[gnome-builder/wip/file-settings: 1/4] file-settings: make file settings a tree

[Christian Hergert <chergert src gnome org>]

commit 013d29caed38c9abcf4c3d088c2699f0fff3aa9f
Author: Christian Hergert <christian hergert me>
Date:   Tue May 5 01:28:47 2015 -0700

    file-settings: make file settings a tree
    
    This allows file settings to have child settings. If the instance doesn't
    have the property set, it will progress to the first child property
    (and so forth).
    
    This should allow us to layer settings from backends like editorconfig
    and gsettings.

 libide/ide-file-settings.c |   92 ++++++++++++++++++++++++++++++++++++++++++++
 libide/ide-file-settings.h |    3 +-
 libide/ide-internal.h      |    2 +
 3 files changed, 96 insertions(+), 1 deletions(-)
---
diff --git a/libide/ide-file-settings.c b/libide/ide-file-settings.c
index f564cbc..158a855 100644
--- a/libide/ide-file-settings.c
+++ b/libide/ide-file-settings.c
@@ -38,6 +38,8 @@
 
 typedef struct
 {
+  GPtrArray *children;
+
   IdeFile *file;
 
 #define IDE_FILE_SETTINGS_PROPERTY(_1, name, field_type, _3, _pname, _4, _5, _6) \
@@ -70,7 +72,17 @@ static GParamSpec *gParamSpecs [LAST_PROP];
 ret_type ide_file_settings_get_##name (IdeFileSettings *self) \
 { \
   IdeFileSettingsPrivate *priv = ide_file_settings_get_instance_private (self); \
+  gsize i; \
   g_return_val_if_fail (IDE_IS_FILE_SETTINGS (self), (ret_type)0); \
+  if (priv->children != NULL) \
+    { \
+      for (i = 0; i < priv->children->len; i++) \
+        { \
+          IdeFileSettings *child = g_ptr_array_index (priv->children, i); \
+          if (ide_file_settings_get_##name##_set (child)) \
+            return ide_file_settings_get_##name (child); \
+        } \
+    } \
   return priv->name; \
 }
 # include "ide-file-settings.defs"
@@ -95,6 +107,7 @@ void ide_file_settings_set_##name (IdeFileSettings *self, \
   assign_stmt \
   priv->name##_set = TRUE; \
   g_object_notify_by_pspec (G_OBJECT (self), gParamSpecs [PROP_##NAME]); \
+  g_object_notify_by_pspec (G_OBJECT (self), gParamSpecs [PROP_##NAME##_SET]); \
 }
 # include "ide-file-settings.defs"
 #undef IDE_FILE_SETTINGS_PROPERTY
@@ -156,6 +169,7 @@ ide_file_settings_finalize (GObject *object)
   IdeFileSettings *self = (IdeFileSettings *)object;
   IdeFileSettingsPrivate *priv = ide_file_settings_get_instance_private (self);
 
+  g_clear_pointer (&priv->children, g_ptr_array_unref);
   g_clear_pointer (&priv->encoding, g_free);
   ide_clear_weak_pointer (&priv->file);
 
@@ -275,3 +289,81 @@ ide_file_settings_init (IdeFileSettings *self)
   priv->tab_width = 8;
   priv->trim_trailing_whitespace = TRUE;
 }
+
+static void
+ide_file_settings_child_notify (IdeFileSettings *self,
+                                GParamSpec      *pspec,
+                                IdeFileSettings *child)
+{
+  g_assert (IDE_IS_FILE_SETTINGS (self));
+  g_assert (pspec != NULL);
+  g_assert (IDE_IS_FILE_SETTINGS (child));
+
+  if (pspec->owner_type == IDE_TYPE_FILE_SETTINGS)
+    g_object_notify_by_pspec (G_OBJECT (self), pspec);
+}
+
+void
+_ide_file_settings_prepend (IdeFileSettings *self,
+                            IdeFileSettings *child)
+{
+  IdeFileSettingsPrivate *priv = ide_file_settings_get_instance_private (self);
+
+  g_return_if_fail (IDE_IS_FILE_SETTINGS (self));
+  g_return_if_fail (IDE_IS_FILE_SETTINGS (child));
+
+  g_signal_connect_object (child,
+                           "notify",
+                           G_CALLBACK (ide_file_settings_child_notify),
+                           self,
+                           G_CONNECT_SWAPPED);
+
+  if (priv->children == NULL)
+    priv->children = g_ptr_array_new_with_free_func (g_object_unref);
+
+  g_ptr_array_insert (priv->children, 0, g_object_ref (child));
+}
+
+IdeFileSettings *
+ide_file_settings_new (IdeFile *file)
+{
+  GIOExtensionPoint *extension_point;
+  IdeFileSettings *ret;
+  IdeContext *context;
+  GList *list;
+
+  g_return_val_if_fail (IDE_IS_FILE (file), NULL);
+
+  context = ide_object_get_context (IDE_OBJECT (file));
+  ret = g_object_new (IDE_TYPE_FILE_SETTINGS,
+                      "context", context,
+                      "file", file,
+                      NULL);
+
+  extension_point = g_io_extension_point_lookup (IDE_FILE_SETTINGS_EXTENSION_POINT);
+  list = g_io_extension_point_get_extensions (extension_point);
+
+  for (; list; list = list->next)
+    {
+      GIOExtension *extension = list->data;
+      g_autoptr(IdeFileSettings) child = NULL;
+      GType gtype;
+
+      gtype = g_io_extension_get_type (extension);
+
+      if (!g_type_is_a (gtype, IDE_TYPE_FILE_SETTINGS))
+        {
+          g_warning ("%s is not an IdeFileSettings", g_type_name (gtype));
+          continue;
+        }
+
+      child = g_object_new (gtype,
+                            "file", file,
+                            "context", context,
+                            NULL);
+
+      _ide_file_settings_prepend (ret, child);
+    }
+
+  return ret;
+}
diff --git a/libide/ide-file-settings.h b/libide/ide-file-settings.h
index a46d140..16da976 100644
--- a/libide/ide-file-settings.h
+++ b/libide/ide-file-settings.h
@@ -37,7 +37,8 @@ struct _IdeFileSettingsClass
   IdeObjectClass parent;
 };
 
-IdeFile *ide_file_settings_get_file (IdeFileSettings *self);
+IdeFileSettings *ide_file_settings_new      (IdeFile         *file);
+IdeFile         *ide_file_settings_get_file (IdeFileSettings *self);
 
 #define IDE_FILE_SETTINGS_PROPERTY(_1, name, _2, ret_type, _3, _4, _5, _6) \
   ret_type ide_file_settings_get_##name (IdeFileSettings *self);
diff --git a/libide/ide-internal.h b/libide/ide-internal.h
index 5705284..c0e89e0 100644
--- a/libide/ide-internal.h
+++ b/libide/ide-internal.h
@@ -86,6 +86,8 @@ const gchar        *_ide_file_get_content_type         (IdeFile               *s
 GtkSourceFile      *_ide_file_set_content_type         (IdeFile               *self,
                                                         const gchar           *content_type);
 GtkSourceFile      *_ide_file_get_source_file          (IdeFile               *self);
+void                _ide_file_settings_add_child       (IdeFileSettings       *self,
+                                                        IdeFileSettings       *child);
 IdeFixit           *_ide_fixit_new                     (IdeSourceRange        *source_range,
                                                         const gchar           *replacement_text);
 void                _ide_project_set_name              (IdeProject            *project,