From c88cf536b066f20e2d02433abfffb859e8deac17 Mon Sep 17 00:00:00 2001
From: Joe Rayhawk <jrayhawk@fairlystable.org>
Date: Mon, 16 Dec 2024 17:52:15 -0800
Subject: bin/clipsync3: new wlrootx<->x11 clipboard bridge

---
 bin/clipsync3.sh | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100755 bin/clipsync3.sh

diff --git a/bin/clipsync3.sh b/bin/clipsync3.sh
new file mode 100755
index 0000000..2298d46
--- /dev/null
+++ b/bin/clipsync3.sh
@@ -0,0 +1,51 @@
+#!/bin/sh
+# Scan for wlroots and x11 clipboard events and synchronize text strings.
+# Requirements:
+#  clipnotify   https://github.com/cdown/clipnotify (xfixes clipboard events)
+#  wl-clipboard https://github.com/bugaevc/wl-clipboard
+#  xclip        https://github.com/astrand/xclip
+
+# non-text TARGET/mimetype negotiation requires a more complicated protocol
+# bridge than what xclip and wl-clipboard can be expected to provide.
+# To see the scope of the problem for a given selection:
+#   xclip -t TARGETS -o
+#   wl-paste -l
+
+set -e
+set -x # debug
+#PS4='+ $(sleep .1)' # debug
+
+differ() { [ x"$new" != x"$old" ]; }
+wcp() { printf "%s" "$new" | wl-copy -p; }
+wcc() { printf "%s" "$new" | wl-copy; }
+xcp() { printf "%s" "$new" | xclip -selection primary; }
+#xcc() { printf "%s" "$new" | xclip -selection clipboard; } # why is this broken?
+xcc() { true; }
+
+fifo="${XDG_RUNTIME_DIR:-/tmp}/clipsync-$WAYLAND_DISPLAY-$DISPLAY.sock"
+mkfifo   "$fifo" # unified event stream to prevent multi-process feedback loops
+
+# ensure we kill our whole subprocess group on shutdown
+trap "trap - TERM; rm $fifo; kill -- -$$;" INT TERM EXIT # rewrite trap so it doesn't recurse
+
+exec 3<> "$fifo" # open as fd 3
+#rm       "$fifo" # we don't technically use the link anymore, but it *is* useful as lockfile
+
+wl-paste           --watch        echo wc       >&3 & wcpid=$!; read -r spam <&3; unset spam
+wl-paste --primary --watch        echo wp       >&3 & wppid=$!; read -r spam <&3; unset spam
+while clipnotify -s primary  ; do echo xp; done >&3 & xppid=$!
+#while clipnotify -s clipboard; do echo xc; done >&3 & xcpid=$! # why is this broken?
+
+while read -r event <&3; do
+  case "$event" in
+    (wc) new="$( wl-paste -n                   )"; differ && (      wcp; xcc; xcp; ) ;;
+    (wp) new="$( wl-paste -n --primary         )"; differ && ( wcc;      xcc; xcp; ) ;;
+    (xc) new="$( xclip -o -selection clipboard )"; differ && ( wcc; wcp;      xcp; ) ;;
+    (xp) new="$( xclip -o -selection primary   )"; differ && ( wcc; wcp; xcc;      ) ;;
+  esac
+  old="$new"
+done
+
+# if further process management is needed:
+#kill   $wcpid $wppid $xppid $xcpid
+#disown $wcpid $wppid $xppid $xcpid
-- 
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