在VIM下使用gg=G格式化shell代碼時，如果代碼中有heredoc，經過格式化后會造成代碼運行失敗。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 ""
格式化后會成這樣：
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對heredoc的代碼進行了縮進（四個空格），這樣會導致執行出錯。
解決：修改vim格式化shell腳本的規則，格式化時忽略heredoc。
將如下腳本保存到.vim/indent/sh.vim:
（來源：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
不過delimiter只能是EOF或者END。