first commit status: option and argument parsing, short aliases grouping, special values, hidden options

Option types: bool int, int-array, string, string-array, string-map, file, dir

opt-help.go

@@ -0,0 +1,30 @@
+package cli
+
+import (
+	"io"
+)
+
+type cliOptionHelp struct {
+	cliOptionBase
+}
+
+func (opt *cliOptionHelp) init() {
+}
+
+func (opt *cliOptionHelp) requiresValue() bool {
+	return false
+}
+
+func (opt *cliOptionHelp) getDefaultValue() string {
+	return ""
+}
+
+func (opt *cliOptionHelp) getTemplate() string {
+	return opt.makeOptSimpleTemplate(false, false, "")
+}
+
+func (opt *cliOptionHelp) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, err error) {
+	parser.PrintUsage()
+	err = io.EOF
+	return
+}