g-ir-inspect: Inspect GI typelibs

Various distributions (mainly RPM based so far) make use of automatic
dependencies extracted from typelib files (they can require other typelibs
and also shared libraries)

Current features
* Print used shared libraries
* Print used typelib dependencies

Based-on-patch-by: Dominique Leuenberger <dimstar@opensuse.org>
Reference: https://bugzilla.gnome.org/show_bug.cgi?id=665672
Reviewed-by: Colin Walters <walters@verbum.org>
Signed-off-by: Dominique Leuenberger <dimstar@opensuse.org>
Signed-off-by: Igor Gnatenko <ignatenko@redhat.com>

girepository/tools/g-ir-inspect.c

@@ -0,0 +1,133 @@
+/* GObject introspection: typelib inspector
+ *
+ * Copyright (C) 2011-2016 Dominique Leuenberger <dimstar@opensuse.org>
+ * Copyright © 2016 Igor Gnatenko <ignatenko@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <glib.h>
+#include <girepository.h>
+#include <stdlib.h>
+
+static void
+print_shlibs (const gchar *namespace)
+{
+  guint i = 0;
+
+  /* Finding the shared library we depend on (if any) */
+  const gchar *shlibs = g_irepository_get_shared_library (NULL, namespace);
+  if (shlibs && shlibs[0] != '\0')
+    {
+      /* shlibs is a comma-separated list of libraries */
+      GStrv libs = g_strsplit (shlibs, ",", -1);
+      for (i = 0; libs[i]; i++)
+        g_print ("shlib: %s\n", libs[i]);
+      g_strfreev (libs);
+    }
+}
+
+static void
+print_typelibs (const gchar *namespace)
+{
+  guint i = 0;
+
+  /* Finding all the typelib-based Requires */
+  GStrv deps = g_irepository_get_dependencies (NULL, namespace);
+  if (deps)
+    {
+      for (i = 0; deps[i]; i++)
+        g_print ("typelib: %s\n", deps[i]);
+      g_strfreev (deps);
+    }
+}
+
+gint
+main (gint   argc,
+      gchar *argv[])
+{
+  gint status = EXIT_SUCCESS;
+
+  GError *error = NULL;
+  GITypelib *typelib = NULL;
+
+  gchar *version = NULL;
+  gboolean opt_shlibs = FALSE;
+  gboolean opt_typelibs = FALSE;
+  GStrv namespaces = NULL;
+  const gchar *namespace = NULL;
+  const GOptionEntry options[] = {
+    { "version", 0, 0, G_OPTION_ARG_STRING, &version, "Version", "VERSION" },
+    { "print-shlibs", 0, 0, G_OPTION_ARG_NONE, &opt_shlibs, "List the shared libraries the typelib requires" },
+    { "print-typelibs", 0, 0, G_OPTION_ARG_NONE, &opt_typelibs, "List other typelibs the inspected typelib requires" },
+    { G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_STRING_ARRAY, &namespaces, "The typelib to inspect", "NAMESPACE" },
+    { NULL },
+  };
+
+  g_autoptr(GOptionContext) context = g_option_context_new ("- Inspect GI typelib");
+  g_option_context_add_main_entries (context, options, NULL);
+  if (!g_option_context_parse (context, &argc, &argv, &error))
+    {
+      status = EXIT_FAILURE;
+      g_printerr ("Failed to parse command line options: %s\n", error->message);
+      goto out;
+    }
+
+  if (!namespaces)
+    {
+      status = EXIT_FAILURE;
+      g_printerr ("Please specify at least one namespace\n");
+      goto out;
+    }
+
+  if (g_strv_length (namespaces) > 1)
+    {
+      status = EXIT_FAILURE;
+      g_printerr ("Please specify only one namespace\n");
+      goto out;
+    }
+  namespace = namespaces[0];
+
+  if (!opt_shlibs && !opt_typelibs)
+    {
+      status = EXIT_FAILURE;
+      g_printerr ("Please specify --print-shlibs, --print-typelibs or both.\n");
+      goto out;
+    }
+
+  typelib = g_irepository_require (NULL, namespace, version, 0, &error);
+  if (!typelib)
+    {
+      status = EXIT_FAILURE;
+      g_printerr ("Failed to load typelib: %s\n", error->message);
+      goto out;
+    }
+
+  if (opt_shlibs)
+    print_shlibs (namespace);
+  if (opt_typelibs)
+    print_typelibs (namespace);
+
+out:
+  if (error)
+    g_error_free (error);
+  if (typelib)
+    g_typelib_free (typelib);
+  g_strfreev (namespaces);
+  g_free (version);
+
+  return status;
+}