vis: add a file open dialog

For this to work make sure you have vis-open and slmenu or dmenu
somewhere in $PATH.

For now the file dialog is shown for :open, :split and :vsplit
when the argument is either . (a dot) or looks like a file pattern.

For example

 :open *.[ch]

will show a listing of all C source and header files in the current
directory. Use a fuzzy search to make your choice.

1 files changed, 47 insertions, 0 deletions

diff --git a/vis-open b/vis-open
new file mode 100755
index 0000000..0bcdd5c
--- /dev/null
+++ b/vis-open
@@ -0,0 +1,47 @@
+#!/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: $0 [-h] [-p prompt] [file-pattern]"
+		exit 0;
+		;;
+		-p)
+		VIS_MENU_ARGS="$VIS_MENU_ARGS -p $2"
+		shift
+		shift
+		;;
+		*)
+		PATTERN=$*
+		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"
+		exit 1
+	fi
+fi
+
+DIR=""
+
+while true; do
+	SEL=$({ echo ..; ls -1 $PATTERN; } | $VIS_MENU $VIS_MENU_ARGS)
+	[ -z "$SEL" ] && exit 1
+	[ ! -z "$DIR" ] && SEL="$DIR/$SEL"
+	if [ -d "$SEL" ]; then
+		DIR="$SEL"
+		PATTERN="$DIR"
+	else
+		echo "$SEL"
+		exit 0
+	fi
+done