[PATCH 0/1] diffcore-blobfind

[Stefan Beller <sbeller@xxxxxxxxxx>]

This includes the suggestions by Junio,

Thanks,
Stefan

interdiff to currently queued below.

Stefan Beller (1):
  diffcore: add a filter to find a specific blob

 Documentation/diff-options.txt |  5 +++++
 Makefile                       |  1 +
 builtin/log.c                  |  2 +-
 diff.c                         | 20 +++++++++++++++++++-
 diff.h                         |  3 +++
 diffcore-blobfind.c            | 41 +++++++++++++++++++++++++++++++++++++++++
 diffcore.h                     |  1 +
 revision.c                     |  5 ++++-
 t/t4064-diff-blobfind.sh       | 35 +++++++++++++++++++++++++++++++++++
 9 files changed, 110 insertions(+), 3 deletions(-)
 create mode 100644 diffcore-blobfind.c
 create mode 100755 t/t4064-diff-blobfind.sh

-- 
2.15.1.424.g9478a66081-goog

diff --git c/Documentation/diff-options.txt w/Documentation/diff-options.txt
index 252a21cc19..34d53b95f1 100644
--- c/Documentation/diff-options.txt
+++ w/Documentation/diff-options.txt
@@ -500,6 +500,7 @@ information.
 --pickaxe-regex::
 	Treat the <string> given to `-S` as an extended POSIX regular
 	expression to match.
+
 --blobfind=<blob-id>::
 	Restrict the output such that one side of the diff
 	matches the given blob-id.
diff --git c/diffcore-blobfind.c w/diffcore-blobfind.c
index 5d222fc336..e65c7cad6e 100644
--- c/diffcore-blobfind.c
+++ w/diffcore-blobfind.c
@@ -8,40 +8,30 @@
 static void diffcore_filter_blobs(struct diff_queue_struct *q,
 				  struct diff_options *options)
 {
-	int i, j = 0, c = q->nr;
+	int src, dst;
 
 	if (!options->blobfind)
 		BUG("blobfind oidset not initialized???");
 
-	for (i = 0; i < q->nr; i++) {
-		struct diff_filepair *p = q->queue[i];
+	for (src = dst = 0; src < q->nr; src++) {
+		struct diff_filepair *p = q->queue[src];
 
-		if (DIFF_PAIR_UNMERGED(p) ||
-		    (DIFF_FILE_VALID(p->one) &&
+		if ((DIFF_FILE_VALID(p->one) &&
 		     oidset_contains(options->blobfind, &p->one->oid)) ||
 		    (DIFF_FILE_VALID(p->two) &&
-		     oidset_contains(options->blobfind, &p->two->oid)))
-			continue;
-
-		diff_free_filepair(p);
-		q->queue[i] = NULL;
-		c--;
-	}
-
-	/* Keep it sorted. */
-	i = 0; j = 0;
-	while (i < c) {
-		while (!q->queue[j])
-			j++;
-		q->queue[i] = q->queue[j];
-		i++; j++;
+		     oidset_contains(options->blobfind, &p->two->oid))) {
+			q->queue[dst] = p;
+			dst++;
+		} else {
+			diff_free_filepair(p);
+		}
 	}
 
-	q->nr = c;
-
-	if (!c) {
+	if (!dst) {
 		free(q->queue);
 		DIFF_QUEUE_CLEAR(q);
+	} else {
+		q->nr = dst;
 	}
 }
 
diff --git c/revision.c w/revision.c
index 6449619c0a..8e1a89f832 100644
--- c/revision.c
+++ w/revision.c
@@ -2884,6 +2884,8 @@ int prepare_revision_walk(struct rev_info *revs)
 		simplify_merges(revs);
 	if (revs->children.name)
 		set_children(revs);
+	if (revs->diffopt.blobfind)
+		revs->simplify_history = 0;
 	return 0;
 }