[gnome-builder] foundry: add API to track launcher creation

[Christian Hergert <chergert src gnome org>]

commit e2cacef30b9abc324672da78e3b0451da91291c8
Author: Christian Hergert <chergert redhat com>
Date:   Mon Mar 25 16:01:22 2019 -0700

    foundry: add API to track launcher creation
    
    This signal can be used to hook into the launcher creation process and
    modify various settings upfront. For example, adding environment variables
    that are not necessarily in the build configuration.

 src/libide/foundry/ide-pipeline.c | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)
---
diff --git a/src/libide/foundry/ide-pipeline.c b/src/libide/foundry/ide-pipeline.c
index ad64464d0..85100c45e 100644
--- a/src/libide/foundry/ide-pipeline.c
+++ b/src/libide/foundry/ide-pipeline.c
@@ -380,6 +380,7 @@ enum {
   STARTED,
   FINISHED,
   LOADED,
+  LAUNCHER_CREATED,
   N_SIGNALS
 };
 
@@ -1711,6 +1712,29 @@ ide_pipeline_class_init (IdePipelineClass *klass)
                                 G_SIGNAL_RUN_LAST,
                                 NULL, NULL, NULL, NULL,
                                 G_TYPE_NONE, 0);
+
+  /**
+   * IdePipeline::launcher-created:
+   * @self: an #IdePipeline
+   * @launcher: an #IdeSubprocessLauncher
+   *
+   * The "launcher-created" signal is emitted when a new
+   * #IdeSubprocessLauncher is created by the pipeline. This may be useful
+   * to plugins that wan to modify the launcher in a consistent way for all
+   * pipeline consumers.
+   *
+   * Since: 3.34
+   */
+  signals [LAUNCHER_CREATED] =
+    g_signal_new_class_handler ("launcher-created",
+                                G_TYPE_FROM_CLASS (klass),
+                                G_SIGNAL_RUN_LAST,
+                                NULL, NULL, NULL,
+                                g_cclosure_marshal_VOID__OBJECT,
+                                G_TYPE_NONE, 1, IDE_TYPE_SUBPROCESS_LAUNCHER);
+  g_signal_set_va_marshaller (signals [LAUNCHER_CREATED],
+                              G_TYPE_FROM_CLASS (klass),
+                              g_cclosure_marshal_VOID__OBJECTv);
 }
 
 static void
@@ -2865,11 +2889,12 @@ ide_pipeline_get_toolchain (IdePipeline *self)
  */
 IdeSubprocessLauncher *
 ide_pipeline_create_launcher (IdePipeline  *self,
-                                    GError           **error)
+                              GError      **error)
 {
   g_autoptr(IdeSubprocessLauncher) ret = NULL;
   IdeRuntime *runtime;
 
+  g_return_val_if_fail (IDE_IS_MAIN_THREAD (), NULL);
   g_return_val_if_fail (IDE_IS_PIPELINE (self), NULL);
 
   runtime = ide_config_get_runtime (self->config);
@@ -2899,6 +2924,8 @@ ide_pipeline_create_launcher (IdePipeline  *self,
                                          (G_SUBPROCESS_FLAGS_STDERR_PIPE |
                                           G_SUBPROCESS_FLAGS_STDOUT_PIPE));
       ide_config_apply_path (self->config, ret);
+
+      g_signal_emit (self, signals [LAUNCHER_CREATED], 0, ret);
     }
 
   return g_steal_pointer (&ret);