88 lines
1.5 KiB
Go
88 lines
1.5 KiB
Go
package lumecmd
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import (
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"fmt"
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"sort"
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"strings"
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)
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func NewCmdHelp() Command {
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return Command{
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Name: "help",
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Func: HelpCmd,
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Use: "<command>",
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Short: "Show help for a command",
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}
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}
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func HelpCmd(ctx Context) (int, error) {
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if len(ctx.Args) == 0 {
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fmt.Print(printHelp(commandRegistry))
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} else if len(ctx.Args) >= 1 {
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if cmdHelp, err := printCmdHelp(ctx.Args[0]); err == nil {
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fmt.Print(cmdHelp)
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} else {
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fmt.Print(err)
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}
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}
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return ExitSuccess, nil
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}
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func printHelp(commands map[string]Command) string {
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var b strings.Builder
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var maxLen, cmdLen int
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var keys []string
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for _, c := range commands {
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keys = append(keys, c.Name)
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cmdLen = len(c.Name)
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if cmdLen > maxLen {
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maxLen = cmdLen
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}
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}
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fmt.Fprintf(&b, "usage:\n lume <command> [<args...>]")
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fmt.Fprintln(&b)
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fmt.Fprintln(&b, "\ncommands:")
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sort.Strings(keys)
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for _, k := range keys {
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c := commands[k]
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fmt.Fprintf(&b, " %-*s %s\n", maxLen, c.Name, c.Short)
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}
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return b.String()
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}
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func printCmdHelp(name string) (string, error) {
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var b strings.Builder
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subCmd, ok := commandRegistry[name]
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if !ok {
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return "", fmt.Errorf("unknown commnnd: %s\n", name)
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}
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if subCmd.Use != "" {
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fmt.Fprintf(&b, "usage:\n lume %s %s\n", subCmd.Name, subCmd.Use)
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} else {
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fmt.Fprintf(&b, "usage:\n lume %s\n", subCmd.Name)
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}
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if subCmd.Flags != nil {
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out := subCmd.Flags.Output()
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defer subCmd.Flags.SetOutput(out)
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fmt.Fprintln(&b)
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fmt.Fprint(&b, "flags:\n")
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subCmd.Flags.SetOutput(&b)
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subCmd.Flags.PrintDefaults()
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}
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return b.String(), nil
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}
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