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Merge pull request #13428 from duglin/niceHelp2

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Nice help2
This commit is contained in:
David Calavera 2015-05-28 11:09:02 -07:00
commit b09240a9c3
1 changed files with 21 additions and 6 deletions
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25
mflag/flag.go
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@ -290,6 +290,7 @@ type FlagSet struct {
// The field is a function (not a method) that may be changed to point to
// a custom error handler.
Usage func()
ShortUsage func()
name string
parsed bool
@ -511,6 +512,12 @@ func (f *FlagSet) PrintDefaults() {
if runtime.GOOS != "windows" && home == "/" {
home = ""
}
// Add a blank line between cmd description and list of options
if f.FlagCount() > 0 {
fmt.Fprintln(writer, "")
}
f.VisitAll(func(flag *Flag) {
format := " -%s=%s"
names := []string{}
@ -564,6 +571,12 @@ var Usage = func() {
PrintDefaults()
}
// Usage prints to standard error a usage message documenting the standard command layout
// The function is a variable that may be changed to point to a custom function.
var ShortUsage = func() {
fmt.Fprintf(CommandLine.output, "Usage of %s:\n", os.Args[0])
}
// FlagCount returns the number of flags that have been defined.
func (f *FlagSet) FlagCount() int { return len(sortFlags(f.formal)) }
@ -1067,12 +1080,15 @@ func (cmd *FlagSet) ParseFlags(args []string, withHelp bool) error {
return err
}
if help != nil && *help {
cmd.SetOutput(os.Stdout)
cmd.Usage()
// just in case Usage does not exit
os.Exit(0)
}
if str := cmd.CheckArgs(); str != "" {
cmd.SetOutput(os.Stderr)
cmd.ReportError(str, withHelp)
cmd.ShortUsage()
os.Exit(1)
}
return nil
}
@ -1080,13 +1096,12 @@ func (cmd *FlagSet) ParseFlags(args []string, withHelp bool) error {
func (cmd *FlagSet) ReportError(str string, withHelp bool) {
if withHelp {
if os.Args[0] == cmd.Name() {
str += ". See '" + os.Args[0] + " --help'"
str += ".\nSee '" + os.Args[0] + " --help'"
} else {
str += ". See '" + os.Args[0] + " " + cmd.Name() + " --help'"
str += ".\nSee '" + os.Args[0] + " " + cmd.Name() + " --help'"
}
}
fmt.Fprintf(cmd.Out(), "docker: %s\n", str)
os.Exit(1)
fmt.Fprintf(cmd.Out(), "docker: %s.\n", str)
}
// Parsed reports whether f.Parse has been called.