Merge branch 'dm/maint-docco' into maint
[git/dkf.git] / builtin-rerere.c
blobbd8fc77a7a65a21a401f917b75d36883cda634ed
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"
9 static const char git_rerere_usage[] =
10 "git rerere [clear | status | diff | gc]";
12 /* these values are days */
13 static int cutoff_noresolve = 15;
14 static int cutoff_resolve = 60;
16 static const char *rr_path(const char *name, const char *file)
18 return git_path("rr-cache/%s/%s", name, file);
21 static time_t rerere_created_at(const char *name)
23 struct stat st;
24 return stat(rr_path(name, "preimage"), &st) ? (time_t) 0 : st.st_mtime;
27 static int has_resolution(const char *name)
29 struct stat st;
30 return !stat(rr_path(name, "postimage"), &st);
33 static void unlink_rr_item(const char *name)
35 unlink(rr_path(name, "thisimage"));
36 unlink(rr_path(name, "preimage"));
37 unlink(rr_path(name, "postimage"));
38 rmdir(git_path("rr-cache/%s", name));
41 static int git_rerere_gc_config(const char *var, const char *value, void *cb)
43 if (!strcmp(var, "gc.rerereresolved"))
44 cutoff_resolve = git_config_int(var, value);
45 else if (!strcmp(var, "gc.rerereunresolved"))
46 cutoff_noresolve = git_config_int(var, value);
47 else
48 return git_default_config(var, value, cb);
49 return 0;
52 static void garbage_collect(struct string_list *rr)
54 struct string_list to_remove = { NULL, 0, 0, 1 };
55 DIR *dir;
56 struct dirent *e;
57 int i, cutoff;
58 time_t now = time(NULL), then;
60 git_config(git_rerere_gc_config, NULL);
61 dir = opendir(git_path("rr-cache"));
62 while ((e = readdir(dir))) {
63 if (is_dot_or_dotdot(e->d_name))
64 continue;
65 then = rerere_created_at(e->d_name);
66 if (!then)
67 continue;
68 cutoff = (has_resolution(e->d_name)
69 ? cutoff_resolve : cutoff_noresolve);
70 if (then < now - cutoff * 86400)
71 string_list_append(e->d_name, &to_remove);
73 for (i = 0; i < to_remove.nr; i++)
74 unlink_rr_item(to_remove.items[i].string);
75 string_list_clear(&to_remove, 0);
78 static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
80 int i;
81 for (i = 0; i < nbuf; i++)
82 if (write_in_full(1, ptr[i].ptr, ptr[i].size) != ptr[i].size)
83 return -1;
84 return 0;
87 static int diff_two(const char *file1, const char *label1,
88 const char *file2, const char *label2)
90 xpparam_t xpp;
91 xdemitconf_t xecfg;
92 xdemitcb_t ecb;
93 mmfile_t minus, plus;
95 if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
96 return 1;
98 printf("--- a/%s\n+++ b/%s\n", label1, label2);
99 fflush(stdout);
100 memset(&xpp, 0, sizeof(xpp));
101 xpp.flags = XDF_NEED_MINIMAL;
102 memset(&xecfg, 0, sizeof(xecfg));
103 xecfg.ctxlen = 3;
104 ecb.outf = outf;
105 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
107 free(minus.ptr);
108 free(plus.ptr);
109 return 0;
112 int cmd_rerere(int argc, const char **argv, const char *prefix)
114 struct string_list merge_rr = { NULL, 0, 0, 1 };
115 int i, fd;
117 if (argc < 2)
118 return rerere();
120 fd = setup_rerere(&merge_rr);
121 if (fd < 0)
122 return 0;
124 if (!strcmp(argv[1], "clear")) {
125 for (i = 0; i < merge_rr.nr; i++) {
126 const char *name = (const char *)merge_rr.items[i].util;
127 if (!has_resolution(name))
128 unlink_rr_item(name);
130 unlink(git_path("rr-cache/MERGE_RR"));
131 } else if (!strcmp(argv[1], "gc"))
132 garbage_collect(&merge_rr);
133 else if (!strcmp(argv[1], "status"))
134 for (i = 0; i < merge_rr.nr; i++)
135 printf("%s\n", merge_rr.items[i].string);
136 else if (!strcmp(argv[1], "diff"))
137 for (i = 0; i < merge_rr.nr; i++) {
138 const char *path = merge_rr.items[i].string;
139 const char *name = (const char *)merge_rr.items[i].util;
140 diff_two(rr_path(name, "preimage"), path, path, path);
142 else
143 usage(git_rerere_usage);
145 string_list_clear(&merge_rr, 1);
146 return 0;