src/main.sh: Add option parsing

1 files changed, 56 insertions, 1 deletions

diff --git a/src/main.sh b/src/main.sh
index 35156b3..c62262e 100644
--- a/src/main.sh
+++ b/src/main.sh
@@ -15,8 +15,63 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+usage()
+{
+	printf 'Usage: %s [option ...]\n' "${0}"
+}
+
+help()
+{
+	usage
+	cat <<EOF
+Options:
+  -h            Display this information
+  -V            Display version information
+  -i {cli|tui}  Select either a textual user interface or a command line
+                interface (default: cli)
+EOF
+}
+
+version()
+{
+	cat <<EOF
+firman ${PACKAGE_VERSION}
+Copyright (C) 2015  Patrick "P. J." McDermott
+License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.
+EOF
+}
+
 main()
 {
-	init_ui 'cli'
+	local opt=
+	local ui='cli'
+
+	unset OPTARG
+	while getopts 'hVi:' opt; do
+		case "${opt}" in
+			'h')
+				help
+				exit
+				;;
+			'V')
+				version
+				exit
+				;;
+			'i')
+				ui="${OPTARG}"
+				;;
+		esac
+		unset OPTARG
+	done
+	shift $(($OPTIND - 1))
+
+	if [ ${#} -ne 0 ]; then
+		usage >&2
+		exit 1
+	fi
+
+	init_ui "${ui}"
 	info 'Hello, world!'
 }