xdiff: add hunk_func()

Add a way to register a callback function that is gets passed the
start line and line count of each hunk of a diff.  Only standard
types are used.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h
index 09215afe6e..33c010b1f1 100644
--- a/xdiff/xdiff.h
+++ b/xdiff/xdiff.h
@@ -86,6 +86,10 @@ typedef struct s_xdemitcb {
 
 typedef long (*find_func_t)(const char *line, long line_len, char *buffer, long buffer_size, void *priv);
 
+typedef int (*xdl_emit_hunk_consume_func_t)(long start_a, long count_a,
+					    long start_b, long count_b,
+					    void *cb_data);
+
 typedef struct s_xdemitconf {
 	long ctxlen;
 	long interhunkctxlen;
@@ -93,6 +97,7 @@ typedef struct s_xdemitconf {
 	find_func_t find_func;
 	void *find_func_priv;
 	void (*emit_func)();
+	xdl_emit_hunk_consume_func_t hunk_func;
 } xdemitconf_t;
 
 typedef struct s_bdiffparam {