program works now, added a little documentation

main.go

@@ -3,7 +3,6 @@ package main
 import (
 	"fmt"
 	"io"
-	"log"
 	"os"
 )
 
@@ -24,42 +23,26 @@ func Main(output io.Writer) int {
 	}
 
 	if conf.Listshortcuts {
-		for _, name := range Templates {
-			fmt.Println(name)
-		}
+		ListTemplates(output)
 		return 0
 	}
 
-	// FIXME: this is a slice of Template{}, turn it into a map
-	if Contains(Templates, conf.Code) {
+	if len(conf.Code) == 0 {
+		fmt.Fprintln(output, Usage)
+	}
+
+	if Exists(Templates, conf.Code) {
 		conf.Code = Templates[conf.Code]
 	}
 
 	names, err := Generate(conf.Count, conf.Code)
+	if err != nil {
+		return Die(err)
+	}
+
+	if err = PrintColumns(names, output); err != nil {
+		return Die(err)
+	}
 
 	return 0
 }
-
-func exists[K comparable, V any](m map[K]V, v K) bool {
-	if _, ok := m[v]; ok {
-		return true
-	}
-	return false
-}
-
-func Die(err error) int {
-	log.Fatal("Error", err.Error())
-
-	return 1
-}
-
-// find an item in a list, generic variant
-func Contains[E comparable](s []E, v E) bool {
-	for _, vs := range s {
-		if v == vs {
-			return true
-		}
-	}
-
-	return false
-}