fish_clipboard_copy/paste: Handle redirected stdout/stdin

[faho]

Description

This makes these tools usable in a pipe.

You can run

some-long-command | fish_clipboard_copy

to copy some command's output to your clipboard, and

fish_clipboard_paste | some-other-command

To feed your clipboard to some command.

For instance, let's say I want to insert my patented "commits missing from release X" table.

I've written a function called "gitcomp" to generate the info, and I have another function "mdtable" that transforms it to markdown. But I need it in my clipboard so I can paste it in the browser, and previously I'd use xsel --clipboard for that, which is very platform-dependent - if I switched to wayland I'd suddenly have to get used to a different thing!

So now I can instead do:

LANG=en_US.UTF-8 gitcomp | tail -n 5 | mdtable -d\t release commits percent date | fish_clipboard_copy

and paste directly into my browser to get:

release	commits	percent	date
3.4.0	1106	5.7%	2022-03-12 22:31:57 +0800 (7 months ago)
3.4.1	9	5.7%	2022-03-26 00:27:56 +0800 (7 months ago)
3.5.0	433	3%	2022-06-16 21:02:33 +1000 (4 months ago)
3.5.1	24	2.9%	2022-07-20 18:15:47 +0800 (3 months ago)
HEAD	469	0%

and if I want to work on something from my clipboard, I can do

fish_clipboard_paste | something

and be reasonably sure it'll work.

TODOs:

• Changes to fish usage are reflected in user documentation/manpages.
• [N/A] Tests have been added for regressions fixed
• User-visible changes noted in CHANGELOG.rst

[mqudsi]

+1 for me; I forgot this wasn't already supported. It's one of the many clipboard-related things I can't live without as part of my fish config.

I also have support for copying the contents of a file or pasting the clipboard to a file when invoked as fish_clipboard_copy source.txt or fish_clipboard_paste dest.txt. This is, of course, just a shortcut for fish_clipboard_copy < source.txt and fish_clipboard_paste > dest.txt but I found it worth adding support for given how often I do it to copy contents between machines (together w/ the copy/paste-over-ssh support) or to a web browser (often for github issues).

[ilyagr]

Thank you so much! I just discovered this gem.