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Further simplifying default flag stringer func

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This commit is contained in:
Dan Buch 2016-05-02 19:58:16 -04:00
parent 6089d723a8
commit cd92adcb75
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GPG Key ID: FAEF12936DD3E3EC
1 changed files with 7 additions and 13 deletions
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20
flag.go
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@ -581,35 +581,29 @@ func stringifyFlag(f Flag) string {
}
placeholder, usage := unquoteUsage(fv.FieldByName("Usage").String())
needsPlaceholder := false
needsPlaceholder := false
defaultValueString := ""
val := fv.FieldByName("Value")
valString := ""
if val.IsValid() {
needsPlaceholder = true
defaultValueString = fmt.Sprintf(" (default: %v)", val.Interface())
if val.Kind() == reflect.String && val.String() != "" {
valString = fmt.Sprintf("%q", val.String())
} else {
valString = fmt.Sprintf("%v", val.Interface())
defaultValueString = fmt.Sprintf(" (default: %q)", val.String())
}
}
if valString != "" {
defaultValueString = valString
if defaultValueString == " (default: )" {
defaultValueString = ""
}
if needsPlaceholder && placeholder == "" {
placeholder = defaultPlaceholder
}
formattedDefaultValueString := ""
if defaultValueString != "" {
formattedDefaultValueString = fmt.Sprintf(" (default: %v)", defaultValueString)
}
usageWithDefault := strings.TrimSpace(fmt.Sprintf("%s%s", usage, formattedDefaultValueString))
usageWithDefault := strings.TrimSpace(fmt.Sprintf("%s%s", usage, defaultValueString))
return withEnvHint(fv.FieldByName("EnvVar").String(),
fmt.Sprintf("%s\t%s", prefixedNames(fv.FieldByName("Name").String(), placeholder), usageWithDefault))