make help more useful

joshuarubin · Jun 17, 2015 · 78b5a56 · 78b5a56
1 parent bfc2813
commit 78b5a56
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/.gitignore b/.gitignore
@@ -1,3 +1,4 @@
 /primes
 /.acc.out
 /.coveralls-stamp
+/cmd/primes/primes
diff --git a/cmd/primes/main.go b/cmd/primes/main.go
@@ -30,7 +30,7 @@ func join(slice []uint64, sep string) string {
 func init() {
 	app.Name = "primes"
 	app.Version = "1.0.0"
-	app.Usage = "primes <int> <int>"
+	app.Usage = "primes [-p] <int> <int>"
 	app.Authors = []cli.Author{
 		{Name: "Joshua Rubin", Email: "jrubin@zvelo.com"},
 	}
@@ -46,7 +46,8 @@ func init() {
 
 func before(c *cli.Context) error {
 	if len(c.Args()) < 2 {
-		fmt.Println("need two integers")
+		cli.ShowAppHelp(c)
+		fmt.Println("missing one or both integers")
 		os.Exit(1)
 	}