Use b:undo variables correctly

Setting or adding to b:undo_indent and b:undo_ftplugin variables, which
I only learned about just now, allows me to avoid the _GLOBAL.vim hack
and remove some files from both vim/indent/ and vim/ftplugin/.

These variables aren't subjected to :execute automatically in anything
older than Vim 7.0, but I don't think that's too much of a concern as
the only real reason they're needed are for changing filetypes in the
same buffer, which doesn't happen that often anyway.

1 files changed, 11 insertions, 0 deletions

diff --git a/vim/ftplugin/text.vim b/vim/ftplugin/text.vim
new file mode 100644
index 00000000..15333202
--- /dev/null
+++ b/vim/ftplugin/text.vim
@@ -0,0 +1,11 @@
+" Spellcheck documents by default
+if has('syntax')
+  setlocal spell
+
+  " Undo
+  if !exists('b:undo_ftplugin')
+    let b:undo_ftplugin = ''
+  endif
+  let b:undo_ftplugin = b:undo_ftplugin
+        \ . '|setlocal spell<'
+endif