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"
" big_file.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 has('eval') && has('autocmd')
" Default threshold is 10 MiB
if !exists('g:big_file_size')
let g:big_file_size = 10 * 1024 * 1024
endif
" Default to leaving syntax highlighting off
if !exists('g:big_file_syntax')
let g:big_file_syntax = 0
endif
" Cut 'synmaxcol' down to this or smaller for big files
if !exists('g:big_file_synmaxcol')
let g:big_file_synmaxcol = 256
endif
" Declare function for turning off slow options
function! s:BigFileOptions(name, size)
" Don't do anything if the file is under the threshold
if getfsize(a:name) <= a: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
if exists('&synmaxcol') && &synmaxcol > g:big_file_synmaxcol
execute 'setlocal synmaxcol=' . g:big_file_synmaxcol
endif
" Disable syntax highlighting if configured to do so
if !g:big_file_syntax
setlocal syntax=OFF
endif
endfunction
" Define autocmd for calling to check filesize
augroup big_file_options_bufreadpre
autocmd!
autocmd BufReadPre * call s:BigFileOptions(expand('<afile>'), g:big_file_size)
augroup end
endif
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