Avoid crashing if no game is provided

Improve log file path creation.

Author: danieledapo

cmd/gork/main.go

@@ -5,6 +5,7 @@ import (
 "io/ioutil"
 "log"
 "os"
+"path"
 "strings"
 
 "github.com/d-dorazio/gork/gork"
@@ -13,6 +14,7 @@ import (
 func main() {
 if len(os.Args) < 2 {
 fmt.Println("Please provide a game")
+return
 }
 
 story := os.Args[1]
@@ -22,7 +24,7 @@ func main() {
 panic(err)
 }
 
-logfile, err := os.Create(strings.Split(story, ".")[0] + ".log")
+logfile, err := os.Create(storyLogFilename(story))
 if err != nil {
 panic(err)
 }
@@ -35,6 +37,13 @@ func main() {
 header := gork.NewZHeader(mem)
 
 gork.NewZMachine(mem, header, gork.ZTerminal{}).InterpretAll()
+}
 
-fmt.Println("")
+func storyLogFilename(story string) string {
+name := path.Base(story)
+tmp := strings.Split(name, ".")
+if len(tmp) > 1 {
+name = tmp[0]
+}
+return name + ".log"
 }