[gnome-builder] build-system: add CFLAGS/VALAFLAGS for fallback build system

[Christian Hergert <chergert src gnome org>]

commit a64ae7b6adbb245a2fee3cd16549fbfbd7a7af67
Author: Christian Hergert <christian hergert me>
Date:   Thu Apr 28 17:36:29 2016 -0700

    build-system: add CFLAGS/VALAFLAGS for fallback build system
    
    If you are using the fallback directory build system, this lets you
    specify CFLAGS, CXXFLAGS, or VALAFLAGS in your build configuration.
    
    Doing so, will prime the semantic compiler engines with what the need to
    resolve includes and packages.

 libide/directory/ide-directory-build-system.c |   83 ++++++++++++++++++++++++-
 1 files changed, 81 insertions(+), 2 deletions(-)
---
diff --git a/libide/directory/ide-directory-build-system.c b/libide/directory/ide-directory-build-system.c
index 53e17a7..1445c23 100644
--- a/libide/directory/ide-directory-build-system.c
+++ b/libide/directory/ide-directory-build-system.c
@@ -18,6 +18,8 @@
 
 #include <glib/gi18n.h>
 
+#include "ide-configuration.h"
+#include "ide-configuration-manager.h"
 #include "ide-context.h"
 #include "ide-directory-build-system.h"
 #include "ide-project.h"
@@ -30,14 +32,15 @@ struct _IdeDirectoryBuildSystem
   GFile     *project_file;
 };
 
-static void async_initiable_init (GAsyncInitableIface *iface);
+static void async_initiable_init (GAsyncInitableIface     *iface);
+static void build_system_init    (IdeBuildSystemInterface *iface);
 
 G_DEFINE_TYPE_EXTENDED (IdeDirectoryBuildSystem,
                         ide_directory_build_system,
                         IDE_TYPE_OBJECT,
                         0,
                         G_IMPLEMENT_INTERFACE (G_TYPE_ASYNC_INITABLE, async_initiable_init)
-                        G_IMPLEMENT_INTERFACE (IDE_TYPE_BUILD_SYSTEM, NULL))
+                        G_IMPLEMENT_INTERFACE (IDE_TYPE_BUILD_SYSTEM, build_system_init))
 
 enum {
   PROP_0,
@@ -162,3 +165,79 @@ async_initiable_init (GAsyncInitableIface *iface)
   iface->init_async = ide_directory_build_system_init_async;
   iface->init_finish = ide_directory_build_system_init_finish;
 }
+
+static void
+ide_directory_build_system_get_build_flags_async (IdeBuildSystem      *build_system,
+                                                  IdeFile             *file,
+                                                  GCancellable        *cancellable,
+                                                  GAsyncReadyCallback  callback,
+                                                  gpointer             user_data)
+{
+  IdeDirectoryBuildSystem *self = (IdeDirectoryBuildSystem *)build_system;
+  g_autoptr(GTask) task = NULL;
+  IdeConfigurationManager *configmgr;
+  GtkSourceLanguage *language;
+  IdeConfiguration *config;
+  IdeContext *context;
+  const gchar *env = NULL;
+  const gchar *id;
+
+  g_assert (IDE_IS_DIRECTORY_BUILD_SYSTEM (self));
+  g_assert (IDE_IS_FILE (file));
+  g_assert (!cancellable || G_IS_CANCELLABLE (cancellable));
+
+  task = g_task_new (self, cancellable, callback, user_data);
+
+  context = ide_object_get_context (IDE_OBJECT (build_system));
+  configmgr = ide_context_get_configuration_manager (context);
+  config = ide_configuration_manager_get_current (configmgr);
+
+  language = ide_file_get_language (file);
+
+  if (config == NULL || language == NULL)
+    goto failure;
+
+  id = gtk_source_language_get_id (language);
+
+  if (ide_str_equal0 (id, "c") || ide_str_equal0 (id, "chdr"))
+    env = ide_configuration_getenv (config, "CFLAGS");
+  else if (ide_str_equal0 (id, "cpp") || ide_str_equal0 (id, "cpphdr"))
+    env = ide_configuration_getenv (config, "CXXFLAGS");
+  else if (ide_str_equal0 (id, "vala"))
+    env = ide_configuration_getenv (config, "VALAFLAGS");
+
+  if (env != NULL)
+    {
+      gchar **flags = NULL;
+      gint argc;
+
+      if (g_shell_parse_argv (env, &argc, &flags, NULL))
+        {
+          g_task_return_pointer (task, flags, (GDestroyNotify)g_strfreev);
+          return;
+        }
+    }
+
+failure:
+  g_task_return_pointer (task, g_new0 (gchar*, 1), (GDestroyNotify)g_strfreev);
+}
+
+static gchar **
+ide_directory_build_system_get_build_flags_finish (IdeBuildSystem  *build_system,
+                                                   GAsyncResult    *result,
+                                                   GError         **error)
+{
+  GTask *task = (GTask *)result;
+
+  g_assert (IDE_IS_DIRECTORY_BUILD_SYSTEM (build_system));
+  g_assert (G_IS_TASK (task));
+
+  return g_task_propagate_pointer (task, error);
+}
+
+static void
+build_system_init (IdeBuildSystemInterface *iface)
+{
+  iface->get_build_flags_async = ide_directory_build_system_get_build_flags_async;
+  iface->get_build_flags_finish = ide_directory_build_system_get_build_flags_finish;
+}