package cli import ( "io" "strings" "text/tabwriter" "text/template" "github.com/Masterminds/sprig" "github.com/containous/traefik/pkg/config/flag" "github.com/containous/traefik/pkg/config/generator" "github.com/containous/traefik/pkg/config/parser" ) const tmplHelp = `{{ .Cmd.Name }} {{ .Cmd.Description }} Usage: {{ .Cmd.Name }} [command] [flags] [arguments] Use "{{ .Cmd.Name }} [command] --help" for help on any command. {{if .SubCommands }} Commands: {{- range $i, $subCmd := .SubCommands }} {{ if not $subCmd.Hidden }} {{ $subCmd.Name }} {{ $subCmd.Description }}{{end}}{{end}} {{end}} {{- if .Flags }} Flag's usage: {{ .Cmd.Name }} [--flag=flag_argument] [-f [flag_argument]] # set flag_argument to flag(s) or: {{ .Cmd.Name }} [--flag[=true|false| ]] [-f [true|false| ]] # set true/false to boolean flag(s) Flags: {{- range $i, $flag := .Flags }} --{{ SliceIndexN $flag.Name }} {{if ne $flag.Name "global.sendanonymoususage"}}(Default: "{{ $flag.Default}}"){{end}} {{if $flag.Description }} {{ wrapWith 80 "\n\t\t" $flag.Description }} {{else}} {{- end}} {{- end}} {{- end}} ` func isHelp(args []string) bool { for _, name := range args { if name == "--help" || name == "-help" || name == "-h" { return true } } return false } // PrintHelp prints the help for the command given as argument. func PrintHelp(w io.Writer, cmd *Command) error { var flags []parser.Flat if cmd.Configuration != nil { generator.Generate(cmd.Configuration) var err error flags, err = flag.Encode(cmd.Configuration) if err != nil { return err } } model := map[string]interface{}{ "Cmd": cmd, "Flags": flags, "SubCommands": cmd.subCommands, } funcs := sprig.TxtFuncMap() funcs["SliceIndexN"] = sliceIndexN tmpl, err := template.New("flags"). Funcs(funcs). Parse(tmplHelp) if err != nil { return err } tw := tabwriter.NewWriter(w, 4, 0, 4, ' ', 0) err = tmpl.Execute(tw, model) if err != nil { return err } return tw.Flush() } func sliceIndexN(flag string) string { return strings.ReplaceAll(flag, "[0]", "[n]") }