git

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