Create tab-expand plugin for vim

This moves from a one-size-fits-all approach for tab expansion to
dictating a default expansion scheme and a per filetype scheme. The
current plugin has custom schemes for Ruby and Makefiles.

vim/plugin/tab-expand.vim

@@ -0,0 +1,36 @@
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+" Tabs plugin for vim
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+"
+" This plugin reconfigures the tab key expansion depending on the language
+" of the file being edited.
+"
+" USAGE:
+" -- vim 6:     Stick this file in your ~/.vim/plugin directory (or in a
+"               'plugin' directory in some other directory that is in your
+"               'runtimepath'.
+"
+" -- vim 5:     Stick this file somewhere and 'source cscope.vim' it from
+"               your ~/.vimrc file (or cut and paste it into your .vimrc).
+"
+" NOTE:
+" Make sure to add individual preferences for the language of your choice.
+"
+" Nirenjan Krishnan     nirenjan@gmail.com              2013/04/12
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+" Default
+" Tabstop = 4
+" Soft Tabstop = 4
+" Shiftwidth = 4
+" Expand tabs
+autocmd FileType * set ts=4 sts=4 sw=4 et
+
+" Ruby
+" Tabstop = 2, expand
+autocmd FileType ruby setlocal ts=2 sts=2 sw=2 et
+
+" Make
+" Tabstop = 4, No expand tab
+autocmd FileType make setlocal ts=4 sts=4 sw=4 noet
+

vimrc

@@ -6,10 +6,7 @@ call pathogen#infect()
 call pathogen#helptags()
 
 " Editing options
-" No tabs, shiftwidth 4, tabstop 4
+" These are now handled by the tab-expand plugin
-set shiftwidth=4
-set tabstop=4
-set expandtab
 
 " Automatic indentation of code blocks
 set autoindent