Instead of debian debtags, output a GKeyFile string instead for a giv…

…en package.

The first commandline argument now has to be the package name for which the plugin .so list follows.

Then e.g this could be called to get the metadata outputted to an .ini-like file of all installed plugins:

for i in list_of_gst_pkgs; do
  qlist -e $i |grep '/usr/lib64/gstreamer-0[.]10/.*[.]so$' |xargs ./gst-codec-info-0.10 $i
done > gst-plugins.ini

Maintainer just has to have all the plugins installed.
A later improvement would be a management tool to instead update the listing on each pkg_postinst on
maintainers machine and notify when the package installing the ini file to users might need to be upgraded.

gst-codec-info.c → gentoo-gst-codec-info.c

@@ -1,10 +1,12 @@
 /* GStreamer
  * Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>
+ * Copyright (C) 2011 Mart Raudsepp <leio@gentoo.org>
  *
- * gst-codec-info.c: tool to print automatic codec installation info
- *                   for a given list of plugins
+ * gentoo-gst-codec-info.c: tool to print automatic codec installation info
+ *                          for a given list of plugins, customized for Gentoo
  *
- * Partially based on gst-inspect from gstreamer.
+ * Based on debian gstreamer0.10-dev gst-codec-info.c, which in turn
+ * partially based on gst-inspect from gstreamer.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ -59,63 +61,68 @@ free_plugin_info (void)
 }
 
 static void
-print_plugin_info (void)
+set_key_file_values_from_list (GKeyFile *keyfile, GList *list, const gchar *package, const gchar *key)
 {
   GList *l;
+  guint i, len;
+  gchar **strs = NULL;
+
+  len = g_list_length (list);
+  strs = g_new (gchar *, len);
+
+  for (i = 0, l = list; l; l = l->next, i++) {
+    strs[i] = (gchar *) l->data;
+  }
+
+  g_key_file_set_string_list (keyfile, package, key,
+                              (const gchar **const) strs, len);
+
+  g_free (strs);
+}
+
+static void
+print_plugin_info (const gchar *package)
+{
+  GList *l;
+  int i;
+  GKeyFile *keyfile = g_key_file_new ();
 
   if (elements) {
-    g_print ("gstreamer:Elements=");
-    for (l = elements; l; l = l->next) {
-      if (l->next)
-        g_print ("%s, ", (gchar *) l->data);
-      else
-        g_print ("%s\n", (gchar *) l->data);
-    }
+    set_key_file_values_from_list (keyfile, elements, package, "Elements");
   }
 
   if (provides) {
-    g_print ("gstreamer:Provides=");
-    for (l = provides; l; l = l->next) {
-      if (l->next)
-        g_print ("%s, ", (gchar *) l->data);
-      else
-        g_print ("%s\n", (gchar *) l->data);
-    }
+    set_key_file_values_from_list (keyfile, provides, package, "Provides");
   }
 
   if (uri_sources) {
-    g_print ("gstreamer:URISources=");
-    for (l = uri_sources; l; l = l->next) {
-      if (l->next)
-        g_print ("%s, ", (gchar *) l->data);
-      else
-        g_print ("%s\n", (gchar *) l->data);
-    }
+    set_key_file_values_from_list (keyfile, uri_sources, package, "URISources");
   }
 
   if (uri_sinks) {
-    g_print ("gstreamer:URISinks=");
-    for (l = uri_sinks; l; l = l->next) {
-      if (l->next)
-        g_print ("%s, ", (gchar *) l->data);
-      else
-        g_print ("%s\n", (gchar *) l->data);
-    }
+    set_key_file_values_from_list (keyfile, uri_sinks, package, "URISinks");
   }
 
   if (!gst_caps_is_empty (encoders)) {
     gchar *caps = gst_caps_to_string (encoders);
 
-    g_print ("gstreamer:Encoders=%s\n", caps);
+    g_key_file_set_string (keyfile, package, "Encoders", caps);
     g_free (caps);
   }
 
   if (!gst_caps_is_empty (decoders)) {
     gchar *caps = gst_caps_to_string (decoders);
 
-    g_print ("gstreamer:Decoders=%s\n", caps);
+    g_key_file_set_string (keyfile, package, "Decoders", caps);
     g_free (caps);
   }
+
+  {
+    gchar *keystr;
+    keystr = g_key_file_to_data (keyfile, NULL, NULL);
+    g_print ("%s", keystr);
+    g_free (keystr);
+  }
 }
 
 static void
@@ -407,13 +414,13 @@ main (int argc, char **argv)
 
   gst_version (&major, &minor, &micro, &nano);
 
-  if (argc == 1)
+  if (argc == 1 || argc == 2)
     return 0;
 
   encoders = gst_caps_new_empty ();
   decoders = gst_caps_new_empty ();
 
-  for (i = 1; i < argc; i++) {
+  for (i = 2; i < argc; i++) {
     GstPlugin *plugin = NULL;
     GError *error = NULL;
 
@@ -435,11 +442,13 @@ main (int argc, char **argv)
     collect_plugin_info (plugin);
   }
 
+#if 0
   if (elements)
     g_print ("gstreamer:Version=%u.%u\n", major, minor);
+#endif
 
   cleanup_plugin_info ();
-  print_plugin_info ();
+  print_plugin_info (argv[1]);
   free_plugin_info ();
 
   return 0;