add tmux-smart-multiattach.sh

tmux-smart-multiattach.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+
+host=`hostname`
+
+tmux has-session -t $host
+if [ $? -eq 1 ]; then
+	# no session, creating in daemon mode
+	tmux -u new-session -s $host -d
+	echo "created new session: $host"
+fi
+
+# session exists or we just created it, now figure out whether
+# to attach to session $host or create a new clone of it
+
+attached=`tmux list-sessions | grep attached | grep ^$host:`
+if [ ".$attached" = "." ]; then
+	# nothing attached to session $host, so attach to it
+	echo "attaching to session: $host"
+	exec tmux -u attach-session -t $host
+else
+	# session $host is attached, so create a new one
+	# we need a new name for this clone. cheap: name-pid
+	sessionname=$host-$$
+
+	echo "creating new session grouped to $host: $sessionname"
+	tmux -u new-session -t $host -s $sessionname
+
+	# getting here means client detached. delete this session
+	echo "deleting clone session: $sessionname"
+	tmux -u kill-session -t $sessionname
+fi