feat: add usage key in params and improve messages

params.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"flag"
 	"fmt"
 	"os"
@@ -10,16 +11,21 @@ func parseParams(meta TemplateMeta) (ctx TemplateContext, err error) {
 	result := make(map[string]*string)
 	fs := flag.NewFlagSet("params", flag.ExitOnError)
 	for key, spec := range meta.Params {
-		result[key] = fs.String(key, spec.Default, key)
+		result[key] = fs.String(key, spec.Default, spec.Usage)
 	}
 	fs.Parse(os.Args[2:])
 	ctx = make(TemplateContext)
+	message := ""
 	for key, spec := range meta.Params {
 		if spec.Required && *result[key] == "" {
-			err = fmt.Errorf("parameter '%s' required but not provided", key)
-			return
+			message += fmt.Sprintf("parameter '%s' required but not provided\n", key)
+			continue
 		}
 		ctx[key] = *result[key]
 	}
+	if message != "" {
+		message += fmt.Sprintf("Use 'mdsh %s --help' to see usage", os.Args[1])
+		return nil, errors.New(message)
+	}
 	return
 }