3 files changed, 70 insertions(+), 0 deletions(-)

A COPYING
A README.md
A ntalk.sh

@@ 1,13 @@
+Copyright (C) 2025 by Aleteoryx <alyx@aleteoryx.me>
+
+Permission to use, copy, modify, and/or distribute this software for
+any purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR
+BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
+OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.

@@ 1,13 @@
+# ntalk
+
+[nanotalk][src] utils
+
+## `ntalk.sh`: simple nanotalk server
+
+meant to be run under a connection broker like socat.
+
+probably there's a chance of the file being clobbered.
+will get slower with more scrollback, cause it's just
+implemented with tail and head and wc. :P
+
+[src]: https://git.phial.org/d6/nanochat

@@ 1,44 @@
+#!/bin/sh
+
+[ $# -eq 1 ] || {
+	echo 1>&2 "usage: socat TCP-LISTEN:44322,fork EXEC:'$0 <DBFILE>'"
+	exit -1
+}
+
+DBFILE="$1"
+touch $DBFILE
+
+numlines() { wc -l <"$DBFILE"; }
+
+while read line; do
+	case "$line" in
+	(SEND\ *)
+		echo "${line##SEND\ }" >>"$DBFILE"
+		echo $(numlines) ;;
+	(SKIP\ *)
+		num="${line##SKIP\ }"
+		len=$(numlines)
+		slen=$((len - num))
+		slen=$((slen < 0 ? 0 : slen))
+		echo "$slen"
+		head -n "$len" <"$DBFILE" | tail -n "$slen"
+		echo "$len" ;;
+	(LAST\ *)
+		num="${line##LAST\ }"
+		len=$(numlines)
+		slen=$((len > num ? num : len))
+		echo "$slen"
+		head -n "$len" <"$DBFILE" | tail -n "$slen"
+		echo "$len" ;;
+	(POLL\ *)
+		len=$(($(numlines) - ${line##POLL\ }))
+		echo $((len < 0 ? 0 : len)) ;;
+	(HIST)
+		len=$(numlines)
+		echo "$len"
+		head -n "$len" <"$DBFILE"
+		echo "$len" ;;
+	(QUIT)
+		exit 0 ;;
+	esac
+done