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