Get data about a line in a hunk of a patch.
Given a patch, a hunk index, and a line index in the hunk, this will return a lot of details about that line. If you pass a hunk index larger than the number of hunks or a line index larger than the number of lines in the hunk, this will return -1.
A GIT_DIFF_LINE constant from above
Pointer to content of diff line, not NUL-terminated
Number of characters in content
Line number in old file or -1 if line is added
Line number in new file or -1 if line is deleted
The index of the hunk
The index of the line in the hunk
0 on success, < 0 on failure