new /v2 subdirectory

v2/arg-base.go

@@ -0,0 +1,40 @@
+package cli
+
+import (
+	"strings"
+)
+
+type argSpec interface {
+	getBase() *argBase
+	parse(cli *CliParser, specIndex int, args []string, argIndex int) (consumedArgs int, err error)
+}
+
+type argBase struct {
+	name        string
+	description string
+	required    bool
+	repeat      bool
+}
+
+// -------------- Argument Template functions  ----------------
+func (cli *CliParser) getArgTemplate(spec argSpec) (templ string) {
+	arg := spec.getBase()
+	templ = "<" + arg.name + ">"
+	if arg.repeat {
+		templ += " ..."
+	}
+	if !arg.required {
+		templ = "[" + templ + "]"
+	}
+	return
+}
+
+func (cli *CliParser) getArgsTemplate() (argsTemplate string) {
+	templates := make([]string, len(cli.argSpecs))
+	for i, argSpec := range cli.argSpecs {
+		templates[i] = cli.getArgTemplate(argSpec)
+	}
+
+	argsTemplate = strings.Join(templates, " ")
+	return
+}