Provide an option to override the config directory.

Fixes #44.

README.md

@@ -16,7 +16,7 @@ Install requirements by running e.g. `apt-get install ffmpeg mediainfo` (Debian)
 Usage
 -----
 ```
-./chromecastize.sh [--mp4 | --mkv] <videofile1> [videofile2 ...]
+./chromecastize.sh [--mp4 | --mkv | --config=/path/to/config] <videofile1> [videofile2 ...]
 ```
 
 ### Examples:
@@ -26,6 +26,7 @@ Usage
 ### Options:
 - `--mp4` forces conversion to MPEG-4 container
 - `--mkv` forces conversion to Matroska container
+- `--config=/path/to/config` specify where to store configuration. When omitted the default folder `~/.chromecastize` is used.
 
 Authors
 -------

chromecastize.sh

@@ -3,7 +3,7 @@
 ##########
 # CONFIG #
 ##########
-HOME=~/.chromecastize
+CONFIG_DIRECTORY=~/.chromecastize
 SUPPORTED_EXTENSIONS=('mkv' 'avi' 'mp4' '3gp' 'mov' 'mpg' 'mpeg' 'qt' 'wmv' 'm2ts' 'flv')
 
 SUPPORTED_GFORMATS=('MPEG-4' 'Matroska')
@@ -39,13 +39,18 @@ in_array() {
 }
 
 print_help() {
-	echo "Usage: chromecastize.sh [ --mp4 | --mkv ] <videofile1> [ videofile2 ... ]"
+	echo "Usage: chromecastize.sh [--mp4 | --mkv | --config=/path/to/config/] <videofile1> [videofile2 ...]"
 }
 
 unknown_codec() {
 	echo "'$1' is an unknown codec. Please add it to the list in a CONFIG section."
 }
 
+missing_config_directory() {
+	echo 'Missing config directory.'
+	print_help
+}
+
 is_supported_gformat() {
 	if in_array "$1" "${SUPPORTED_GFORMATS[@]}"; then
 		return 0
@@ -90,7 +95,7 @@ is_supported_ext() {
 
 mark_as_good() {
 	# add file as successfully converted
-	echo `$REALPATH "$1"` >> $HOME/processed_files
+	echo `$REALPATH "$1"` >> "$PROCESSED_FILES"
 }
 
 on_success() {
@@ -127,7 +132,7 @@ process_file() {
 	fi
 
 	# test if it's an `chromecastize` generated file
-	if grep -Fxq "`$REALPATH "$FILENAME"`" $HOME/processed_files; then
+	if grep -Fxq "`$REALPATH "$FILENAME"`" "$PROCESSED_FILES"; then
 		echo '- file was generated by `chromecastize`, skipping'
 		return
 	fi
@@ -202,20 +207,83 @@ if [ -z $REALPATH ]; then
 	exit 1
 fi
 
-# check number of arguments
+# Output help if no arguments were passed.
 if [ $# -lt 1 ]; then
 	print_help
 	exit 1
 fi
 
-# ensure that processed_files file exists
-mkdir -p $HOME
-touch $HOME/processed_files
+# Process options.
+while :; do
+	case $1 in
+		-h|-\?|--help)
+			print_help
+			exit 0
+			;;
+		--mkv|--mp4)
+			OVERRIDE_GFORMAT=${1:2}
+			;;
+		--config=?*)
+			CONFIG_DIRECTORY=${1#*=}
+			;;
+		--config=)
+			missing_config_directory
+			exit 1
+			;;
+		--config)
+			if [ "$2" ]; then
+				CONFIG_DIRECTORY=$2
+				shift
+			else
+				missing_config_directory
+				exit 1
+			fi
+			;;
+                # Ends all options. Everything that follows is considered a
+		# filename.
+		--)
+			shift
+			break
+			;;
+		-?*)
+			echo "Unknown option $1"
+			print_help
+			exit 1
+			;;
+		*)
+			break
+	esac
+	shift
+done
+
+# Ensure that our config directory exists and is writable.
+if ! [ -e "$CONFIG_DIRECTORY" ]; then
+	if ! mkdir -p "$CONFIG_DIRECTORY" &> /dev/null; then
+		echo "Config directory $CONFIG_DIRECTORY does not exist and could not be created."
+		exit 1
+	fi
+fi
+
+if ! [ -d "$CONFIG_DIRECTORY" ]; then
+	echo "Supplied config directory $CONFIG_DIRECTORY is not a directory."
+	exit 1
+fi
+
+if ! [ -w "$CONFIG_DIRECTORY" ]; then
+	echo "Config directory $CONFIG_DIRECTORY is not writeable."
+	exit 1
+fi
+
+# Ensure that the processed file list exists and is writeable.
+PROCESSED_FILES="$CONFIG_DIRECTORY/processed_files"
+if ! touch "$PROCESSED_FILES" &> /dev/null || ! [ -f "$PROCESSED_FILES" ] || ! [ -w "$PROCESSED_FILES" ]; then
+	echo "Could not write to settings file $PROCESSED_FILES."
+	exit 1
+fi
 
+# Process files.
 for FILENAME in "$@"; do
-	if [ "$FILENAME" = "--mp4" ] || [ "$FILENAME" = "--mkv" ]; then
-		OVERRIDE_GFORMAT=`echo "$FILENAME" | sed 's/^--//'`
-	elif ! [ -e "$FILENAME" ]; then
+	if ! [ -e "$FILENAME" ]; then
 		echo "File not found ($FILENAME). Skipping..."
 	elif [ -d "$FILENAME" ]; then
 		ORIG_IFS=$IFS