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Allow passing printHelpOnEmptyArgs to ArgParser #97

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Allow passing printHelpOnEmptyArgs to ArgParser #97

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7 changes: 6 additions & 1 deletion core/commonMain/src/ArgParser.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -103,7 +103,8 @@ open class ArgParser(
var useDefaultHelpShortName: Boolean = true,
var prefixStyle: OptionPrefixStyle = OptionPrefixStyle.LINUX,
var skipExtraArguments: Boolean = false,
var strictSubcommandOptionsOrder: Boolean = false
var strictSubcommandOptionsOrder: Boolean = false,
var printHelpOnEmptyArgs: Boolean = false
) {

/**
Expand Down Expand Up @@ -532,6 +533,10 @@ open class ArgParser(
protected fun parse(args: List<String>): ArgParserResult {
check(parsingState == null) { "Parsing of command line options can be called only once." }

if (args.isEmpty() && printHelpOnEmptyArgs) {
outputAndTerminate(makeUsage(), 0)
}

// Add help option.
val helpDescriptor = if (useDefaultHelpShortName) OptionDescriptor<Boolean, Boolean>(
optionFullFormPrefix,
Expand Down