[gnome-shell] Split off the extension importing stuff into a new library, 'ShellJS'

[Jasper St. Pierre <jstpierre src gnome org>]

commit b2f33e28956b701c55f5fcb67de6cfc51c9ef151
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Wed Jan 18 19:41:07 2012 -0500

    Split off the extension importing stuff into a new library, 'ShellJS'
    
    This allows us to create a separate utility to import things from
    shell extensions that does not have the entire Shell stack built up
    
    https://bugzilla.gnome.org/show_bug.cgi?id=668429

 configure.ac             |    1 +
 js/ui/extensionSystem.js |    3 +-
 src/Makefile.am          |   26 ++++++++++++++-
 src/shell-global.c       |   64 ------------------------------------
 src/shell-global.h       |    6 ---
 src/shell-js.c           |   81 ++++++++++++++++++++++++++++++++++++++++++++++
 src/shell-js.h           |   16 +++++++++
 7 files changed, 125 insertions(+), 72 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 1e03042..33e79db 100644
--- a/configure.ac
+++ b/configure.ac
@@ -117,6 +117,7 @@ AC_CHECK_FUNCS(JS_NewGlobalObject XFixesCreatePointerBarrier)
 CFLAGS=$saved_CFLAGS
 LIBS=$saved_LIBS
 
+PKG_CHECK_MODULES(GNOME_SHELL_JS, glib-2.0 gjs-internals-1.0 >= $GJS_MIN_VERSION)
 PKG_CHECK_MODULES(ST, clutter-1.0 gtk+-3.0 libcroco-0.6 >= 0.6.2 gnome-desktop-3.0 >= 2.90.0 x11)
 PKG_CHECK_MODULES(TRAY, gtk+-3.0)
 PKG_CHECK_MODULES(GVC, libpulse libpulse-mainloop-glib gobject-2.0)
diff --git a/js/ui/extensionSystem.js b/js/ui/extensionSystem.js
index 9aadb3a..23470e1 100644
--- a/js/ui/extensionSystem.js
+++ b/js/ui/extensionSystem.js
@@ -8,6 +8,7 @@ const GLib = imports.gi.GLib;
 const Gio = imports.gi.Gio;
 const St = imports.gi.St;
 const Shell = imports.gi.Shell;
+const ShellJS = imports.gi.ShellJS;
 const Soup = imports.gi.Soup;
 
 const Config = imports.misc.config;
@@ -388,7 +389,7 @@ function loadExtension(dir, type, enabled) {
     let extensionModule;
     let extensionState = null;
     try {
-        global.add_extension_importer('imports.ui.extensionSystem.extensions', meta.uuid, dir.get_path());
+        ShellJS.add_extension_importer('imports.ui.extensionSystem.extensions', meta.uuid, dir.get_path());
         extensionModule = extensions[meta.uuid].extension;
     } catch (e) {
         if (stylesheetPath != null)
diff --git a/src/Makefile.am b/src/Makefile.am
index 6ec1f06..a46d779 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -86,7 +86,7 @@ gnome_shell_cflags =				\
 	-DJSDIR=\"$(pkgdatadir)/js\"
 
 privlibdir = $(pkglibdir)
-privlib_LTLIBRARIES = libgnome-shell.la
+privlib_LTLIBRARIES = libgnome-shell.la libgnome-shell-js.la
 
 shell_built_sources = \
 	shell-enum-types.h \
@@ -182,6 +182,23 @@ EXTRA_DIST += test-gapplication.js
 
 ########################################
 
+libgnome_shell_js_la_SOURCES =		\
+	shell-js.h			\
+	shell-js.c			\
+	$(NULL)
+
+libgnome_shell_js_la_LIBADD =		\
+	$(GNOME_SHELL_JS_LIBS)		\
+	$(NULL)
+
+libgnome_shell_js_la_LDFLAGS =		\
+	-avoid-version
+
+libgnome_shell_js_la_CPPFLAGS =		\
+	$(GNOME_SHELL_JS_CFLAGS)
+
+########################################
+
 shell_recorder_sources =        \
 	shell-recorder.c	\
 	shell-recorder.h
@@ -275,6 +292,13 @@ Shell_0_1_gir_SCANNERFLAGS = --include-uninstalled=$(builddir)/St-1.0.gir \
 INTROSPECTION_GIRS += Shell-0.1.gir
 CLEANFILES += Shell-0.1.gir
 
+ShellJS-0.1.gir: libgnome-shell-js.la
+ShellJS_0_1_gir_CFLAGS = $(libgnome_shell_la_CPPFLAGS) -I $(srcdir)
+ShellJS_0_1_gir_LIBS = libgnome-shell-js.la
+ShellJS_0_1_gir_FILES = $(libgnome_shell_js_la_SOURCES)
+INTROSPECTION_GIRS += ShellJS-0.1.gir
+CLEANFILES += ShellJS-0.1.gir
+
 St-1.0.gir: libst-1.0.la
 St_1_0_gir_INCLUDES = Clutter-1.0 Gtk-3.0
 St_1_0_gir_CFLAGS = $(st_cflags) -DST_COMPILATION
diff --git a/src/shell-global.c b/src/shell-global.c
index e41a883..2e7e200 100644
--- a/src/shell-global.c
+++ b/src/shell-global.c
@@ -1177,70 +1177,6 @@ shell_global_destroy_pointer_barrier (ShellGlobal *global, guint32 barrier)
 #endif
 }
 
-
-/**
- * shell_global_add_extension_importer:
- * @target_object_script: JavaScript code evaluating to a target object
- * @target_property: Name of property to use for importer
- * @directory: Source directory:
- * @error: A #GError
- *
- * This function sets a property named @target_property on the object
- * resulting from the evaluation of @target_object_script code, which
- * acts as a GJS importer for directory @directory.
- *
- * Returns: %TRUE on success
- */
-gboolean
-shell_global_add_extension_importer (ShellGlobal *global,
-                                     const char  *target_object_script,
-                                     const char  *target_property,
-                                     const char  *directory,
-                                     GError     **error)
-{
-  jsval target_object;
-  JSContext *context = gjs_context_get_native_context (global->js_context);
-  char *search_path[2] = { 0, 0 };
-
-  JS_BeginRequest (context);
-
-  // This is a bit of a hack; ideally we'd be able to pass our target
-  // object directly into this function, but introspection doesn't
-  // support that at the moment.  Instead evaluate a string to get it.
-  if (!JS_EvaluateScript(context,
-                         JS_GetGlobalObject(context),
-                         target_object_script,
-                         strlen (target_object_script),
-                         "<target_object_script>",
-                         0,
-                         &target_object))
-    {
-      char *message;
-      gjs_log_exception(context,
-                        &message);
-      g_set_error(error,
-                  G_IO_ERROR,
-                  G_IO_ERROR_FAILED,
-                  "%s", message ? message : "(unknown)");
-      g_free(message);
-      goto out_error;
-    }
-
-  if (!JSVAL_IS_OBJECT (target_object))
-    {
-      g_error ("shell_global_add_extension_importer: invalid target object");
-      goto out_error;
-    }
-
-  search_path[0] = (char*)directory;
-  gjs_define_importer (context, JSVAL_TO_OBJECT (target_object), target_property, (const char **)search_path, FALSE);
-  JS_EndRequest (context);
-  return TRUE;
- out_error:
-  JS_EndRequest (context);
-  return FALSE;
-}
-
 /* Code to close all file descriptors before we exec; copied from gspawn.c in GLib.
  *
  * Authors: Padraig O'Briain, Matthias Clasen, Lennart Poettering
diff --git a/src/shell-global.h b/src/shell-global.h
index ba87f46..6456c9e 100644
--- a/src/shell-global.h
+++ b/src/shell-global.h
@@ -119,12 +119,6 @@ void shell_global_run_at_leisure (ShellGlobal          *global,
 
 
 /* Misc utilities / Shell API */
-gboolean shell_global_add_extension_importer    (ShellGlobal  *global,
-                                                 const char   *target_object_script,
-                                                 const char   *target_property,
-                                                 const char   *directory,
-                                                 GError      **error);
-
 void     shell_global_sync_pointer              (ShellGlobal  *global);
 
 GAppLaunchContext *
diff --git a/src/shell-js.c b/src/shell-js.c
new file mode 100644
index 0000000..8267fdc
--- /dev/null
+++ b/src/shell-js.c
@@ -0,0 +1,81 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+
+#include "config.h"
+
+#include "shell-js.h"
+
+#include <jsapi.h>
+#include <gio/gio.h>
+#include <gjs/gjs.h>
+#include <gjs/gjs-module.h>
+
+/**
+ * shell_js_add_extension_importer:
+ * @target_object_script: JavaScript code evaluating to a target object
+ * @target_property: Name of property to use for importer
+ * @directory: Source directory:
+ * @error: A #GError
+ *
+ * This function sets a property named @target_property on the object
+ * resulting from the evaluation of @target_object_script code, which
+ * acts as a GJS importer for directory @directory.
+ *
+ * Returns: %TRUE on success
+ */
+gboolean
+shell_js_add_extension_importer (const char  *target_object_script,
+                                 const char  *target_property,
+                                 const char  *directory,
+                                 GError     **error)
+{
+  jsval target_object;
+  GList *contexts;
+  JSContext *context;
+  char *search_path[2] = { 0, 0 };
+  gboolean ret = FALSE;
+
+  /* Take the first GjsContext from all of them --
+   * we should only ever have one context, so this
+   * should be alright. */
+  contexts = gjs_context_get_all ();
+  context = gjs_context_get_native_context (contexts->data);
+  g_list_free_full (contexts, g_object_unref);
+
+  JS_BeginRequest (context);
+
+  /* This is a bit of a hack; ideally we'd be able to pass our target
+   * object directly into this function, but introspection doesn't
+   * support that at the moment.  Instead evaluate a string to get it. */
+  if (!JS_EvaluateScript(context,
+                         JS_GetGlobalObject(context),
+                         target_object_script,
+                         strlen (target_object_script),
+                         "<target_object_script>",
+                         0,
+                         &target_object))
+    {
+      char *message;
+      gjs_log_exception(context,
+                        &message);
+      g_set_error(error,
+                  G_IO_ERROR,
+                  G_IO_ERROR_FAILED,
+                  "%s", message ? message : "(unknown)");
+      g_free(message);
+      goto out;
+    }
+
+  if (!JSVAL_IS_OBJECT (target_object))
+    {
+      g_error ("shell_js_add_extension_importer: invalid target object");
+      goto out;
+    }
+
+  search_path[0] = (char*)directory;
+  gjs_define_importer (context, JSVAL_TO_OBJECT (target_object), target_property, (const char **)search_path, FALSE);
+  ret = TRUE;
+
+ out:
+  JS_EndRequest (context);
+  return ret;
+}
diff --git a/src/shell-js.h b/src/shell-js.h
new file mode 100644
index 0000000..26cbf4d
--- /dev/null
+++ b/src/shell-js.h
@@ -0,0 +1,16 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+#ifndef __SHELL_JS_H__
+#define __SHELL_JS_H__
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+gboolean shell_js_add_extension_importer (const char   *target_object_script,
+                                          const char   *target_property,
+                                          const char   *directory,
+                                          GError      **error);
+
+G_BEGIN_DECLS
+
+#endif /* __SHELL_JS_H__ */