From ed58ca219ba44bd6a9f0b013e9973fa7d4b4abd1 Mon Sep 17 00:00:00 2001
From: Stepan Koltsov <stepan.koltsov@jetbrains.com>
Date: Mon, 9 Jan 2012 20:55:44 +0400
Subject: [PATCH] better help in command line compiler

---
 .../src/org/jetbrains/jet/cli/KotlinCompiler.java | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/compiler/cli/src/org/jetbrains/jet/cli/KotlinCompiler.java b/compiler/cli/src/org/jetbrains/jet/cli/KotlinCompiler.java
index 8daf27b6cf8..9b1d16180a8 100644
--- a/compiler/cli/src/org/jetbrains/jet/cli/KotlinCompiler.java
+++ b/compiler/cli/src/org/jetbrains/jet/cli/KotlinCompiler.java
@@ -5,6 +5,8 @@ import com.sampullara.cli.Argument;
 import org.jetbrains.jet.compiler.CompileEnvironment;
 import org.jetbrains.jet.compiler.CompileEnvironmentException;
 
+import java.io.PrintStream;
+
 /**
  * @author yole
  * @author alex.tkachman
@@ -27,6 +29,12 @@ public class KotlinCompiler {
         public boolean includeRuntime;
         @Argument(value = "excludeStdlib", description = "do not load stdlib (to compile stdlib itself)")
         public boolean excludeStdlib;
+        @Argument(value = "help", alias = "h", description = "show help")
+        public boolean help;
+    }
+    
+    private static void usage(PrintStream target) {
+        target.println("Usage: KotlinCompiler [-output <outputDir>|-jar <jarFileName>] [-src <filename or dirname>|-module <module file>] [-includeRuntime] [-excludeStdlib]");
     }
 
     public static void main(String[] args) {
@@ -36,7 +44,7 @@ public class KotlinCompiler {
             Args.parse(arguments, args);
         }
         catch (IllegalArgumentException e) {
-            System.out.println("Usage: KotlinCompiler [-output <outputDir>|-jar <jarFileName>] [-src <filename or dirname>|-module <module file>] [-includeRuntime]");
+            usage(System.err);
             System.exit(1);
             return;
         }
@@ -45,6 +53,11 @@ public class KotlinCompiler {
             System.exit(1);
             return;
         }
+        
+        if (arguments.help) {
+            usage(System.out);
+            System.exit(0);
+        }
 
         CompileEnvironment environment = new CompileEnvironment();