func TestUsageEmpty(t *testing.T) {
var args struct {
}
usage := positional.Usage(&args)
if g, e := usage, ""; g != e {
t.Errorf("unexpected usage: %q != %q", g, e)
}
}
func TestUsageMandatoryPlural(t *testing.T) {
var args struct {
Foo []string
}
usage := positional.Usage(&args)
if g, e := usage, "FOO.."; g != e {
t.Errorf("unexpected usage: %q != %q", g, e)
}
}
func TestUsageOptionalPlural(t *testing.T) {
var args struct {
positional.Optional
Foo []string
}
usage := positional.Usage(&args)
if g, e := usage, "[FOO..]"; g != e {
t.Errorf("unexpected usage: %q != %q", g, e)
}
}
func TestUsageMandatoryTwo(t *testing.T) {
var args struct {
Foo string
Bar string
}
usage := positional.Usage(&args)
if g, e := usage, "FOO BAR"; g != e {
t.Errorf("unexpected usage: %q != %q", g, e)
}
}
func ExampleUsage() {
var args struct {
Op string `positional:",metavar=ACTION"`
positional.Optional
Path []string
}
usage := positional.Usage(&args)
fmt.Printf("Usage: doit [-v] %s\n", usage)
// Output:
// Usage: doit [-v] ACTION [PATH..]
}
func TestUsageOptionalTwo(t *testing.T) {
var args struct {
positional.Optional
Foo string
Bar string
}
usage := positional.Usage(&args)
if g, e := usage, "[FOO [BAR]]"; g != e {
t.Errorf("unexpected usage: %q != %q", g, e)
}
}
// UsageTo writes a usage message for the active subcommand to the
// given Writer.
func (r *Result) UsageTo(w io.Writer) {
fmt.Fprintf(w, "Usage:\n")
cmd := r.last().cmd
var synopses []string
if s, ok := cmd.(SynopsesGetter); ok {
synopses = s.GetSynopses()
} else {
syn := []string{}
if v, ok := cmd.(VisiterAll); ok {
var opts bool
v.VisitAll(func(flag *flag.Flag) { opts = true })
if opts {
syn = append(syn, "[OPT..]")
}
}
var didArgs bool
if cmd != nil {
argsField := reflect.ValueOf(cmd).Elem().FieldByName("Arguments")
if argsField.IsValid() {
argsI := argsField.Addr().Interface()
syn = append(syn, positional.Usage(argsI))
didArgs = true
}
}
if !didArgs {
var hasSub bool
pkg := r.last().pkg
for _, subcmd := range r.parser.listSubcommands(pkg) {
if strings.HasPrefix(subcmd.pkg, pkg+"/") {
hasSub = true
}
}
if hasSub {
syn = append(syn, "COMMAND..")
}
}
synopses = []string{
strings.Join(syn, " "),
}
}
for _, s := range synopses {
fmt.Fprintf(w, " %s %s\n", r.name, s)
}
if v, ok := cmd.(VisiterAll); ok {
var header bool
v.VisitAll(func(flag *flag.Flag) {
if !header {
fmt.Fprintf(w, "\nOptions:\n")
header = true
}
fmt.Fprintf(w, " -%s=%s: %s\n", flag.Name, flag.DefValue, flag.Usage)
})
}
subs := r.parser.listSubcommands(r.last().pkg)
if len(subs) > 0 {
fmt.Fprintf(w, "\nCommands:\n")
// TODO if there's a real direct child, hide the deeper
// subcommands that are under it
// +1 for the slash
dropPrefix := len(r.last().pkg) + 1
wTab := tabwriter.NewWriter(w, 0, 0, 4, ' ', 0)
for _, c := range subs {
desc := ""
if d, ok := c.cmd.(DescriptionGetter); ok {
desc = d.GetDescription()
}
subcommand := strings.Replace(c.pkg[dropPrefix:], "/", " ", -1)
if desc != "" {
desc = "\t" + desc
}
fmt.Fprintf(wTab, " %s%s\n", subcommand, desc)
}
wTab.Flush()
}
}