From d3cb264cbbdc63d41b9d57208e9419416ba0b489 Mon Sep 17 00:00:00 2001
From: Michael Campagnaro <mikecampo@gmail.com>
Date: Fri, 4 Nov 2016 15:19:59 -0400
Subject: [PATCH] Fix persisted undo history in vimrc

---
 vimrc | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/vimrc b/vimrc
index 4cddb14..2d1fe7e 100644
--- a/vimrc
+++ b/vimrc
@@ -121,9 +121,23 @@ set list listchars=tab:»·,trail:·
 set timeoutlen=300 ttimeoutlen=0
 
 " Allow undo when doing back into a closed file
-set undodir=$HOME/.vim/undo
 set undolevels=1000
 set undoreload=10000
+" Keep undo history across sessions by storing it in a file
+if has('persistent_undo')
+    let undo_dir = expand(s:vim_dir . '/undo')
+    " Create dirs
+    if IsWindows()
+      let mkdir = 'mkdir '
+    else
+      let mkdir = 'mkdir -p '
+    endif
+    :silent call system(mkdir . s:vim_dir)
+    :silent call system(mkdir . undo_dir)
+    let &undodir = undo_dir
+    " Persist undo
+    set undofile
+endif
 
 " When loading text files, wrap them and don't split up words.
 au BufNewFile,BufRead *.txt setlocal wrap