当我遇到问题时，我试图在Vim 7.3中自定义状态行。
我正在尝试将SVN信息放在状态行中，所以我做了类似这样的事情：
function! DrawStatusLine()
let svn = system("svn info")
let l:status = " "
let l:status = l:status . svn
let l:status = l:status . "%t" "tail of the filename
let l:status = l:status . "%*"
let l:status = l:status . "[%{strlen(&fenc)?&fenc:'none'}," "file encoding
let l:status = l:status . "%{&ff}]" "file format
let l:status = l:status . "%h" "help file flag
let l:status = l:status . "%m" "modified flag
let l:status = l:status . "%r" "read only flag
let l:status = l:status . "%=" "left/right separator
let l:status = l:status . "%c," "cursor column
let l:status = l:status . "%l/%L" "cursor line/total lines
let l:status = l:status . "\ %P" "percent through file
return l:status
endfunction
set statusline=%!DrawStatusLine()
但是在调用sytem（）之后，光标移动得非常慢。每次移动光标时似乎都会调用system（实际上，每当窗口中发生某些事情时，似乎都会调用它）。
你知道我为什么会这样做吗？
这是.vimrc的其余部分，我没有使用异国情调的插件，而且我在Cygwin（Windows XP）下。
" When started as "evim", evim.vim will already have done these settings.
if v:progname =~? "evim"
finish
endif
" Use Vim settings, rather than Vi settings (much better!).
" This must be first, because it changes other options as a side effect.
set nocompatible
" Management of console or GUI settings.
if has("gui_running")
" We are in gVim
" Linux
if has("gui_gtk2")
:set guifont=DejaVu\ Sans\ Mono\ 11
" Windows
elseif has("gui_win32")
:set guifont=DejaVu_Sans_Mono:h11:cANSI:
endif
else
" We are in a console
set background=dark
endif
" Manage colors.
if filereadable($VIMRUNTIME . "/colors/wombat256.vim") ||
\ filereadable($VIM . "/vimfiles/colors/wombat256.vim") ||
\ filereadable($HOME . "/.vim/colors/wombat256.vim")
colorscheme wombat256
elseif filereadable($VIMRUNTIME . "/colors/wombat.vim") ||
\ filereadable($VIM . "/vimfiles/colors/wombat.vim") ||
\ filereadable($HOME . "/.vim/colors/wombat.vim")
colorscheme wombat
else
colorscheme desert
endif
" allow backspacing over everything in insert mode
set backspace=indent,eol,start
set history=50 " keep 50 lines of command line history
set ruler " show the cursor position all the time
set showcmd " display incomplete commands
set incsearch " do incremental searching
" For Win32 GUI: remove 't' flag from 'guioptions': no tearoff menu entries
let &guioptions = substitute(&guioptions, "t", "", "g")
" In many terminal emulators the mouse works just fine, thus enable it.
if has('mouse')
set mouse=a
endif
" Switch syntax highlighting on, when the terminal has colors
" Also switch on highlighting the last used search pattern.
if &t_Co > 2 || has("gui_running")
syntax on
set hlsearch
endif
" Only do this part when compiled with support for autocommands.
if has("autocmd")
" Enable file type detection.
" Use the default filetype settings, so that mail gets 'tw' set to 72,
" 'cindent' is on in C files, etc.
" Also load indent files, to automatically do language-dependent indenting.
filetype plugin indent on
" Put these in an autocmd group, so that we can delete them easily.
augroup vimrcEx
autocmd!
" For all text files set 'textwidth' to 78 characters.
autocmd FileType text setlocal textwidth=78
" When editing a file, always jump to the last known cursor position.
" Don't do it when the position is invalid or when inside an event handler
" (happens when dropping a file on gvim).
" Also don't do it when the mark is in the first line, that is the default
" position when opening a file.
autocmd BufReadPost *
\ if line("'\"") > 1 && line("'\"") <= line("$") |
\ exe "normal! g`\"" |
\ endif
augroup END
else
set autoindent " always set autoindenting on
endif " has("autocmd")
" Convenient command to see the difference between the current buffer and the
" file it was loaded from, thus the changes you made.
" Only define it when not defined already.
if !exists(":DiffOrig")
command DiffOrig vert new | set bt=nofile | r # | 0d_ | diffthis
\ | wincmd p | diffthis
endif
" Update the path with the dir where we opened Vim
set path=.,$PWD/**
" Now that we set the path to be recursive, disable
" the option that looking for completion in included files.
" Indeed, it can slow the process hard. We use tags instead.
set complete-=i
" Allow editing everywhere
set virtualedit=all
" No bells
set errorbells
set novisualbell
set vb t_vb=
" Show status bar
set laststatus=2
let loaded_matchparen = 1
" Draw the status line.
" Status line that rocks.
function! DrawStatusLine()
let svn = system("svn info")
let l:status = " "
let l:status = l:status . "%t" "tail of the filename
let l:status = l:status . "%*"
let l:status = l:status . "[%{strlen(&fenc)?&fenc:'none'}," "file encoding
let l:status = l:status . "%{&ff}]" "file format
let l:status = l:status . "%h" "help file flag
let l:status = l:status . "%m" "modified flag
let l:status = l:status . "%r" "read only flag
let l:status = l:status . "%=" "left/right separator
let l:status = l:status . "%c," "cursor column
let l:status = l:status . "%l/%L" "cursor line/total lines
let l:status = l:status . "\ %P" "percent through file
return l:status
endfunction
set statusline=%!DrawStatusLine()
" Highlight current line
set cursorline
" Add visible lines when start or end of the screen (3 lines)
set scrolloff=3
" Backup
set nobackup
" No preview in ins-completion.
set completeopt=menu
" Commands completion on status line.
set wildmenu
" Don't redraw while executing macros
set lazyredraw
" K = :help
set keywordprg=
" Diff always vertical
set diffopt+=vertical
" Use utf-8
set encoding=utf-8
set fileencoding=utf-8
" Remember buffer changes when jumping around.
set hidden
"""""""""""""""""
" Developpement "
"""""""""""""""""
" Line numbers
set nu
" Tabulation of 4 spaces
set expandtab
set smarttab
set shiftwidth=4
set softtabstop=4
set tabstop=4
" Show when a line exceeds 80 chars
highlight Overlength ctermbg=red ctermfg=white guibg=#592929
" Highlight Tabs and Spaces
" highlight Tab ctermbg=darkgray guibg=darkgray
" au BufWinEnter * let w:m2=matchadd('Tab', '/[^\t]\zs\t\+/', -1)
highlight Space ctermbg=darkblue guibg=darkblue
augroup matches
autocmd!
autocmd BufWinEnter * match Overlength /\%81v.*/
autocmd BufWinEnter * let w:m3=matchadd('Space', '\s\+$\| \+\ze\t', -1)
" Matches are memory greedy, shut them when the window is left
" Mybe it is redondant.
autocmd BufWinLeave * call clearmatches()
augroup END
set list listchars=tab:\ \ ,trail:.
" Redraw status line when saving.
" autocmd BufWritePost * set statusline=%!DrawStatusLine()
" Special indentation for switch / case
" Indentation when in unclosed (.
set cino=l1,(0
" Load Doxygen syntax
let g:load_doxygen_syntax=1
"""""""""""""""""
" Taglist
"""""""""""""""""
let Tlist_Use_Right_Window=1
"""""""""""""""""
" cscope
"""""""""""""""""
if has("cscope") && executable("cscope") && !has("gui_win32")
set csto=0
set cst
set nocsverb
" add any database in current directory
if filereadable("cscope.out")
cs add cscope.out
endif
" abbreviations
cnoreabbrev csf cs find
set csverb
endif
"""""""""""""
" Mapping "
"""""""""""""
" Don't use Ex mode, use Q for formatting
map Q gq
" CTRL-U in insert mode deletes a lot. Use CTRL-G u to first break undo,
" so that you can undo CTRL-U after inserting a line break.
inoremap <C-U> <C-G>u<C-U>
" With a map leader it's possible to do extra key combinations
" like <leader>w saves the current file
let mapleader = ","
let g:mapleader = ","
" After repeating command, return where we were.
map . .`[
" Switch tab.
noremap <A-h> gT
noremap <A-l> gt
" For dummy terminals
noremap <Esc>h gT
noremap <Esc>l gt
" Remap the Esc command
inoremap kj <Esc>
inoremap lk <Esc>
" Better for wrapped lines
nnoremap j gj
nnoremap k gk
" omnicompletion : words
inoremap <leader>, <C-x><C-o>
" Turn off highlighting in search.
nmap <leader>/ :nohlsearch<CR>
" edit .vimrc
nmap <silent> <leader>ev :tabnew $HOME/.vimrc<CR>
" source .vimrc
nmap <silent> <leader>sv :so $HOME/.vimrc<CR>
nnoremap <silent><leader>dh :call SVNDiff()<CR>
" Build C symbols.
function! BuildSymbols()
if has("cscope") && executable("cscope") && !has("gui_win32")
" kill all connection.
execute "cs kill -1"
execute "!ctags -R && cscope -Rb"
execute "cs add cscope.out"
else
execute "!ctags -R"
endif
endfunction
" Run Vim diff on HEAD copy in SVN.
function! SVNDiff()
let fn = expand("%:p")
let newfn = fn . ".HEAD"
let catstat = system("svn cat " . fn . " > " . newfn)
if catstat == 0
execute 'diffsplit ' . newfn
execute 'set filetype=c'
else
echo "*** ERROR: svn cat failed for ". fn . " (as " . newfn . ")"
endif
endfunction
" Build symbols with F2.
nnoremap <F2> :call BuildSymbols()<CR>
" Taglist with F3
nnoremap <F3> :TlistToggle<CR>
" Open a explorer on a vertical split of 26.
nnoremap <F4> :26Vexplore<CR>
" When you forgot to open the file as sudo.
cmap w!! %!sudo tee > /dev/null %
答案 0 :(得分：5)
'statusline'值一直在评估，它还能如何显示光标位置等信息？！不要在那里做耗时的事情;甚至很长的Vimscript片段都会大大减慢Vim的速度，system()是你可以做的最差的。
相反，在状态行中包含一个（缓冲区 - 本地）变量（例如%{exists('b:svn_info')?b:svn_info:''}），并使用适当的autocmds来设置和更新它：
:autocmd BufRead * let b:svn_info = system('svn info')
答案 1 :(得分：2)
现有答案的一个补充：有些插件已经自己保存缓存（如aurum）或者只在BufEnter上执行一次（如VCSCommand）。上述两个都能够替换您的SVNDiff功能。
VCSCommand将提供文件状态（仅限未知和新的）或（如果状态不是）修订，存储库以及存储库中新版本的存在。我必须在此重复一遍，在切换到另一个缓冲区然后再返回之前，它不会更新状态。
Aurum更灵活*，但除非你愿意每N秒经历输入滞后或切换到mercurial，否则你被迫使用文件状态和分支**（最后一个是当前的修订版信息）。 Subversion状态始终映射到八个mercurial状态之一。除非您使用+ python编译vim，否则它使用缓存方法（并且缓存失效将使您遭受延迟），但是+ python的事情是不同的：状态是在每个N秒的单独进程中获得的，并且不会因任何延迟而烦扰您除非你做了一些导致缓存失效的事情（目前使用+ python，你只会在失效发生时受到延迟，并且不会注意到它认为它是你的行为的一部分导致失效，但没有滞后被视为发生当状态行无效时。）
*从文档中我猜VCSCommand的作者打算让用户自己编写更好的状态行，但我没有看到任何可以帮助他们的东西。也许我只是在寻找错误的位置。
**此处的分支表示“存储库根URL中不存在的根目录URL的尾随部分”。根目录是嵌套最少的目录，其.svn子目录和存储库根URL等于当前目录（包含当前缓冲区的目录）。
即使您不愿意使用aurum，也可以随意借用重复执行的命令或缓存实现。
答案 2 :(得分：1)
这是预期的行为：每次移动光标时都会更新整个状态行，从而每次执行某些操作时都会执行svn info。可能每秒很多次。
这显然是浪费，因为当前文件的svn状态不会每秒改变10次。
您应该缓存此信息，并且只能在写入时或每{{}}}分钟或其他任何位置检索该信息。