Merge branch 'jp/string-list-api-cleanup'
[git/git.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 if (!dir)
52 die_errno("unable to open rr-cache directory");
53 while ((e = readdir(dir))) {
54 if (is_dot_or_dotdot(e->d_name))
55 continue;
56 then = rerere_created_at(e->d_name);
57 if (!then)
58 continue;
59 cutoff = (has_rerere_resolution(e->d_name)
60 ? cutoff_resolve : cutoff_noresolve);
61 if (then < now - cutoff * 86400)
62 string_list_append(&to_remove, e->d_name);
63 }
64 for (i = 0; i < to_remove.nr; i++)
65 unlink_rr_item(to_remove.items[i].string);
66 string_list_clear(&to_remove, 0);
67 }
68
69 static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
70 {
71 int i;
72 for (i = 0; i < nbuf; i++)
73 if (write_in_full(1, ptr[i].ptr, ptr[i].size) != ptr[i].size)
74 return -1;
75 return 0;
76 }
77
78 static int diff_two(const char *file1, const char *label1,
79 const char *file2, const char *label2)
80 {
81 xpparam_t xpp;
82 xdemitconf_t xecfg;
83 xdemitcb_t ecb;
84 mmfile_t minus, plus;
85
86 if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
87 return 1;
88
89 printf("--- a/%s\n+++ b/%s\n", label1, label2);
90 fflush(stdout);
91 memset(&xpp, 0, sizeof(xpp));
92 xpp.flags = 0;
93 memset(&xecfg, 0, sizeof(xecfg));
94 xecfg.ctxlen = 3;
95 ecb.outf = outf;
96 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
97
98 free(minus.ptr);
99 free(plus.ptr);
100 return 0;
101 }
102
103 int cmd_rerere(int argc, const char **argv, const char *prefix)
104 {
105 struct string_list merge_rr = { NULL, 0, 0, 1 };
106 int i, fd, flags = 0;
107
108 if (2 < argc) {
109 if (!strcmp(argv[1], "-h"))
110 usage(git_rerere_usage);
111 if (!strcmp(argv[1], "--rerere-autoupdate"))
112 flags = RERERE_AUTOUPDATE;
113 else if (!strcmp(argv[1], "--no-rerere-autoupdate"))
114 flags = RERERE_NOAUTOUPDATE;
115 if (flags) {
116 argc--;
117 argv++;
118 }
119 }
120 if (argc < 2)
121 return rerere(flags);
122
123 if (!strcmp(argv[1], "forget")) {
124 const char **pathspec = get_pathspec(prefix, argv + 2);
125 return rerere_forget(pathspec);
126 }
127
128 fd = setup_rerere(&merge_rr, flags);
129 if (fd < 0)
130 return 0;
131
132 if (!strcmp(argv[1], "clear")) {
133 for (i = 0; i < merge_rr.nr; i++) {
134 const char *name = (const char *)merge_rr.items[i].util;
135 if (!has_rerere_resolution(name))
136 unlink_rr_item(name);
137 }
138 unlink_or_warn(git_path("rr-cache/MERGE_RR"));
139 } else if (!strcmp(argv[1], "gc"))
140 garbage_collect(&merge_rr);
141 else if (!strcmp(argv[1], "status"))
142 for (i = 0; i < merge_rr.nr; i++)
143 printf("%s\n", merge_rr.items[i].string);
144 else if (!strcmp(argv[1], "diff"))
145 for (i = 0; i < merge_rr.nr; i++) {
146 const char *path = merge_rr.items[i].string;
147 const char *name = (const char *)merge_rr.items[i].util;
148 diff_two(rerere_path(name, "preimage"), path, path, path);
149 }
150 else
151 usage(git_rerere_usage);
152
153 string_list_clear(&merge_rr, 1);
154 return 0;
155 }