edi_scm: allow stage/unstaging outside of top scm dir.

@fix https://github.com/Enlightenment/edi/issues/16

src/bin/edi_scm_ui.c

@@ -505,6 +505,45 @@ _edi_scm_ui_file_changes_cb(void *data EINA_UNUSED, int type EINA_UNUSED,
    return ECORE_CALLBACK_DONE;
 }
 
+char *
+_edi_scm_engine_root_dir_get(void)
+{
+   Edi_Scm_Engine *engine;
+   char *directory, *engine_root, *path, *tmp;
+
+   engine = edi_scm_engine_get();
+   if (!engine)
+     exit(2 << 1);
+
+   tmp = path = engine_root = NULL;
+
+   directory = strdup(engine->workdir);
+
+   while (directory)
+     {
+        path = edi_path_append(directory, engine->directory);
+        if (ecore_file_exists(path) && ecore_file_is_dir(path))
+          {
+             engine_root = strdup(directory);
+             break;
+          }
+
+        tmp = ecore_file_dir_get(directory);
+        free(directory);
+        directory = tmp;
+        free(path);
+        path = NULL;
+     }
+
+   if (path)
+     free(path);
+
+   if (directory)
+     free(directory);
+
+   return engine_root;
+}
+
 char *
 _edi_scm_ui_workdir_get(void)
 {
@@ -667,6 +706,7 @@ edi_scm_ui_add(Evas_Object *parent)
      exit(1 << 1);
 
    edi_scm = calloc(1, sizeof(Edi_Scm_Ui));
+   engine->workdir = _edi_scm_engine_root_dir_get();
    edi_scm->workdir = engine->workdir;
    edi_scm->monitor = eio_monitor_add(edi_scm->workdir);
    edi_scm->parent = parent;