Structure describing options about how the diff should be executed.

Setting all values of the structure to zero will yield the default values. Similarly, passing NULL for the options structure will give the defaults. The default values are marked below.

• flags is a combination of the git_diff_option_t values above
• context_lines is the number of unchanged lines that define the boundary of a hunk (and to display before and after)
• interhunk_lines is the maximum number of unchanged lines between hunk boundaries before the hunks will be merged into a one.
• old_prefix is the virtual "directory" to prefix to old file names in hunk headers (default "a")
• new_prefix is the virtual "directory" to prefix to new file names in hunk headers (default "b")
• pathspec is an array of paths / fnmatch patterns to constrain diff
• max_size is a file size (in bytes) above which a blob will be marked as binary automatically; pass a negative value to disable.
• notify_cb is an optional callback function, notifying the consumer of changes to the diff as new deltas are added.
• progress_cb is an optional callback function, notifying the consumer of which files are being examined as the diff is generated.
• payload is the payload to pass to the callback functions.
• ignore_submodules overrides the submodule ignore setting for all submodules in the diff.