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[gnome-builder] meson: add build target provider for meson

commit 33b8a9b1eb123d1c45da1a58c715846c386809c9
Author: Christian Hergert <chergert redhat com>
Date:   Sun Nov 19 20:46:37 2017 -0800

    meson: add build target provider for meson

 .../meson/gbp-meson-build-target-provider.c        |  403 ++++++++++++++++++++
 .../meson/gbp-meson-build-target-provider.h        |   29 ++
 src/plugins/meson/meson-plugin.c                   |    2 +
 src/plugins/meson/meson.build                      |    2 +
 4 files changed, 436 insertions(+), 0 deletions(-)
---
diff --git a/src/plugins/meson/gbp-meson-build-target-provider.c 
b/src/plugins/meson/gbp-meson-build-target-provider.c
new file mode 100644
index 0000000..ef2340c
--- /dev/null
+++ b/src/plugins/meson/gbp-meson-build-target-provider.c
@@ -0,0 +1,403 @@
+/* gbp-meson-build-target-provider.c
+ *
+ * Copyright (C) 2017 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/>.
+ */
+
+#define G_LOG_DOMAIN "gbp-meson-build-target-provider"
+
+#include <json-glib/json-glib.h>
+
+#include "gbp-meson-build-target.h"
+#include "gbp-meson-build-target-provider.h"
+
+struct _GbpMesonBuildTargetProvider
+{
+  IdeObject parent_instance;
+};
+
+static IdeSubprocessLauncher *
+create_launcher (IdeContext  *context,
+                 GError     **error)
+{
+  IdeBuildPipeline *pipeline;
+  IdeBuildManager *build_manager;
+
+  g_assert (IDE_IS_CONTEXT (context));
+  g_assert (error == NULL || *error == NULL);
+
+  build_manager = ide_context_get_build_manager (context);
+  pipeline = ide_build_manager_get_pipeline (build_manager);
+
+  if (pipeline == NULL)
+    {
+      g_set_error (error,
+                   G_IO_ERROR,
+                   G_IO_ERROR_FAILED,
+                   "Pipeline is not ready, cannot create launcher");
+      return NULL;
+    }
+
+  return ide_build_pipeline_create_launcher (pipeline, error);
+}
+
+static void
+gbp_meson_build_target_provider_communicate_cb2 (GObject      *object,
+                                                 GAsyncResult *result,
+                                                 gpointer      user_data)
+{
+  IdeSubprocess *subprocess = (IdeSubprocess *)object;
+  GbpMesonBuildTargetProvider *self;
+  g_autoptr(GTask) task = user_data;
+  g_autoptr(GError) error = NULL;
+  g_autoptr(JsonParser) parser = NULL;
+  g_autofree gchar *stdout_buf = NULL;
+  JsonObjectIter iter;
+  const gchar *key;
+  IdeContext *context;
+  JsonObject *obj;
+  JsonNode *root;
+  JsonNode *value;
+
+  g_assert (IDE_IS_SUBPROCESS (subprocess));
+  g_assert (G_IS_ASYNC_RESULT (result));
+  g_assert (G_IS_TASK (task));
+
+  if (!ide_subprocess_communicate_utf8_finish (subprocess, result, &stdout_buf, NULL, &error))
+    {
+      g_task_return_error (task, g_steal_pointer (&error));
+      return;
+    }
+
+  self = g_task_get_source_object (task);
+  context = ide_object_get_context (IDE_OBJECT (self));
+
+  parser = json_parser_new ();
+
+  if (!json_parser_load_from_data (parser, stdout_buf, -1, &error))
+    {
+      g_task_return_error (task, g_steal_pointer (&error));
+      return;
+    }
+
+  if (NULL == (root = json_parser_get_root (parser)) ||
+      !JSON_NODE_HOLDS_OBJECT (root) ||
+      NULL == (obj = json_node_get_object (root)))
+    {
+      g_task_return_new_error (task,
+                               G_IO_ERROR,
+                               G_IO_ERROR_INVALID_DATA,
+                               "Invalid JSON received from meson introspect");
+      return;
+    }
+
+  json_object_iter_init (&iter, obj);
+
+  while (json_object_iter_next (&iter, &key, &value))
+    {
+      const gchar *path;
+      g_autofree gchar *dir = NULL;
+
+      if (!JSON_NODE_HOLDS_VALUE (value) ||
+          NULL == (path = json_node_get_string (value)))
+        continue;
+
+      dir = g_path_get_dirname (path);
+
+      if (dir != NULL && g_str_has_suffix (dir, "/bin"))
+        {
+          g_autofree gchar *name = NULL;
+          g_autoptr(GPtrArray) ret = NULL;
+          g_autoptr(GFile) gdir = NULL;
+
+          gdir = g_file_new_for_path (dir);
+          name = g_path_get_basename (path);
+
+          /* We only need one result */
+          ret = g_ptr_array_new_with_free_func (g_object_unref);
+          g_ptr_array_add (ret, gbp_meson_build_target_new (context, gdir, name));
+          g_task_return_pointer (task, g_steal_pointer (&ret), (GDestroyNotify)g_ptr_array_unref);
+
+          return;
+        }
+    }
+
+  g_task_return_new_error (task,
+                           G_IO_ERROR,
+                           G_IO_ERROR_FAILED,
+                           "Failed to locate any build targets");
+}
+
+static void
+gbp_meson_build_target_provider_communicate_cb (GObject      *object,
+                                                GAsyncResult *result,
+                                                gpointer      user_data)
+{
+  IdeSubprocess *subprocess = (IdeSubprocess *)object;
+  GbpMesonBuildTargetProvider *self;
+  g_autofree gchar *stdout_buf = NULL;
+  g_autoptr(GTask) task = user_data;
+  g_autoptr(JsonParser) parser = NULL;
+  g_autoptr(IdeSubprocessLauncher) launcher = NULL;
+  g_autoptr(IdeSubprocess) all_subprocess = NULL;
+  g_autoptr(GError) error = NULL;
+  g_autoptr(GPtrArray) ret = NULL;
+  IdeBuildPipeline *pipeline;
+  IdeBuildManager *build_manager;
+  GCancellable *cancellable;
+  IdeContext *context;
+  JsonArray *array;
+  JsonNode *root;
+  gboolean found_bindir = FALSE;
+  guint len;
+
+  g_assert (IDE_IS_SUBPROCESS (subprocess));
+  g_assert (G_IS_ASYNC_RESULT (result));
+  g_assert (G_IS_TASK (task));
+
+  if (!ide_subprocess_communicate_utf8_finish (subprocess, result, &stdout_buf, NULL, &error))
+    {
+      g_task_return_error (task, g_steal_pointer (&error));
+      return;
+    }
+
+  /*
+   * The output from meson introspect --targets is a JSON formatted array
+   * of objects containing target information.
+   */
+
+  parser = json_parser_new ();
+
+  if (!json_parser_load_from_data (parser, stdout_buf, -1, &error))
+    {
+      g_task_return_error (task, g_steal_pointer (&error));
+      return;
+    }
+
+  if (NULL == (root = json_parser_get_root (parser)) ||
+      !JSON_NODE_HOLDS_ARRAY (root) ||
+      NULL == (array = json_node_get_array (root)))
+    {
+      g_task_return_new_error (task,
+                               G_IO_ERROR,
+                               G_IO_ERROR_INVALID_DATA,
+                               "Invalid JSON received from meson introspect");
+      return;
+    }
+
+  self = g_task_get_source_object (task);
+  context = ide_object_get_context (IDE_OBJECT (self));
+
+  len = json_array_get_length (array);
+  ret = g_ptr_array_new_with_free_func (g_object_unref);
+
+  for (guint i = 0; i < len; i++)
+    {
+      JsonNode *element = json_array_get_element (array, i);
+      const gchar *name;
+      const gchar *filename;
+      const gchar *type;
+      JsonObject *obj;
+      JsonNode *member;
+      gboolean installed;
+
+      if (JSON_NODE_HOLDS_OBJECT (element) &&
+          NULL != (obj = json_node_get_object (element)) &&
+          NULL != (member = json_object_get_member (obj, "name")) &&
+          JSON_NODE_HOLDS_VALUE (member) &&
+          NULL != (name = json_node_get_string (member)) &&
+          NULL != (member = json_object_get_member (obj, "install_filename")) &&
+          JSON_NODE_HOLDS_VALUE (member) &&
+          NULL != (filename = json_node_get_string (member)) &&
+          NULL != (member = json_object_get_member (obj, "type")) &&
+          JSON_NODE_HOLDS_VALUE (member) &&
+          NULL != (type = json_node_get_string (member)) &&
+          NULL != (member = json_object_get_member (obj, "installed")) &&
+          JSON_NODE_HOLDS_VALUE (member) &&
+          TRUE == (installed = json_node_get_boolean (member)))
+        {
+          g_autoptr(IdeBuildTarget) target = NULL;
+          g_autofree gchar *install_dir = NULL;
+          g_autofree gchar *base = NULL;
+          g_autofree gchar *name_of_dir = NULL;
+          g_autoptr(GFile) dir = NULL;
+
+          install_dir = g_path_get_dirname (filename);
+          name_of_dir = g_path_get_basename (install_dir);
+
+          g_debug ("Found target %s", name);
+
+          base = g_path_get_basename (filename);
+          dir = g_file_new_for_path (install_dir);
+
+          target = gbp_meson_build_target_new (context, dir, base);
+
+          found_bindir |= ide_str_equal0 (name_of_dir, "bin");
+
+          /*
+           * Until Builder supports selecting a target to run, we need to prefer
+           * bindir targets over other targets.
+           */
+          if (ide_str_equal0 (name_of_dir, "bin") && ide_str_equal0 (type, "executable"))
+            g_ptr_array_insert (ret, 0, g_steal_pointer (&target));
+          else
+            g_ptr_array_add (ret, g_steal_pointer (&target));
+        }
+    }
+
+  /*
+   * If we didn't find a target while processing the targets, we need to scan
+   * for all installed targets to locate a potential script such as python/gjs.
+   */
+
+  if (ret->len > 0 && found_bindir)
+    {
+      g_task_return_pointer (task, g_steal_pointer (&ret), (GDestroyNotify)g_ptr_array_unref);
+      return;
+    }
+
+  launcher = create_launcher (context, &error);
+
+  if (launcher == NULL)
+    {
+      g_task_return_error (task, g_steal_pointer (&error));
+      return;
+    }
+
+  context = ide_object_get_context (IDE_OBJECT (self));
+  build_manager = ide_context_get_build_manager (context);
+  pipeline = ide_build_manager_get_pipeline (build_manager);
+  cancellable = g_task_get_cancellable (task);
+
+  ide_subprocess_launcher_push_argv (launcher, "meson");
+  ide_subprocess_launcher_push_argv (launcher, "introspect");
+  ide_subprocess_launcher_push_argv (launcher, "--installed");
+  ide_subprocess_launcher_push_argv (launcher, ide_build_pipeline_get_builddir (pipeline));
+
+  all_subprocess = ide_subprocess_launcher_spawn (launcher, cancellable, &error);
+
+  if (all_subprocess == NULL)
+    {
+      g_task_return_error (task, g_steal_pointer (&error));
+      return;
+    }
+
+  ide_subprocess_communicate_utf8_async (all_subprocess,
+                                         NULL,
+                                         cancellable,
+                                         gbp_meson_build_target_provider_communicate_cb2,
+                                         g_steal_pointer (&task));
+}
+
+static void
+gbp_meson_build_target_provider_get_targets_async (IdeBuildTargetProvider *provider,
+                                                   GCancellable           *cancellable,
+                                                   GAsyncReadyCallback     callback,
+                                                   gpointer                user_data)
+{
+  GbpMesonBuildTargetProvider *self = (GbpMesonBuildTargetProvider *)provider;
+  g_autoptr(IdeSubprocessLauncher) launcher = NULL;
+  g_autoptr(IdeSubprocess) subprocess = NULL;
+  g_autoptr(GError) error = NULL;
+  g_autoptr(GTask) task = NULL;
+  IdeBuildPipeline *pipeline;
+  IdeBuildManager *build_manager;
+  IdeContext *context;
+
+  IDE_ENTRY;
+
+  g_assert (GBP_IS_MESON_BUILD_TARGET_PROVIDER (self));
+  g_assert (!cancellable || G_IS_CANCELLABLE (cancellable));
+
+  task = g_task_new (self, cancellable, callback, user_data);
+  g_task_set_source_tag (task, gbp_meson_build_target_provider_get_targets_async);
+  g_task_set_priority (task, G_PRIORITY_LOW);
+
+  context = ide_object_get_context (IDE_OBJECT (self));
+  build_manager = ide_context_get_build_manager (context);
+  pipeline = ide_build_manager_get_pipeline (build_manager);
+
+  if (pipeline == NULL)
+    {
+      g_task_return_new_error (task,
+                               G_IO_ERROR,
+                               G_IO_ERROR_FAILED,
+                               "Build pipeline is not ready, cannot extract targets");
+      IDE_EXIT;
+    }
+
+  launcher = create_launcher (context, &error);
+
+  if (launcher == NULL)
+    {
+      g_task_return_error (task, g_steal_pointer (&error));
+      IDE_EXIT;
+    }
+
+  ide_subprocess_launcher_push_argv (launcher, "meson");
+  ide_subprocess_launcher_push_argv (launcher, "introspect");
+  ide_subprocess_launcher_push_argv (launcher, "--targets");
+
+  subprocess = ide_subprocess_launcher_spawn (launcher, cancellable, &error);
+
+  if (subprocess == NULL)
+    {
+      g_task_return_error (task, g_steal_pointer (&error));
+      IDE_EXIT;
+    }
+
+  ide_subprocess_communicate_utf8_async (subprocess,
+                                         NULL,
+                                         cancellable,
+                                         gbp_meson_build_target_provider_communicate_cb,
+                                         g_steal_pointer (&task));
+
+  IDE_EXIT;
+}
+
+static GPtrArray *
+gbp_meson_build_target_provider_get_targets_finish (IdeBuildTargetProvider  *provider,
+                                                    GAsyncResult            *result,
+                                                    GError                 **error)
+{
+  g_assert (GBP_IS_MESON_BUILD_TARGET_PROVIDER (provider));
+  g_assert (G_IS_TASK (result));
+  g_assert (g_task_is_valid (G_TASK (result), provider));
+
+  return g_task_propagate_pointer (G_TASK (result), error);
+}
+
+static void
+build_target_provider_iface_init (IdeBuildTargetProviderInterface *iface)
+{
+  iface->get_targets_async = gbp_meson_build_target_provider_get_targets_async;
+  iface->get_targets_finish = gbp_meson_build_target_provider_get_targets_finish;
+}
+
+G_DEFINE_TYPE_WITH_CODE (GbpMesonBuildTargetProvider,
+                         gbp_meson_build_target_provider,
+                         IDE_TYPE_OBJECT,
+                         G_IMPLEMENT_INTERFACE (IDE_TYPE_BUILD_TARGET_PROVIDER,
+                                                build_target_provider_iface_init))
+
+static void
+gbp_meson_build_target_provider_class_init (GbpMesonBuildTargetProviderClass *klass)
+{
+}
+
+static void
+gbp_meson_build_target_provider_init (GbpMesonBuildTargetProvider *self)
+{
+}
diff --git a/src/plugins/meson/gbp-meson-build-target-provider.h 
b/src/plugins/meson/gbp-meson-build-target-provider.h
new file mode 100644
index 0000000..dff0e25
--- /dev/null
+++ b/src/plugins/meson/gbp-meson-build-target-provider.h
@@ -0,0 +1,29 @@
+/* gbp-meson-build-target-provider.h
+ *
+ * Copyright (C) 2017 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/>.
+ */
+
+#pragma once
+
+#include <ide.h>
+
+G_BEGIN_DECLS
+
+#define GBP_TYPE_MESON_BUILD_TARGET_PROVIDER (gbp_meson_build_target_provider_get_type())
+
+G_DECLARE_FINAL_TYPE (GbpMesonBuildTargetProvider, gbp_meson_build_target_provider, GBP, 
MESON_BUILD_TARGET_PROVIDER, IdeObject)
+
+G_END_DECLS
diff --git a/src/plugins/meson/meson-plugin.c b/src/plugins/meson/meson-plugin.c
index 7090063..6f5b047 100644
--- a/src/plugins/meson/meson-plugin.c
+++ b/src/plugins/meson/meson-plugin.c
@@ -20,6 +20,7 @@
 #include <ide.h>
 
 #include "gbp-meson-build-system.h"
+#include "gbp-meson-build-target-provider.h"
 #include "gbp-meson-pipeline-addin.h"
 #include "gbp-meson-test-provider.h"
 
@@ -28,5 +29,6 @@ gbp_meson_register_types (PeasObjectModule *module)
 {
   peas_object_module_register_extension_type (module, IDE_TYPE_BUILD_PIPELINE_ADDIN, 
GBP_TYPE_MESON_PIPELINE_ADDIN);
   peas_object_module_register_extension_type (module, IDE_TYPE_BUILD_SYSTEM, GBP_TYPE_MESON_BUILD_SYSTEM);
+  peas_object_module_register_extension_type (module, IDE_TYPE_BUILD_TARGET_PROVIDER, 
GBP_TYPE_MESON_BUILD_TARGET_PROVIDER);
   peas_object_module_register_extension_type (module, IDE_TYPE_TEST_PROVIDER, GBP_TYPE_MESON_TEST_PROVIDER);
 }
diff --git a/src/plugins/meson/meson.build b/src/plugins/meson/meson.build
index 44c3b92..5275635 100644
--- a/src/plugins/meson/meson.build
+++ b/src/plugins/meson/meson.build
@@ -12,6 +12,8 @@ meson_sources = [
   'gbp-meson-build-system.h',
   'gbp-meson-build-target.c',
   'gbp-meson-build-target.h',
+  'gbp-meson-build-target-provider.c',
+  'gbp-meson-build-target-provider.h',
   'gbp-meson-pipeline-addin.c',
   'gbp-meson-pipeline-addin.h',
   'gbp-meson-test-provider.c',
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