builtin/rerere.c

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