emacs powerline 项目是什么意思?

what do emacs powerline items mean?

我终于让 emacs powerline 工作了。看起来很不错。不过,我似乎找不到关于它的 any 文档。此屏幕截图中的 - 299 UU-:All 是什么意思

它还能告诉我什么?有文档吗?

--  
Indicates that the buffer has not been changed since the last save
**  
Indicates that the buffer has been changed since the last save
%%  
Indicates that the buffer is read-only (can't be changed)

这里有更多信息 https://kb.iu.edu/d/ablq https://www.nada.kth.se/cgi-bin/info?(emacs)Mode%20Line