Add --help option; check number of parameters, check if input file exist.

1 files changed, 36 insertions, 4 deletions

diff --git a/localvideowebencode b/localvideowebencode
index cb4b2e1..1e4cc7e 100755
--- a/localvideowebencode
+++ b/localvideowebencode
@@ -9,19 +9,39 @@
 
 set -e
 
+PRG=$(basename "$0")
+
+showhelp()	{
+	cat <<EOF
+Usage: $PRG --size SIZE [--title TITLE] INPUTFILE
+Encode video file in multiple web-optimized formats, and provide sample
+html favoring open formats with optional non-JavaScript Flash fallback.
+
+    -s, --size          Output size in WIDTHxHEIGHT
+                        (mandatory)
+    -t, --title         Title used in html fallback graphics
+                        (default: basename of input file)
+    -h, --help          This help text
+
+Examples:
+    $PRG -s 320x200 -t "Funny guy" myvideo.dv
+
+More info: http://camendesign.com/code/video_for_everybody
+EOF
+}
+
 exit1() {
 	response="${1:+Error: }${1:-Internal error!}"
 	echo >&2 "$response"
 	exit 1
 }
 
-PRG=$(basename "$0")
-
 # parse cmdline options
-TEMP="`getopt -s sh -o s:t: -l size:,title: -n "$PRG" -- "$@"`" || exit1 "Internal getopt error."
+TEMP="`getopt -s sh -o hs:t: -l help,size:,title: -n "$PRG" -- "$@"`" || exit1 "Internal getopt error."
 eval set -- "$TEMP"
 while true ; do
 	case "$1" in
+		-h|--help) showhelp; exit;;
 		-s|--size) size="$2"; shift 2;;
 		-t|--title) title="$2"; shift 2;;
 		--) shift; break;;
@@ -29,8 +49,20 @@ while true ; do
 	esac
 done
 
+if [ $# -eq 0 ]; then
+	showhelp
+	exit1 "Too few parameters!"
+fi
+
+if [ $# -gt 1 ]; then
+	showhelp
+	exit1 "Too many parameters!"
+fi
+
 # input filename (mandatory)
-infile="$1"; shift || exit1 "Input file missing!"
+infile="$1"; shift
+[ -e "$infile" ] || exit1 "Input file missing!"
+
 filebase=$(echo "$infile" | perl -pe 's/\.[^.]*//')
 
 # output size in WIDTHxHEIGHT (mandatory)