[glibmm] SettingsSchemaSource: Implement list_schemas()

[Daniel Boles <dboles src gnome org>]

commit fc70c08a326931d712cb7b53b04814c6bc9b2e90
Author: Daniel Boles <dboles src gmail com>
Date:   Fri Nov 15 17:34:07 2019 +0000

    SettingsSchemaSource: Implement list_schemas()
    
    https://bugzilla.gnome.org/show_bug.cgi?id=783216
    https://gitlab.gnome.org/GNOME/glibmm/issues/19
    https://gitlab.gnome.org/GNOME/glibmm/merge_requests/20

 gio/src/settingsschemasource.ccg | 16 ++++++++++++++++
 gio/src/settingsschemasource.hg  | 26 ++++++++++++++++++++++++--
 2 files changed, 40 insertions(+), 2 deletions(-)
---
diff --git a/gio/src/settingsschemasource.ccg b/gio/src/settingsschemasource.ccg
index 1c733264..d1ae281d 100644
--- a/gio/src/settingsschemasource.ccg
+++ b/gio/src/settingsschemasource.ccg
@@ -16,7 +16,23 @@
 
 #include <gio/gio.h>
 
+#include <glibmm/vectorutils.h>
+
 namespace Gio
 {
 
+std::vector<Glib::ustring>
+SettingsSchemaSource::list_schemas(bool relocatable, bool recursive) const
+{
+  auto gobject = const_cast<GSettingsSchemaSource*>(gobj());
+  gchar** schemas{};
+
+  if (relocatable)
+    g_settings_schema_source_list_schemas(gobject, recursive, nullptr, &schemas);
+  else
+    g_settings_schema_source_list_schemas(gobject, recursive, &schemas, nullptr);
+
+  return Glib::ArrayHandler<Glib::ustring>::array_to_vector(schemas, Glib::OWNERSHIP_DEEP);
+}
+
 } // namespace Gio
diff --git a/gio/src/settingsschemasource.hg b/gio/src/settingsschemasource.hg
index 5975c38c..69170794 100644
--- a/gio/src/settingsschemasource.hg
+++ b/gio/src/settingsschemasource.hg
@@ -18,6 +18,9 @@ _CONFIGINCLUDE(giommconfig.h)
 
 #include <giomm/settingsschema.h>
 
+#include <glibmm/ustring.h>
+#include <vector>
+
 _DEFS(giomm,gio)
 _PINCLUDE(glibmm/private/object_p.h)
 
@@ -42,7 +45,6 @@ protected:
   _IGNORE(g_settings_schema_source_ref, g_settings_schema_source_unref)
 
 public:
-
   _WRAP_METHOD(static Glib::RefPtr<SettingsSchemaSource> get_default(), 
g_settings_schema_source_get_default, refreturn)
 
 /* TODO:
@@ -58,7 +60,27 @@ GSettingsSchemaSource * g_settings_schema_source_new_from_directory     (const g
   _WRAP_METHOD(Glib::RefPtr<SettingsSchema> lookup(const Glib::ustring& schema_id, bool recursive), 
g_settings_schema_source_lookup)
   _WRAP_METHOD(Glib::RefPtr<const SettingsSchema> lookup(const Glib::ustring& schema_id, bool recursive) 
const, g_settings_schema_source_lookup)
 
-  //TODO:_WRAP_METHOD(void list_schemas(bool recursive,  gchar*** non_relocatable, gchar*** relocatable), 
g_settings_schema_source_list_schemas)
+  _IGNORE(g_settings_schema_source_list_schemas)
+  /** Lists the schemas in a given source.
+   *
+   * Do not call this function from normal programs. It is designed for use by
+   * database editors, commandline tools, etc.
+   *
+   * @newin{2,64}
+   *
+   * @param relocatable Whether you want the list of relocatable schemas
+   * (<tt>true</tt>) or the list of non-relocatable schemas (<tt>false</tt>)
+   * for this source. Non-relocatable schemas are those for which you can call
+   * Gio::Settings::create() without specifying a path. Relocatable schemas are
+   * those for which you must pass a path to Gio::Settings::create().
+   *
+   * @param recursive If <tt>true</tt>, the list will include parent sources.
+   * If <tt>false</tt>, it will only include the schemas from one source (i.e.
+   * one directory). You probably want to recurse.
+   *
+   * @return a vector of the names of the schemas matching the given parameters.
+   */
+  std::vector<Glib::ustring> list_schemas(bool relocatable, bool recursive) const;
 };
 
 } // namespace Gio