code: function collapseCurrent() {
          var editor = EditorManager.getFocusedEditor();
          if (!editor) {
              return;
          }
          var cm = editor._codeMirror;
          var cursor = editor.getCursorPos(), i;
          // Move cursor up until a collapsible line is found
          for (i = cursor.line; i >= 0; i--) {
              if (cm.foldCode(i)) {
                  editor.setCursorPos(i);
                  return;
              }
          }
      }
docs: Collapses the code region nearest the current cursor position.
  Nearest is found by searching from the current line and moving up the document until an
  opening code-folding region is found.