#4820 Feature: Built-in copy action for cross-platform clipboard support

Checklist

I have read through the manual page (man fzf)
I have searched through the existing issues
For bug reports, I have checked if the bug is reproducible in the latest version of fzf

Output of `fzf --version`

0.73.1 (ae78a5c5)

OS

Linux
macOS
Windows
Etc.

Shell

bash
zsh
fish

Problem / Steps to reproduce

Issue: often used snippet, but macOS only; will fail when using same setup on a non-mac

fzf --bind 'enter:execute:echo -n {1} | pbcopy'

Solution: OS-independent way to copy a string to clipboard

fzf --bind 'enter:copy-string:{1}'

a paste action seems redundant, user already has ⌃ ControlV / ⌘ CommandV

one possible use case was accessing the clipboard value, e.g. through a placeholder (not important)

# popup that disappears after 2s; modified example from CHANGELOG.md 0.63.0
echo "https://example.com" | fzf \
  --bind "ctrl-y:copy-string:{}" \
  --bind "ctrl-y:+change-footer:{input_paste}" \
  --bind "ctrl-y:+bg-cancel+bg-transform-footer:sleep 2"

tools with clipboard feature

`broot` (rust)

added ~2020 https://github.com/Canop/broot/commit/f73071b3ecf8
current crate used: https://github.com/Canop/terminal-clipboard

name	key	description
copy_line	alt-c	copy selected line (in tree or preview)
copy_path		copy path to system clipboard
input_paste	ctrl-v	paste the clipboard content into the input

# needs to be built with feature flag (brew formula does not set it)
cargo install broot --features clipboard
# run
~/.cargo/bin/broot
# press 'alt-c' on selected item
# press 'ctrl-v' to paste

`television` (rust)

handles it without a dedicated crate

https://github.com/alexpasmantier/television/blob/main/television/utils/clipboard.rs

name	key
copy_entry_to_clipboard	ctrl-y

additional notes

some terminals support OSC 52 (ghostty, VSCode 1.91+, ...)

printf "\033]52;c;%s\007" "$(printf "FooBar" | base64)"

related issues

#4421
#2323
#2033

Feature: Built-in copy action for cross-platform clipboard support