From 4a504db69577bd00644850915a6c5063bf29c989 Mon Sep 17 00:00:00 2001
From: jgindin <jay.gindin+github@gmail.com>
Date: Thu, 1 Nov 2012 01:19:21 -0700
Subject: [PATCH] In mercurial, a changeset *can* have no parents...that means
 its a root.

---
 .../provider/HgCachingCommitedChangesProvider.java   | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/plugins/hg4idea/src/org/zmlx/hg4idea/provider/HgCachingCommitedChangesProvider.java b/plugins/hg4idea/src/org/zmlx/hg4idea/provider/HgCachingCommitedChangesProvider.java
index 8b4f7bce89f8..c59d5fcebc08 100644
--- a/plugins/hg4idea/src/org/zmlx/hg4idea/provider/HgCachingCommitedChangesProvider.java
+++ b/plugins/hg4idea/src/org/zmlx/hg4idea/provider/HgCachingCommitedChangesProvider.java
@@ -205,7 +205,17 @@ public class HgCachingCommitedChangesProvider implements CachingCommittedChanges
 
     for (HgFileRevision revision : localRevisions) {
       HgRevisionNumber vcsRevisionNumber = revision.getRevisionNumber();
-      HgRevisionNumber firstParent = vcsRevisionNumber.getParents().get(0);
+      List<HgRevisionNumber> parents = vcsRevisionNumber.getParents();
+
+      HgRevisionNumber firstParent;
+      if ( parents.isEmpty() ) {
+        // There's no parent...this is a root in the repository.
+        firstParent = null;
+      }
+      else {
+        firstParent = parents.get(0);
+      }
+
       List<Change> changes = new ArrayList<Change>();
       for (String file : revision.getModifiedFiles()) {
         changes.add(createChange(root, file, firstParent, file, vcsRevisionNumber, FileStatus.MODIFIED));