diffcore-order.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 char **order;
   9 static int order_cnt;
  10
  11 static void prepare_order(const char *orderfile)
  12 {
  13         int fd, cnt, pass;
  14         void *map;
  15         char *cp, *endp;
  16         struct stat st;
  17         size_t sz;
  18
  19         if (order)
  20                 return;
  21
  22         fd = open(orderfile, O_RDONLY);
  23         if (fd < 0)
  24                 return;
  25         if (fstat(fd, &st)) {
  26                 close(fd);
  27                 return;
  28         }
  29         sz = xsize_t(st.st_size);
  30         map = mmap(NULL, sz, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
  31         close(fd);
  32         if (map == MAP_FAILED)
  33                 return;
  34         endp = (char *) map + sz;
  35         for (pass = 0; pass < 2; pass++) {
  36                 cnt = 0;
  37                 cp = map;
  38                 while (cp < endp) {
  39                         char *ep;
  40                         for (ep = cp; ep < endp && *ep != '\n'; ep++)
  41                                 ;
  42                         /* cp to ep has one line */
  43                         if (*cp == '\n' || *cp == '#')
  44                                 ; /* comment */
  45                         else if (pass == 0)
  46                                 cnt++;
  47                         else {
  48                                 if (*ep == '\n') {
  49                                         *ep = 0;
  50                                         order[cnt] = cp;
  51                                 }
  52                                 else {
  53                                         order[cnt] = xmalloc(ep-cp+1);
  54                                         memcpy(order[cnt], cp, ep-cp);
  55                                         order[cnt][ep-cp] = 0;
  56                                 }
  57                                 cnt++;
  58                         }
  59                         if (ep < endp)
  60                                 ep++;
  61                         cp = ep;
  62                 }
  63                 if (pass == 0) {
  64                         order_cnt = cnt;
  65                         order = xmalloc(sizeof(*order) * cnt);
  66                 }
  67         }
  68 }
  69
  70 struct pair_order {
  71         struct diff_filepair *pair;
  72         int orig_order;
  73         int order;
  74 };
  75
  76 static int match_order(const char *path)
  77 {
  78         int i;
  79         char p[PATH_MAX];
  80
  81         for (i = 0; i < order_cnt; i++) {
  82                 strcpy(p, path);
  83                 while (p[0]) {
  84                         char *cp;
  85                         if (!fnmatch(order[i], p, 0))
  86                                 return i;
  87                         cp = strrchr(p, '/');
  88                         if (!cp)
  89                                 break;
  90                         *cp = 0;
  91                 }
  92         }
  93         return order_cnt;
  94 }
  95
  96 static int compare_pair_order(const void *a_, const void *b_)
  97 {
  98         struct pair_order const *a, *b;
  99         a = (struct pair_order const *)a_;
 100         b = (struct pair_order const *)b_;
 101         if (a->order != b->order)
 102                 return a->order - b->order;
 103         return a->orig_order - b->orig_order;
 104 }
 105
 106 void diffcore_order(const char *orderfile)
 107 {
 108         struct diff_queue_struct *q = &diff_queued_diff;
 109         struct pair_order *o;
 110         int i;
 111
 112         if (!q->nr)
 113                 return;
 114
 115         o = xmalloc(sizeof(*o) * q->nr);
 116         prepare_order(orderfile);
 117         for (i = 0; i < q->nr; i++) {
 118                 o[i].pair = q->queue[i];
 119                 o[i].orig_order = i;
 120                 o[i].order = match_order(o[i].pair->two->path);
 121         }
 122         qsort(o, q->nr, sizeof(*o), compare_pair_order);
 123         for (i = 0; i < q->nr; i++)
 124                 q->queue[i] = o[i].pair;
 125         free(o);
 126         return;
 127 }