added program name and description to the help output

cli-usage.go

@@ -11,6 +11,12 @@ func (cli *CliParser) Usage() string {
 	var sb strings.Builder
 
 	program, _ := cli.GetVersionSection("program")
+	fmt.Fprint(&sb, "NAME", program)
+	if cli.description != "" {
+		fmt.Fprint(&sb, "-", cli.description)
+	}
+	sb.WriteByte('\n')
+
 	publicCount := cli.publicOptionCount()
 	if publicCount > 0 {
 		fmt.Fprintf(&sb, "USAGE: %s [<options>] %s\n", program, cli.getArgsTemplate())

cli.go

@@ -2,6 +2,7 @@ package cli
 
 import (
 	"fmt"
+	"strings"
 )
 
 type CliOptionTracer interface {
@@ -38,17 +39,33 @@ type OptReference interface {
 }
 
 type CliParser struct {
-	version  string
-	options  []cliOptionParser
-	argSpecs []argSpec
-	cliArgs  []string
+	description string
+	version     string
+	options     []cliOptionParser
+	argSpecs    []argSpec
+	cliArgs     []string
 }
 
-func (cli *CliParser) Init(argv []string, version string) {
+func (cli *CliParser) Init(argv []string, version string, description string) {
 	cli.version = version
+	cli.description = description
 	cli.cliArgs = argv
 }
 
+func (cli *CliParser) GetOption(name string) (ref OptReference) {
+	var opt cliOptionParser
+	if strings.HasPrefix(name, "-") {
+		opt = cli.findOptionByArg(name)
+	} else {
+		opt = cli.findOptionByName(name)
+	}
+	if opt != nil {
+		ref = opt.(OptReference)
+	}
+	return ref
+
+}
+
 func (cli *CliParser) SetIncompatibleOption(optName string, incompatibleOptNames ...string) error {
 	var opti cliOptionParser
 	if opti = cli.findOptionByName(optName); opti == nil {