自动缩进

这非常方便，特别是如果正在使用Vim进行快速代码编辑，甚至进行长时间的编码会话。强制执行特定的缩进样式。

在~/.vimrc文件中，添加以下选项：

syntax enable
set smartindent
set tabstop=4
set shiftwidth=4
set expandtab

新行将自动缩进，花括号将自动对齐。

保存时自动缩进

要在保存时自动缩进文件，请将此添加到您的vimrc中：

augroup autoindent
    au!
    autocmd BufWritePre * :normal migg=G`i
augroup End

如果只想对某些文件（例如sss文件）执行此操作，您可以更改正则表达式：

autocmd BufWritePre * :normal migg=G`i

到

autocmd BufWritePre *.scss :normal migg=G`i

操作方式

• autocmd BufWritePre specifies this is a command to be executed automatically before writing the buffer to file.
• '* matches the files to run this auto-command on. If we want only text files, use *.txt, or only html files, use *.html, etc.
• :normal says to execute the following command in normal mode
• mi puts a mark on the current line, and saves it in “i”.
  gg goes to the top of the file
• = is the indentation command, a motion is needed following the = command
• G tells the = command to auto-indent to the bottom of the file
• `i says to go to the mark stored in i
• augroup and au! are for good practive

要查看有关标记的更多信息

http://vim.wikia.com/wiki/Using_marks

要了解有关自动命令的更多信息

http://vimdoc.sourceforge.net/htmldoc/autocmd.html
http://learnvimscriptthehardway.stevelosh.com/chapters/12.html

要了解为什么它包含在 augroup 中

http://learnvimscriptthehardway.stevelosh.com/chapters/14.html

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