From c888d26e6e901d56bfb5964adff833888fe600e5 Mon Sep 17 00:00:00 2001
From: Tjerk Wolterink <tjerkw@users.noreply.github.com>
Date: Wed, 15 Feb 2023 10:06:45 +0100
Subject: [PATCH] Allow passing printHelpOnEmptyArgs to ArgParser

This makes it easier to use the commands, cause it will print the help text when you set printHelpOnEmptyArgs = true
---
 core/commonMain/src/ArgParser.kt | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/core/commonMain/src/ArgParser.kt b/core/commonMain/src/ArgParser.kt
index 0338bec..60b6782 100644
--- a/core/commonMain/src/ArgParser.kt
+++ b/core/commonMain/src/ArgParser.kt
@@ -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
 ) {
 
     /**
@@ -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,