Customize Quick Look to allow me to view .yml files

Solution 1:

I use Ciarán Walsh’s TextMate in QuickLook plugin.

This is a TextMate plug-in and a QuickLook generator which renders QuickLook previews (for certain filetypes) using the TextMate syntax highlighter. Currently it’s configured to highlight Perl, PHP, Ruby, Shell, C headers and Obj-C(++). Note: this effectively sets up TextMate as a server for the syntax highlighting, so it won’t work unless TM is running (QuickLook will just fall back to the standard preview if it’s not).

Here is a convenience link to download the plugin and you can read more about it on Ciarán's web page.

This is what it looks like when I QuickLook a .yml file:

Solution 2:

I've had great luck with the free QLStephen plugin for Quick Look. It displays lots of other plaintext formats.
Probably worth a shot to see if it will work with YAML files.

You can get it here.

Solution 3:

You can use the QLStephen plugin as mentioned but you will need to edit it as described in the project's issue tracker: https://github.com/whomwah/qlstephen/issues/23#issuecomment-21769063

Basically:

1. Open the ~/Library/QuickLook/QLStephen.qlgenerator/Contents/Info.plist file in a text editor
2. Add the UTI public.yaml to the key LSItemContentTypes
3. Run qlmanage -r to reload the service