src/repo.c

   1 /* Copyright (c) 2006-2014 Jonas Fonseca <jonas.fonseca@gmail.com>
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU General Public License as
   5  * published by the Free Software Foundation; either version 2 of
   6  * the License, or (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include "tig/tig.h"
  15 #include "tig/repo.h"
  16 #include "tig/io.h"
  17 #include "tig/refdb.h"
  18
  19 #define REPO_INFO_GIT_DIR       "--git-dir"
  20 #define REPO_INFO_WORK_TREE     "--is-inside-work-tree"
  21 #define REPO_INFO_SHOW_CDUP     "--show-cdup"
  22 #define REPO_INFO_SHOW_PREFIX   "--show-prefix"
  23 #define REPO_INFO_SYMBOLIC_HEAD "--symbolic-full-name"
  24 #define REPO_INFO_RESOLVED_HEAD "HEAD"
  25
  26 struct repo_info_state {
  27         const char **argv;
  28         char head_id[SIZEOF_REV];
  29 };
  30
  31 static int
  32 read_repo_info(char *name, size_t namelen, char *value, size_t valuelen, void *data)
  33 {
  34         struct repo_info_state *state = data;
  35         const char *arg = *state->argv ? *state->argv++ : "";
  36
  37         if (!strcmp(arg, REPO_INFO_GIT_DIR)) {
  38                 string_ncopy(repo.git_dir, name, namelen);
  39
  40         } else if (!strcmp(arg, REPO_INFO_WORK_TREE)) {
  41                 /* This can be 3 different values depending on the
  42                  * version of git being used. If git-rev-parse does not
  43                  * understand --is-inside-work-tree it will simply echo
  44                  * the option else either "true" or "false" is printed.
  45                  * Default to true for the unknown case. */
  46                 repo.is_inside_work_tree = strcmp(name, "false") ? TRUE : FALSE;
  47
  48         } else if (!strcmp(arg, REPO_INFO_SHOW_CDUP)) {
  49                 string_ncopy(repo.cdup, name, namelen);
  50
  51         } else if (!strcmp(arg, REPO_INFO_SHOW_PREFIX)) {
  52                 /* Some versions of Git does not emit anything for --show-prefix
  53                  * when the user is in the repository root directory. Try to detect
  54                  * this special case by looking at the emitted value. If it looks
  55                  * like a commit ID and there's no cdup path assume that no value
  56                  * was emitted. */
  57                 if (!*repo.cdup && namelen == 40 && iscommit(name))
  58                         return read_repo_info(name, namelen, value, valuelen, data);
  59
  60                 string_ncopy(repo.prefix, name, namelen);
  61
  62         } else if (!strcmp(arg, REPO_INFO_RESOLVED_HEAD)) {
  63                 string_ncopy(state->head_id, name, namelen);
  64
  65         } else if (!strcmp(arg, REPO_INFO_SYMBOLIC_HEAD)) {
  66                 if (!prefixcmp(name, "refs/heads/")) {
  67                         char *offset = name + STRING_SIZE("refs/heads/");
  68
  69                         string_ncopy(repo.head, offset, strlen(offset) + 1);
  70                         add_ref(state->head_id, name, repo.remote, repo.head);
  71                 }
  72                 state->argv++;
  73         }
  74
  75         return OK;
  76 }
  77
  78 int
  79 load_repo_info(void)
  80 {
  81         const char *rev_parse_argv[] = {
  82                 "git", "rev-parse", REPO_INFO_GIT_DIR, REPO_INFO_WORK_TREE,
  83                         REPO_INFO_SHOW_CDUP, REPO_INFO_SHOW_PREFIX, \
  84                         REPO_INFO_RESOLVED_HEAD, REPO_INFO_SYMBOLIC_HEAD, "HEAD",
  85                         NULL
  86         };
  87         struct repo_info_state state = { rev_parse_argv + 2 };
  88
  89         return io_run_load(rev_parse_argv, "=", read_repo_info, &state);
  90 }
  91
  92 struct repo_info repo;
  93
  94 /* vim: set ts=8 sw=8 noexpandtab: */