[gnome-builder] git: implement list_tags for git vcs backend

[Christian Hergert <chergert src gnome org>]

commit 8bc248ed787ccd54fd010454495ce53adce873c9
Author: Christian Hergert <chergert redhat com>
Date:   Sun Jan 27 19:59:02 2019 -0800

    git: implement list_tags for git vcs backend

 src/plugins/git/gbp-git-tag.c |  82 +++++++++++++++++++++++++++++++++
 src/plugins/git/gbp-git-tag.h |  33 +++++++++++++
 src/plugins/git/gbp-git-vcs.c | 105 ++++++++++++++++++++++++++++++++++++++++++
 src/plugins/git/meson.build   |   1 +
 4 files changed, 221 insertions(+)
---
diff --git a/src/plugins/git/gbp-git-tag.c b/src/plugins/git/gbp-git-tag.c
new file mode 100644
index 000000000..5391f2db8
--- /dev/null
+++ b/src/plugins/git/gbp-git-tag.c
@@ -0,0 +1,82 @@
+/* gbp-git-tag.c
+ *
+ * Copyright 2019 Christian Hergert <chergert redhat com>
+ *
+ * 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
+ */
+
+#define G_LOG_DOMAIN "gbp-git-tag"
+
+#include "config.h"
+
+#include <libide-vcs.h>
+
+#include "gbp-git-tag.h"
+
+struct _GbpGitTag
+{
+  GObject parent_instance;
+  gchar *name;
+};
+
+static gchar *
+gbp_git_tag_get_name (IdeVcsTag *tag)
+{
+  return g_strdup (GBP_GIT_TAG (tag)->name);
+}
+
+static void
+vcs_tag_iface_init (IdeVcsTagInterface *iface)
+{
+  iface->get_name = gbp_git_tag_get_name;
+}
+
+G_DEFINE_TYPE_WITH_CODE (GbpGitTag, gbp_git_tag, G_TYPE_OBJECT,
+                         G_IMPLEMENT_INTERFACE (IDE_TYPE_VCS_TAG, vcs_tag_iface_init))
+
+static void
+gbp_git_tag_finalize (GObject *object)
+{
+  GbpGitTag *self = (GbpGitTag *)object;
+
+  g_clear_pointer (&self->name, g_free);
+
+  G_OBJECT_CLASS (gbp_git_tag_parent_class)->finalize (object);
+}
+
+static void
+gbp_git_tag_class_init (GbpGitTagClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->finalize = gbp_git_tag_finalize;
+}
+
+static void
+gbp_git_tag_init (GbpGitTag *self)
+{
+}
+
+GbpGitTag *
+gbp_git_tag_new (const gchar *name)
+{
+  GbpGitTag *self;
+
+  self = g_object_new (GBP_TYPE_GIT_TAG, NULL);
+  self->name = g_strdup (name);
+
+  return g_steal_pointer (&self);
+}
diff --git a/src/plugins/git/gbp-git-tag.h b/src/plugins/git/gbp-git-tag.h
new file mode 100644
index 000000000..870b36688
--- /dev/null
+++ b/src/plugins/git/gbp-git-tag.h
@@ -0,0 +1,33 @@
+/* gbp-git-tag.h
+ *
+ * Copyright 2019 Christian Hergert <chergert redhat com>
+ *
+ * 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
+ */
+
+#pragma once
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define GBP_TYPE_GIT_TAG (gbp_git_tag_get_type())
+
+G_DECLARE_FINAL_TYPE (GbpGitTag, gbp_git_tag, GBP, GIT_TAG, GObject)
+
+GbpGitTag *gbp_git_tag_new (const gchar *name);
+
+G_END_DECLS
diff --git a/src/plugins/git/gbp-git-vcs.c b/src/plugins/git/gbp-git-vcs.c
index 5c0e7f92b..2627a8117 100644
--- a/src/plugins/git/gbp-git-vcs.c
+++ b/src/plugins/git/gbp-git-vcs.c
@@ -22,7 +22,10 @@
 
 #include "config.h"
 
+#include <stdlib.h>
+
 #include "gbp-git-branch.h"
+#include "gbp-git-tag.h"
 #include "gbp-git-vcs.h"
 #include "gbp-git-vcs-config.h"
 
@@ -543,6 +546,106 @@ gbp_git_vcs_list_branches_finish (IdeVcs        *vcs,
   return ide_task_propagate_pointer (IDE_TASK (result), error);
 }
 
+static gint
+compare_tags (gconstpointer a,
+              gconstpointer b)
+{
+  return g_utf8_collate (*(const gchar **)a, *(const gchar **)b);
+}
+
+static void
+gbp_git_vcs_list_tags_worker (IdeTask      *task,
+                              gpointer      source_object,
+                              gpointer      task_data,
+                              GCancellable *cancellable)
+{
+  GbpGitVcs *self = source_object;
+  g_autoptr(GPtrArray) tags = NULL;
+
+  g_assert (IDE_IS_TASK (task));
+  g_assert (GBP_IS_GIT_VCS (self));
+  g_assert (!cancellable || G_IS_CANCELLABLE (cancellable));
+
+  tags = g_ptr_array_new_with_free_func (g_object_unref);
+
+  ide_object_lock (IDE_OBJECT (self));
+
+  if (self->repository != NULL)
+    {
+      g_autoptr(GgitBranchEnumerator) enumerator = NULL;
+      g_auto(GStrv) names = NULL;
+      g_autoptr(GError) error = NULL;
+
+      if (!(names = ggit_repository_list_tags (self->repository, &error)))
+        {
+          ide_task_return_error (task, g_steal_pointer (&error));
+          goto unlock;
+        }
+
+      qsort (names, g_strv_length (names), sizeof (gchar *), compare_tags);
+
+      for (guint i = 0; names[i] != NULL; i++)
+        g_ptr_array_add (tags, gbp_git_tag_new (names[i]));
+
+      ide_task_return_pointer (task,
+                               g_steal_pointer (&tags),
+                               (GDestroyNotify)g_ptr_array_unref);
+    }
+  else
+    {
+      ide_task_return_new_error (task,
+                                 G_IO_ERROR,
+                                 G_IO_ERROR_FAILED,
+                                 "No repository to access");
+    }
+
+unlock:
+  ide_object_unlock (IDE_OBJECT (self));
+}
+
+static void
+gbp_git_vcs_list_tags_async (IdeVcs              *vcs,
+                             GCancellable        *cancellable,
+                             GAsyncReadyCallback  callback,
+                             gpointer             user_data)
+{
+  GbpGitVcs *self = (GbpGitVcs *)vcs;
+  g_autoptr(IdeTask) task = NULL;
+
+  IDE_ENTRY;
+
+  g_assert (IDE_IS_MAIN_THREAD ());
+  g_assert (GBP_IS_GIT_VCS (self));
+  g_assert (!cancellable || G_IS_CANCELLABLE (cancellable));
+
+  task = ide_task_new (self, cancellable, callback, user_data);
+  ide_task_set_source_tag (task, gbp_git_vcs_list_status_async);
+  ide_task_set_return_on_cancel (task, TRUE);
+
+  ide_object_lock (IDE_OBJECT (self));
+  if (self->repository == NULL)
+    ide_task_return_new_error (task,
+                               G_IO_ERROR,
+                               G_IO_ERROR_FAILED,
+                               "No repository loaded");
+  else
+    ide_task_run_in_thread (task, gbp_git_vcs_list_tags_worker);
+  ide_object_unlock (IDE_OBJECT (self));
+
+  IDE_EXIT;
+}
+
+static GPtrArray *
+gbp_git_vcs_list_tags_finish (IdeVcs        *vcs,
+                              GAsyncResult  *result,
+                              GError       **error)
+{
+  g_return_val_if_fail (GBP_IS_GIT_VCS (vcs), NULL);
+  g_return_val_if_fail (IDE_IS_TASK (result), NULL);
+
+  return ide_task_propagate_pointer (IDE_TASK (result), error);
+}
+
 static void
 gbp_git_vcs_switch_branch_worker (IdeTask      *task,
                                   gpointer      source_object,
@@ -652,6 +755,8 @@ vcs_iface_init (IdeVcsInterface *iface)
   iface->list_status_finish = gbp_git_vcs_list_status_finish;
   iface->list_branches_async = gbp_git_vcs_list_branches_async;
   iface->list_branches_finish = gbp_git_vcs_list_branches_finish;
+  iface->list_tags_async = gbp_git_vcs_list_tags_async;
+  iface->list_tags_finish = gbp_git_vcs_list_tags_finish;
   iface->switch_branch_async = gbp_git_vcs_switch_branch_async;
   iface->switch_branch_finish = gbp_git_vcs_switch_branch_finish;
 }
diff --git a/src/plugins/git/meson.build b/src/plugins/git/meson.build
index 1cd512e99..79dc08181 100644
--- a/src/plugins/git/meson.build
+++ b/src/plugins/git/meson.build
@@ -10,6 +10,7 @@ plugins_sources += files([
   'gbp-git-pipeline-addin.c',
   'gbp-git-remote-callbacks.c',
   'gbp-git-submodule-stage.c',
+  'gbp-git-tag.c',
   'gbp-git-vcs.c',
   'gbp-git-vcs-cloner.c',
   'gbp-git-vcs-config.c',