From 1a126c45fe808efae7e0c9a20b9d014af20e8866 Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@jerkface.net>
Date: Thu, 1 Aug 2024 09:55:49 -0400
Subject: much improved terminal and signal handling

---
 twopane.bash | 51 ++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 40 insertions(+), 11 deletions(-)

diff --git a/twopane.bash b/twopane.bash
index f3aff57..91b9f1a 100644
--- a/twopane.bash
+++ b/twopane.bash
@@ -58,42 +58,71 @@ title 'input'
 source "$TWOPANE"/screenrc.startpane
 .
 
-TWOPANE_FUNCTION_EXPORTS='restart sendp sendc send start'
 restart()
 {
         screen -X source "$TWOPANE"/screenrc.restart
 }
 sendp()
 {
-        socat -u STDIN UNIX-SENDTO:"$TWOPANE"/socket
+        trap "kill -SIGUSR1 $1" EXIT
+        socat -u STDIN UNIX-SENDTO:"$TWOPANE"/socket || restart
 }
 sendc()
 {
-        [ "${COPROC[1]}" ] || coproc sendp
+        [ "${COPROC[1]}" ] || coproc { sendp $$; }
         printf '%s' "$*" >&${COPROC[1]}
 }
 send()
 {
-        [ "${COPROC[1]}" ] || coproc sendp
+        [ "${COPROC[1]}" ] || coproc { sendp $$; }
         printf '%s' "$*"$'\n' >&${COPROC[1]}
 }
+
+sendcc() { sendc $'\003'; }
+
+raw()
+{
+        stty_opts=(
+                cbreak
+                raw
+                -isig
+                -iexten
+                -nl
+                intr    undef
+                quit    undef
+               #erase   undef
+               #kill    undef
+                eof     undef
+                start   undef
+                stop    undef
+                susp    undef
+                lnext   undef
+        )
+        stty "${stty_opts[@]}"
+}
+
 start()
 {
-        [ "${COPROC[1]}" ] || coproc sendp
-        while read -r -N1 </dev/tty
+        trap ': SIGPIPE ${COPROC[@]@A}' SIGPIPE
+        trap ': SIGCHLD ${COPROC[@]@A}' SIGCHLD
+        trap ': SIGUSR1 ${COPROC[@]@A}; COPROC=()' SIGUSR1
+        raw
+        while read -r -N1 || [ $? -gt 128 ]
         do
-                [ "${COPROC[1]}" ] || break
-                printf '%s' "$REPLY"
-        done >&${COPROC[1]}
+                if [ "$REPLY" ]
+                then
+                        sendc "$REPLY"
+                fi
+        done
 }
 
 save_file bashrc <<.
 set -f
+set -b
 set -o pipefail
 shopt -s lastpipe
-trap 'COPROC=()' SIGPIPE
 trap "screen -X quit" EXIT
-$(declare -f $TWOPANE_FUNCTION_EXPORTS | sed 's/ COPROC / /')
+$(declare -f)
 export PS1="$BOT_TITLE\$ "
 \$BOT_CMD
 .
-- 
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