How can I “linkify” a non-org-mode buffer in emacs [duplicate]

Answer 1

I think text properties are what you are seeking. The Elisp info file even includes an entry on "Clickable Text", Text -> Text Properties -> Clickable Text. That section actually includes a pretty detailed example on how to achieve just the sort of thing you mention.

Answer 2

I've just created an emacs minor mode that enables org style links in non-org-mode buffers. Still a work-in-progress but you can find it here: https://github.com/seanohalpin/org-link-minor-mode

BTW, this question is a duplicate of How to make org syntax links in any emacs buffer look like in org-mode?