Quicklook any plain-text file e.g. HAML or ERB
I’m often jumping from file to file in Rails, so I really wanted Quicklook support for my template files. Unfortunately, the suggestions I found online were confusing and incomplete.
Here’s a really easy way to get it done – but no syntax highlighting 
1. Show the contents of TextEdit’s package
2. Open Info.plist in a text editor… like TextEdit, perhaps… hmm…
3. Anyway, add the following snippet (find the code on github):
Put it just before the following section:
4. Customize
- UTTypeDescription - put in description of your choice (although you probably don’t need to)
- UTTypeIdentifier – apparently (and this is what was missing from other descriptions), you just make something up here
- public.filename-extension – add as many extensions as you want to map to this file type
5. Gloat
