在VIM下使用gg=G格式化shell代码时，如果代码中有heredoc，经过格式化后会造成代码运行失败。如下：
do
echo "Deploying..."
ssh $USER@$HOST <<-EOF
cd clat
mv client client-bak-`date +%Y%m%d`
tar zxf `basename $TARGET_DEPLOY_ZIP` -C .
exit
EOF
echo ""
格式化后会成这样：
do
echo "Deploying..."
ssh $USER@$HOST <<-EOF
cd clat
mv client client-bak-`date +%Y%m%d`
tar zxf `basename $TARGET_DEPLOY_ZIP` -C .
exit
EOF
echo ""
done
vim对heredoc的代码进行了缩进（四个空格），这样会导致执行出错。
解决：修改vim格式化shell脚本的规则，格式化时忽略heredoc。
将如下脚本保存到.vim/indent/sh.vim:
（来源：http://vim.1045645.n5.nabble.com/bash-heredoc-in-a-for-loop-indented-incorrectly-td1177006.html）
" Vim indent file
" Language: Shell Script
" Maintainer: Nikolai Weibull <[hidden email]>
" Latest Revision: 2006-04-19
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal indentexpr=GetShIndent()
setlocal indentkeys+==then,=do,=else,=elif,=esac,=fi,=fin,=fil,=done,=EOF,=END
setlocal indentkeys-=:,0#
if exists("*GetShIndent")
finish
endif
let s:cpo_save = &cpo
set cpo&vim
function GetShIndent()
let lnum = prevnonblank(v:lnum - 1)
if lnum == 0
return 0
endif
" Add a 'shiftwidth' after if, while, else, case, until, for, function()
" Skip if the line also contains the closure for the above
let ind = indent(lnum)
let line = getline(lnum)
if line =~ '^\s*\(if\|then\|do\|else\|elif\|case\|while\|until\|for\)\>'
\ || line =~ '^\s*\<\k\+\>\s*()\s*{'
\ || line =~ '^\s*{'
if line !~ '\(esac\|fi\|done\)\>\s*$' && line !~ '}\s*$'
let ind = ind + &sw
endif
endif
if line =~ '^.*<<.*\(EOF\|END\)'
let ind = 0
endif
if line =~ '^"\?\(EOF\|END\)"\?$'
let ind = indent(search('>.*EOF', 'b'))
endif
" Subtract a 'shiftwidth' on a then, do, else, esac, fi, done
" Retain the indentation level if line matches fin (for find)
let line = getline(v:lnum)
if (line =~ '^\s*\(then\|do\|else\|elif\|esac\|fi\|done\)\>' || line =~ '^\s*}')
\ && line !~ '^\s*fi[ln]\>'
let ind = ind - &sw
endif
return ind
endfunction
let &cpo = s:cpo_save
unlet s:cpo_save
不过delimiter只能是EOF或者END。