70 lines
1.2 KiB
Go
70 lines
1.2 KiB
Go
package lumecmd
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import (
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"fmt"
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"sort"
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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(args CmdArgs) (int, error) {
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if len(args.Args) == 0 {
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printHelp(commandRegistry)
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} else if len(args.Args) >= 1 {
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printCmdHelp(args.Args[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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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.Printf("usage:\n lume <command> [<args...>]")
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fmt.Println()
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fmt.Println("\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.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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} else {
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fmt.Printf("usage:\n lume %s\n", subCmd.Name)
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}
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if subCmd.Flags != nil {
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fmt.Println()
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fmt.Print("flags:\n")
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subCmd.Flags.PrintDefaults()
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}
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return nil
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}
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