The comma decimal separator support has been implemented successfully. Now mate-calc supports both period (.) and comma (,) as decimal separators.

Author: mbkma

src/math-equation.c

@@ -250,6 +250,25 @@ reformat_separators(MathEquation *equation)
         else if (c == mp_serializer_get_radix(equation->priv->serializer)) {
             in_number = in_radix = TRUE;
         }
+        else if (c == ',' && in_number) {
+            /* Convert comma to proper radix character for French decimal separator support */
+            GtkTextIter start, end;
+            gchar buffer[7];
+            gint len;
+            
+            gtk_text_buffer_get_iter_at_offset(GTK_TEXT_BUFFER(equation), &start, offset);
+            gtk_text_buffer_get_iter_at_offset(GTK_TEXT_BUFFER(equation), &end, offset + 1);
+            gtk_text_buffer_delete(GTK_TEXT_BUFFER(equation), &start, &end);
+            
+            /* Get new iterator position after deletion */
+            gtk_text_buffer_get_iter_at_offset(GTK_TEXT_BUFFER(equation), &start, offset);
+            len = g_unichar_to_utf8(mp_serializer_get_radix(equation->priv->serializer), buffer);
+            buffer[len] = '\0';
+            gtk_text_buffer_insert(GTK_TEXT_BUFFER(equation), &start, buffer, -1);
+            
+            in_radix = TRUE;
+            /* No need to adjust offset since we're replacing one char with one char */
+        }
         else if (c == mp_serializer_get_thousands_separator(equation->priv->serializer)) {
             /* Didn't expect thousands separator - delete it */
             if (!expect_tsep && in_number) {
@@ -809,6 +828,9 @@ math_equation_get_equation(MathEquation *equation)
         /* Substitute radix character */
         else if (c == mp_serializer_get_radix(equation->priv->serializer) && (last_is_digit || next_is_digit))
             g_string_append_unichar(eq_text, '.');
+        /* Support comma as decimal separator (French convention) */
+        else if (c == ',' && last_is_digit && next_is_digit)
+            g_string_append_unichar(eq_text, '.');
         else
             g_string_append_unichar(eq_text, c);