[gnome-builder] gui: implement icons for IdeCommand

[Christian Hergert <chergert src gnome org>]

commit 8edfac94d5f8100bec06045702978d372d6bf7ed
Author: Christian Hergert <chergert redhat com>
Date:   Tue Aug 6 23:44:42 2019 -0700

    gui: implement icons for IdeCommand
    
    This allows us to propagate a GIcon to the suggestion rows which may
    provide some additional context.

 src/libide/gui/ide-command.c                       | 21 ++++++++++++++++++++
 src/libide/gui/ide-command.h                       | 23 ++++++++++++----------
 .../command-bar/gbp-command-bar-suggestion.c       | 17 ++++++++++++++++
 3 files changed, 51 insertions(+), 10 deletions(-)
---
diff --git a/src/libide/gui/ide-command.c b/src/libide/gui/ide-command.c
index 5a923ed1b..36975b6c7 100644
--- a/src/libide/gui/ide-command.c
+++ b/src/libide/gui/ide-command.c
@@ -180,3 +180,24 @@ ide_command_get_priority (IdeCommand *self)
 
   return G_MAXINT;
 }
+
+/**
+ * ide_command_get_icon:
+ * @self: a #IdeCommand
+ *
+ * Gets the icon for the command to be displayed in UI if necessary.
+ *
+ * Returns: (transfer full) (nullable): a #GIcon or %NULL
+ *
+ * Since: 3.34
+ */
+GIcon *
+ide_command_get_icon (IdeCommand *self)
+{
+  g_return_val_if_fail (IDE_IS_COMMAND (self), NULL);
+
+  if (IDE_COMMAND_GET_IFACE (self)->get_icon)
+    return IDE_COMMAND_GET_IFACE (self)->get_icon (self);
+
+  return NULL;
+}
diff --git a/src/libide/gui/ide-command.h b/src/libide/gui/ide-command.h
index 57ad694ae..0f1057a8e 100644
--- a/src/libide/gui/ide-command.h
+++ b/src/libide/gui/ide-command.h
@@ -37,18 +37,21 @@ struct _IdeCommandInterface
 {
   GTypeInterface parent_iface;
 
-  gchar    *(*get_title)    (IdeCommand           *self);
-  gchar    *(*get_subtitle) (IdeCommand           *self);
-  void      (*run_async)    (IdeCommand           *self,
-                             GCancellable         *cancellable,
-                             GAsyncReadyCallback   callback,
-                             gpointer              user_data);
-  gboolean  (*run_finish)   (IdeCommand           *self,
-                             GAsyncResult         *result,
-                             GError              **error);
-  gint      (*get_priority) (IdeCommand           *self);
+  gchar    *(*get_title)     (IdeCommand           *self);
+  gchar    *(*get_subtitle)  (IdeCommand           *self);
+  void      (*run_async)     (IdeCommand           *self,
+                              GCancellable         *cancellable,
+                              GAsyncReadyCallback   callback,
+                              gpointer              user_data);
+  gboolean  (*run_finish)    (IdeCommand           *self,
+                              GAsyncResult         *result,
+                              GError              **error);
+  gint      (*get_priority)  (IdeCommand           *self);
+  GIcon    *(*get_icon)      (IdeCommand           *self);
 };
 
+IDE_AVAILABLE_IN_3_34
+GIcon    *ide_command_get_icon     (IdeCommand           *self);
 IDE_AVAILABLE_IN_3_34
 gint      ide_command_get_priority (IdeCommand           *self);
 IDE_AVAILABLE_IN_3_32
diff --git a/src/plugins/command-bar/gbp-command-bar-suggestion.c 
b/src/plugins/command-bar/gbp-command-bar-suggestion.c
index 71a528314..da0f10d0f 100644
--- a/src/plugins/command-bar/gbp-command-bar-suggestion.c
+++ b/src/plugins/command-bar/gbp-command-bar-suggestion.c
@@ -57,6 +57,20 @@ gbp_command_bar_suggestion_set_command (GbpCommandBarSuggestion *self,
     }
 }
 
+static GIcon *
+gbp_command_bar_suggestion_get_icon (DzlSuggestion *suggestion)
+{
+  GbpCommandBarSuggestion *self = (GbpCommandBarSuggestion *)suggestion;
+  IdeCommand *command;
+
+  g_assert (GBP_IS_COMMAND_BAR_SUGGESTION (self));
+
+  if ((command = gbp_command_bar_suggestion_get_command (self)))
+    return ide_command_get_icon (command);
+
+  return NULL;
+}
+
 static void
 gbp_command_bar_suggestion_dispose (GObject *object)
 {
@@ -109,11 +123,14 @@ static void
 gbp_command_bar_suggestion_class_init (GbpCommandBarSuggestionClass *klass)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  DzlSuggestionClass *suggestion_class = DZL_SUGGESTION_CLASS (klass);
 
   object_class->dispose = gbp_command_bar_suggestion_dispose;
   object_class->get_property = gbp_command_bar_suggestion_get_property;
   object_class->set_property = gbp_command_bar_suggestion_set_property;
 
+  suggestion_class->get_icon = gbp_command_bar_suggestion_get_icon;
+
   properties [PROP_COMMAND] =
     g_param_spec_object ("command",
                          "Command",