Use urface/cli

Author: Takumasa Sakao

go.mod

@@ -10,6 +10,7 @@ require (
 	github.com/mattn/go-runewidth v0.0.3 // indirect
 	github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d // indirect
 	github.com/smartystreets/goconvey v0.0.0-20180222194500-ef6db91d284a // indirect
+	github.com/urfave/cli v1.20.0
 	golang.org/x/text v0.3.0 // indirect
 	gopkg.in/DATA-DOG/go-sqlmock.v1 v1.3.0 // indirect
 )

go.sum

@@ -29,6 +29,8 @@ github.com/spf13/pflag v1.0.2 h1:Fy0orTDgHdbnzHcsOgfCN4LtHf0ec3wwtiwJqwvf3Gc=
 github.com/spf13/pflag v1.0.2/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
 github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+github.com/urfave/cli v1.20.0 h1:fDqGv3UG/4jbVl/QkFwEdddtEDjh/5Ov6X+0B/3bPaw=
+github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
 golang.org/x/net v0.0.0-20180921000356-2f5d2388922f h1:QM2QVxvDoW9PFSPp/zy9FgxJLfaWTZlS61KEPtBwacM=
 golang.org/x/net v0.0.0-20180921000356-2f5d2388922f/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f h1:wMNYb4v58l5UBM7MYRLPG6ZhfOqbKu7X5eyFl8ZhKvA=

main.go

@@ -9,6 +9,7 @@ import (
 	"github.com/gdamore/tcell"
 	"github.com/gdamore/tcell/encoding"
 	"github.com/sachaos/go-life/preset"
+	"github.com/urfave/cli"
 )
 
 func initScreen() tcell.Screen {
@@ -75,7 +76,16 @@ func main() {
 		ThemeWhiteAndBlack,
 	}
 
-	if err := startGame(themes, presets); err != nil {
+	app := cli.NewApp()
+	app.Name = "go-life"
+	app.Usage = "Conway's Game of Life"
+	app.Version = "0.2.0"
+
+	app.Action = func(c *cli.Context) error {
+		return startGame(themes, presets)
+	}
+
+	if err := app.Run(os.Args); err != nil {
 		fmt.Fprintf(os.Stderr, err.Error())
 		os.Exit(1)
 	}