On 15 Oct 2016, at 1:33, Greg wrote:

Comment for jbuilder should be a #, but TM is putting a double slash. The files are Rails apps/views/<view>/xxx.json.jbuilder .

[…]

Can I change this? If so how?

Comment characters are based on the TM_COMMENT_START etc. environment variables.

If you use Bundles → Select Bundle Item… (⌃⌘T) and switch to settings, then you can enter tm_comment and see the current values for these variables.

These would normally come from bundle settings items.

Change file type to Ruby. Probably was JavaScript automatically.

Did I change it to jS or is that something TM does.

On a clean install of TextMate, opening foo.json.jbuilder will treat it as plain text.

If you change the language (via the status bar) then TextMate will remember this binding, and the default comment characters will follow.

Normally it should only be necessary to set TM_COMMENT_START etc. if you want to override the default for the language, so simply setting the proper language (ruby) for jbuilder files should be enough.

Alternatively, you could put something like this in ~/.tm_properties:

[ *.json.jbuilder ]
TM_COMMENT_START = '# '

But the best is to just bind jbuilder files to the proper language and rely on the defaults.