From 54ec63e3fde0fc3cd86d27436570a01ed615bb56 Mon Sep 17 00:00:00 2001
From: Cedric Beust <cedric@beust.com>
Date: Thu, 24 Dec 2015 22:03:13 +0400
Subject: [PATCH] Null checksums if the directory doesn't exist.

---
 .../main/kotlin/com/beust/kobalt/maven/Md5.kt | 42 +++++++++++--------
 1 file changed, 25 insertions(+), 17 deletions(-)

diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/maven/Md5.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/maven/Md5.kt
index 7693a9ea..850b2451 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/maven/Md5.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/maven/Md5.kt
@@ -9,33 +9,41 @@ import javax.xml.bind.DatatypeConverter
 public class Md5 {
     companion object {
 //        private fun md5(file: File) : String {
+//            if (file.isDirectory) {
+//                println("PROBLEM")
+//            }
 //            val md5 = MessageDigest.getInstance("MD5")
 //            val bytes = file.readBytes()
 //            md5.update(bytes, 0, bytes.size)
 //            return DatatypeConverter.printHexBinary(md5.digest()).toLowerCase()
 //        }
 
-        fun toMd5Directories(directories: List<File>) : String {
-            MessageDigest.getInstance("MD5").let { md5 ->
-                directories.forEach { file ->
-                    if (file.isFile) {
-                        val bytes = file.readBytes()
-                        md5.update(bytes, 0, bytes.size)
-                    } else {
-                        val files = KFiles.findRecursively(file) // , { f -> f.endsWith("java")})
-                        log(2, "  Calculating checksum of ${files.size} files in $file")
-                        files.map {
-                            File(file, it)
-                        }.filter {
-                            it.isFile
-                        }.forEach {
-                            val bytes = it.readBytes()
+        fun toMd5Directories(directories: List<File>) : String? {
+            val ds = directories.filter { it.exists() }
+            if (ds.size > 0) {
+                MessageDigest.getInstance("MD5").let { md5 ->
+                    directories.filter { it.exists() }.forEach { file ->
+                        if (file.isFile) {
+                            val bytes = file.readBytes()
                             md5.update(bytes, 0, bytes.size)
+                        } else {
+                            val files = KFiles.findRecursively(file) // , { f -> f.endsWith("java")})
+                            log(2, "  Calculating checksum of ${files.size} files in $file")
+                            files.map {
+                                File(file, it)
+                            }.filter {
+                                it.isFile
+                            }.forEach {
+                                val bytes = it.readBytes()
+                                md5.update(bytes, 0, bytes.size)
+                            }
                         }
                     }
+                    val result = DatatypeConverter.printHexBinary(md5.digest()).toLowerCase()
+                    return result
                 }
-                val result = DatatypeConverter.printHexBinary(md5.digest()).toLowerCase()
-                return result
+            } else {
+                return null
             }
         }