The fifteenth batch
[alt-git.git] / diffcore-rotate.c
blob533986cf632d4231fd067b244e2776a256af8e3e
1 /*
2 * Copyright (C) 2021, Google LLC.
3 * Based on diffcore-order.c, which is Copyright (C) 2005, Junio C Hamano
4 */
5 #include "git-compat-util.h"
6 #include "gettext.h"
7 #include "diff.h"
8 #include "diffcore.h"
10 void diffcore_rotate(struct diff_options *opt)
12 struct diff_queue_struct *q = &diff_queued_diff;
13 struct diff_queue_struct outq;
14 int rotate_to, i;
16 if (!q->nr)
17 return;
19 for (i = 0; i < q->nr; i++) {
20 int cmp = strcmp(opt->rotate_to, q->queue[i]->two->path);
21 if (!cmp)
22 break; /* exact match */
23 if (!opt->rotate_to_strict && cmp < 0)
24 break; /* q->queue[i] is now past the target pathname */
27 if (q->nr <= i) {
28 /* we did not find the specified path */
29 if (opt->rotate_to_strict)
30 die(_("No such path '%s' in the diff"), opt->rotate_to);
31 return;
34 DIFF_QUEUE_CLEAR(&outq);
35 rotate_to = i;
37 for (i = rotate_to; i < q->nr; i++)
38 diff_q(&outq, q->queue[i]);
39 for (i = 0; i < rotate_to; i++) {
40 if (opt->skip_instead_of_rotate)
41 diff_free_filepair(q->queue[i]);
42 else
43 diff_q(&outq, q->queue[i]);
45 free(q->queue);
46 *q = outq;