Function render_hunk

add-patch.c:791–852

}

static void render_hunk(struct add_p_state *s, struct hunk *hunk,
			ssize_t delta, int colored, struct strbuf *out)
{
	struct hunk_header *header = &hunk->header;

	if (hunk->header.old_offset != 0 || hunk->header.new_offset != 0) {
		/*
		 * Generate the hunk header dynamically, except for special
		 * hunks (such as the diff header).
		 */
		const char *p;
		size_t len;
		unsigned long old_offset = header->old_offset;
		unsigned long new_offset = header->new_offset;

		if (!colored) {
			p = s->plain.buf + header->extra_start;
			len = header->extra_end - header->extra_start;
		} else if (header->suppress_colored_line_range) {
			strbuf_add(out,
				   s->colored.buf + header->colored_extra_start,
				   header->colored_extra_end -
				   header->colored_extra_start);

			strbuf_add(out, s->colored.buf + hunk->colored_start,
				   hunk->colored_end - hunk->colored_start);
			return;
		} else {
			strbuf_addstr(out, s->cfg.fraginfo_color);
			p = s->colored.buf + header->colored_extra_start;
			len = header->colored_extra_end
				- header->colored_extra_start;
		}

		if (s->mode->is_reverse)
			old_offset -= delta;
		else
			new_offset += delta;

		strbuf_addf(out, "@@ -%lu", old_offset);
		if (header->old_count != 1)
			strbuf_addf(out, ",%lu", header->old_count);
		strbuf_addf(out, " +%lu", new_offset);
		if (header->new_count != 1)
			strbuf_addf(out, ",%lu", header->new_count);
		strbuf_addstr(out, " @@");

		if (len)
			strbuf_add(out, p, len);
		else if (colored)
			strbuf_addf(out, "%s\n", s->cfg.reset_color_diff);
		else
			strbuf_addch(out, '\n');
	}

	if (colored)
		strbuf_add(out, s->colored.buf + hunk->colored_start,
			   hunk->colored_end - hunk->colored_start);