The solutions I've found piggy backed on the scope selectors in TextMate. This has the side effect of the guides not being visible on lines with no whitespace.

Here's a stack overflow question in which I describe how to get this working http://stackoverflow.com/questions/17463270/column-indentation-guide-on-textmate/17492004#17492004

I was even maintainting a fork https://github.com/loadedsith/textmate that had a rudimentary fold guide support, it worked the same as the above just a little prettier. It worked by adding a new font state, as in bold and italic, and drawing a vertical line at the beginning of the fold-guide scope selector. Unfortunately they broke in a recent build and I've not fixed it (yet). Should anyone wish to carry the torch, the commit that actually made it work (while it worked) was https://github.com/loadedsith/textmate/commit/2a7239047217d35696494040c131e995ae5ac7d6

I asked Allen once if he'd pull it in to the main branch, he felt it would need to be a setting, unfortunately its not something I've been able to do.

--
graham.p.heath@gmail.com

I agree that it would be a useful addition to Textmate. To some extent,
having fold guide lines would also alleviate the issue I ponted out in a
previous email
(http://textmate.1073791.n5.nabble.com/Show-current-scope-block-but-not-Textmate-scope-td27940.html).

Cheers,
Guido

--
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