Merge pull request #652 from nulltoken/topic/diff-callbacks

diff: provide more context to the consumer of the callbacks

20 files changed, 136 insertions, 96 deletions

diff --git a/include/git2/diff.h b/include/git2/diff.h
index 0c9f620c1..d8dc91c80 100644
--- a/include/git2/diff.h
+++ b/include/git2/diff.h
@@ -154,19 +154,22 @@ typedef int (*git_diff_hunk_fn)(
  * Line origin constants.
  *
  * These values describe where a line came from and will be passed to
- * the git_diff_line_fn when iterating over a diff.  There are some
+ * the git_diff_data_fn when iterating over a diff.  There are some
  * special origin contants at the end that are used for the text
  * output callbacks to demarcate lines that are actually part of
  * the file or hunk headers.
  */
 enum {
-	/* these values will be sent to `git_diff_line_fn` along with the line */
+	/* these values will be sent to `git_diff_data_fn` along with the line */
 	GIT_DIFF_LINE_CONTEXT   = ' ',
 	GIT_DIFF_LINE_ADDITION  = '+',
 	GIT_DIFF_LINE_DELETION  = '-',
 	GIT_DIFF_LINE_ADD_EOFNL = '\n', /**< LF was added at end of file */
 	GIT_DIFF_LINE_DEL_EOFNL = '\0', /**< LF was removed at end of file */
-	/* these values will only be sent to a `git_diff_output_fn` */
+	/* these values will only be sent to a `git_diff_data_fn` when the content
+	 * of a diff is being formatted (eg. through git_diff_print_patch() or
+	 * git_diff_print_compact(), for instance).
+	 */
 	GIT_DIFF_LINE_FILE_HDR  = 'F',
 	GIT_DIFF_LINE_HUNK_HDR  = 'H',
 	GIT_DIFF_LINE_BINARY    = 'B'
@@ -174,25 +177,19 @@ enum {
 
 /**
  * When iterating over a diff, callback that will be made per text diff
- * line.
- */
-typedef int (*git_diff_line_fn)(
-	void *cb_data,
-	git_diff_delta *delta,
-	char line_origin, /**< GIT_DIFF_LINE_... value from above */
-	const char *content,
-	size_t content_len);
-
-/**
+ * line. In this context, the provided range will be NULL.
+ *
  * When printing a diff, callback that will be made to output each line
  * of text.  This uses some extra GIT_DIFF_LINE_... constants for output
  * of lines of file and hunk headers.
  */
-typedef int (*git_diff_output_fn)(
+typedef int (*git_diff_data_fn)(
 	void *cb_data,
+	git_diff_delta *delta,
+	git_diff_range *range,
 	char line_origin, /**< GIT_DIFF_LINE_... value from above */
-	const char *formatted_output);
-
+	const char *content,
+	size_t content_len);
 
 /** @name Diff List Generator Functions
  *
@@ -311,7 +308,7 @@ GIT_EXTERN(int) git_diff_foreach(
 	void *cb_data,
 	git_diff_file_fn file_cb,
 	git_diff_hunk_fn hunk_cb,
-	git_diff_line_fn line_cb);
+	git_diff_data_fn line_cb);
 
 /**
  * Iterate over a diff generating text output like "git diff --name-status".
@@ -319,7 +316,7 @@ GIT_EXTERN(int) git_diff_foreach(
 GIT_EXTERN(int) git_diff_print_compact(
 	git_diff_list *diff,
 	void *cb_data,
-	git_diff_output_fn print_cb);
+	git_diff_data_fn print_cb);
 
 /**
  * Iterate over a diff generating text output like "git diff".
@@ -329,7 +326,7 @@ GIT_EXTERN(int) git_diff_print_compact(
 GIT_EXTERN(int) git_diff_print_patch(
 	git_diff_list *diff,
 	void *cb_data,
-	git_diff_output_fn print_cb);
+	git_diff_data_fn print_cb);
 
 /**@}*/
 
@@ -348,7 +345,7 @@ GIT_EXTERN(int) git_diff_blobs(
 	git_diff_options *options,
 	void *cb_data,
 	git_diff_hunk_fn hunk_cb,
-	git_diff_line_fn line_cb);
+	git_diff_data_fn line_cb);
 
 GIT_END_DECL
 
diff --git a/src/buffer.h b/src/buffer.h
index 294ff6961..1cf588a62 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -93,11 +93,16 @@ GIT_INLINE(int) git_buf_joinpath(git_buf *buf, const char *a, const char *b)
 	return git_buf_join(buf, '/', a, b);
 }
 
-GIT_INLINE(const char *) git_buf_cstr(git_buf *buf)
+GIT_INLINE(const char *) git_buf_cstr(const git_buf *buf)
 {
 	return buf->ptr;
 }
 
+GIT_INLINE(size_t) git_buf_len(const git_buf *buf)
+{
+	return buf->size;
+}
+
 void git_buf_copy_cstr(char *data, size_t datasize, const git_buf *buf);
 
 #define git_buf_PUTS(buf, str) git_buf_put(buf, str, sizeof(str) - 1)
diff --git a/src/config_file.c b/src/config_file.c
index 7841ea00f..be0977475 100644
--- a/src/config_file.c
+++ b/src/config_file.c
@@ -1233,7 +1233,7 @@ static int parse_multiline_variable(diskfile_backend *cfg, git_buf *value, int i
 	 * standard, this character **has** to be last one in the buf, with
 	 * no whitespace after it */
 	assert(is_multiline_var(value->ptr));
-	git_buf_truncate(value, value->size - 1);
+	git_buf_truncate(value, git_buf_len(value) - 1);
 
 	proc_line = fixup_line(line, in_quotes);
 	if (proc_line == NULL) {
diff --git a/src/crlf.c b/src/crlf.c
index 536b50f1e..8fe588a35 100644
--- a/src/crlf.c
+++ b/src/crlf.c
@@ -105,7 +105,7 @@ static int crlf_load_attributes(struct crlf_attrs *ca, git_repository *repo, con
 static int drop_crlf(git_buf *dest, const git_buf *source)
 {
 	const char *scan = source->ptr, *next;
-	const char *scan_end = source->ptr + source->size;
+	const char *scan_end = git_buf_cstr(source) + git_buf_len(source);
 
 	/* Main scan loop.  Find the next carriage return and copy the
 	 * whole chunk up to that point to the destination buffer.
@@ -138,7 +138,7 @@ static int crlf_apply_to_odb(git_filter *self, git_buf *dest, const git_buf *sou
 	assert(self && dest && source);
 
 	/* Empty file? Nothing to do */
-	if (source->size == 0)
+	if (git_buf_len(source) == 0)
 		return 0;
 
 	/* Heuristics to see if we can skip the conversion.
diff --git a/src/diff_output.c b/src/diff_output.c
index 7c5b6f276..a5a11395f 100644
--- a/src/diff_output.c
+++ b/src/diff_output.c
@@ -18,9 +18,10 @@ typedef struct {
 	git_diff_list *diff;
 	void *cb_data;
 	git_diff_hunk_fn hunk_cb;
-	git_diff_line_fn line_cb;
+	git_diff_data_fn line_cb;
 	unsigned int index;
 	git_diff_delta *delta;
+	git_diff_range range;
 } diff_output_info;
 
 static int read_next_int(const char **str, int *value)
@@ -62,6 +63,8 @@ static int diff_output_cb(void *priv, mmbuffer_t *bufs, int len)
 		if (range.old_start < 0 || range.new_start < 0)
 			return -1;
 
+		memcpy(&info->range, &range, sizeof(git_diff_range));
+
 		return info->hunk_cb(
 			info->cb_data, info->delta, &range, bufs[0].ptr, bufs[0].size);
 	}
@@ -76,7 +79,7 @@ static int diff_output_cb(void *priv, mmbuffer_t *bufs, int len)
 			GIT_DIFF_LINE_CONTEXT;
 
 		if (info->line_cb(
-			info->cb_data, info->delta, origin, bufs[1].ptr, bufs[1].size) < 0)
+			info->cb_data, info->delta, &info->range, origin, bufs[1].ptr, bufs[1].size) < 0)
 			return -1;
 
 		/* deal with adding and removing newline at EOF */
@@ -87,7 +90,7 @@ static int diff_output_cb(void *priv, mmbuffer_t *bufs, int len)
 				origin = GIT_DIFF_LINE_DEL_EOFNL;
 
 			return info->line_cb(
-				info->cb_data, info->delta, origin, bufs[2].ptr, bufs[2].size);
+				info->cb_data, info->delta, &info->range, origin, bufs[2].ptr, bufs[2].size);
 		}
 	}
 
@@ -291,7 +294,7 @@ int git_diff_foreach(
 	void *data,
 	git_diff_file_fn file_cb,
 	git_diff_hunk_fn hunk_cb,
-	git_diff_line_fn line_cb)
+	git_diff_data_fn line_cb)
 {
 	int error = 0;
 	diff_output_info info;
@@ -433,7 +436,7 @@ cleanup:
 
 typedef struct {
 	git_diff_list *diff;
-	git_diff_output_fn print_cb;
+	git_diff_data_fn print_cb;
 	void *cb_data;
 	git_buf *buf;
 } diff_print_info;
@@ -491,13 +494,13 @@ static int print_compact(void *data, git_diff_delta *delta, float progress)
 	if (git_buf_oom(pi->buf))
 		return -1;
 
-	return pi->print_cb(pi->cb_data, GIT_DIFF_LINE_FILE_HDR, pi->buf->ptr);
+	return pi->print_cb(pi->cb_data, delta, NULL, GIT_DIFF_LINE_FILE_HDR, git_buf_cstr(pi->buf), git_buf_len(pi->buf));
 }
 
 int git_diff_print_compact(
 	git_diff_list *diff,
 	void *cb_data,
-	git_diff_output_fn print_cb)
+	git_diff_data_fn print_cb)
 {
 	int error;
 	git_buf buf = GIT_BUF_INIT;
@@ -586,7 +589,7 @@ static int print_patch_file(void *data, git_diff_delta *delta, float progress)
 	if (git_buf_oom(pi->buf))
 		return -1;
 
-    result = pi->print_cb(pi->cb_data, GIT_DIFF_LINE_FILE_HDR, pi->buf->ptr);
+    result = pi->print_cb(pi->cb_data, delta, NULL, GIT_DIFF_LINE_FILE_HDR, git_buf_cstr(pi->buf), git_buf_len(pi->buf));
     if (result < 0)
         return result;
 
@@ -600,7 +603,7 @@ static int print_patch_file(void *data, git_diff_delta *delta, float progress)
 	if (git_buf_oom(pi->buf))
 		return -1;
 
-	return pi->print_cb(pi->cb_data, GIT_DIFF_LINE_BINARY, pi->buf->ptr);
+	return pi->print_cb(pi->cb_data, delta, NULL, GIT_DIFF_LINE_BINARY, git_buf_cstr(pi->buf), git_buf_len(pi->buf));
 }
 
 static int print_patch_hunk(
@@ -612,27 +615,23 @@ static int print_patch_hunk(
 {
 	diff_print_info *pi = data;
 
-	GIT_UNUSED(d);
-	GIT_UNUSED(r);
-
 	git_buf_clear(pi->buf);
 	if (git_buf_printf(pi->buf, "%.*s", (int)header_len, header) < 0)
 		return -1;
 
-	return pi->print_cb(pi->cb_data, GIT_DIFF_LINE_HUNK_HDR, pi->buf->ptr);
+	return pi->print_cb(pi->cb_data, d, r, GIT_DIFF_LINE_HUNK_HDR, git_buf_cstr(pi->buf), git_buf_len(pi->buf));
 }
 
 static int print_patch_line(
 	void *data,
 	git_diff_delta *delta,
+	git_diff_range *range,
 	char line_origin, /* GIT_DIFF_LINE value from above */
 	const char *content,
 	size_t content_len)
 {
 	diff_print_info *pi = data;
 
-	GIT_UNUSED(delta);
-
 	git_buf_clear(pi->buf);
 
 	if (line_origin == GIT_DIFF_LINE_ADDITION ||
@@ -645,13 +644,13 @@ static int print_patch_line(
 	if (git_buf_oom(pi->buf))
 		return -1;
 
-	return pi->print_cb(pi->cb_data, line_origin, pi->buf->ptr);
+	return pi->print_cb(pi->cb_data, delta, range, line_origin, git_buf_cstr(pi->buf), git_buf_len(pi->buf));
 }
 
 int git_diff_print_patch(
 	git_diff_list *diff,
 	void *cb_data,
-	git_diff_output_fn print_cb)
+	git_diff_data_fn print_cb)
 {
 	int error;
 	git_buf buf = GIT_BUF_INIT;
@@ -678,7 +677,7 @@ int git_diff_blobs(
 	git_diff_options *options,
 	void *cb_data,
 	git_diff_hunk_fn hunk_cb,
-	git_diff_line_fn line_cb)
+	git_diff_data_fn line_cb)
 {
 	diff_output_info info;
 	git_diff_delta delta;
diff --git a/src/filter.c b/src/filter.c
index d2d113409..3389bed69 100644
--- a/src/filter.c
+++ b/src/filter.c
@@ -19,13 +19,13 @@ void git_text_gather_stats(git_text_stats *stats, const git_buf *text)
 
 	memset(stats, 0, sizeof(*stats));
 
-	for (i = 0; i < text->size; i++) {
+	for (i = 0; i < git_buf_len(text); i++) {
 		unsigned char c = text->ptr[i];
 
 		if (c == '\r') {
 			stats->cr++;
 
-			if (i + 1 < text->size && text->ptr[i + 1] == '\n')
+			if (i + 1 < git_buf_len(text) && text->ptr[i + 1] == '\n')
 				stats->crlf++;
 		}
 
@@ -59,7 +59,7 @@ void git_text_gather_stats(git_text_stats *stats, const git_buf *text)
 	}
 
 	/* If file ends with EOF then don't count this EOF as non-printable. */
-	if (text->size >= 1 && text->ptr[text->size - 1] == '\032')
+	if (git_buf_len(text) >= 1 && text->ptr[text->size - 1] == '\032')
 		stats->nonprintable--;
 }
 
@@ -127,14 +127,14 @@ int git_filters_apply(git_buf *dest, git_buf *source, git_vector *filters)
 
 	src = 0;
 
-	if (source->size == 0) {
+	if (git_buf_len(source) == 0) {
 		git_buf_clear(dest);
 		return GIT_SUCCESS;
 	}
 
 	/* Pre-grow the destination buffer to more or less the size
 	 * we expect it to have */
-	if (git_buf_grow(dest, source->size) < 0)
+	if (git_buf_grow(dest, git_buf_len(source)) < 0)
 		return GIT_ENOMEM;
 
 	for (i = 0; i < filters->length; ++i) {
diff --git a/src/indexer.c b/src/indexer.c
index 22a510a3a..d2e492c39 100644
--- a/src/indexer.c
+++ b/src/indexer.c
@@ -401,7 +401,7 @@ static int index_path_stream(git_buf *path, git_indexer_stream *idx, const char
 
 	git_buf_truncate(path, slash);
 	git_buf_puts(path, prefix);
-	git_oid_fmt(path->ptr + path->size, &idx->hash);
+	git_oid_fmt(path->ptr + git_buf_len(path), &idx->hash);
 	path->size += GIT_OID_HEXSZ;
 	git_buf_puts(path, suffix);
 
@@ -633,7 +633,7 @@ static int index_path(git_buf *path, git_indexer *idx)
 
 	git_buf_truncate(path, slash);
 	git_buf_puts(path, prefix);
-	git_oid_fmt(path->ptr + path->size, &idx->hash);
+	git_oid_fmt(path->ptr + git_buf_len(path), &idx->hash);
 	path->size += GIT_OID_HEXSZ;
 	git_buf_puts(path, suffix);
 
diff --git a/src/odb_loose.c b/src/odb_loose.c
index b593d1846..d028deca5 100644
--- a/src/odb_loose.c
+++ b/src/odb_loose.c
@@ -61,13 +61,13 @@ static int object_file_name(git_buf *name, const char *dir, const git_oid *id)
 	git_buf_sets(name, dir);
 
 	/* expand length for 40 hex sha1 chars + 2 * '/' + '\0' */
-	if (git_buf_grow(name, name->size + GIT_OID_HEXSZ + 3) < 0)
+	if (git_buf_grow(name, git_buf_len(name) + GIT_OID_HEXSZ + 3) < 0)
 		return -1;
 
 	git_path_to_dir(name);
 
 	/* loose object filename: aa/aaa... (41 bytes) */
-	git_oid_pathfmt(name->ptr + name->size, id);
+	git_oid_pathfmt(name->ptr + git_buf_len(name), id);
 	name->size += GIT_OID_HEXSZ + 1;
 	name->ptr[name->size] = '\0';
 
@@ -81,7 +81,7 @@ static size_t get_binary_object_header(obj_hdr *hdr, git_buf *obj)
 	unsigned char *data = (unsigned char *)obj->ptr;
 	size_t shift, size, used = 0;
 
-	if (obj->size == 0)
+	if (git_buf_len(obj) == 0)
 		return 0;
 
 	c = data[used++];
@@ -90,7 +90,7 @@ static size_t get_binary_object_header(obj_hdr *hdr, git_buf *obj)
 	size = c & 15;
 	shift = 4;
 	while (c & 0x80) {
-		if (obj->size <= used)
+		if (git_buf_len(obj) <= used)
 			return 0;
 		if (sizeof(size_t) * 8 <= shift)
 			return 0;
@@ -182,7 +182,7 @@ static int start_inflate(z_stream *s, git_buf *obj, void *out, size_t len)
 	int status;
 
 	init_stream(s, out, len);
-	set_stream_input(s, obj->ptr, obj->size);
+	set_stream_input(s, obj->ptr, git_buf_len(obj));
 
 	if ((status = inflateInit(s)) < Z_OK)
 		return status;
@@ -469,7 +469,7 @@ static int locate_object(
 static int fn_locate_object_short_oid(void *state, git_buf *pathbuf) {
 	loose_locate_object_state *sstate = (loose_locate_object_state *)state;
 
-	if (pathbuf->size - sstate->dir_len != GIT_OID_HEXSZ - 2) {
+	if (git_buf_len(pathbuf) - sstate->dir_len != GIT_OID_HEXSZ - 2) {
 		/* Entry cannot be an object. Continue to next entry */
 		return 0;
 	}
@@ -517,7 +517,7 @@ static int locate_object_short_oid(
 	git_path_to_dir(object_location);
 
 	/* save adjusted position at end of dir so it can be restored later */
-	dir_len = object_location->size;
+	dir_len = git_buf_len(object_location);
 
 	/* Convert raw oid to hex formatted oid */
 	git_oid_fmt((char *)state.short_oid, short_oid);
@@ -530,7 +530,7 @@ static int locate_object_short_oid(
 	if (git_path_isdir(object_location->ptr) == false)
 		return git_odb__error_notfound("failed to locate from short oid");
 
-	state.dir_len = object_location->size;
+	state.dir_len = git_buf_len(object_location);
 	state.short_oid_len = len;
 	state.found = 0;
 
diff --git a/src/odb_pack.c b/src/odb_pack.c
index b91e3cadb..242200b4a 100644
--- a/src/odb_pack.c
+++ b/src/odb_pack.c
@@ -219,7 +219,7 @@ static int packfile_load__cb(void *_data, git_buf *path)
 
 	for (i = 0; i < backend->packs.length; ++i) {
 		struct git_pack_file *p = git_vector_get(&backend->packs, i);
-		if (memcmp(p->pack_name, path->ptr, path->size - strlen(".idx")) == 0)
+		if (memcmp(p->pack_name, git_buf_cstr(path), git_buf_len(path) - strlen(".idx")) == 0)
 			return 0;
 	}
 
diff --git a/src/path.c b/src/path.c
index a7cf4402f..f562b0b9e 100644
--- a/src/path.c
+++ b/src/path.c
@@ -221,8 +221,8 @@ int git_path_prettify_dir(git_buf *path_out, const char *path, const char *base)
 int git_path_to_dir(git_buf *path)
 {
 	if (path->asize > 0 &&
-		path->size > 0 &&
-		path->ptr[path->size - 1] != '/')
+		git_buf_len(path) > 0 &&
+		path->ptr[git_buf_len(path) - 1] != '/')
 		git_buf_putc(path, '/');
 
 	return git_buf_oom(path) ? -1 : 0;
@@ -327,12 +327,12 @@ int git_path_walk_up(
 		if (git__prefixcmp(path->ptr, ceiling) == 0)
 			stop = (ssize_t)strlen(ceiling);
 		else
-			stop = path->size;
+			stop = git_buf_len(path);
 	}
-	scan = path->size;
+	scan = git_buf_len(path);
 
 	iter.ptr = path->ptr;
-	iter.size = path->size;
+	iter.size = git_buf_len(path);
 	iter.asize = path->asize;
 
 	while (scan >= stop) {
@@ -407,7 +407,7 @@ static bool _check_dir_contents(
 	bool (*predicate)(const char *))
 {
 	bool result;
-	size_t dir_size = dir->size;
+	size_t dir_size = git_buf_len(dir);
 	size_t sub_size = strlen(sub);
 
 	/* leave base valid even if we could not make space for subdir */
@@ -503,7 +503,7 @@ int git_path_direach(
 	if (git_path_to_dir(path) < 0)
 		return -1;
 
-	wd_len = path->size;
+	wd_len = git_buf_len(path);
 
 	if ((dir = opendir(path->ptr)) == NULL) {
 		giterr_set(GITERR_OS, "Failed to open directory '%s'", path->ptr);
diff --git a/src/pkt.c b/src/pkt.c
index ae7a40860..6cf4dac8e 100644
--- a/src/pkt.c
+++ b/src/pkt.c
@@ -277,7 +277,7 @@ static int buffer_want_with_caps(git_remote_head *head, git_transport_caps *caps
 	len = (unsigned int)
 		(strlen("XXXXwant ") + GIT_OID_HEXSZ + 1 /* NUL */ +
 		 strlen(capstr) + 1 /* LF */);
-	git_buf_grow(buf, buf->size + len);
+	git_buf_grow(buf, git_buf_len(buf) + len);
 
 	git_oid_fmt(oid, &head->oid);
 	return git_buf_printf(buf, "%04xwant %s%c%s\n", len, oid, 0, capstr);
diff --git a/src/protocol.c b/src/protocol.c
index 4c4a7f79b..a7df961a9 100644
--- a/src/protocol.c
+++ b/src/protocol.c
@@ -17,7 +17,7 @@ int git_protocol_store_refs(git_protocol *p, const char *data, size_t len)
 	const char *line_end, *ptr;
 
 	if (len == 0) { /* EOF */
-		if (buf->size != 0) {
+		if (git_buf_len(buf) != 0) {
 			giterr_set(GITERR_NET, "Unexpected EOF");
 			return p->error = -1;
 		} else {
@@ -30,10 +30,10 @@ int git_protocol_store_refs(git_protocol *p, const char *data, size_t len)
 	while (1) {
 		git_pkt *pkt;
 
-		if (buf->size == 0)
+		if (git_buf_len(buf) == 0)
 			return 0;
 
-		error = git_pkt_parse_line(&pkt, ptr, &line_end, buf->size);
+		error = git_pkt_parse_line(&pkt, ptr, &line_end, git_buf_len(buf));
 		if (error == GIT_ESHORTBUFFER)
 			return 0; /* Ask for more */
 		if (error < 0)
diff --git a/src/refs.c b/src/refs.c
index 659ac94b8..28e8f786b 100644
--- a/src/refs.c
+++ b/src/refs.c
@@ -139,7 +139,7 @@ static int loose_parse_symbolic(git_reference *ref, git_buf *file_content)
 
 	refname_start = (const char *)file_content->ptr;
 
-	if (file_content->size < header_len + 1)
+	if (git_buf_len(file_content) < header_len + 1)
 		goto corrupt;
 
 	/*
@@ -174,7 +174,7 @@ static int loose_parse_oid(git_oid *oid, git_buf *file_content)
 	buffer = (char *)file_content->ptr;
 
 	/* File format: 40 chars (OID) + newline */
-	if (file_content->size < GIT_OID_HEXSZ + 1)
+	if (git_buf_len(file_content) < GIT_OID_HEXSZ + 1)
 		goto corrupt;
 
 	if (git_oid_fromstr(oid, buffer) < 0)
diff --git a/src/refspec.c b/src/refspec.c
index d51fd4ceb..7a5127c33 100644
--- a/src/refspec.c
+++ b/src/refspec.c
@@ -103,10 +103,10 @@ int git_refspec_transform_r(git_buf *out, const git_refspec *spec, const char *n
 	 * No '*' at the end means that it's mapped to one specific local
 	 * branch, so no actual transformation is needed.
 	 */
-	if (out->size > 0 && out->ptr[out->size - 1] != '*')
+	if (git_buf_len(out) > 0 && out->ptr[git_buf_len(out) - 1] != '*')
 		return GIT_SUCCESS;
 
-	git_buf_truncate(out, out->size - 1); /* remove trailing '*' */
+	git_buf_truncate(out, git_buf_len(out) - 1); /* remove trailing '*' */
 	git_buf_puts(out, name + strlen(spec->src) - 1);
 
 	if (git_buf_oom(out))
diff --git a/src/repository.c b/src/repository.c
index affc0c4c1..cfabee420 100644
--- a/src/repository.c
+++ b/src/repository.c
@@ -278,7 +278,7 @@ static int find_repo(
 	if ((error = git_buf_joinpath(&path, path.ptr, DOT_GIT)) < 0)
 		return error;
 
-	while (!error && !repo_path->size) {
+	while (!error && !git_buf_len(repo_path)) {
 		if (p_stat(path.ptr, &st) == 0) {
 			/* check that we have not crossed device boundaries */
 			if (initial_device == 0)
@@ -328,7 +328,7 @@ static int find_repo(
 	}
 
 	if (!error && parent_path != NULL) {
-		if (!repo_path->size)
+		if (!git_buf_len(repo_path))
 			git_buf_clear(parent_path);
 		else {
 			git_path_dirname_r(parent_path, path.ptr);
@@ -340,7 +340,7 @@ static int find_repo(
 
 	git_buf_free(&path);
 
-	if (!repo_path->size && !error) {
+	if (!git_buf_len(repo_path) && !error) {
 		giterr_set(GITERR_REPOSITORY,
 			"Could not find repository from '%s'", start_path);
 		error = GIT_ENOTFOUND;
diff --git a/src/transports/http.c b/src/transports/http.c
index 012e8ffbc..938076f90 100644
--- a/src/transports/http.c
+++ b/src/transports/http.c
@@ -321,7 +321,7 @@ static int on_body_parse_response(http_parser *parser, const char *str, size_t l
 	const char *line_end, *ptr;
 
 	if (len == 0) { /* EOF */
-		if (buf->size != 0) {
+		if (git_buf_len(buf) != 0) {
 			giterr_set(GITERR_NET, "Unexpected EOF");
 			return t->error = -1;
 		} else {
@@ -334,10 +334,10 @@ static int on_body_parse_response(http_parser *parser, const char *str, size_t l
 	while (1) {
 		git_pkt *pkt;
 
-		if (buf->size == 0)
+		if (git_buf_len(buf) == 0)
 			return 0;
 
-		error = git_pkt_parse_line(&pkt, ptr, &line_end, buf->size);
+		error = git_pkt_parse_line(&pkt, ptr, &line_end, git_buf_len(buf));
 		if (error == GIT_ESHORTBUFFER) {
 			return 0; /* Ask for more */
 		}
@@ -555,9 +555,9 @@ static int http_download_pack(git_transport *transport, git_repository *repo, gi
 	memset(&settings, 0x0, sizeof(settings));
 	settings.on_message_complete = on_message_complete_download_pack;
 	settings.on_body = on_body_download_pack;
-	*bytes = oldbuf->size;
+	*bytes = git_buf_len(oldbuf);
 
-	if (git_indexer_stream_add(idx, oldbuf->ptr, oldbuf->size, stats) < 0)
+	if (git_indexer_stream_add(idx, git_buf_cstr(oldbuf), git_buf_len(oldbuf), stats) < 0)
 		goto on_error;
 
 	do {
diff --git a/src/tree.c b/src/tree.c
index 56a722960..469557374 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -711,7 +711,7 @@ static int tree_walk_post(
 
 		if (entry_is_tree(entry)) {
 			git_tree *subtree;
-			size_t path_len = path->size;
+			size_t path_len = git_buf_len(path);
 
 			if ((error = git_tree_lookup(
 				&subtree, tree->object.repo, &entry->oid)) < 0)
diff --git a/tests-clar/diff/diff_helpers.c b/tests-clar/diff/diff_helpers.c
index c9a633cd0..74a44ab99 100644
--- a/tests-clar/diff/diff_helpers.c
+++ b/tests-clar/diff/diff_helpers.c
@@ -27,7 +27,9 @@ int diff_file_fn(
 	float progress)
 {
 	diff_expects *e = cb_data;
-	(void)progress;
+
+	GIT_UNUSED(progress);
+
 	e->files++;
 	switch (delta->status) {
 	case GIT_DELTA_ADDED: e->file_adds++; break;
@@ -48,9 +50,11 @@ int diff_hunk_fn(
 	size_t header_len)
 {
 	diff_expects *e = cb_data;
-	(void)delta;
-	(void)header;
-	(void)header_len;
+
+	GIT_UNUSED(delta);
+	GIT_UNUSED(header);
+	GIT_UNUSED(header_len);
+
 	e->hunks++;
 	e->hunk_old_lines += range->old_lines;
 	e->hunk_new_lines += range->new_lines;
@@ -60,14 +64,18 @@ int diff_hunk_fn(
 int diff_line_fn(
 	void *cb_data,
 	git_diff_delta *delta,
+	git_diff_range *range,
 	char line_origin,
 	const char *content,
 	size_t content_len)
 {
 	diff_expects *e = cb_data;
-	(void)delta;
-	(void)content;
-	(void)content_len;
+
+	GIT_UNUSED(delta);
+	GIT_UNUSED(range);
+	GIT_UNUSED(content);
+	GIT_UNUSED(content_len);
+
 	e->lines++;
 	switch (line_origin) {
 	case GIT_DIFF_LINE_CONTEXT:
diff --git a/tests-clar/diff/diff_helpers.h b/tests-clar/diff/diff_helpers.h
index 010d156fa..ca8c40177 100644
--- a/tests-clar/diff/diff_helpers.h
+++ b/tests-clar/diff/diff_helpers.h
@@ -37,6 +37,7 @@ extern int diff_hunk_fn(
 extern int diff_line_fn(
 	void *cb_data,
 	git_diff_delta *delta,
+	git_diff_range *range,
 	char line_origin,
 	const char *content,
 	size_t content_len);
diff --git a/tests-clar/diff/patch.c b/tests-clar/diff/patch.c
index e2576277f..3da9ce82b 100644
--- a/tests-clar/diff/patch.c
+++ b/tests-clar/diff/patch.c
@@ -13,26 +13,56 @@ void test_diff_patch__cleanup(void)
 	cl_git_sandbox_cleanup();
 }
 
-#define EXPECTED_OUTPUT "diff --git a/subdir.txt b/subdir.txt\n" \
+#define EXPECTED_HEADER "diff --git a/subdir.txt b/subdir.txt\n" \
 	"deleted file mode 100644\n" \
 	"index e8ee89e..0000000\n" \
 	"--- a/subdir.txt\n" \
 	"+++ /dev/null\n"
 
+#define EXPECTED_HUNK "@@ -1,2 +0,0 @@\n"
+
 static int check_removal_cb(
 	void *cb_data,
+	git_diff_delta *delta,
+	git_diff_range *range,
 	char line_origin,
-	const char *formatted_output)
+	const char *formatted_output,
+	size_t output_len)
 {
 	GIT_UNUSED(cb_data);
 
-	if (line_origin != 'F')
-		return 0;
+	switch (line_origin) {
+	case GIT_DIFF_LINE_FILE_HDR:
+		cl_assert_equal_s(EXPECTED_HEADER, formatted_output);
+		cl_assert(range == NULL);
+		goto check_delta;
+
+	case GIT_DIFF_LINE_HUNK_HDR:
+		cl_assert_equal_s(EXPECTED_HUNK, formatted_output);
+		/* Fall through */
+
+	case GIT_DIFF_LINE_CONTEXT:
+	case GIT_DIFF_LINE_DELETION:
+		goto check_range;
+
+	default:
+		/* unexpected code path */
+		return -1;
+	}
+
+check_range:
+	cl_assert(range != NULL);
+	cl_assert_equal_i(1, range->old_start);
+	cl_assert_equal_i(2, range->old_lines);
+	cl_assert_equal_i(0, range->new_start);
+	cl_assert_equal_i(0, range->new_lines);
 
-	if (strcmp(EXPECTED_OUTPUT, formatted_output) == 0)
-		return 0;
+check_delta:
+	cl_assert_equal_s("subdir.txt", delta->old.path);
+	cl_assert_equal_s("subdir.txt", delta->new.path);
+	cl_assert_equal_i(GIT_DELTA_DELETED, delta->status);
 
-	return -1;
+	return 0;
 }
 
 void test_diff_patch__can_properly_display_the_removal_of_a_file(void)