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/*
 * Copyright (C) 2021, Google LLC.
 * Based on diffcore-order.c, which is Copyright (C) 2005, Junio C Hamano
 */
#include "cache.h"
#include "diff.h"
#include "diffcore.h"
 
void diffcore_rotate(struct diff_options *opt)
{
	struct diff_queue_struct *q = &diff_queued_diff;
	struct diff_queue_struct outq;
	int rotate_to, i;
 
	if (!q->nr)
		return;
 
	for (i = 0; i < q->nr; i++) {
		int cmp = strcmp(opt->rotate_to, q->queue[i]->two->path);
		if (!cmp)
			break; /* exact match */
		if (!opt->rotate_to_strict && cmp < 0)
			break; /* q->queue[i] is now past the target pathname */
	}
 
	if (q->nr <= i) {
		/* we did not find the specified path */
		if (opt->rotate_to_strict)
			die(_("No such path '%s' in the diff"), opt->rotate_to);
		return;
	}
 
	DIFF_QUEUE_CLEAR(&outq);
	rotate_to = i;
 
	for (i = rotate_to; i < q->nr; i++)
		diff_q(&outq, q->queue[i]);
	for (i = 0; i < rotate_to; i++) {
		if (opt->skip_instead_of_rotate)
			diff_free_filepair(q->queue[i]);
		else
			diff_q(&outq, q->queue[i]);
	}
	free(q->queue);
	*q = outq;
}