vis: introduce vis-menu helper script

This serves as a wrapper around dmenu(1) and slmenu(1), by default
the latter is preferred because it also works without an X server.

The program and its default arguments can be configured by means of
the $VIS_MENU and $VIS_MENU_ARGS environment variables.

Eventually we might decide to inlcude a stripped down version of
slmenu in the vis source tree.

Makefile

@@ -78,6 +78,8 @@ install: vis
 	@mkdir -p ${DESTDIR}${PREFIX}/bin
 	@cp -f vis ${DESTDIR}${PREFIX}/bin
 	@chmod 755 ${DESTDIR}${PREFIX}/bin/vis
+	@cp -f vis-menu ${DESTDIR}${PREFIX}/bin
+	@chmod 755 ${DESTDIR}${PREFIX}/bin/vis-menu
 	@cp -f vis-open ${DESTDIR}${PREFIX}/bin
 	@chmod 755 ${DESTDIR}${PREFIX}/bin/vis-open
 	@cp -f vis-clipboard ${DESTDIR}${PREFIX}/bin

vis-menu

@@ -0,0 +1,33 @@
+#!/bin/sh
+
+PATTERN="."
+[ -z "$VIS_MENU" ] && VIS_MENU="slmenu"
+[ -z "$VIS_MENU_ARGS" ] && VIS_MENU_ARGS="-b"
+
+while [ $# -gt 0 ]; do
+	case "$1" in
+	-h|--help)
+		echo "usage: $(basename $0) [-h] [-p prompt]"
+		exit 0;
+		;;
+	-p)
+		VIS_MENU_ARGS="$VIS_MENU_ARGS -p $2"
+		shift
+		shift
+		;;
+	*)
+		break
+		;;
+	esac
+done
+
+if ! type "$VIS_MENU" >/dev/null 2>&1; then
+	if [ ! -z "$DISPLAY" ] && type "dmenu" >/dev/null 2>&1; then
+		VIS_MENU="dmenu"
+	else
+		echo "Neither slmenu nor dmenu found" >&2
+		exit 1
+	fi
+fi
+
+exec $VIS_MENU $VIS_MENU_ARGS

vis-open

@@ -1,8 +1,7 @@
 #!/bin/sh
 
 PATTERN="."
-[ -z "$VIS_MENU" ] && VIS_MENU="slmenu"
-[ -z "$VIS_MENU_ARGS" ] && VIS_MENU_ARGS="-b"
+VIS_MENU_ARGS=""
 
 while [ $# -gt 0 ]; do
 	case "$1" in
@@ -22,20 +21,11 @@ while [ $# -gt 0 ]; do
 	esac
 done
 
-if ! type "$VIS_MENU" >/dev/null 2>&1; then
-	if [ ! -z "$DISPLAY" ] && type "dmenu" >/dev/null 2>&1; then
-		VIS_MENU="dmenu"
-	else
-		echo "Neither slmenu nor dmenu found" >&2
-		exit 1
-	fi
-fi
-
 DIR=""
 [ ! -z "$PATTERN" -a "$PATTERN" != "." -a -d "$PATTERN" ] && DIR="$PATTERN"
 
 while true; do
-	SEL=$({ echo ..; ls -1 $PATTERN 2>/dev/null || echo $PATTERN; } | $VIS_MENU $VIS_MENU_ARGS)
+	SEL=$({ echo ..; ls -1 $PATTERN 2>/dev/null || echo $PATTERN; } | vis-menu $VIS_MENU_ARGS)
 	[ -z "$SEL" ] && exit 1
 	[ ! -z "$DIR" ] && SEL="$DIR/$SEL"
 	if [ -d "$SEL" ]; then