OSC52 clipboard yanks

scripts/scripts/yank

@@ -0,0 +1,49 @@
+#!/bin/sh
+#
+# Usage: yank [FILE...]
+#
+# Copies the contents of the given files (or stdin, if no files are given) to
+# the terminal that runs this program.  If this program is run inside tmux(1),
+# then it also copies the given contents into tmux's current clipboard buffer.
+# If this program is run inside X11, then it also copies to the X11 clipboard.
+#
+# This is achieved by writing an OSC 52 escape sequence to the said terminal.
+# The maximum length of an OSC 52 escape sequence is 100_000 bytes, of which
+# 7 bytes are occupied by a "\033]52;c;" header, 1 byte by a "\a" footer, and
+# 99_992 bytes by the base64-encoded result of 74_994 bytes of copyable text.
+#
+# In other words, this program can only copy up to 74_994 bytes of its input.
+# However, in such cases, this program tries to bypass the input length limit
+# by copying directly to the X11 clipboard if a $DISPLAY server is available;
+# otherwise, it emits a warning (on stderr) about the number of bytes dropped.
+#
+# See http://en.wikipedia.org/wiki/Base64 for the 4*ceil(n/3) length formula.
+# See http://sourceforge.net/p/tmux/mailman/message/32221257 for copy limits.
+# See http://sourceforge.net/p/tmux/tmux-code/ci/a0295b4c2f6 for DCS in tmux.
+#
+# Written in 2014 by Suraj N. Kurapati <https://github.com/sunaku>
+# Also documented at https://sunaku.github.io/tmux-yank-osc52.html
+
+input=$( cat "$@" )
+input() { printf %s "$input" ;}
+known() { command -v "$1" >/dev/null ;}
+maybe() { known "$1" && input | "$@" ;}
+alive() { known "$1" && "$@" >/dev/null 2>&1 ;}
+
+# copy to tmux
+test -n "$TMUX" && maybe tmux load-buffer -
+
+# copy via X11
+test -n "$DISPLAY" && alive xhost && {
+  maybe xsel -i -b || maybe xclip -sel c
+}
+
+# copy via OSC 52
+printf_escape() {
+  esc=$1
+  test -n "$TMUX" -o -z "${TERM##screen*}" && esc="\033Ptmux;\033$esc\033\\"
+  printf "$esc"
+}
+len=$( input | wc -c ) max=74994
+test $len -gt $max && echo "$0: input is $(( len - max )) bytes too long" >&2
+printf_escape "\033]52;c;$( input | head -c $max | base64 | tr -d '\r\n' )\a"