1 files changed, 51 insertions, 8 deletions

diff --git a/include/git2/commit.h b/include/git2/commit.h
index a08cf1c6c..fb53a701b 100644
--- a/include/git2/commit.h
+++ b/include/git2/commit.h
@@ -117,6 +117,17 @@ GIT_EXTERN(const char *) git_commit_message(const git_commit *commit);
 GIT_EXTERN(const char *) git_commit_message_raw(const git_commit *commit);
 
 /**
+ * Get the short "summary" of the git commit message.
+ *
+ * The returned message is the summary of the commit, comprising the
+ * first paragraph of the message with whitespace trimmed and squashed.
+ *
+ * @param commit a previously loaded commit.
+ * @return the summary of a commit or NULL on error
+ */
+GIT_EXTERN(const char *) git_commit_summary(git_commit *commit);
+
+/**
  * Get the commit time (i.e. committer time) of a commit.
  *
  * @param commit a previously loaded commit.
@@ -231,8 +242,8 @@ GIT_EXTERN(int) git_commit_nth_gen_ancestor(
 /**
  * Create new commit in the repository from a list of `git_object` pointers
  *
- * The message will not be cleaned up automatically. You can do that with
- * the `git_message_prettify()` function.
+ * The message will **not** be cleaned up automatically. You can do that
+ * with the `git_message_prettify()` function.
  *
  * @param id Pointer in which to store the OID of the newly created commit
  *
@@ -243,7 +254,8 @@ GIT_EXTERN(int) git_commit_nth_gen_ancestor(
  *	is not direct, it will be resolved to a direct reference.
  *	Use "HEAD" to update the HEAD of the current branch and
  *	make it point to this commit. If the reference doesn't
- *	exist yet, it will be created.
+ *	exist yet, it will be created. If it does exist, the first
+ *	parent must be the tip of this branch.
  *
  * @param author Signature with author and author time of commit
  *
@@ -280,20 +292,20 @@ GIT_EXTERN(int) git_commit_create(
 	const char *message_encoding,
 	const char *message,
 	const git_tree *tree,
-	int parent_count,
+	size_t parent_count,
 	const git_commit *parents[]);
 
 /**
  * Create new commit in the repository using a variable argument list.
  *
- * The message will be cleaned up from excess whitespace and it will be made
- * sure that the last line ends with a '\n'.
+ * The message will **not** be cleaned up automatically. You can do that
+ * with the `git_message_prettify()` function.
  *
  * The parents for the commit are specified as a variable list of pointers
  * to `const git_commit *`. Note that this is a convenience method which may
  * not be safe to export for certain languages or compilers
  *
- * All other parameters remain the same at `git_commit_create()`.
+ * All other parameters remain the same as `git_commit_create()`.
  *
  * @see git_commit_create
  */
@@ -306,9 +318,40 @@ GIT_EXTERN(int) git_commit_create_v(
 	const char *message_encoding,
 	const char *message,
 	const git_tree *tree,
-	int parent_count,
+	size_t parent_count,
 	...);
 
+/**
+ * Amend an existing commit by replacing only non-NULL values.
+ *
+ * This creates a new commit that is exactly the same as the old commit,
+ * except that any non-NULL values will be updated.  The new commit has
+ * the same parents as the old commit.
+ *
+ * The `update_ref` value works as in the regular `git_commit_create()`,
+ * updating the ref to point to the newly rewritten commit.  If you want
+ * to amend a commit that is not currently the tip of the branch and then
+ * rewrite the following commits to reach a ref, pass this as NULL and
+ * update the rest of the commit chain and ref separately.
+ *
+ * Unlike `git_commit_create()`, the `author`, `committer`, `message`,
+ * `message_encoding`, and `tree` parameters can be NULL in which case this
+ * will use the values from the original `commit_to_amend`.
+ *
+ * All parameters have the same meanings as in `git_commit_create()`.
+ *
+ * @see git_commit_create
+ */
+GIT_EXTERN(int) git_commit_amend(
+	git_oid *id,
+	const git_commit *commit_to_amend,
+	const char *update_ref,
+	const git_signature *author,
+	const git_signature *committer,
+	const char *message_encoding,
+	const char *message,
+	const git_tree *tree);
+
 /** @} */
 GIT_END_DECL
 #endif