Merge pull request #98 from devlights/add-all-option

Add -list option

Author: devlights

cmd/trygolang/main.go

@@ -7,6 +7,7 @@ import (
 	"github.com/devlights/try-golang/lib"
 	"log"
 	"os"
+	"sort"
 	"strings"
 )
 
@@ -16,13 +17,36 @@ func init() {
 	mapping.MakeMapping()
 }
 
+func printAllExampleNames() {
+	names := make([]string, 0, len(mapping))
+
+	for k := range mapping {
+		names = append(names, k)
+	}
+
+	sort.Slice(names, func(i, j int) bool {
+		return names[i] < names[j]
+	})
+
+	fmt.Println("[Examples]")
+	for _, v := range names {
+		fmt.Printf("\t%s\n", v)
+	}
+}
+
 func main() {
 	var (
-		onetime = flag.Bool("onetime", false, "run only one time")
+		onetime   = flag.Bool("onetime", false, "run only one time")
+		showNames = flag.Bool("list", false, "show all example names")
 	)
 
 	flag.Parse()
 
+	if *showNames {
+		printAllExampleNames()
+		return
+	}
+
 	fmt.Print("ENTER EXAMPLE NAME: ")
 
 	stdinScanner := bufio.NewScanner(os.Stdin)