[EGIT PATCH v5 3/7] Do not write to the reflog unless the refupdate logmessage is set

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From: Shawn O. Pearce <spearce@xxxxxxxxxxx>

This permits micro-update steps (or otherwise uninteresting states)
to be skipped in the reflog.

Signed-off-by: Robin Rosenberg <robin.rosenberg@xxxxxxxxxx>
Signed-off-by: Shawn O. Pearce <spearce@xxxxxxxxxxx>
---
 .../tst/org/spearce/jgit/lib/RefUpdateTest.java    |    1 +
 .../src/org/spearce/jgit/lib/RefUpdate.java        |   56 +++++++++++++++----
 2 files changed, 45 insertions(+), 12 deletions(-)

diff --git a/org.spearce.jgit.test/tst/org/spearce/jgit/lib/RefUpdateTest.java b/org.spearce.jgit.test/tst/org/spearce/jgit/lib/RefUpdateTest.java
index 6b1975a..84653c8 100644
--- a/org.spearce.jgit.test/tst/org/spearce/jgit/lib/RefUpdateTest.java
+++ b/org.spearce.jgit.test/tst/org/spearce/jgit/lib/RefUpdateTest.java
@@ -126,6 +126,7 @@ public void testDeleteLooseAndItsDirectory() throws IOException {
 		RefUpdate updateRef = db.updateRef("refs/heads/z/c");
 		updateRef.setNewObjectId(pid);
 		updateRef.setForceUpdate(true);
+		updateRef.setRefLogMessage("new test ref", false);
 		Result update = updateRef.update();
 		assertEquals(Result.NEW, update); // internal
 		assertTrue(new File(db.getDirectory(), Constants.R_HEADS + "z")
diff --git a/org.spearce.jgit/src/org/spearce/jgit/lib/RefUpdate.java b/org.spearce.jgit/src/org/spearce/jgit/lib/RefUpdate.java
index a9ab73b..8044c6e 100644
--- a/org.spearce.jgit/src/org/spearce/jgit/lib/RefUpdate.java
+++ b/org.spearce.jgit/src/org/spearce/jgit/lib/RefUpdate.java
@@ -165,6 +165,7 @@ RefUpdate(final RefDatabase r, final Ref ref, final File f) {
 		this.ref = ref;
 		oldValue = ref.getObjectId();
 		looseFile = f;
+		refLogMessage = "";
 	}
 
 	/** @return the repository the updated ref resides in */
@@ -264,7 +265,8 @@ public void setRefLogIdent(final PersonIdent pi) {
 	/**
 	 * Get the message to include in the reflog.
 	 * 
-	 * @return message the caller wants to include in the reflog.
+	 * @return message the caller wants to include in the reflog; null if the
+	 *         update should not be logged.
 	 */
 	public String getRefLogMessage() {
 		return refLogMessage;
@@ -274,15 +276,29 @@ public String getRefLogMessage() {
 	 * Set the message to include in the reflog.
 	 * 
 	 * @param msg
-	 *            the message to describe this change.
+	 *            the message to describe this change. It may be null
+	 *            if appendStatus is null in order not to append to the reflog
 	 * @param appendStatus
 	 *            true if the status of the ref change (fast-forward or
 	 *            forced-update) should be appended to the user supplied
 	 *            message.
 	 */
 	public void setRefLogMessage(final String msg, final boolean appendStatus) {
-		refLogMessage = msg;
-		refLogIncludeResult = appendStatus;
+		if (msg == null && !appendStatus)
+			disableRefLog();
+		else if (msg == null && appendStatus) {
+			refLogMessage = "";
+			refLogIncludeResult = true;
+		} else {
+			refLogMessage = msg;
+			refLogIncludeResult = appendStatus;
+		}
+	}
+
+	/** Don't record this update in the ref's associated reflog. */
+	public void disableRefLog() {
+		refLogMessage = null;
+		refLogIncludeResult = false;
 	}
 
 	/**
@@ -471,21 +487,37 @@ private Result updateStore(final LockFile lock, final Result status)
 		lock.setNeedStatInformation(true);
 		lock.write(newValue);
 		String msg = getRefLogMessage();
-		if (msg != null && refLogIncludeResult) {
-			if (status == Result.FORCED)
-				msg += ": forced-update";
-			else if (status == Result.FAST_FORWARD)
-				msg += ": fast forward";
-			else if (status == Result.NEW)
-				msg += ": created";
+		if (msg != null) {
+			if (refLogIncludeResult) {
+				String strResult = toResultString(status);
+				if (strResult != null) {
+					if (msg.length() > 0)
+						msg = msg + ": " + strResult;
+					else
+						msg = strResult;
+				}
+			}
+			RefLogWriter.append(this, msg);
 		}
-		RefLogWriter.append(this, msg);
 		if (!lock.commit())
 			return Result.LOCK_FAILURE;
 		db.stored(this.ref.getOrigName(),  ref.getName(), newValue, lock.getCommitLastModified());
 		return status;
 	}
 
+	private static String toResultString(final Result status) {
+		switch (status) {
+		case FORCED:
+			return "forced-update";
+		case FAST_FORWARD:
+			return "fast forward";
+		case NEW:
+			return "created";
+		default:
+			return null;
+		}
+	}
+
 	/**
 	 * Handle the abstraction of storing a ref update. This is because both
 	 * updating and deleting of a ref have merge testing in common.
-- 
1.6.3.2.199.g7340d

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