Create git_diff_line and extend git_diff_hunk

Instead of having functions with so very many parameters to pass
hunk and line data, this takes the existing git_diff_hunk struct
and extends it with more hunk data, plus adds a git_diff_line.
Those structs are used to pass back hunk and line data instead of
the old APIs that took tons of parameters.

Some work that was previously only being done for git_diff_patch
creation (scanning the diff content for exact line counts) is now
done for all callbacks, but the performance difference should not
be noticable.

1 files changed, 21 insertions, 10 deletions

diff --git a/include/git2/diff.h b/include/git2/diff.h
index f1572cbd5..ed9f71355 100644
--- a/include/git2/diff.h
+++ b/include/git2/diff.h
@@ -385,10 +385,12 @@ typedef int (*git_diff_file_cb)(
  */
 typedef struct git_diff_hunk git_diff_hunk;
 struct git_diff_hunk {
-	int old_start; /** Starting line number in old_file */
-	int old_lines; /** Number of lines in old_file */
-	int new_start; /** Starting line number in new_file */
-	int new_lines; /** Number of lines in new_file */
+	int    old_start;     /** Starting line number in old_file */
+	int    old_lines;     /** Number of lines in old_file */
+	int    new_start;     /** Starting line number in new_file */
+	int    new_lines;     /** Number of lines in new_file */
+	size_t header_len;    /** Number of bytes in header text */
+	char   header[128];   /** Header text, NUL-byte terminated */
 };
 
 /**
@@ -397,8 +399,6 @@ struct git_diff_hunk {
 typedef int (*git_diff_hunk_cb)(
 	const git_diff_delta *delta,
 	const git_diff_hunk *hunk,
-	const char *header,
-	size_t header_len,
 	void *payload);
 
 /**
@@ -429,6 +429,19 @@ typedef enum {
 } git_diff_line_t;
 
 /**
+ * Structure describing a line (or data span) of a diff.
+ */
+typedef struct git_diff_line git_diff_line;
+struct git_diff_line {
+	char   origin;       /** A git_diff_line_t value */
+	int    old_lineno;   /** Line number in old file or -1 for added line */
+	int    new_lineno;   /** Line number in new file or -1 for deleted line */
+	int    num_lines;    /** Number of newline characters in content */
+	size_t content_len;  /** Number of bytes of data */
+	const char *content; /** Pointer to diff text, not NUL-byte terminated */
+};
+
+/**
  * When iterating over a diff, callback that will be made per text diff
  * line. In this context, the provided range will be NULL.
  *
@@ -438,10 +451,8 @@ typedef enum {
  */
 typedef int (*git_diff_line_cb)(
 	const git_diff_delta *delta, /** delta that contains this data */
-	const git_diff_hunk *hunk,   /** range of lines containing this data */
-	char line_origin,            /** git_diff_t value from above */
-	const char *content,         /** diff data - not NUL terminated */
-	size_t content_len,          /** number of bytes of diff data */
+	const git_diff_hunk *hunk,   /** hunk containing this data */
+	const git_diff_line *line,   /** line data */
 	void *payload);              /** user reference data */
 
 /**