diff options
Diffstat (limited to 'command/help.go')
| -rw-r--r-- | command/help.go | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/command/help.go b/command/help.go index cb22ce50..5bf58f6a 100644 --- a/command/help.go +++ b/command/help.go @@ -1,6 +1,7 @@ package command import ( + "bytes" "errors" "fmt" "io" @@ -13,14 +14,31 @@ var ErrHelp = errors.New("help requested") func (n *node) PrintHelp() { _ = n.writeHelp() } func (n *node) writeHelp() error { + prefix := strings.Join(append(n.prefix, n.name), " ") + var buf strings.Builder + offset := 7 + len(prefix) + line := offset + 14 + w := bytes.Repeat([]byte{' '}, offset+1) + w[0] = '\n' + + for _, flag := range n.suffix { + line += len(flag) + 1 + if line >= 80 { + line = offset + len(flag) + 1 + buf.Write(w) + } + buf.WriteByte(' ') + buf.WriteString(flag) + } + if _, err := fmt.Fprintf(n.out, - "\nUsage:\t%s [-h | --help]%s COMMAND [OPTIONS]\n", - strings.Join(append(n.prefix, n.name), " "), &n.suffix, + "usage: %s [-h | --help]%s <command> [<args>]\n", + prefix, &buf, ); err != nil { return err } if n.child != nil { - if _, err := fmt.Fprint(n.out, "\nCommands:\n"); err != nil { + if _, err := fmt.Fprint(n.out, "\ncommands:\n"); err != nil { return err } } |