Convert Tabs to Spaces on file save

It's good practice to use spaces instead of tabs when indenting code. Sublime Text 2 allows you to convert tabs to spaces in existing files manually (View -> Indentation -> Convert indentation to spaces).

However, this can be done automatically when saving the file. Paste the code below into a new file called ExpandTabsOnSave.py and save it under $SUBLIME_HOME$\Packages\ExpandTabsOnSave\.

import sublime, sublime_plugin, os

class ExpandTabsOnSave(sublime_plugin.EventListener):
  # Run ST's 'expand_tabs' command when saving a file
  def on_pre_save(self, view):
    if view.settings().get('expand_tabs_on_save') == 1:
      view.window().run_command('expand_tabs')

You can enable the plugin for a given project by pasting the following into the Project's .sublime-project file:

"settings": {
    "expand_tabs_on_save": true
}

If instead you wish to enable it globally, use your Settings file (Preferences -> Settings - User):

"expand_tabs_on_save": true