+#define _(msgid) gettext (msgid)
+#define N_(msgid) msgid
+
+
+static void
+give_help (void)
+{
+ GtkWidget *dialog;
+
+ dialog = gtk_message_dialog_new (NULL,
+ GTK_DIALOG_MODAL,
+ GTK_MESSAGE_INFO,
+ GTK_BUTTONS_CLOSE,
+ _("Sorry. The help system hasn't yet "
+ "been implemented."));
+ gtk_dialog_run (GTK_DIALOG (dialog));
+ gtk_widget_destroy (dialog);
+}
+
+void
+connect_help (GladeXML *xml)
+{
+ GList *helps = glade_xml_get_widget_prefix (xml, "help_button_");
+
+ GList *i;
+ for ( i = g_list_first (helps); i ; i = g_list_next (i))
+ g_signal_connect (GTK_WIDGET (i->data), "clicked", give_help, 0);
+
+ g_list_free (helps);
+}
+
+
+
+void
+reference_manual (GtkMenuItem *menu, gpointer data)
+{
+ GError *err = NULL;
+ if ( ! g_spawn_command_line_async ("yelp info:pspp", &err) )
+ {
+ msg (ME, _("Cannot open reference manual: %s"), err->message);
+ }
+ g_clear_error (&err);
+}
+
+
+extern struct dataset *the_dataset;
+extern struct source_stream *the_source_stream;
+extern PsppireDataStore *the_data_store;
+
+/* Lazy casereader callback function used by execute_syntax. */
+static struct casereader *
+create_casereader_from_data_store (void *data_store_)
+{
+ PsppireDataStore *data_store = data_store_;
+ return psppire_data_store_get_reader (data_store);
+}
+
+gboolean
+execute_syntax (struct getl_interface *sss)
+{
+ struct lexer *lexer;
+ gboolean retval = TRUE;
+
+ struct casereader *reader;
+ size_t value_cnt;
+ casenumber case_cnt;
+ unsigned long int lazy_serial;
+
+ /* When the user executes a number of snippets of syntax in a
+ row, none of which read from the active file, the GUI becomes
+ progressively less responsive. The reason is that each syntax
+ execution encapsulates the active file data in another
+ datasheet layer. The cumulative effect of having a number of
+ layers of datasheets wastes time and space.
+
+ To solve the problem, we use a "lazy casereader", a wrapper
+ around the casereader obtained from the data store, that
+ only actually instantiates that casereader when it is
+ needed. If the data store casereader is never needed, then
+ it is reused the next time syntax is run, without wrapping
+ it in another layer. */
+ value_cnt = psppire_data_store_get_value_count (the_data_store);
+ case_cnt = psppire_data_store_get_case_count (the_data_store);
+ reader = lazy_casereader_create (value_cnt, case_cnt,
+ create_casereader_from_data_store,
+ the_data_store, &lazy_serial);
+ proc_set_active_file_data (the_dataset, reader);
+
+ g_return_val_if_fail (proc_has_active_file (the_dataset), FALSE);
+
+ lexer = lex_create (the_source_stream);
+
+ getl_append_source (the_source_stream, sss, GETL_BATCH, ERRMODE_CONTINUE);
+
+ for (;;)
+ {
+ enum cmd_result result = cmd_parse (lexer, the_dataset);
+
+ if ( cmd_result_is_failure (result))
+ {
+ retval = FALSE;
+ if ( source_stream_current_error_mode (the_source_stream)
+ == ERRMODE_STOP )
+ break;
+ }
+
+ if ( result == CMD_EOF || result == CMD_FINISH)
+ break;
+ }
+
+ getl_abort_noninteractive (the_source_stream);
+
+ lex_destroy (lexer);
+
+ psppire_dict_replace_dictionary (the_data_store->dict,
+ dataset_dict (the_dataset));
+
+ reader = proc_extract_active_file_data (the_dataset);
+ if (!lazy_casereader_destroy (reader, lazy_serial))
+ psppire_data_store_set_reader (the_data_store, reader);
+
+ som_flush ();
+
+ reload_the_viewer ();
+
+ return retval;
+}
+
+
+
+/* Create a deep copy of SRC */
+GtkListStore *
+clone_list_store (const GtkListStore *src)
+{
+ GtkTreeIter src_iter;
+ gboolean ok;
+ gint i;
+ const gint n_cols = gtk_tree_model_get_n_columns (GTK_TREE_MODEL (src));
+ GType *types = g_malloc (sizeof (*types) * n_cols);
+
+ int row = 0;
+ GtkListStore *dest;
+
+ for (i = 0 ; i < n_cols; ++i )
+ types[i] = gtk_tree_model_get_column_type (GTK_TREE_MODEL (src), i);
+
+ dest = gtk_list_store_newv (n_cols, types);
+
+ for (ok = gtk_tree_model_get_iter_first (GTK_TREE_MODEL (src),
+ &src_iter);
+ ok;
+ ok = gtk_tree_model_iter_next (GTK_TREE_MODEL (src), &src_iter))
+ {
+ GtkTreeIter dest_iter;
+ gtk_list_store_append (dest, &dest_iter);
+
+ for (i = 0 ; i < n_cols; ++i )
+ {
+ GValue val = {0};
+
+ gtk_tree_model_get_value (GTK_TREE_MODEL (src), &src_iter, i, &val);
+ gtk_list_store_set_value (dest, &dest_iter, i, &val);
+
+ g_value_unset (&val);
+ }
+ row++;
+ }
+
+ g_free (types);
+
+ return dest;
+}
+
+