Added simple man page support

help.go

@@ -44,6 +44,32 @@ OPTIONS:
    {{end}}
 `
 
+var ManPageTemplate = `.\"             -*-Nroff-*-
+.\"
+.TH "{{.Name}}" 1 "{{.Compiled.Day}} {{.Compiled.Month}} {{.Compiled.Year}}" "" ""
+.SH NAME
+{{.Name}} \- {{.Usage}}
+.SH SYNOPSIS
+.B {{.Name}}
+.nf
+command {{.Name}} [command options] [arguments...]
+.fi
+.SH COMMANDS
+.nf
+{{range .Commands}}{{.Name}}{{with .ShortName}}, {{.}}{{end}}{{ "\t" }}{{.Usage}}
+{{end}}
+.fi
+.SH OPTIONS
+.nf
+{{range .Flags}}{{.}}
+{{end}}
+.fi
+.SH VERSION
+.B {{.Version}}
+.SH AUTHOR
+.B {{.Name}} was written by {{.Author}} <{{.Email}}>
+`
+
 var helpCommand = Command{
 	Name:      "help",
 	ShortName: "h",
@@ -63,6 +89,11 @@ func ShowAppHelp(c *Context) {
 	printHelp(AppHelpTemplate, c.App)
 }
 
+// Generates (prints) man page for the App
+func GenerateManPage(c *Context) {
+	printHelp(ManPageTemplate, c.App)
+}
+
 // Prints help for the given command
 func ShowCommandHelp(c *Context, command string) {
 	for _, c := range c.App.Commands {
@@ -83,7 +114,10 @@ func ShowVersion(c *Context) {
 func printHelp(templ string, data interface{}) {
 	w := tabwriter.NewWriter(os.Stdout, 0, 8, 1, '\t', 0)
 	t := template.Must(template.New("help").Parse(templ))
-	t.Execute(w, data)
+	err := t.Execute(w, data)
+	if err != nil {
+		panic(err)
+	}
 	w.Flush()
 }