From 69cac9e123d74fa9fecf96177cb79d8370a833f1 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Fri, 10 Nov 2017 21:13:21 +1300
Subject: Move backup, swap, and undo dir logic into plugins

---
 vim/plugin/auto_undodir.vim | 57 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 vim/plugin/auto_undodir.vim

(limited to 'vim/plugin/auto_undodir.vim')

diff --git a/vim/plugin/auto_undodir.vim b/vim/plugin/auto_undodir.vim
new file mode 100644
index 00000000..1d20ba95
--- /dev/null
+++ b/vim/plugin/auto_undodir.vim
@@ -0,0 +1,57 @@
+"
+" auto_undodir.vim: Configure 'undodir' automatically, including trying hard
+" to create it.
+"
+" Author: Tom Ryder <tom@sanctum.geek.nz>
+" License: Same as Vim itself
+"
+if exists('g:loaded_auto_undodir')
+      \ || !has('persistent_undo')
+      \ || &compatible
+  finish
+endif
+let g:loaded_auto_undodir = 1
+
+" Define the undo path we want
+if exists('$VIM_UNDODIR')
+  let s:undodir = $VIM_UNDODIR
+else
+
+  " This is imperfect in that it will break if you have a backslashed comma in
+  " the first component of your &runtimepath, but if you're doing that, you
+  " probably already have way bigger problems
+  let s:undodir 
+      \ = strpart(&runtimepath, 0, stridx(&runtimepath, ','))
+      \ . '/undo'
+endif
+
+" If the prospective undo directory does not exist, try hard to create it
+if !isdirectory(expand(s:undodir))
+
+  " Try Vim's native mkdir() first
+  if exists('*mkdir')
+    silent! call mkdir(expand(s:undodir), 'p', 0700)
+
+  " Failing that, use an OS-dependent command
+  " (Fortunately, Unix and Windows are the only OS types in the world)
+  elseif has('unix')
+    silent! execute '!mkdir -m 0700 -p ' 
+          \ . shellescape(expand(s:undodir))
+  elseif has('win32') || has('win64')
+    silent! execute '!mkdir ' 
+          \ . shellescape(expand(s:undodir))
+  endif
+
+endif
+
+" If the directory exists after that...
+if isdirectory(expand(s:undodir))
+
+  " Set the undo directory and turn persistent undo files on
+  execute 'set undodir^=' . s:undodir . '//'
+  set undofile
+
+" If not, give up and raise an error
+else
+  echoerr 'Could not create undodir ' . s:undodir
+endif
-- 
cgit v1.2.3