From b354b42767b75d35a6684f0b20c795634e639893 Mon Sep 17 00:00:00 2001
From: Cedric Beust <cedric.beust@le.com>
Date: Thu, 30 Mar 2017 11:58:27 -0700
Subject: [PATCH] Better error message.

---
 .../kotlin/com/beust/kobalt/internal/build/BuildSources.kt     | 1 +
 src/main/kotlin/com/beust/kobalt/Options.kt                    | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/build/BuildSources.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/build/BuildSources.kt
index 830f39fc..78425f18 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/build/BuildSources.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/build/BuildSources.kt
@@ -19,6 +19,7 @@ class SingleFileBuildSources(val file: File) : IBuildSources {
     override fun exists() = file.exists()
     override fun findSourceFiles() = listOf(file)
     override val root: File = file.parentFile.parentFile.parentFile
+    override fun toString() : String = file.path
 }
 
 class BuildSources(val file: File = File("")) : IBuildSources {
diff --git a/src/main/kotlin/com/beust/kobalt/Options.kt b/src/main/kotlin/com/beust/kobalt/Options.kt
index 8751bcf1..b65e20e6 100644
--- a/src/main/kotlin/com/beust/kobalt/Options.kt
+++ b/src/main/kotlin/com/beust/kobalt/Options.kt
@@ -117,6 +117,9 @@ class Options @Inject constructor(
             //
             // Launch the build
             //
+            if (! buildSources.exists()) {
+                throw KobaltException("Could not find build file: " + buildSources)
+            }
             val runTargetResult = taskManager.runTargets(args.targets, allProjects)
             if (result == 0) {
                 result = if (runTargetResult.taskResult.success) 0 else 1