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Cache fugitive#Head() to minimize statusline IO

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Closes https://github.com/tpope/vim-fugitive/issues/1384
This commit is contained in:
Tim Pope
2019-11-15 20:05:18 -05:00
parent 8c84ea6fdb
commit b24f98fbb1
1 changed files with 15 additions and 2 deletions
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17
autoload/fugitive.vim
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@@ -489,12 +489,21 @@ function! s:EchoExec(...) abort
return 'checktime'
endfunction
let s:head_cache = {}
function! fugitive#Head(...) abort
let dir = a:0 > 1 ? a:2 : s:Dir()
if empty(dir) || !filereadable(fugitive#Find('.git/HEAD', dir))
if empty(dir)
return ''
endif
let head = readfile(fugitive#Find('.git/HEAD', dir))[0]
let file = fugitive#Find('.git/HEAD', dir)
let ftime = getftime(file)
if ftime == -1
return ''
elseif ftime != get(s:head_cache, dir, [-1])[0]
let s:head_cache[dir] = [ftime, readfile(file)[0]]
endif
let head = s:head_cache[dir][1]
if head =~# '^ref: '
return substitute(head, '\C^ref: \%(refs/\%(heads/\|remotes/\|tags/\)\=\)\=', '', '')
elseif head =~# '^\x\{40,\}$'
@@ -2396,12 +2405,16 @@ endif
function! s:ExpireStatus(bufnr) abort
if a:bufnr == -2
let s:head_cache = {}
let s:last_time = reltime()
return ''
endif
let dir = s:Dir(a:bufnr)
if len(dir)
let s:last_times[s:cpath(dir)] = reltime()
if has_key(s:head_cache, dir)
call remove(s:head_cache, dir)
endif
endif
return ''
endfunction