Function run_diff_cmd

diff.c:4937–4988

}

static void run_diff_cmd(const struct external_diff *pgm,
			 const char *name,
			 const char *other,
			 const char *attr_path,
			 struct diff_filespec *one,
			 struct diff_filespec *two,
			 struct strbuf *msg,
			 struct diff_options *o,
			 struct diff_filepair *p)
{
	const char *xfrm_msg = NULL;
	int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
	int must_show_header = 0;
	struct userdiff_driver *drv = NULL;

	if (o->flags.allow_external || !o->ignore_driver_algorithm)
		drv = userdiff_find_by_path(o->repo->index, attr_path);

	if (o->flags.allow_external && drv && drv->external.cmd)
		pgm = &drv->external;

	if (msg) {
		/*
		 * don't use colors when the header is intended for an
		 * external diff driver
		 */
		fill_metainfo(msg, name, other, one, two, o, p,
			      &must_show_header,
			      pgm ? GIT_COLOR_NEVER : o->use_color);
		xfrm_msg = msg->len ? msg->buf : NULL;
	}

	if (pgm) {
		run_external_diff(pgm, name, other, one, two, xfrm_msg, o);
		return;
	}
	if (one && two) {
		if (!o->ignore_driver_algorithm && drv && drv->algorithm)
			set_diff_algorithm(o, drv->algorithm);

		builtin_diff(name, other ? other : name,
			     one, two, xfrm_msg, must_show_header,
			     o, complete_rewrite, p->line_ranges);
		if (p->status == DIFF_STATUS_COPIED ||
		    p->status == DIFF_STATUS_RENAMED)
			o->found_changes = 1;
	} else {
		if (o->file)
			fprintf(o->file, "* Unmerged path %s\n", name);
		o->found_changes = 1;
	}
}

static void diff_fill_oid_info(struct diff_filespec *one, struct index_state *istate)
{