git.oblomov.eu Git - git/blob - builtin/bisect--helper.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "parse-options.h"
   4 #include "bisect.h"
   5 #include "refs.h"
   6
   7 static GIT_PATH_FUNC(git_path_bisect_terms, "BISECT_TERMS")
   8
   9 static const char * const git_bisect_helper_usage[] = {
  10         N_("git bisect--helper --next-all [--no-checkout]"),
  11         N_("git bisect--helper --write-terms <bad_term> <good_term>"),
  12         NULL
  13 };
  14
  15 /*
  16  * Check whether the string `term` belongs to the set of strings
  17  * included in the variable arguments.
  18  */
  19 LAST_ARG_MUST_BE_NULL
  20 static int one_of(const char *term, ...)
  21 {
  22         int res = 0;
  23         va_list matches;
  24         const char *match;
  25
  26         va_start(matches, term);
  27         while (!res && (match = va_arg(matches, const char *)))
  28                 res = !strcmp(term, match);
  29         va_end(matches);
  30
  31         return res;
  32 }
  33
  34 static int check_term_format(const char *term, const char *orig_term)
  35 {
  36         int res;
  37         char *new_term = xstrfmt("refs/bisect/%s", term);
  38
  39         res = check_refname_format(new_term, 0);
  40         free(new_term);
  41
  42         if (res)
  43                 return error(_("'%s' is not a valid term"), term);
  44
  45         if (one_of(term, "help", "start", "skip", "next", "reset",
  46                         "visualize", "replay", "log", "run", "terms", NULL))
  47                 return error(_("can't use the builtin command '%s' as a term"), term);
  48
  49         /*
  50          * In theory, nothing prevents swapping completely good and bad,
  51          * but this situation could be confusing and hasn't been tested
  52          * enough. Forbid it for now.
  53          */
  54
  55         if ((strcmp(orig_term, "bad") && one_of(term, "bad", "new", NULL)) ||
  56                  (strcmp(orig_term, "good") && one_of(term, "good", "old", NULL)))
  57                 return error(_("can't change the meaning of the term '%s'"), term);
  58
  59         return 0;
  60 }
  61
  62 static int write_terms(const char *bad, const char *good)
  63 {
  64         FILE *fp = NULL;
  65         int res;
  66
  67         if (!strcmp(bad, good))
  68                 return error(_("please use two different terms"));
  69
  70         if (check_term_format(bad, "bad") || check_term_format(good, "good"))
  71                 return -1;
  72
  73         fp = fopen(git_path_bisect_terms(), "w");
  74         if (!fp)
  75                 return error_errno(_("could not open the file BISECT_TERMS"));
  76
  77         res = fprintf(fp, "%s\n%s\n", bad, good);
  78         res |= fclose(fp);
  79         return (res < 0) ? -1 : 0;
  80 }
  81
  82 int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
  83 {
  84         enum {
  85                 NEXT_ALL = 1,
  86                 WRITE_TERMS
  87         } cmdmode = 0;
  88         int no_checkout = 0;
  89         struct option options[] = {
  90                 OPT_CMDMODE(0, "next-all", &cmdmode,
  91                          N_("perform 'git bisect next'"), NEXT_ALL),
  92                 OPT_CMDMODE(0, "write-terms", &cmdmode,
  93                          N_("write the terms to .git/BISECT_TERMS"), WRITE_TERMS),
  94                 OPT_BOOL(0, "no-checkout", &no_checkout,
  95                          N_("update BISECT_HEAD instead of checking out the current commit")),
  96                 OPT_END()
  97         };
  98
  99         argc = parse_options(argc, argv, prefix, options,
 100                              git_bisect_helper_usage, 0);
 101
 102         if (!cmdmode)
 103                 usage_with_options(git_bisect_helper_usage, options);
 104
 105         switch (cmdmode) {
 106         case NEXT_ALL:
 107                 return bisect_next_all(prefix, no_checkout);
 108         case WRITE_TERMS:
 109                 if (argc != 2)
 110                         return error(_("--write-terms requires two arguments"));
 111                 return write_terms(argv[0], argv[1]);
 112         default:
 113                 return error("BUG: unknown subcommand '%d'", cmdmode);
 114         }
 115         return 0;
 116 }