65 lines
2.4 KiB
Bash
Executable File
65 lines
2.4 KiB
Bash
Executable File
#!/bin/sh
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#
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# Usage: yank [FILE...]
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#
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# Copies the contents of the given files (or stdin if no files are given) to
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# the terminal that runs this program. If this program is run inside tmux(1),
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# then it also copies the given contents into tmux's current clipboard buffer.
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# If this program is run inside X11, then it also copies to the X11 clipboard.
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#
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# This is achieved by writing an OSC 52 escape sequence to the said terminal.
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# The maximum length of an OSC 52 escape sequence is 100_000 bytes, of which
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# 7 bytes are occupied by a "\033]52;c;" header, 1 byte by a "\a" footer, and
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# 99_992 bytes by the base64-encoded result of 74_994 bytes of copyable text.
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#
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# In other words, this program can only copy up to 74_994 bytes of its input.
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# However, in such cases, this program tries to bypass the input length limit
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# by copying directly to the X11 clipboard if a $DISPLAY server is available;
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# otherwise, it emits a warning (on stderr) about the number of bytes dropped.
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#
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# See http://en.wikipedia.org/wiki/Base64 for the 4*ceil(n/3) length formula.
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# See http://sourceforge.net/p/tmux/mailman/message/32221257 for copy limits.
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# See http://sourceforge.net/p/tmux/tmux-code/ci/a0295b4c2f6 for DCS in tmux.
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#
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# Written in 2014 by Suraj N. Kurapati and documented at http://goo.gl/NwYqfW
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buf=$( cat "$@" )
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# Create the OSC52 escape string.
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len=$( printf %s "$buf" | wc -c ) max=74994
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test $len -gt $max && echo "$0: input is $(( len - max )) bytes too long" >&2
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esc="\033]52;c;$( printf %s "$buf" | head -c $max | base64 | tr -d '\r\n' )\a"
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test -n "$TMUX" && esc="\033Ptmux;\033$esc\033\\"
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# Output the string to waiting terminals
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printf "$esc"
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# Attempt to push to the raw SSH_TTY if that exists.
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test -n "$SSH_TTY" && printf "$esc" > $SSH_TTY
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if [ -n "$TMUX" ]; then
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#push the OSC52 esc string to the clients directly.
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# tmux_clients=$(tmux list-clients -F "#{client_tty}")
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# readarray -t tmux_clients <<<"$tmux_clients"
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# for c in ${tmux_clients[@]}; do
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# printf "$esc" > $c
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# done
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#
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# And add it directly to the TMUX copy buffer.
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test -n "$TMUX" && tmux set-buffer "$buf"
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fi
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# copy to X11 if possible...
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test -n "$DISPLAY" && command -v xsel > /dev/null && command -v xclip > /dev/null \
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&& printf %s "$buf" | { xsel -ib || xclip -sel c ;} && exit
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# copy to pbcopy on MacOS
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command -v pbcopy > /dev/null && printf %s "$buf" | pbcopy
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# Copy to remote pbcopy daemon, if attached
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if $(nc -z localhost 5556); then
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printf %s "$buf" | nc localhost 5556
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fi
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