Merge branch 'jn/gitweb-log-history'
[git] / builtin-rerere.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "dir.h"
4 #include "string-list.h"
5 #include "rerere.h"
6 #include "xdiff/xdiff.h"
7 #include "xdiff-interface.h"
8
9 static const char git_rerere_usage[] =
10 "git rerere [clear | status | diff | gc]";
11
12 /* these values are days */
13 static int cutoff_noresolve = 15;
14 static int cutoff_resolve = 60;
15
16 static time_t rerere_created_at(const char *name)
17 {
18         struct stat st;
19         return stat(rerere_path(name, "preimage"), &st) ? (time_t) 0 : st.st_mtime;
20 }
21
22 static void unlink_rr_item(const char *name)
23 {
24         unlink(rerere_path(name, "thisimage"));
25         unlink(rerere_path(name, "preimage"));
26         unlink(rerere_path(name, "postimage"));
27         rmdir(git_path("rr-cache/%s", name));
28 }
29
30 static int git_rerere_gc_config(const char *var, const char *value, void *cb)
31 {
32         if (!strcmp(var, "gc.rerereresolved"))
33                 cutoff_resolve = git_config_int(var, value);
34         else if (!strcmp(var, "gc.rerereunresolved"))
35                 cutoff_noresolve = git_config_int(var, value);
36         else
37                 return git_default_config(var, value, cb);
38         return 0;
39 }
40
41 static void garbage_collect(struct string_list *rr)
42 {
43         struct string_list to_remove = { NULL, 0, 0, 1 };
44         DIR *dir;
45         struct dirent *e;
46         int i, cutoff;
47         time_t now = time(NULL), then;
48
49         git_config(git_rerere_gc_config, NULL);
50         dir = opendir(git_path("rr-cache"));
51         while ((e = readdir(dir))) {
52                 if (is_dot_or_dotdot(e->d_name))
53                         continue;
54                 then = rerere_created_at(e->d_name);
55                 if (!then)
56                         continue;
57                 cutoff = (has_rerere_resolution(e->d_name)
58                           ? cutoff_resolve : cutoff_noresolve);
59                 if (then < now - cutoff * 86400)
60                         string_list_append(e->d_name, &to_remove);
61         }
62         for (i = 0; i < to_remove.nr; i++)
63                 unlink_rr_item(to_remove.items[i].string);
64         string_list_clear(&to_remove, 0);
65 }
66
67 static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
68 {
69         int i;
70         for (i = 0; i < nbuf; i++)
71                 if (write_in_full(1, ptr[i].ptr, ptr[i].size) != ptr[i].size)
72                         return -1;
73         return 0;
74 }
75
76 static int diff_two(const char *file1, const char *label1,
77                 const char *file2, const char *label2)
78 {
79         xpparam_t xpp;
80         xdemitconf_t xecfg;
81         xdemitcb_t ecb;
82         mmfile_t minus, plus;
83
84         if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
85                 return 1;
86
87         printf("--- a/%s\n+++ b/%s\n", label1, label2);
88         fflush(stdout);
89         memset(&xpp, 0, sizeof(xpp));
90         xpp.flags = XDF_NEED_MINIMAL;
91         memset(&xecfg, 0, sizeof(xecfg));
92         xecfg.ctxlen = 3;
93         ecb.outf = outf;
94         xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
95
96         free(minus.ptr);
97         free(plus.ptr);
98         return 0;
99 }
100
101 int cmd_rerere(int argc, const char **argv, const char *prefix)
102 {
103         struct string_list merge_rr = { NULL, 0, 0, 1 };
104         int i, fd;
105
106         if (argc < 2)
107                 return rerere();
108
109         if (!strcmp(argv[1], "-h"))
110                 usage(git_rerere_usage);
111
112         fd = setup_rerere(&merge_rr);
113         if (fd < 0)
114                 return 0;
115
116         if (!strcmp(argv[1], "clear")) {
117                 for (i = 0; i < merge_rr.nr; i++) {
118                         const char *name = (const char *)merge_rr.items[i].util;
119                         if (!has_rerere_resolution(name))
120                                 unlink_rr_item(name);
121                 }
122                 unlink_or_warn(git_path("rr-cache/MERGE_RR"));
123         } else if (!strcmp(argv[1], "gc"))
124                 garbage_collect(&merge_rr);
125         else if (!strcmp(argv[1], "status"))
126                 for (i = 0; i < merge_rr.nr; i++)
127                         printf("%s\n", merge_rr.items[i].string);
128         else if (!strcmp(argv[1], "diff"))
129                 for (i = 0; i < merge_rr.nr; i++) {
130                         const char *path = merge_rr.items[i].string;
131                         const char *name = (const char *)merge_rr.items[i].util;
132                         diff_two(rerere_path(name, "preimage"), path, path, path);
133                 }
134         else
135                 usage(git_rerere_usage);
136
137         string_list_clear(&merge_rr, 1);
138         return 0;
139 }