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"
" big_file_options.vim: When opening a large file, take some measures to keep
" things loading quickly.
"
" Author: Tom Ryder <tom@sanctum.geek.nz>
" License: Same as Vim itself
"
if exists('g:loaded_big_file_options') || &compatible
finish
endif
if !has('autocmd') || v:version < 600
finish
endif
let g:loaded_big_file_options = 1
" Declare function for turning off slow options
function! s:BigFileOptions()
" Don't do anything if the buffer size is under the threshold
let l:size = exists('g:big_file_size')
\ ? g:big_file_size
\ : 10 * 1024 * 1024
if line2byte(line('$') + 1) <= l:size
return
endif
" Turn off backups, swap files, and undo files
setlocal nobackup
setlocal nowritebackup
setlocal noswapfile
if has('persistent_undo')
setlocal noundofile
endif
" Limit the number of columns of syntax highlighting
let l:synmaxcol = exists('g:big_file_synmaxcol')
\ ? g:big_file_synmaxcol
\ : 256
if exists('+synmaxcol') && &l:synmaxcol > l:synmaxcol
let &l:synmaxcol = l:synmaxcol
endif
" Disable syntax highlighting if configured to do so
let l:syntax = exists('g:big_file_syntax')
\ ? g:big_file_syntax
\ : 0
if !l:syntax
setlocal syntax=OFF
endif
endfunction
" Define autocmd for calling to check filesize
augroup big_file_options
autocmd!
autocmd BufReadPost * call s:BigFileOptions()
augroup end
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