Add bifocal recipe

[riscy]

Brief summary of what the package does

In bifocal-mode, paging up causes a comint-mode buffer to be split in two windows with a larger window on top (the head) and a smaller input window preserved on the bottom (the tail). This helps with monitoring new output and entering text at the prompt (in the tail window), while reviewing previous output (in the head window). Paging down all the way causes the split to disappear.

Direct link to the package repository

https://github.com/riscy/bifocal-mode

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Please confirm with x:

• I've read CONTRIBUTING.md
• I've used package-lint to check for packaging issues, and addressed its feedback
• My elisp byte-compiles cleanly
• M-x checkdoc is happy with my docstrings
• I've built and installed the package using the instructions in CONTRIBUTING.md

[purcell]

Thanks. This is interesting.

BTW, the turn-on function in define-globalized-minor-mode doesn't need to be interactive. I feel like you could just define a regular global minor mode that adds/removes bifocal-mode from comint-mode-hook, since the current code causes the check to happen in every buffer.

[riscy]

Awesome, thank you for the feedback!

[riscy]

Following up -- I think just adding the turn-on to comint-mode-hook means the mode won't get turned [on] in existing buffers when someone calls bifocal-global-mode []. Thanks again. 👍