t1301: do not change $CWD in "shared=all" test case
[alt-git.git] / diffcore-rotate.c
blob445f060ab0010ede4009b92c3d4acb0b34f644b9
1 /*
2 * Copyright (C) 2021, Google LLC.
3 * Based on diffcore-order.c, which is Copyright (C) 2005, Junio C Hamano
4 */
5 #include "cache.h"
6 #include "diff.h"
7 #include "diffcore.h"
9 void diffcore_rotate(struct diff_options *opt)
11 struct diff_queue_struct *q = &diff_queued_diff;
12 struct diff_queue_struct outq;
13 int rotate_to, i;
15 if (!q->nr)
16 return;
18 for (i = 0; i < q->nr; i++) {
19 int cmp = strcmp(opt->rotate_to, q->queue[i]->two->path);
20 if (!cmp)
21 break; /* exact match */
22 if (!opt->rotate_to_strict && cmp < 0)
23 break; /* q->queue[i] is now past the target pathname */
26 if (q->nr <= i) {
27 /* we did not find the specified path */
28 if (opt->rotate_to_strict)
29 die(_("No such path '%s' in the diff"), opt->rotate_to);
30 return;
33 DIFF_QUEUE_CLEAR(&outq);
34 rotate_to = i;
36 for (i = rotate_to; i < q->nr; i++)
37 diff_q(&outq, q->queue[i]);
38 for (i = 0; i < rotate_to; i++) {
39 if (opt->skip_instead_of_rotate)
40 diff_free_filepair(q->queue[i]);
41 else
42 diff_q(&outq, q->queue[i]);
44 free(q->queue);
45 *q = outq;