From 172e0ac6a10957d159b0e356fc2e40677abe11b2 Mon Sep 17 00:00:00 2001
From: Cedric Beust <cedric@beust.com>
Date: Wed, 7 Oct 2015 21:39:38 -0700
Subject: [PATCH] Display usage when no args.

---
 src/main/kotlin/com/beust/kobalt/Args.kt | 5 ++++-
 src/main/kotlin/com/beust/kobalt/Main.kt | 2 ++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/main/kotlin/com/beust/kobalt/Args.kt b/src/main/kotlin/com/beust/kobalt/Args.kt
index 55633bbc..1ba48060 100644
--- a/src/main/kotlin/com/beust/kobalt/Args.kt
+++ b/src/main/kotlin/com/beust/kobalt/Args.kt
@@ -7,7 +7,7 @@ class Args {
     var targets: List<String> = arrayListOf()
 
     @Parameter(names = arrayOf("-bf", "--buildFile"), description = "The build file")
-    var buildFile: String? = null
+    var buildFile: String = "Build.kt"
 
     @Parameter(names = arrayOf("--checkVersions"), description = "Check if there are any newer versions of the " +
             "dependencies")
@@ -17,6 +17,9 @@ class Args {
             "actually running them")
     var dryRun: Boolean = false
 
+    @Parameter(names = arrayOf("--help", "--usage"), description = "Display the help")
+    var usage: Boolean = false
+
     @Parameter(names = arrayOf("-i", "--init"), description = "Create a new build file based on the current project")
     var init: Boolean = false
 
diff --git a/src/main/kotlin/com/beust/kobalt/Main.kt b/src/main/kotlin/com/beust/kobalt/Main.kt
index 484b33ef..eacf21d2 100644
--- a/src/main/kotlin/com/beust/kobalt/Main.kt
+++ b/src/main/kotlin/com/beust/kobalt/Main.kt
@@ -109,6 +109,8 @@ private class Main @Inject constructor(
             //
             Wrapper().install()
             ProjectGenerator().run(args)
+        } else if (args.usage || args.targets.isEmpty()) {
+            jc.usage()
         } else {
             if (! buildFile.exists()) {
                 jc.usage()