67 lines
1.1 KiB
Go
67 lines
1.1 KiB
Go
package lumecmd
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import (
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"flag"
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"fmt"
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)
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func init() {
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RegisterCommand("help", Command{
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Func: HelpCmd,
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Flags: func() *flag.FlagSet {
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fs := flag.NewFlagSet("help", flag.ExitOnError)
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return fs
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}(),
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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(args CmdArgs) (int, error) {
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argv := args.Flags.Args()
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if len(argv) == 0 {
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printHelp(commandRegistry)
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} else if len(argv) >= 1 {
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printCmdHelp(argv[0])
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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) {
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var maxLen, cmdLen int
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for _, c := range commands {
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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.Printf("usage:\n lume <command> [<args...>]")
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fmt.Println()
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fmt.Println("\ncommands:")
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for _, c := range commands {
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fmt.Printf(" %-*s %s\n", maxLen, c.Name, c.Short)
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}
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}
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func printCmdHelp(name string) error {
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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.Printf("usage:\n lume %s %s\n", subCmd.Name, subCmd.Use)
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fmt.Println()
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}
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fmt.Print("flags:\n")
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subCmd.Flags.PrintDefaults()
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return nil
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}
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