Script for connecting to Playbit development console

playbit-vconsole.sh

#!/bin/sh
set -eo pipefail

SOCKFILE="$HOME/Library/Application Support/Playbit/vconsole0.sock"

while [ $# -gt 0 ]; do case "$1" in
  -h|-help|--help) cat <<END
Connect a terminal to Playbit
Usage: $0 [--help | <sockfile>]
<sockfile> defaults to $SOCKFILE
Set SOCAT=<file> to use specific socat executable instead of 'socat' in PATH
END
  exit 0;;
  -*) _err "unknown option: $1";;
  *)  [ -z "$SOCKFILE" ] || _err "unexpected argument: $1"; SOCKFILE=$1; shift;;
esac; done

[ -S "$SOCKFILE" ] ||
  _err "Playbit is not running (${SOCKFILE##$PWD/} is not a socket)"
SOCKFILE=$(realpath "$SOCKFILE")

SOCAT=${SOCAT:-}
if [ -n "$SOCAT" ]; then
  SOCAT=$(realpath "$SOCAT")
else
  SOCAT=socat
  if ! command -v socat >/dev/null; then
    echo "$0: socat not found in PATH" >&2
    echo "Get socat from http://www.dest-unreach.org/socat/"
    exit 1
  fi
fi

SOCAT_GREETING=
TERMSIZE=$(stty size 2>/dev/null)
if [ -n "$TERMSIZE" ]; then
  SOCAT_GREETING="stty rows ${TERMSIZE% *} cols ${TERMSIZE#* }; "
fi
SOCAT_GREETING="${SOCAT_GREETING}export TERM='"$TERM"'$(printf "\n")"
export SOCAT_GREETING

exec "$SOCAT" -g -t0.1 \
  -,escape=0x04,rawer,icanon=0 \
  "unix-connect:$SOCKFILE,nonblock,escape=0x04"

# Note: 0x04 is ^D, the End-of-Transmission character (EOT)
# Note: -t0.1 makes ^D exit quicker (time to wait before existing after EOF)

socat-greeting.patch

add SOCAT_GREETING feature to socat 1.7.4.4
--- a/socat.c	2022-10-30 08:21:47.000000000 -0700
+++ b/socat.c	2023-10-16 15:07:06.000000000 -0700
@@ -794,6 +794,20 @@
    int wasaction = 1;	/* last poll was active, do NOT sleep before next */
    struct timeval total_timeout;	/* the actual total timeout timer */

+	const char* greeting = getenv("SOCAT_GREETING");
+	int greeting_len = 0;
+	if (greeting) {
+		greeting_len = (int)strlen(greeting);
+		if (greeting_len > 0) {
+			// add \n to end
+			char* greeting2 = (char*)malloc(greeting_len + 2);
+			memcpy(greeting2, greeting, greeting_len);
+			greeting2[greeting_len++] = '\n';
+			greeting2[greeting_len] = '\0';
+			greeting = (const char*)greeting2;
+		}
+	}
+
 #if WITH_FILAN
    if (socat_opts.debug) {
       int fdi, fdo;
@@ -1060,6 +1074,16 @@
 	    return -1;
 	 }
 	 maywr2 = true;
+	if (greeting_len > 0 && XIO_WRITABLE(sock2)) {
+		int writt = xiowrite(sock2, greeting, greeting_len);
+		if (writt < 0) {
+			return -1;
+		}
+		greeting_len -= writt;
+		if (greeting_len > 0) {
+			greeting = &greeting[writt];
+		}
+	}
       }

       if (mayrd1 && maywr2) {