Move functions into autoload

This means we require Vim 7.0.

1 files changed, 112 insertions, 0 deletions

diff --git a/autoload/big_file_options.vim b/autoload/big_file_options.vim
new file mode 100644
index 0000000..5c57343
--- /dev/null
+++ b/autoload/big_file_options.vim
@@ -0,0 +1,112 @@
+" Wrapper function to get the configured size limit, default to 10 MiB
+function! s:Limit()
+  let limit = exists('g:big_file_options_limit')
+        \ ? g:big_file_options_limit
+        \ : 10 * 1024 * 1024
+  return limit
+endfunction
+
+" If we can use filesize to detect the big file early, we should
+function! big_file_options#CheckPre(filename)
+
+  " Try and get filesize, bail out if we can't
+  let size = getfsize(a:filename)
+  if size == -1
+    return
+  endif
+
+  " Set the buffer's big flag to whether the file is verifiably outsize
+  let b:big_file_options_big = size == -2 || size > s:Limit()
+
+  " If we found it's a big file, call the early options set
+  if b:big_file_options_big
+    call s:SetPre()
+  endif
+
+endfunction
+
+" If it's still indeterminate (stdin read?), try to check the buffer size
+" itself
+function! big_file_options#CheckPost()
+
+  " The BufReadPre hook couldn't tell how big the file was; we'll examine it
+  " now it's loaded into the buffer instead
+  if !exists('b:big_file_options_big')
+
+    " Test buffer size, bail if that doesn't work either
+    let size = line2byte(line('$') + 1)
+    if size == -1
+      return
+    endif
+
+    " Flag the buffer's oversize status, if it's positive, we'll catch up and
+    " run the early options set now
+    let b:big_file_options_big = size > s:Limit()
+    if b:big_file_options_big
+      call s:SetPre()
+    endif
+
+  endif
+
+  " If the buffer size is verifiably over the threshold, run the late options
+  " set
+  if b:big_file_options_big
+    call s:SetPost()
+  endif
+
+endfunction
+
+" These options can and should be set as early as possible
+function! s:SetPre()
+
+  " These are always set
+  setlocal noswapfile
+  setlocal undolevels=-1
+  if has('persistent_undo')
+    setlocal noundofile
+  endif
+
+  " Decide whether to set readonly options
+  let readonly = exists('g:big_file_options_readonly')
+        \ ? g:big_file_options_readonly
+        \ : 1
+  if readonly
+    setlocal buftype=nowrite
+    setlocal nomodifiable
+    setlocal readonly
+  endif
+endfunction
+
+" These options need to be set later, after the buffer has loaded
+function! s:SetPost()
+
+  " Force filetype off
+  setlocal filetype=NONE
+
+  " Syntax features
+  if has('syntax')
+
+    " Disable syntax highlighting if configured
+    let syntax = exists('g:big_file_options_syntax')
+          \ ? g:big_file_options_syntax
+          \ : 0
+    if !syntax
+      setlocal syntax=OFF
+    endif
+
+    " Force maximum syntax columns down if configured
+    if exists('+synmaxcol')
+      let synmaxcol = exists('g:big_file_options_synmaxcol')
+            \ ? g:big_file_options_synmaxcol
+            \ : 256
+      if exists('+synmaxcol') && &synmaxcol > synmaxcol
+        let &l:synmaxcol = synmaxcol
+      endif
+    endif
+
+  endif
+
+  " Tell the user what we've done
+  echomsg 'Big file detected, set appropriate options'
+
+endfunction