examples/rev-list.c

   1 /*
   2  * libgit2 "rev-list" example - shows how to transform a rev-spec into a list
   3  * of commit ids
   4  *
   5  * Written by the libgit2 contributors
   6  *
   7  * To the extent possible under law, the author(s) have dedicated all copyright
   8  * and related and neighboring rights to this software to the public domain
   9  * worldwide. This software is distributed without any warranty.
  10  *
  11  * You should have received a copy of the CC0 Public Domain Dedication along
  12  * with this software. If not, see
  13  * <http://creativecommons.org/publicdomain/zero/1.0/>.
  14  */
  15
  16 #include "common.h"
  17
  18 #include <assert.h>
  19
  20 static int revwalk_parse_options(git_sort_t *sort, struct args_info *args);
  21 static int revwalk_parse_revs(git_repository *repo, git_revwalk *walk, struct args_info *args);
  22
  23 int lg2_rev_list(git_repository *repo, int argc, char **argv)
  24 {
  25         struct args_info args = ARGS_INFO_INIT;
  26         git_revwalk *walk;
  27         git_oid oid;
  28         git_sort_t sort;
  29         char buf[GIT_OID_HEXSZ+1];
  30
  31         check_lg2(revwalk_parse_options(&sort, &args), "parsing options", NULL);
  32
  33         check_lg2(git_revwalk_new(&walk, repo), "allocating revwalk", NULL);
  34         git_revwalk_sorting(walk, sort);
  35         check_lg2(revwalk_parse_revs(repo, walk, &args), "parsing revs", NULL);
  36
  37         while (!git_revwalk_next(&oid, walk)) {
  38                 git_oid_fmt(buf, &oid);
  39                 buf[GIT_OID_HEXSZ] = '\0';
  40                 printf("%s\n", buf);
  41         }
  42
  43         git_revwalk_free(walk);
  44         return 0;
  45 }
  46
  47 static int push_commit(git_revwalk *walk, const git_oid *oid, int hide)
  48 {
  49         if (hide)
  50                 return git_revwalk_hide(walk, oid);
  51         else
  52                 return git_revwalk_push(walk, oid);
  53 }
  54
  55 static int push_spec(git_repository *repo, git_revwalk *walk, const char *spec, int hide)
  56 {
  57         int error;
  58         git_object *obj;
  59
  60         if ((error = git_revparse_single(&obj, repo, spec)) < 0)
  61                 return error;
  62
  63         error = push_commit(walk, git_object_id(obj), hide);
  64         git_object_free(obj);
  65         return error;
  66 }
  67
  68 static int push_range(git_repository *repo, git_revwalk *walk, const char *range, int hide)
  69 {
  70         git_revspec revspec;
  71         int error = 0;
  72
  73         if ((error = git_revparse(&revspec, repo, range)))
  74                 return error;
  75
  76         if (revspec.flags & GIT_REVPARSE_MERGE_BASE) {
  77                 /* TODO: support "<commit>...<commit>" */
  78                 return GIT_EINVALIDSPEC;
  79         }
  80
  81         if ((error = push_commit(walk, git_object_id(revspec.from), !hide)))
  82                 goto out;
  83
  84         error = push_commit(walk, git_object_id(revspec.to), hide);
  85
  86 out:
  87         git_object_free(revspec.from);
  88         git_object_free(revspec.to);
  89         return error;
  90 }
  91
  92 static void print_usage(void)
  93 {
  94         fprintf(stderr, "rev-list [--git-dir=dir] [--topo-order|--date-order] [--reverse] <revspec>\n");
  95         exit(-1);
  96 }
  97
  98 static int revwalk_parse_options(git_sort_t *sort, struct args_info *args)
  99 {
 100         assert(sort && args);
 101         *sort = GIT_SORT_NONE;
 102
 103         if (args->argc < 1)
 104                 print_usage();
 105
 106         for (args->pos = 1; args->pos < args->argc; ++args->pos) {
 107                 const char *curr = args->argv[args->pos];
 108
 109                 if (!strcmp(curr, "--topo-order")) {
 110                         *sort |= GIT_SORT_TOPOLOGICAL;
 111                 } else if (!strcmp(curr, "--date-order")) {
 112                         *sort |= GIT_SORT_TIME;
 113                 } else if (!strcmp(curr, "--reverse")) {
 114                         *sort |= (*sort & ~GIT_SORT_REVERSE) ^ GIT_SORT_REVERSE;
 115                 } else {
 116                         break;
 117                 }
 118         }
 119         return 0;
 120 }
 121
 122 static int revwalk_parse_revs(git_repository *repo, git_revwalk *walk, struct args_info *args)
 123 {
 124         int hide, error;
 125         git_oid oid;
 126
 127         hide = 0;
 128         for (; args->pos < args->argc; ++args->pos) {
 129                 const char *curr = args->argv[args->pos];
 130
 131                 if (!strcmp(curr, "--not")) {
 132                         hide = !hide;
 133                 } else if (curr[0] == '^') {
 134                         if ((error = push_spec(repo, walk, curr + 1, !hide)))
 135                                 return error;
 136                 } else if (strstr(curr, "..")) {
 137                         if ((error = push_range(repo, walk, curr, hide)))
 138                                 return error;
 139                 } else {
 140                         if (push_spec(repo, walk, curr, hide) == 0)
 141                                 continue;
 142
 143                         if ((error = git_oid_fromstr(&oid, curr)))
 144                                 return error;
 145                         if ((error = push_commit(walk, &oid, hide)))
 146                                 return error;
 147                 }
 148         }
 149
 150         return 0;
 151 }
 152