Add tmux detached plugin

plugins/tmux.sh

@@ -0,0 +1,22 @@
+function wish_tmux_start() {
+	return 0
+}
+
+function wish_tmux_end() {
+	return 0
+}
+
+function wish_tmux_set_colors() {
+	WISH_TMUX_FG=${WISH_TMUX_FG:-$WISH_DEFAULT_FG}
+	WISH_TMUX_BG=${WISH_TMUX_BG:-$WISH_DEFAULT_BG}
+	WISH_TMUX_SUFFIX=${WISH_TMUX_SUFFIX:-d}
+}
+
+function wish_tmux_main() {
+	local s=`tmux list-sessions 2>/dev/null | grep -vE "\(attached\)$" | wc -l`
+	if [[ $s -eq 0 ]]; then
+		wish_append $WISH_TMUX_BG $WISH_TMUX_FG $tmux
+	else
+		wish_append $WISH_TMUX_BG $WISH_TMUX_FG " $s$WISH_TMUX_SUFFIX "
+	fi
+}