make gnome-shell runnable from an install

configure.ac

@@ -76,5 +76,4 @@ AC_OUTPUT([
   js/Makefile
   js/ui/Makefile
   src/Makefile
-  src/gnome-shell
 ])

src/Makefile-taskpanel.am

@@ -14,4 +14,4 @@ gnomeshell_taskpanel_SOURCES =			\
 
 gnomeshell_taskpanel_LDADD = $(TASKPANEL_LIBS)
 
-bin_PROGRAMS += gnomeshell-taskpanel
+libexec_PROGRAMS += gnomeshell-taskpanel

src/Makefile.am

@@ -2,9 +2,22 @@ NULL =
 BUILT_SOURCES =
 CLEANFILES =
 EXTRA_DIST = 
-bin_PROGRAMS =
+libexec_PROGRAMS =
 noinst_LTLIBRARIES = 
 
+bin_SCRIPTS = gnome-shell
+
+gnome-shell: gnome-shell.in
+	sed -e "s|@META_BIN_DIR[@]|$(META_BIN_DIR)|" \
+	    -e "s|@GJS_JS_DIR[@]|$(GJS_JS_DIR)|" \
+	    -e "s|@GJS_JS_NATIVE_DIR[@]|$(GJS_JS_NATIVE_DIR)|" \
+	    -e "s|@libexecdir[@]|$(libexecdir)|" \
+	    -e "s|@libdir[@]|$(libdir)|" \
+	    -e "s|@pkgdatadir[@]|$(pkgdatadir)|" \
+	    $< > $@ && chmod a+x $@
+CLEANFILES += gnome-shell
+EXTRA_DIST += gnome-shell.in
+
 include Makefile-tidy.am
 include Makefile-big.am
 include Makefile-gdmuser.am
@@ -147,6 +160,3 @@ CLEANFILES += Big-1.0.gir
 Big-1.0.typelib: libbig-1.0.la Big-1.0.gir
 	LD_LIBRARY_PATH=$${LD_LIBRARY_PATH:+$$LD_LIBRARY_PATH:}. g-ir-compiler Big-1.0.gir -o $@
 CLEANFILES += Big-1.0.typelib
-
-all-local:
-	chmod a+x gnome-shell

src/gnome-shell.in

@@ -107,16 +107,33 @@ def _get_glx_extensions():
     return (server_glx_extensions, client_glx_extensions, glx_extensions)
 
 def start_shell():
-    # Figure out the path to the plugin when uninstalled
-    src_dir = os.path.dirname(os.path.abspath(sys.argv[0]))
-    top_dir = os.path.dirname(src_dir)
+    bin_dir = os.path.dirname(os.path.abspath(sys.argv[0]))
+    if os.path.exists(os.path.join(bin_dir, 'gnome-shell.in')):
+        running_from_source_tree = True
+        top_dir = os.path.dirname(bin_dir)
         plugin_dir = os.path.join(top_dir, "src")
+        typelib_dir = os.path.join(top_dir, "src")
+        taskpanel_dir = os.path.join(top_dir, "src")
         js_dir = os.path.join(top_dir, "js")
         data_dir = os.path.join(top_dir, "data")
+    else:
+        running_from_source_tree = False
+        js_dir = os.path.join('@pkgdatadir@', 'js')
+        plugin_dir = '@libdir@/metacity/plugins/clutter'
+        taskpanel_dir = '@libexecdir@'
+
+    # Set up environment
+    env = dict(os.environ)
+    env.update({'GNOME_SHELL_JS'      : '@GJS_JS_DIR@:@GJS_JS_NATIVE_DIR@:' + js_dir,
+                'PATH'                : '@META_BIN_DIR@:' + os.environ.get('PATH', '') + ':' + taskpanel_dir,
+                'GNOME_DISABLE_CRASH_DIALOG' : '1'})
+
+    if running_from_source_tree:
+        env.update({'GNOME_SHELL_DATADIR' : data_dir,
+                    'GI_TYPELIB_PATH'     : typelib_dir})
 
     # Work around Ubuntu xulrunner bug,
     # http://bugzilla.gnome.org/show_bug.cgi?id=573413
-    mozjs_ld_library_path = ''
     pkgconfig = subprocess.Popen(['pkg-config', '--variable=sdkdir', 'mozilla-js'],
                                  stdout=subprocess.PIPE)
     mozjs_sdkdir = pkgconfig.communicate()[0].strip()
@@ -124,16 +141,7 @@ def start_shell():
     if pkgconfig.returncode == 0:
         mozjs_libdir = re.sub('-(sdk|devel)', '', mozjs_sdkdir)
         if os.path.exists(mozjs_libdir + '/libmozjs.so'):
-            mozjs_ld_library_path = ':' + mozjs_libdir
-
-    # Set up environment
-    env = dict(os.environ)
-    env.update({'GNOME_SHELL_JS'      : '@GJS_JS_DIR@:@GJS_JS_NATIVE_DIR@:' + js_dir,
-                'GNOME_SHELL_DATADIR' : data_dir,
-                'GI_TYPELIB_PATH'     : plugin_dir,
-                'PATH'                : '@META_BIN_DIR@:' + os.environ.get('PATH', '') + ':' + plugin_dir,
-                'LD_LIBRARY_PATH'     : os.environ.get('LD_LIBRARY_PATH', '') + ':' + plugin_dir + mozjs_ld_library_path,
-                'GNOME_DISABLE_CRASH_DIALOG' : '1'})
+            env['LD_LIBRARY_PATH'] = os.environ.get('LD_LIBRARY_PATH', '') + ':' + mozjs_libdir
 
     if not options.verbose:
         # Unless verbose() is specified, only let gjs show errors and