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 cnt, pass;
  14         struct strbuf sb = STRBUF_INIT;
  15         void *map;
  16         char *cp, *endp;
  17         ssize_t sz;
  18
  19         if (order)
  20                 return;
  21
  22         sz = strbuf_read_file(&sb, orderfile, 0);
  23         if (sz < 0)
  24                 die_errno(_("failed to read orderfile '%s'"), orderfile);
  25         map = strbuf_detach(&sb, NULL);
  26         endp = (char *) map + sz;
  27
  28         for (pass = 0; pass < 2; pass++) {
  29                 cnt = 0;
  30                 cp = map;
  31                 while (cp < endp) {
  32                         char *ep;
  33                         for (ep = cp; ep < endp && *ep != '\n'; ep++)
  34                                 ;
  35                         /* cp to ep has one line */
  36                         if (*cp == '\n' || *cp == '#')
  37                                 ; /* comment */
  38                         else if (pass == 0)
  39                                 cnt++;
  40                         else {
  41                                 if (*ep == '\n') {
  42                                         *ep = 0;
  43                                         order[cnt] = cp;
  44                                 } else {
  45                                         order[cnt] = xmemdupz(cp, ep - cp);
  46                                 }
  47                                 cnt++;
  48                         }
  49                         if (ep < endp)
  50                                 ep++;
  51                         cp = ep;
  52                 }
  53                 if (pass == 0) {
  54                         order_cnt = cnt;
  55                         order = xmalloc(sizeof(*order) * cnt);
  56                 }
  57         }
  58 }
  59
  60 static int match_order(const char *path)
  61 {
  62         int i;
  63         static struct strbuf p = STRBUF_INIT;
  64
  65         for (i = 0; i < order_cnt; i++) {
  66                 strbuf_reset(&p);
  67                 strbuf_addstr(&p, path);
  68                 while (p.buf[0]) {
  69                         char *cp;
  70                         if (!fnmatch(order[i], p.buf, 0))
  71                                 return i;
  72                         cp = strrchr(p.buf, '/');
  73                         if (!cp)
  74                                 break;
  75                         *cp = 0;
  76                 }
  77         }
  78         return order_cnt;
  79 }
  80
  81 static int compare_objs_order(const void *a_, const void *b_)
  82 {
  83         struct obj_order const *a, *b;
  84         a = (struct obj_order const *)a_;
  85         b = (struct obj_order const *)b_;
  86         if (a->order != b->order)
  87                 return a->order - b->order;
  88         return a->orig_order - b->orig_order;
  89 }
  90
  91 void order_objects(const char *orderfile, obj_path_fn_t obj_path,
  92                    struct obj_order *objs, int nr)
  93 {
  94         int i;
  95
  96         if (!nr)
  97                 return;
  98
  99         prepare_order(orderfile);
 100         for (i = 0; i < nr; i++) {
 101                 objs[i].orig_order = i;
 102                 objs[i].order = match_order(obj_path(objs[i].obj));
 103         }
 104         qsort(objs, nr, sizeof(*objs), compare_objs_order);
 105 }
 106
 107 static const char *pair_pathtwo(void *obj)
 108 {
 109         struct diff_filepair *pair = (struct diff_filepair *)obj;
 110
 111         return pair->two->path;
 112 }
 113
 114 void diffcore_order(const char *orderfile)
 115 {
 116         struct diff_queue_struct *q = &diff_queued_diff;
 117         struct obj_order *o;
 118         int i;
 119
 120         if (!q->nr)
 121                 return;
 122
 123         o = xmalloc(sizeof(*o) * q->nr);
 124         for (i = 0; i < q->nr; i++)
 125                 o[i].obj = q->queue[i];
 126         order_objects(orderfile, pair_pathtwo, o, q->nr);
 127         for (i = 0; i < q->nr; i++)
 128                 q->queue[i] = o[i].obj;
 129         free(o);
 130         return;
 131 }