Move Vim big file options config into plugin

Created targets install-vim-doc and install-vim-plugin with accompanying
subdirectories of "vim".

Added a very short summary of what the plugin does to bigfile.txt.

I intend to spin off at least a couple of the blocks of my Vim
configuration that are starting to coalesce into distinct plugins unto
themselves, and will place the files in these directories.

1 files changed, 28 insertions, 0 deletions

diff --git a/vim/plugin/bigfile.vim b/vim/plugin/bigfile.vim
new file mode 100644
index 00000000..5c68b1a7
--- /dev/null
+++ b/vim/plugin/bigfile.vim
@@ -0,0 +1,28 @@
+" When opening a large file, take some measures to keep things loading quickly
+if has('eval') && has('autocmd')
+
+  " Threshold is 10 MiB
+  let g:big_file_size = 10 * 1024 * 1024
+
+  " Declare function for turning off slow options
+  function! s:BigFileMeasures()
+    let l:file = expand('<afile>')
+    if getfsize(l:file) > g:big_file_size
+      setlocal nobackup
+      setlocal nowritebackup
+      setlocal noswapfile
+      if has('persistent_undo')
+        setlocal noundofile
+      endif
+      if exists('&synmaxcol')
+        setlocal synmaxcol=256
+      endif
+    endif
+  endfunction
+
+  " Define autocmd for calling to check filesize
+  augroup dotfiles_big_file_measures
+    autocmd!
+    autocmd BufReadPre * call s:BigFileMeasures()
+  augroup end
+endif