builtin/rerere.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "config.h"
   4 #include "dir.h"
   5 #include "parse-options.h"
   6 #include "string-list.h"
   7 #include "rerere.h"
   8 #include "xdiff/xdiff.h"
   9 #include "xdiff-interface.h"
  10 #include "pathspec.h"
  11
  12 static const char * const rerere_usage[] = {
  13         N_("git rerere [clear | forget <path>... | status | remaining | diff | gc]"),
  14         NULL,
  15 };
  16
  17 static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
  18 {
  19         int i;
  20         for (i = 0; i < nbuf; i++)
  21                 if (write_in_full(1, ptr[i].ptr, ptr[i].size) < 0)
  22                         return -1;
  23         return 0;
  24 }
  25
  26 static int diff_two(const char *file1, const char *label1,
  27                 const char *file2, const char *label2)
  28 {
  29         xpparam_t xpp;
  30         xdemitconf_t xecfg;
  31         xdemitcb_t ecb;
  32         mmfile_t minus, plus;
  33         int ret;
  34
  35         if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
  36                 return -1;
  37
  38         printf("--- a/%s\n+++ b/%s\n", label1, label2);
  39         fflush(stdout);
  40         memset(&xpp, 0, sizeof(xpp));
  41         xpp.flags = 0;
  42         memset(&xecfg, 0, sizeof(xecfg));
  43         xecfg.ctxlen = 3;
  44         ecb.outf = outf;
  45         ret = xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
  46
  47         free(minus.ptr);
  48         free(plus.ptr);
  49         return ret;
  50 }
  51
  52 int cmd_rerere(int argc, const char **argv, const char *prefix)
  53 {
  54         struct string_list merge_rr = STRING_LIST_INIT_DUP;
  55         int i, autoupdate = -1, flags = 0;
  56
  57         struct option options[] = {
  58                 OPT_SET_INT(0, "rerere-autoupdate", &autoupdate,
  59                         N_("register clean resolutions in index"), 1),
  60                 OPT_END(),
  61         };
  62
  63         argc = parse_options(argc, argv, prefix, options, rerere_usage, 0);
  64
  65         git_config(git_xmerge_config, NULL);
  66
  67         if (autoupdate == 1)
  68                 flags = RERERE_AUTOUPDATE;
  69         if (autoupdate == 0)
  70                 flags = RERERE_NOAUTOUPDATE;
  71
  72         if (argc < 1)
  73                 return rerere(flags);
  74
  75         if (!strcmp(argv[0], "forget")) {
  76                 struct pathspec pathspec;
  77                 if (argc < 2)
  78                         warning("'git rerere forget' without paths is deprecated");
  79                 parse_pathspec(&pathspec, 0, PATHSPEC_PREFER_CWD,
  80                                prefix, argv + 1);
  81                 return rerere_forget(&pathspec);
  82         }
  83
  84         if (!strcmp(argv[0], "clear")) {
  85                 rerere_clear(&merge_rr);
  86         } else if (!strcmp(argv[0], "gc"))
  87                 rerere_gc(&merge_rr);
  88         else if (!strcmp(argv[0], "status")) {
  89                 if (setup_rerere(&merge_rr, flags | RERERE_READONLY) < 0)
  90                         return 0;
  91                 for (i = 0; i < merge_rr.nr; i++)
  92                         printf("%s\n", merge_rr.items[i].string);
  93         } else if (!strcmp(argv[0], "remaining")) {
  94                 rerere_remaining(&merge_rr);
  95                 for (i = 0; i < merge_rr.nr; i++) {
  96                         if (merge_rr.items[i].util != RERERE_RESOLVED)
  97                                 printf("%s\n", merge_rr.items[i].string);
  98                         else
  99                                 /* prepare for later call to
 100                                  * string_list_clear() */
 101                                 merge_rr.items[i].util = NULL;
 102                 }
 103         } else if (!strcmp(argv[0], "diff")) {
 104                 if (setup_rerere(&merge_rr, flags | RERERE_READONLY) < 0)
 105                         return 0;
 106                 for (i = 0; i < merge_rr.nr; i++) {
 107                         const char *path = merge_rr.items[i].string;
 108                         const struct rerere_id *id = merge_rr.items[i].util;
 109                         if (diff_two(rerere_path(id, "preimage"), path, path, path))
 110                                 die("unable to generate diff for %s", rerere_path(id, NULL));
 111                 }
 112         } else
 113                 usage_with_options(rerere_usage, options);
 114
 115         string_list_clear(&merge_rr, 1);
 116         return 0;
 117 }