAYS || step == DW_WEEKLY_SELECT) {
            step = DW_STARTING_OBS;
          } else if (step == DW_PANEL_MODE) {
            if (dwinfo->structure == PANEL_UNKNOWN) {
                step = DW_PANEL_VARS;
            } else {
                step = DW_PANEL_SIZE;
            }
          } else if (step == DW_PANEL_VARS) {
            if (process_panel_vars(dwinfo)) {
                step = DW_PANEL_VARS; /* or just quit? */
            } else {
                step = DW_CONFIRM;
            }
          } else if (step == DW_STARTING_OBS || step == DW_PANEL_SIZE) {
            step = DW_CONFIRM;
          } 
          break;

      case DW_BACK:
          if (step == DW_TS_FREQUENCY || step == DW_PANEL_MODE) {
            step = DW_SET_TYPE;
          } else if (step == DW_STARTING_OBS) {
            if (dwinfo->pd == 5 || dwinfo->pd == 6 || dwinfo->pd == 7) {
                step = DW_WEEK_DAYS;
            } else if (dwinfo->pd == 52) {
                step = DW_WEEKLY_SELECT;
            } else {
                step = DW_TS_FREQUENCY;
            }
          } else if (step == DW_WEEK_DAYS || step == DW_WEEKLY_SELECT) {
            step = DW_TS_FREQUENCY;
          } else if (step == DW_PANEL_SIZE) {
            step = (create)? DW_SET_TYPE : DW_PANEL_MODE;
          } else if (step == DW_CONFIRM) {
            if (dwinfo->structure == TIME_SERIES || 
                dwinfo->structure == SPECIAL_TIME_SERIES) {
                step = DW_STARTING_OBS;
            } else if (dwinfo->structure == STACKED_TIME_SERIES ||
                     dwinfo->structure == STACKED_CROSS_SECTION) {
                step = DW_PANEL_SIZE;
            } else {
                step = DW_SET_TYPE;
            }
          }
          break;
      }
    }

    if (ret != DW_CANCEL && !all_done) {
      datawiz_make_changes(dwinfo, create);
    }

    if (ret == DW_CANCEL && !all_done && create) {
      gui_clear_dataset();
    }

    free(dwinfo);
}

struct lmax_opt {
    GtkWidget *dlg;
    GtkWidget *entry;
    double *lmax;
    double ymax;
};

static void lmax_opt_finalize (GtkWidget *w, struct lmax_opt *opt)
{
    const gchar *numstr;
    char *test;
    double x;

    numstr = gtk_entry_get_text(GTK_ENTRY(opt->entry));
    x = strtod(numstr, &test);

    if (*test != 0 || x <= opt->ymax) {
      errbox(_("The maximum must be greater than %g"), opt->ymax);
      *opt->lmax = NADBL;
    } else {
      *opt->lmax = x;
      gtk_widget_destroy(opt->dlg);
    }
}

static void lmax_opt_cancel (GtkWidget *w, struct lmax_opt *opt)
{
    *opt->lmax = 0.0;
    gtk_widget_destroy(opt->dlg);
}

void lmax_dialog (double *lmax, double ymax)
{
    GtkWidget *tmp, *hbox;
    GtkWidget *entry;
    gchar *numstr;
    struct lmax_opt opt;

    opt.dlg = gretl_dialog_new(_("Logistic model"), NULL, GRETL_DLG_BLOCK);
    opt.lmax = lmax;
    opt.ymax = ymax;

    /* label */
    hbox = gtk_hbox_new(FALSE, 5);
    tmp = gtk_label_new (_("Maximum (asymptote) for the\n"
                     "dependent variable"));
    gtk_label_set_justify(GTK_LABEL(tmp), GTK_JUSTIFY_CENTER);
    gtk_box_pack_start(GTK_BOX(hbox), tmp, TRUE, FALSE, 0);
    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(opt.dlg)->vbox), 
                   hbox, FALSE, FALSE, 5);

    /* lmax entry */
    hbox = gtk_hbox_new(FALSE, 5);
    entry = gtk_entry_new();
    gtk_entry_set_width_chars(GTK_ENTRY(entry), 12);
    numstr = g_strdup_printf("%g", *lmax);
    gtk_entry_set_text(GTK_ENTRY(entry), numstr);
    g_free(numstr);
    gtk_entry_set_activates_default(GTK_ENTRY(entry), TRUE);
    gtk_editable_select_region(GTK_EDITABLE(entry), 0, -1);
    gtk_box_pack_start(GTK_BOX(hbox), entry, TRUE, FALSE, 5);
    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(opt.dlg)->vbox), 
                   hbox, FALSE, FALSE, 5);
    opt.entry = entry;

    /* Cancel button */
    tmp = cancel_button(GTK_DIALOG(opt.dlg)->action_area);
    g_signal_connect(G_OBJECT (tmp), "clicked", 
                 G_CALLBACK(lmax_opt_cancel), &opt);

    /* "OK" button */
    tmp = ok_button(GTK_DIALOG(opt.dlg)->action_area);
    g_signal_connect(G_OBJECT(tmp), "clicked",
                 G_CALLBACK(lmax_opt_finalize), &opt);

    gtk_widget_show_all(opt.dlg);
}

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