Add short-circuit boilerplate to plugins

Set a g:loaded_* flag to prevent repeated reloads, and refuse to load at
all if &compatible is set or if required features are missing.

Some more accommodating plugins avoid the problems 'compatible' causes
by saving its value at startup into a script variable, setting the
option to the Vim default, and then restoring it when the plugin is
done, to prevent any of its flags from interfering in the plugin code:

    let s:save_cpo = &cpo
    set cpo&vim
    ...
    let &cpo = s:save_cpo
    unlet s:save_cpo

I don't want this boilerplate, so I'm going to do what Tim Pope's
modules seem to, and just have the plugin refuse to do a single thing if
'compatible' is set.

1 files changed, 50 insertions, 47 deletions

diff --git a/vim/plugin/big_file_options.vim b/vim/plugin/big_file_options.vim
index fd686fd8..3d239048 100644
--- a/vim/plugin/big_file_options.vim
+++ b/vim/plugin/big_file_options.vim
@@ -5,58 +5,61 @@
 " Author: Tom Ryder <tom@sanctum.geek.nz>
 " License: Same as Vim itself
 "
-if has('eval') && has('autocmd')
+if exists('g:loaded_big_file_options')
+      \ || !has('autocmd')
+      \ || &compatible
+  finish
+endif
+let g:loaded_big_file_options = 1
+
+" Default threshold is 10 MiB
+if !exists('g:big_file_size')
+  let g:big_file_size = 10 * 1024 * 1024
+endif
 
-  " Default threshold is 10 MiB
-  if !exists('g:big_file_size')
-    let g:big_file_size = 10 * 1024 * 1024
+" 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()
+
+  " Don't do anything if the file is under the threshold
+  if getfsize(expand('<afile>')) <= g:big_file_size
+    return
   endif
 
-  " Default to leaving syntax highlighting off
-  if !exists('g:big_file_syntax')
-    let g:big_file_syntax = 0
+  " Turn off backups, swap files, and undo files
+  setlocal nobackup
+  setlocal nowritebackup
+  setlocal noswapfile
+  if has('persistent_undo')
+    setlocal noundofile
   endif
 
-  " Cut 'synmaxcol' down to this or smaller for big files
-  if !exists('g:big_file_synmaxcol')
-    let g:big_file_synmaxcol = 256
+  " Limit the number of columns of syntax highlighting
+  if exists('&synmaxcol')
+        \ && &synmaxcol > g:big_file_synmaxcol
+    execute 'setlocal synmaxcol=' . g:big_file_synmaxcol
   endif
 
-  " Declare function for turning off slow options
-  function! s:BigFileOptions()
-
-    " Don't do anything if the file is under the threshold
-    if getfsize(expand('<afile>')) <= g:big_file_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()
-  augroup end
+  " Disable syntax highlighting if configured to do so
+  if !g:big_file_syntax
+    setlocal syntax=OFF
+  endif
 
-endif
+endfunction
+
+" Define autocmd for calling to check filesize
+augroup big_file_options_bufreadpre
+  autocmd!
+  autocmd BufReadPre
+        \ *
+        \ call s:BigFileOptions()
+augroup end