diffcore-rotate.c

   1 /*
   2  * Copyright (C) 2021, Google LLC.
   3  * Based on diffcore-order.c, which is Copyright (C) 2005, Junio C Hamano
   4  */
   5
   6 #include "git-compat-util.h"
   7 #include "gettext.h"
   8 #include "diff.h"
   9 #include "diffcore.h"
  10
  11 void diffcore_rotate(struct diff_options *opt)
  12 {
  13         struct diff_queue_struct *q = &diff_queued_diff;
  14         struct diff_queue_struct outq = DIFF_QUEUE_INIT;
  15         int rotate_to, i;
  16
  17         if (!q->nr)
  18                 return;
  19
  20         for (i = 0; i < q->nr; i++) {
  21                 int cmp = strcmp(opt->rotate_to, q->queue[i]->two->path);
  22                 if (!cmp)
  23                         break; /* exact match */
  24                 if (!opt->rotate_to_strict && cmp < 0)
  25                         break; /* q->queue[i] is now past the target pathname */
  26         }
  27
  28         if (q->nr <= i) {
  29                 /* we did not find the specified path */
  30                 if (opt->rotate_to_strict)
  31                         die(_("No such path '%s' in the diff"), opt->rotate_to);
  32                 return;
  33         }
  34
  35         rotate_to = i;
  36
  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]);
  44         }
  45         free(q->queue);
  46         *q = outq;
  47 }