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"
" auto_undodir.vim: Configure 'undodir' automatically, including trying hard
" to create it.
"
" Author: Tom Ryder <tom@sanctum.geek.nz>
" License: Same as Vim itself
"
if exists('g:loaded_auto_undodir') || &compatible || !has('persistent_undo')
finish
endif
let g:loaded_auto_undodir = 1
" Define the undo path we want
if exists('$VIM_UNDODIR')
let s:undodir = $VIM_UNDODIR
else
" This is imperfect in that it will break if you have a backslashed comma in
" the first component of your &runtimepath, but if you're doing that, you
" probably already have way bigger problems
let s:undodir
\ = strpart(&runtimepath, 0, stridx(&runtimepath, ','))
\ . '/undo'
endif
" If the prospective undo directory does not exist, try hard to create it
if !isdirectory(expand(s:undodir))
" Try Vim's native mkdir() first
if exists('*mkdir')
silent! call mkdir(expand(s:undodir), 'p', 0700)
" Failing that, use an OS-dependent command
" (Fortunately, Unix and Windows are the only OS types in the world)
elseif has('unix')
silent! execute '!mkdir -m 0700 -p '
\ . shellescape(expand(s:undodir))
elseif has('win32') || has('win64')
silent! execute '!mkdir '
\ . shellescape(expand(s:undodir))
endif
endif
" If the directory exists after that...
if isdirectory(expand(s:undodir))
" Set the undo directory and turn persistent undo files on
execute 'set undodir^=' . s:undodir . '//'
set undofile
" If not, give up and raise an error
else
echoerr 'Could not create undodir ' . s:undodir
endif
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