From c2c4a156debe52c619e1cca8e878f75c21b5de0b Mon Sep 17 00:00:00 2001
From: Cedric Beust <cedric@beust.com>
Date: Fri, 12 Aug 2016 00:24:22 -0800
Subject: [PATCH] Handle zero projects more gracefully.

---
 .../beust/kobalt/internal/BuildListeners.kt   |  6 +++-
 .../com/beust/kobalt/internal/DynamicGraph.kt | 34 ++++++++++---------
 2 files changed, 23 insertions(+), 17 deletions(-)

diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/BuildListeners.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/BuildListeners.kt
index 23042dff..1a8781a5 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/BuildListeners.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/BuildListeners.kt
@@ -59,7 +59,6 @@ class BuildListeners : IBuildListener, IBuildReportContributor {
         fun formatMillisLeft(millis: Long, length: Int) = formatMillis(millis, "%1\$-$length.2f")
 
         fun millisToSeconds(millis: Long) = (millis.toDouble() / 1000).toInt()
-        val buildTime = millisToSeconds(System.currentTimeMillis() - buildStartTime!!)
 
         val profiling = args.profiling
         if (profiling) {
@@ -94,6 +93,11 @@ class BuildListeners : IBuildListener, IBuildReportContributor {
 //        }
         }
 
+        val buildTime =
+            if (buildStartTime != null)
+                millisToSeconds(System.currentTimeMillis() - buildStartTime!!)
+            else
+                0
         // BUILD SUCCESSFUL / FAILED message
         val message =
             if (hasFailures) {
diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/DynamicGraph.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/DynamicGraph.kt
index c618472c..81a50616 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/DynamicGraph.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/DynamicGraph.kt
@@ -339,26 +339,28 @@ class DynamicGraphExecutor<T>(val graph : DynamicGraph<T>, val factory: IThreadW
         }
 
         fun displayRegularLog(table: AsciiTable.Builder) : AsciiTable.Builder {
-            val start = historyLog[0].timestamp
-            val projectStart = ConcurrentHashMap<String, Long>()
-            historyLog.forEach { line ->
-                val row = arrayListOf<String>()
-                row.add(toSeconds(line.timestamp - start))
-                threadIds.keys.forEach {
-                    if (line.threadId == it) {
-                        var duration = ""
-                        if (line.start) {
-                            projectStart[line.name] = line.timestamp
+            if (historyLog.any()) {
+                val start = historyLog[0].timestamp
+                val projectStart = ConcurrentHashMap<String, Long>()
+                historyLog.forEach { line ->
+                    val row = arrayListOf<String>()
+                    row.add(toSeconds(line.timestamp - start))
+                    threadIds.keys.forEach {
+                        if (line.threadId == it) {
+                            var duration = ""
+                            if (line.start) {
+                                projectStart[line.name] = line.timestamp
+                            } else {
+                                duration = " (" + ((line.timestamp - projectStart[line.name]!!) / 1000)
+                                        .toInt().toString() + ")"
+                            }
+                            row.add((line.name + duration))
                         } else {
-                            duration = " (" + ((line.timestamp - projectStart[line.name]!!) / 1000)
-                                    .toInt().toString() + ")"
+                            row.add("")
                         }
-                        row.add((line.name + duration))
-                    } else {
-                        row.add("")
                     }
+                    table.addRow(row)
                 }
-                table.addRow(row)
             }
             return table
         }