Fix review comments for pull request.

1) Don't expose gui mode to the causual user. Hide under the DEVELOPMENT_MODE
   #define.

2) Add accessors for the ModifierLinkableList's interesting fields.

3) Free the ModifierLinkableList from modifier_linkable_list(). This allows
   us to make the free function static.

4) Rename modifier_linkable_list() to update_modifier_linkable_list().

5) In effects.h, reflect the renaming of update_modifier_linkable_list() and
   correct it's signature.

6) Whitespace fixups in gdigi.c.

7) In the handler for RECEIVE_GLOBAL_PARAMETERS, apply the parameter to the gui.

8) Fixup some merge damage ;-(

9) UnCamelCaseIze some variables.

10) When we create the gui, issue a single call to REQUEST_GLOBAL_PARAMETERS to
    retrieve the globals from the device, instead of polling each parameter
    individually.

effects.c

@@ -723,7 +723,9 @@ static EffectValues values_rp_mix = {
 static EffectSettings global_settings[] = {
     {"USB/RP Mix", USB_AUDIO_PLAYBACK_MIX, GLOBAL_POSITION, &values_rp_mix},
     {"USB Level", USB_AUDIO_LEVEL, GLOBAL_POSITION, &values_m12_to_24},
+#if defined(DEVELOPMENT_MODE)
     {"GUI Mode", GUI_MODE_ON_OFF, GLOBAL_POSITION, &values_on_off},
+#endif /* DEVELOPMENT_MODE */
     {"Tuning Reference", TUNING_REFERENCE, GLOBAL_POSITION, &values_0_to_29},
     {"Pedal Position", EXP_PEDAL_LEVEL, GLOBAL_POSITION, &values_0_to_255},
     {"Stomp", STOMP_MODE, GLOBAL_POSITION, &values_on_off},
@@ -4308,12 +4310,52 @@ static void effect_settings_free(EffectSettings *settings)
  * Used for Pedal Assignment and the LFO's.
  */
 ModifierGroup *ModifierLinkableList;
+
+EffectGroup *get_modifier_group(void)
+{
+    EffectGroup *group = NULL;
+    if (ModifierLinkableList) {
+        group = ModifierLinkableList->group;
+    }
+    return group;
+}
+
+guint get_modifier_amt(void)
+{
+    guint amt = 0;
+    if (ModifierLinkableList) {
+        amt = ModifierLinkableList->group_amt;
+    }
+    return amt;
+}
+
 /**
- *  Retrieves modifier linkable group from device.
+ *  \param modifier_group group to be freed
  *
- *  \return ModifierGroup which must be freed using modifier_group_free.
+ *  Frees all memory used by ModifierGroup.
  **/
-ModifierGroup *modifier_linkable_list(GString *msg)
+static void modifier_group_free(ModifierGroup *modifier_group)
+{
+    g_return_if_fail(modifier_group != NULL);
+
+    int x;
+    for (x=0; x<modifier_group->group_amt; x++) {
+        if (modifier_group->group[x].settings)
+            effect_settings_free(modifier_group->group[x].settings);
+    }
+    g_slice_free1(modifier_group->group_amt * sizeof(EffectGroup),
+                  modifier_group->group);
+    g_slice_free(ModifierGroup, modifier_group);
+}
+/**
+ *  Retrieves modifier linkable group from device and updates the
+ *  global list of linkable parameters. The old list is freed.
+ *
+ *  \param msg    A buffer containing the message with the list of
+ *                linkable parameters.
+ *  
+ **/
+void update_modifier_linkable_list(GString *msg)
 {
     guint group_id;
     guint count;
@@ -4362,29 +4404,13 @@ ModifierGroup *modifier_linkable_list(GString *msg)
     modifier_group->group = group;
     modifier_group->group_amt = count;
 
+    if (ModifierLinkableList) {
+        modifier_group_free(ModifierLinkableList);
+        ModifierLinkableList = NULL;
+    }
     ModifierLinkableList = modifier_group;
-
-    return modifier_group;
 }
 
-/**
- *  \param modifier_group group to be freed
- *
- *  Frees all memory used by ModifierGroup.
- **/
-void modifier_group_free(ModifierGroup *modifier_group)
-{
-    g_return_if_fail(modifier_group != NULL);
-
-    int x;
-    for (x=0; x<modifier_group->group_amt; x++) {
-        if (modifier_group->group[x].settings)
-            effect_settings_free(modifier_group->group[x].settings);
-    }
-    g_slice_free1(modifier_group->group_amt * sizeof(EffectGroup),
-                  modifier_group->group);
-    g_slice_free(ModifierGroup, modifier_group);
-}
 
 /**
  *  \param values EffectValues to examine

effects.h

@@ -118,9 +118,10 @@ typedef struct {
 } Device;
 
 gchar *get_position(guint position);
-ModifierGroup *modifier_linkable_list();
+void update_modifier_linkable_list(GString* msg);
 extern ModifierGroup *ModifierLinkableList;
-void modifier_group_free(ModifierGroup *modifier_group);
+EffectGroup *get_modifier_group(void);
+guint get_modifier_amt(void);
 void get_values_info(EffectValues *values,
                      gdouble *min, gdouble *max, gboolean *custom);
 gboolean get_device_info(unsigned char device_id, unsigned char family_id,

gdigi.c

@@ -484,11 +484,6 @@ void push_message(GString *msg)
                           "id %d changed",
                           (str[9] << 8) | (str[10]));
 
-                if (ModifierLinkableList) {
-                    modifier_group_free(ModifierLinkableList);
-                    ModifierLinkableList = NULL;
-                }
-
                 send_message(REQUEST_MODIFIER_LINKABLE_LIST, "\x00\x01", 2);
                 break;
             }
@@ -518,6 +513,11 @@ void push_message(GString *msg)
                           "Position: %2.1d Value: %6.1d: %s",
                           param->id,
                           param->position, param->value, "XXX");
+
+                GDK_THREADS_ENTER();
+                apply_setting_param_to_gui(param);
+                GDK_THREADS_LEAVE();
+
                 setting_param_free(param);
             } while ( (x < msg->len) && n < tot);
 
@@ -536,7 +536,7 @@ void push_message(GString *msg)
                 printf("\n");
             }
 
-            modifier_linkable_list(msg);
+            update_modifier_linkable_list(msg);
 
             g_string_free(msg, TRUE);
 
@@ -1365,6 +1365,10 @@ static gboolean request_who_am_i(unsigned char *device_id, unsigned char *family
         *family_id = data->str[9];
         *product_id = data->str[10];
         g_string_free(data, TRUE);
+        debug_msg(DEBUG_STARTUP, "Found device id %d family %d product id %d.",
+                                *device_id,
+                                *family_id,
+                                *product_id);
         return TRUE;
     }
     return FALSE;
@@ -1487,7 +1491,7 @@ int main(int argc, char *argv[]) {
         GList *device = NULL;
         int    num_devices = 0;
         int    chosen_device = 0;
-        if (get_digitech_devices(&devices) <= 0) {
+        if ((num_devices = get_digitech_devices(&devices)) <= 0) {
             g_warning("Couldn't find DigiTech devices!");
             exit(EXIT_FAILURE);
         }

gui.c

@@ -683,10 +683,12 @@ GtkWidget *create_widget_container(EffectGroup *group, gint amt, gint id, gint p
 /**
  * Populate a combo box with text entries from the modifier group.
  */
-void update_modifier_combo_box(GObject *combo_box, EffectGroup *group, gint amt, gint id, gint position)
+void update_modifier_combo_box(GObject *combo_box, gint id, gint position)
 {
     gint x;
     EffectSettingsGroup *settings = NULL;
+    EffectGroup *group = get_modifier_group();
+    guint amt = get_modifier_amt();
 
     for (x = 0; x<amt; x++) {
         gchar *name;
@@ -711,7 +713,7 @@ void update_modifier_combo_box(GObject *combo_box, EffectGroup *group, gint amt,
 
 static void widget_tree_elem_free(GList *);
 
-static void clean_modifier_combo_box (GObject *ComboBox, GList *list)
+static void clean_modifier_combo_box (GObject *combo_box, GList *list)
 {
     EffectSettingsGroup *settings = NULL;
     WidgetTreeElem *el;
@@ -727,9 +729,9 @@ static void clean_modifier_combo_box (GObject *ComboBox, GList *list)
             /* Useless assignment, but silences compiler warning. */
             link = g_list_remove_link(list, link);
             
-            g_assert(ComboBox == el->widget);
+            g_assert(combo_box == el->widget);
             name = g_strdup_printf("SettingsGroup%d", el->x);
-            settings = g_object_steal_data(G_OBJECT(ComboBox), name);
+            settings = g_object_steal_data(G_OBJECT(combo_box), name);
 
             g_free(name);
             g_slice_free(EffectSettingsGroup, settings);
@@ -737,7 +739,7 @@ static void clean_modifier_combo_box (GObject *ComboBox, GList *list)
         }
         link = next;
     }
-    gtk_combo_box_text_remove_all(GTK_COMBO_BOX_TEXT(ComboBox));
+    gtk_combo_box_text_remove_all(GTK_COMBO_BOX_TEXT(combo_box));
 }
 
 /**
@@ -754,7 +756,7 @@ create_modifier_group (guint pos, guint id)
     gpointer key;
     WidgetTreeElem *el;
     GList *list;
-    GObject *AssignComboBox;
+    GObject *modifier_combo_box;
 
     debug_msg(DEBUG_GROUP, "Building modifier group for position %d id %d \"%s\"",
                            pos, id, get_xml_settings(id, pos)->label);
@@ -780,18 +782,15 @@ create_modifier_group (guint pos, guint id)
         return;
     }
 
-    AssignComboBox = el->widget;
+    modifier_combo_box = el->widget;
-    g_assert(AssignComboBox != NULL);
+    g_assert(modifier_combo_box != NULL);
 
-    vbox = g_object_get_data(AssignComboBox, "vbox");
+    vbox = g_object_get_data(modifier_combo_box, "vbox");
     g_assert(vbox != NULL);
 
-    clean_modifier_combo_box(AssignComboBox, list);
+    clean_modifier_combo_box(modifier_combo_box, list);
 
-    update_modifier_combo_box(AssignComboBox,
+    update_modifier_combo_box(modifier_combo_box, id, pos);
-                              ModifierLinkableList->group,
-                              ModifierLinkableList->group_amt,
-                              id, pos);
 
     get_option(id, pos);
 }
@@ -1508,15 +1507,9 @@ void gui_create(Device *device)
 
     g_signal_connect(G_OBJECT(window), "delete_event", G_CALLBACK(gtk_main_quit), NULL);
 
-    /* Not part of the preset, but update from the device. */
+    /* Get the initial values for the linkable parameters and the globals. */
-    get_option(TUNING_REFERENCE, GLOBAL_POSITION);
-    get_option(USB_AUDIO_PLAYBACK_MIX, GLOBAL_POSITION);
-    get_option(GUI_MODE_ON_OFF, GLOBAL_POSITION);
-    get_option(USB_AUDIO_LEVEL, GLOBAL_POSITION);
-    get_option(EXP_PEDAL_LEVEL, GLOBAL_POSITION);
-    get_option(STOMP_MODE, GLOBAL_POSITION);
-
     send_message(REQUEST_MODIFIER_LINKABLE_LIST, "\x00\x01", 2);
+    send_message(REQUEST_GLOBAL_PARAMETERS, "\x00\x01", 2);
 }
 
 /**