index: Display page label alongside page number

Displays target page as "Page <label> (<number>)" in the index,
e.g. "Page iv (6)".  When no page label is defined, the previous
"Page <number>" format is retained.
This is consistant with the status bar formatting.

The additional "(<number>)" is in a new column to keep it aligned.

zathura/callbacks.c

@@ -363,7 +363,7 @@ cb_index_row_activated(GtkTreeView* tree_view, GtkTreePath* path,
 
   if(gtk_tree_model_get_iter(model, &iter, path)) {
     zathura_index_element_t* index_element;
-    gtk_tree_model_get(model, &iter, 2, &index_element, -1);
+    gtk_tree_model_get(model, &iter, 3, &index_element, -1);
 
     if (index_element == NULL) {
       return;

zathura/shortcuts.c

@@ -1175,7 +1175,7 @@ sc_toggle_index(girara_session_t* session, girara_argument_t* UNUSED(argument),
       goto error_free;
     }
 
-    model = GTK_TREE_MODEL(gtk_tree_store_new(3, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_POINTER));
+    model = GTK_TREE_MODEL(gtk_tree_store_new(4, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_POINTER));
     if (model == NULL) {
       goto error_free;
     }
@@ -1200,12 +1200,13 @@ sc_toggle_index(girara_session_t* session, girara_argument_t* UNUSED(argument),
       goto error_free;
     }
 
-    document_index_build(model, NULL, document_index);
+    document_index_build(session, model, NULL, document_index);
     girara_node_free(document_index);
 
     /* setup widget */
     gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW (treeview), 0, "Title", renderer, "markup", 0, NULL);
     gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW (treeview), 1, "Target", renderer2, "text", 1, NULL);
+    gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW (treeview), 2, "(alt)", renderer2, "text", 2, NULL);
 
     gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(treeview), FALSE);
     g_object_set(G_OBJECT(renderer), "ellipsize", PANGO_ELLIPSIZE_END, NULL);

zathura/utils.c

@@ -70,7 +70,9 @@ index_element_free(void* data, GObject* UNUSED(object))
   zathura_index_element_free(element);
 }
 
-void document_index_build(GtkTreeModel* model, GtkTreeIter* parent, girara_tree_node_t* tree) {
+void document_index_build(girara_session_t* session, GtkTreeModel* model,
+                          GtkTreeIter* parent, girara_tree_node_t* tree)
+{
   girara_list_t* list = girara_node_get_children(tree);
 
   for (size_t idx = 0; idx != girara_list_size(list); ++idx) {
@@ -80,8 +82,20 @@ void document_index_build(GtkTreeModel* model, GtkTreeIter* parent, girara_tree_
     zathura_link_target_t target           = zathura_link_get_target(index_element->link);
 
     gchar* description = NULL;
+    gchar* description2 = NULL;
+
     if (type == ZATHURA_LINK_GOTO_DEST) {
-      description = g_strdup_printf("Page %d", target.page_number + 1);
+      zathura_t *zathura = session->global.data;
+      zathura_page_t *page = zathura_document_get_page(zathura->document, target.page_number);
+      char *label = zathura_page_get_label(page, NULL);
+
+      if (label != NULL) {
+        description = g_strdup_printf("Page %s", label);
+        description2 = g_strdup_printf("(%d)", target.page_number + 1);
+        g_free(label);
+      } else {
+        description = g_strdup_printf("Page %d", target.page_number + 1);
+      }
     } else {
       description = g_strdup(target.value);
     }
@@ -89,13 +103,15 @@ void document_index_build(GtkTreeModel* model, GtkTreeIter* parent, girara_tree_
     GtkTreeIter tree_iter;
     gtk_tree_store_append(GTK_TREE_STORE(model), &tree_iter, parent);
     gchar* markup = g_markup_escape_text(index_element->title, -1);
-    gtk_tree_store_set(GTK_TREE_STORE(model), &tree_iter, 0, markup, 1, description, 2, index_element, -1);
+    gtk_tree_store_set(GTK_TREE_STORE(model), &tree_iter, 0, markup,
+                       1, description, 2, description2, 3, index_element, -1);
     g_free(markup);
-    g_object_weak_ref(G_OBJECT(model), index_element_free, index_element);
     g_free(description);
+    g_free(description2);
+    g_object_weak_ref(G_OBJECT(model), index_element_free, index_element);
 
     if (girara_node_get_num_children(node) > 0) {
-      document_index_build(model, &tree_iter, node);
+      document_index_build(session, model, &tree_iter, node);
     }
   }
 }

zathura/utils.h

@@ -31,11 +31,12 @@ bool file_valid_extension(zathura_t* zathura, const char* path);
  * Generates the document index based upon the list retrieved from the document
  * object.
  *
+ * @param session The session
  * @param model The tree model
  * @param parent The tree iterator parent
  * @param tree The Tree iterator
  */
-void document_index_build(GtkTreeModel* model, GtkTreeIter* parent, girara_tree_node_t* tree);
+void document_index_build(girara_session_t* session, GtkTreeModel* model, GtkTreeIter* parent, girara_tree_node_t* tree);
 
 /**
  * Rotate a rectangle by 0, 90, 180 or 270 degree