/* See LICENSE file for copyright and license details. */
#include "common.h"


int
libpatch_format_ed_patch(struct libpatch_diff2_printer *printer, struct libpatch_diff2 *diff, size_t difflen,
                         const struct libpatch_file *file1, const struct libpatch_file *file2)
{
	size_t i, j, n, ai, bi, bj, an, bn;
	int stopped;

	ai = file1->nlines;
	bi = file2->nlines;
	for (i = difflen; (n = libpatch_previous_hunk(diff, &i, &ai, &bi, &an, &bn, 1));) {
		printer->put_hunk_head_prefix(printer, "", 0);
		printer->put_hunk_start(printer, "", ai + (an ? 1U : 0U), 1);
		if (an > 1)
			printer->put_hunk_end(printer, ",", ai + an, 1);
		printer->put_hunk_operation(printer, !bn ? "d" : !an ? "a" : "c", an > 0, bn > 0);
		printer->put_hunk_head_suffix(printer, "", 0);
		printer->put_newline(printer);

		if (bn) {
			bj = bi;
			stopped = 0;
			for (; i < n; i++) {
				for (j = 0; j < diff[i].repetition; j++) {
					if (diff[i].change != LIBPATCH_DIFF2_FILE1_ONLY) {
						if (stopped) {
							stopped = 0;
							printer->put_end_of_change(printer, "a");
							printer->put_newline(printer);
						}
						printer->put_change_prefix(printer, "", 2, an > 0, bj);
						if (file2->lines[bj]->len == 1 && file2->lines[bj]->text[0] == '.') {
							printer->put_syntactical_escape(printer, ".");
							printer->put_line(printer, file2->lines[bj++]);
							printer->put_newline(printer);
							printer->put_end_of_change(printer, ".");
							printer->put_newline(printer);
							printer->put_end_of_change(printer, "s/.//");
							printer->put_newline(printer);
							stopped = 1;
						} else {
							printer->put_line(printer, file2->lines[bj++]);
							printer->put_newline(printer);
						}
					}
				}
			}
			if (!stopped)
				printer->put_end_of_change(printer, ".");
			printer->put_newline(printer);
		}
	}

	return 0;
}