added StringSliceToMap util, performed github migration only on request

main.go

@@ -1,6 +1,20 @@
 package main
 
+import (
+	"fmt"
+	"os"
+
+	"github.com/bryanpedini/gitea-mirror-gitea/utils"
+)
+
 func main() {
+	commandLineArgumentsSlice := os.Args[1:]
+	commandLineArguments := utils.StringSliceToMap(commandLineArgumentsSlice)
+
+	if _, ok := commandLineArguments["--github"]; ok {
 		githubOrg, githubToken, giteaHost, giteaToken := "", "", "", ""
 		migrateGithubToGitea(githubOrg, githubToken, giteaHost, giteaToken)
+	} else {
+		fmt.Println("Usage: " + os.Args[0] + " [--github]")
+	}
 }

utils/sliceToMap.go

@@ -0,0 +1,13 @@
+package utils
+
+// StringSliceToMap Converts a slice of strings into a map formed by
+// keys equals to the slice values, and empty strings as map values.
+func StringSliceToMap(slice []string) map[string]string {
+	ret := make(map[string]string)
+
+	for i := 0; i < len(slice); i++ {
+		ret[slice[i]] = ""
+	}
+
+	return ret
+}