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Add --help support for subcommands #178

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Add --help support for subcommands #178

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39 changes: 32 additions & 7 deletions mainargs/src/Parser.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -23,10 +23,11 @@ class ParserForMethods[B](val mains: MethodMains[B]) {
customNames: Map[String, String] = Map(),
customDocs: Map[String, String] = Map(),
sorted: Boolean = true,
nameMapper: String => Option[String] = Util.kebabCaseNameMapper
nameMapper: String => Option[String] = Util.kebabCaseNameMapper,
mainMethods: Seq[MainData[Any, B]] = mains.value
): String = {
Renderer.formatMainMethods(
mains.value,
mainMethods,
totalWidth,
docsOnNewLine,
customNames,
Expand All @@ -36,6 +37,33 @@ class ParserForMethods[B](val mains: MethodMains[B]) {
)
}

def handlePrintAndExit(
autoPrintHelpAndExit: Option[(Int, PrintStream)],
args: Seq[String],
totalWidth: Int,
docsOnNewLine: Boolean,
customNames: Map[String, String],
customDocs: Map[String, String],
sorted: Boolean,
nameMapper: String => Option[String]
): Unit = {
autoPrintHelpAndExit.foreach { case (exitCode, outputStream) =>
val mainHelp = args.headOption.contains("--help")
val subcommand = mains.value.find(main => args.headOption.contains(main.name(nameMapper)))
val subcommandHelp = subcommand.isDefined && args.lift(1).contains("--help")

if (mainHelp || subcommandHelp) {
val text = if (mainHelp) {
helpText(totalWidth, docsOnNewLine, customNames, customDocs, sorted, nameMapper)
} else {
helpText(totalWidth, docsOnNewLine, customNames, customDocs, sorted, nameMapper, subcommand.toSeq)
}
outputStream.println(text)
Compat.exit(exitCode)
}
}
}

@deprecated("Binary compatibility shim, use other overload instead", "mainargs after 0.3.0")
private[mainargs] def helpText(
totalWidth: Int,
Expand Down Expand Up @@ -171,11 +199,8 @@ class ParserForMethods[B](val mains: MethodMains[B]) {
sorted: Boolean = true,
nameMapper: String => Option[String] = Util.kebabCaseNameMapper
): Either[String, Any] = {
if (autoPrintHelpAndExit.nonEmpty && args.take(1) == Seq("--help")) {
val (exitCode, outputStream) = autoPrintHelpAndExit.get
outputStream.println(helpText(totalWidth, docsOnNewLine, customNames, customDocs, sorted, nameMapper))
Compat.exit(exitCode)
} else runRaw0(args, allowPositional, allowRepeats, nameMapper) match {
handlePrintAndExit(autoPrintHelpAndExit, args, totalWidth, docsOnNewLine, customNames, customDocs, sorted, nameMapper)
runRaw0(args, allowPositional, allowRepeats, nameMapper) match {
case Left(err) => Left(Renderer.renderEarlyError(err))
case Right((main, res)) =>
res match {
Expand Down