diffcore-pickaxe.c

   1 /*
   2  * Copyright (C) 2005 Junio C Hamano
   3  */
   4 #include "cache.h"
   5 #include "diff.h"
   6 #include "diffcore.h"
   7
   8 static int contains(struct diff_filespec *one,
   9                     const char *needle, unsigned long len)
  10 {
  11         unsigned long offset, sz;
  12         const char *data;
  13         if (diff_populate_filespec(one, 0))
  14                 return 0;
  15         sz = one->size;
  16         data = one->data;
  17         for (offset = 0; offset + len <= sz; offset++)
  18                      if (!strncmp(needle, data + offset, len))
  19                              return 1;
  20         return 0;
  21 }
  22
  23 void diffcore_pickaxe(const char *needle, int opts)
  24 {
  25         struct diff_queue_struct *q = &diff_queued_diff;
  26         unsigned long len = strlen(needle);
  27         int i, has_changes;
  28         struct diff_queue_struct outq;
  29         outq.queue = NULL;
  30         outq.nr = outq.alloc = 0;
  31
  32         if (opts & DIFF_PICKAXE_ALL) {
  33                 /* Showing the whole changeset if needle exists */
  34                 for (i = has_changes = 0; !has_changes && i < q->nr; i++) {
  35                         struct diff_filepair *p = q->queue[i];
  36                         if (!DIFF_FILE_VALID(p->one)) {
  37                                 if (!DIFF_FILE_VALID(p->two))
  38                                         continue; /* ignore unmerged */
  39                                 /* created */
  40                                 if (contains(p->two, needle, len))
  41                                         has_changes++;
  42                         }
  43                         else if (!DIFF_FILE_VALID(p->two)) {
  44                                 if (contains(p->one, needle, len))
  45                                         has_changes++;
  46                         }
  47                         else if (!diff_unmodified_pair(p) &&
  48                                  contains(p->one, needle, len) !=
  49                                  contains(p->two, needle, len))
  50                                 has_changes++;
  51                 }
  52                 if (has_changes)
  53                         return; /* not munge the queue */
  54
  55                 /* otherwise we will clear the whole queue
  56                  * by copying the empty outq at the end of this
  57                  * function, but first clear the current entries
  58                  * in the queue.
  59                  */
  60                 for (i = 0; i < q->nr; i++)
  61                         diff_free_filepair(q->queue[i]);
  62         }
  63         else
  64                 /* Showing only the filepairs that has the needle */
  65                 for (i = 0; i < q->nr; i++) {
  66                         struct diff_filepair *p = q->queue[i];
  67                         has_changes = 0;
  68                         if (!DIFF_FILE_VALID(p->one)) {
  69                                 if (!DIFF_FILE_VALID(p->two))
  70                                         ; /* ignore unmerged */
  71                                 /* created */
  72                                 else if (contains(p->two, needle, len))
  73                                         has_changes = 1;
  74                         }
  75                         else if (!DIFF_FILE_VALID(p->two)) {
  76                                 if (contains(p->one, needle, len))
  77                                         has_changes = 1;
  78                         }
  79                         else if (!diff_unmodified_pair(p) &&
  80                                  contains(p->one, needle, len) !=
  81                                  contains(p->two, needle, len))
  82                                 has_changes = 1;
  83
  84                         if (has_changes)
  85                                 diff_q(&outq, p);
  86                         else
  87                                 diff_free_filepair(p);
  88                 }
  89
  90         free(q->queue);
  91         *q = outq;
  92         return;
  93 }