feat(Args): allow available ffmpeg arguments to be sent to the script

bin/ios-simulator-gif

@@ -3,8 +3,63 @@
 # Records iOS simulator screen and saves as a gif to simulator.gif
 # A new file name may be passed as argument
 
-FILE_NAME=${1-simulator.gif}
+#########################
+# The command line help #
+#########################
+display_help() {
+    echo "Usage: $0 [options] {out_file}" >&2
+    echo
+    echo "   out_file                   The output file name (default: simulator.gif)"
+    echo
+    echo "   -r, --rate                 Framerate of the output (default: 6)"
+    echo "   -f, --format               Output format (default: gif)"
+    echo "   -vf, --video-filter        Video filter for ffmpeg (default: scale=320:-1)"
+    echo "   -h, --help                 Outputs this help message"
+    echo
+    exit 0
+}
 
+########################
+###   ARGS PARSING   ###
+########################
+FILE_NAME=()
+while [[ $# -gt 0 ]]
+do
+key="$1"
+
+case $key in
+    -r|--rate)
+    RATE="$2"
+    shift 2
+    ;;
+    -f|--format)
+    FORMAT="$2"
+    shift 2
+    ;;
+    -vf)
+    VIDEOFILTER="$2"
+    shift 2
+    ;;
+    -h|--help)
+    display_help
+    shift
+    ;;
+    *)    # unknown option
+    FILE_NAME+=("$1") # save it in an array for later
+    shift
+    ;;
+esac
+done
+set -- "${FILE_NAME[@]}"
+
+FILE_NAME=${FILE_NAME-simulator.gif}
+RATE=${RATE-6}
+VIDEOFILTER=${VIDEOFILTER-'scale=320:-1'}
+FORMAT=${FORMAT-gif}
+
+##################
+###   RECORD   ###
+##################
 echo 'Recording...\n\n[Press any key to stop recording]'
 
 xcrun simctl io booted recordVideo /tmp/simulator.mov &
@@ -14,7 +69,7 @@ read -n1
 kill -2 $PID
 
 echo "Converting and saving to ${FILE_NAME}\n"
-ffmpeg -i /tmp/simulator.mov -vf scale=320:-1 -r 6 -f gif -y $FILE_NAME &> /tmp/ffmpeg.log
+ffmpeg -i /tmp/simulator.mov -vf $VIDEOFILTER -r $RATE -f $FORMAT -y $FILE_NAME &> /tmp/ffmpeg.log
 
 if [[ $? -eq 0 ]]; then
   echo "Gif saved to ${FILE_NAME}"