From a402ac62e1fbf150d9e4554812f9abd2d8d6fd86 Mon Sep 17 00:00:00 2001
From: Jason Haslam <jason@scitools.com>
Date: Mon, 8 Jun 2015 10:11:18 -0600
Subject: [PATCH] blame: add blame progress callback

---
 include/git2/blame.h | 16 ++++++++++++++++
 src/blame_git.c      |  8 ++++++++
 2 files changed, 24 insertions(+)

diff --git a/include/git2/blame.h b/include/git2/blame.h
index f42c8155289..f4faa160c45 100644
--- a/include/git2/blame.h
+++ b/include/git2/blame.h
@@ -51,6 +51,19 @@ typedef enum {
 	GIT_BLAME_IGNORE_WHITESPACE = (1<<6),
 } git_blame_flag_t;
 
+/**
+ * Blame progress callback.
+ *
+ * Called for each blame suspect.
+ *
+ * - 'suspect' is the id of the suspect commit.
+ *
+ * Returning a non-zero value will abort the blame.
+ */
+typedef int (*git_blame_progress_cb)(
+	const git_oid *suspect,
+	void *payload);
+
 /**
  * Blame options structure
  *
@@ -87,6 +100,9 @@ typedef struct git_blame_options {
 	 * The default is the last line of the file.
 	 */
 	size_t max_line;
+
+	git_blame_progress_cb progress_cb;
+	void                 *payload;
 } git_blame_options;
 
 #define GIT_BLAME_OPTIONS_VERSION 1
diff --git a/src/blame_git.c b/src/blame_git.c
index 073137a68a1..e2928fd7951 100644
--- a/src/blame_git.c
+++ b/src/blame_git.c
@@ -653,6 +653,14 @@ int git_blame__like_git(git_blame *blame, uint32_t opt)
 		if (!suspect)
 			break;
 
+		/* Report progress. */
+		if (blame->options.progress_cb) {
+			int error;
+			const git_oid *id = git_commit_id(suspect->commit);
+			if ((error = blame->options.progress_cb(id, blame->options.payload)))
+				return error;
+		}
+
 		/* We'll use this suspect later in the loop, so hold on to it for now. */
 		origin_incref(suspect);