[PATCH 3/4] Add Grilo command-line options

["Juan A. Suarez Romero" <jasuarez igalia com>]

Allow all Grilo-based applications to receive command-line options affecting
Grilo.

Right now, there is just one option: --grl-plugin-path. It allows to set the
default plugins dir, and overrides the GRL_PLUGIN_PATH envvar.
---
 src/grilo.c |   34 +++++++++++++++++++++++++++++-----
 1 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/src/grilo.c b/src/grilo.c
index 83ac5ac..5eb4222 100644
--- a/src/grilo.c
+++ b/src/grilo.c
@@ -27,13 +27,21 @@
 #define GRL_PLUGIN_PATH_DEFAULT GRL_PLUGINS_DIR
 
 static gboolean grl_initialized = FALSE;
+static const gchar *plugin_path = NULL;
+
+static const GOptionEntry grl_args[] = {
+  { "grl-plugin-path", 0, 0, G_OPTION_ARG_STRING, &plugin_path,
+    "Colon-separated paths containing plugins", NULL },
+  { NULL }
+};
 
 void
 grl_init (gint *argc,
           gchar **argv[])
 {
+  GOptionContext *ctx;
+  GOptionGroup *group;
   GrlPluginRegistry *registry;
-  const gchar *plugin_dirs;
   gchar **plugin_dir;
   gchar **plugin_dirs_split;
 
@@ -42,6 +50,19 @@ grl_init (gint *argc,
     return;
   }
 
+  /* Parse command-line options */
+  group = g_option_group_new ("grl",
+                              "Grilo Options",
+                              "Show Grilo Options",
+                              NULL,
+                              NULL);
+  g_option_group_add_entries (group, grl_args);
+  ctx = g_option_context_new ("- Grilo initialization");
+  g_option_context_set_ignore_unknown_options (ctx, TRUE);
+  g_option_context_add_group (ctx, group);
+  g_option_context_parse (ctx, argc, argv, NULL);
+  g_option_context_free (ctx);
+
   /* Register default metadata keys */
   registry = grl_plugin_registry_get_instance ();
   grl_metadata_key_setup_system_keys (registry);
@@ -53,12 +74,15 @@ grl_init (gint *argc,
   g_type_class_ref (GRL_TYPE_MEDIA_IMAGE);
 
   /* Set default plugin directories */
-  plugin_dirs = g_getenv (GRL_PLUGIN_PATH_VAR);
-  if (!plugin_dirs) {
-    plugin_dirs = GRL_PLUGIN_PATH_DEFAULT;
+  if (!plugin_path) {
+    plugin_path = g_getenv (GRL_PLUGIN_PATH_VAR);
+  }
+
+  if (!plugin_path) {
+    plugin_path = GRL_PLUGIN_PATH_DEFAULT;
   }
 
-  plugin_dirs_split = g_strsplit (plugin_dirs, ":", 0);
+  plugin_dirs_split = g_strsplit (plugin_path, ":", 0);
   for (plugin_dir = plugin_dirs_split; *plugin_dir; plugin_dir++) {
     grl_plugin_registry_add_directory (registry, *plugin_dir);
   }
-- 
1.7.0.4