extensions-tool: Add info command

We already support displaying extension details for the list command,
so it's a logical extension to also support showing extension info
for a particular extension (not least because the shell has a
corresponding D-Bus method).

https://gitlab.gnome.org/GNOME/gnome-shell/issues/1234

src/extensions-tool/command-info.c

@@ -0,0 +1,106 @@
+/* commands-info.c
+ *
+ * Copyright 2018 Florian Müllner <fmuellner@gnome.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <glib/gi18n.h>
+#include <gio/gio.h>
+
+#include "commands.h"
+#include "common.h"
+#include "config.h"
+
+static gboolean
+show_extension_info (const char *uuid)
+{
+  g_autoptr (GDBusProxy) proxy = NULL;
+  g_autoptr (GVariant) response = NULL;
+  g_autoptr (GVariant) asv = NULL;
+  g_autoptr (GVariantDict) info = NULL;
+  g_autoptr (GError) error = NULL;
+
+  proxy = get_shell_proxy (&error);
+  if (proxy == NULL)
+    return FALSE;
+
+  response = g_dbus_proxy_call_sync (proxy,
+                                     "GetExtensionInfo",
+                                     g_variant_new ("(s)", uuid),
+                                     0,
+                                     -1,
+                                     NULL,
+                                     &error);
+  if (response == NULL)
+    return FALSE;
+
+  asv = g_variant_get_child_value (response, 0);
+  info = g_variant_dict_new (asv);
+
+  if (!g_variant_dict_contains (info, "uuid"))
+    return FALSE;
+
+  print_extension_info (info, DISPLAY_DETAILED);
+
+  return TRUE;
+}
+
+int
+handle_info (int argc, char *argv[], gboolean do_help)
+{
+  g_autoptr (GOptionContext) context = NULL;
+  g_autoptr (GError) error = NULL;
+  g_auto(GStrv) uuids = NULL;
+  GOptionEntry entries[] = {
+    { .long_name = G_OPTION_REMAINING,
+      .arg_description = "UUID",
+      .arg = G_OPTION_ARG_STRING_ARRAY, .arg_data = &uuids },
+    { NULL }
+  };
+
+  g_set_prgname ("gnome-extensions info");
+
+  context = g_option_context_new (NULL);
+  g_option_context_set_help_enabled (context, FALSE);
+  g_option_context_set_summary (context, _("Show extensions info"));
+  g_option_context_add_main_entries (context, entries, GETTEXT_PACKAGE);
+
+  if (do_help)
+    {
+      show_help (context, NULL);
+      return 0;
+    }
+
+  if (!g_option_context_parse (context, &argc, &argv, &error))
+    {
+      show_help (context, error->message);
+      return 1;
+    }
+
+  if (uuids == NULL)
+    {
+      show_help (context, _("No UUID given"));
+      return 1;
+    }
+  else if (g_strv_length (uuids) > 1)
+    {
+      show_help (context, _("More than one UUID given"));
+      return 1;
+    }
+
+  return show_extension_info (*uuids) ? 0 : 2;
+}

src/extensions-tool/commands.h

@@ -27,6 +27,7 @@ G_BEGIN_DECLS
 int handle_enable     (int argc, char *argv[], gboolean do_help);
 int handle_disable    (int argc, char *argv[], gboolean do_help);
 int handle_list       (int argc, char *argv[], gboolean do_help);
+int handle_info       (int argc, char *argv[], gboolean do_help);
 int handle_create     (int argc, char *argv[], gboolean do_help);
 
 G_END_DECLS

src/extensions-tool/main.c

@@ -159,6 +159,7 @@ usage (void)
   g_printerr ("  enable    %s\n", _("Enable extension"));
   g_printerr ("  disable   %s\n", _("Disable extension"));
   g_printerr ("  list      %s\n", _("List extensions"));
+  g_printerr ("  info      %s\n", _("Show extension info"));
   g_printerr ("  create    %s\n", _("Create extension"));
   g_printerr ("\n");
   g_printerr (_("Use %s to get detailed help.\n"), "“gnome-extensions help COMMAND”");
@@ -219,6 +220,8 @@ main (int argc, char *argv[])
     return handle_disable (argc, argv, do_help);
   else if (g_str_equal (command, "list"))
     return handle_list (argc, argv, do_help);
+  else if (g_str_equal (command, "info"))
+    return handle_info (argc, argv, do_help);
   else if (g_str_equal (command, "create"))
     return handle_create (argc, argv, do_help);
   else

src/extensions-tool/man/gnome-extensions.txt

@@ -19,6 +19,8 @@ SYNOPSIS
 
 *gnome-extensions* disable 'UUID'
 
+*gnome-extensions* info 'UUID'
+
 *gnome-extensions* list ['OPTION'...]
 
 *gnome-extensions* create ['OPTION'...]
@@ -50,6 +52,10 @@ Disables the extension identified by 'UUID'.
 +
 If the extension is not enabled, the command will do nothing.
 
+*info* 'UUID'::
+Show details of the extension identified by 'UUID', including name,
+description and state.
+
 *list* ['OPTION'...]::
 Displays a list of installed extensions.
 +

src/extensions-tool/meson-src.build

@@ -3,6 +3,7 @@ sources = [
   'command-create.c',
   'command-disable.c',
   'command-enable.c',
+  'command-info.c',
   'command-list.c',
   'common.h',
   'main.c'

src/extensions-tool/meson.build

@@ -12,6 +12,7 @@ sources = [
   'command-create.c',
   'command-disable.c',
   'command-enable.c',
+  'command-info.c',
   'command-list.c',
   'main.c'
 ]