/**
* Get the tree pointed to by a commit
*
* @param commit S4 class git_commit or git_stash
* @return S4 class git_tree
*/
SEXP git2r_commit_tree(SEXP commit)
{
int err;
SEXP result = R_NilValue;
SEXP repo;
git_commit *commit_obj = NULL;
git_repository *repository = NULL;
git_tree *tree = NULL;
if (git2r_arg_check_commit(commit))
git2r_error(git2r_err_commit_arg, __func__, "commit");
repo = GET_SLOT(commit, Rf_install("repo"));
repository = git2r_repository_open(repo);
if (!repository)
git2r_error(git2r_err_invalid_repository, __func__, NULL);
err = git2r_commit_lookup(&commit_obj, repository, commit);
if (GIT_OK != err)
goto cleanup;
err = git_commit_tree(&tree, commit_obj);
if (GIT_OK != err)
goto cleanup;
PROTECT(result = NEW_OBJECT(MAKE_CLASS("git_tree")));
git2r_tree_init((git_tree*)tree, repo, result);
cleanup:
if (commit_obj)
git_commit_free(commit_obj);
if (tree)
git_tree_free(tree);
if (repository)
git_repository_free(repository);
if (R_NilValue != result)
UNPROTECT(1);
if (GIT_OK != err)
git2r_error(git2r_err_from_libgit2, __func__, giterr_last()->message);
return result;
}
/**
* Lookup an object in a repository
*
* @param repo S4 class git_repository
* @param hex 4 to 40 char hexadecimal string
* @return S4 object with lookup
*/
SEXP git2r_object_lookup(SEXP repo, SEXP hex)
{
int err;
size_t len;
SEXP result = R_NilValue;
git_object *object = NULL;
git_oid oid;
git_repository *repository = NULL;
if (git2r_error_check_hex_arg(hex))
error("Invalid arguments to git2r_object_lookup");
repository = git2r_repository_open(repo);
if (!repository)
error(git2r_err_invalid_repository);
len = LENGTH(STRING_ELT(hex, 0));
if (GIT_OID_HEXSZ == len) {
git_oid_fromstr(&oid, CHAR(STRING_ELT(hex, 0)));
err = git_object_lookup(&object, repository, &oid, GIT_OBJ_ANY);
if (err < 0)
goto cleanup;
} else {
git_oid_fromstrn(&oid, CHAR(STRING_ELT(hex, 0)), len);
err = git_object_lookup_prefix(&object, repository, &oid, len, GIT_OBJ_ANY);
if (err < 0)
goto cleanup;
}
switch (git_object_type(object)) {
case GIT_OBJ_COMMIT:
PROTECT(result = NEW_OBJECT(MAKE_CLASS("git_commit")));
git2r_commit_init((git_commit*)object, repo, result);
break;
case GIT_OBJ_TREE:
PROTECT(result = NEW_OBJECT(MAKE_CLASS("git_tree")));
git2r_tree_init((git_tree*)object, repo, result);
break;
case GIT_OBJ_BLOB:
PROTECT(result = NEW_OBJECT(MAKE_CLASS("git_blob")));
git2r_blob_init((git_blob*)object, repo, result);
break;
case GIT_OBJ_TAG:
PROTECT(result = NEW_OBJECT(MAKE_CLASS("git_tag")));
git2r_tag_init((git_tag*)object, repo, result);
break;
default:
error("Unimplemented");
}
cleanup:
if (object)
git_object_free(object);
if (repository)
git_repository_free(repository);
if (R_NilValue != result)
UNPROTECT(1);
if (err < 0)
error("Error: %s\n", giterr_last()->message);
return result;
}
/**
* Invoked 'callback' for each tag
*
* @param name The name of the tag
* @param oid The id of the tag
* @param payload Payload data passed to 'git_tag_foreach'
* @return 0 on success, else error code
*/
static int git2r_tag_foreach_cb(const char *name, git_oid *oid, void *payload)
{
int err = 0;
git_object *object = NULL;
git2r_tag_foreach_cb_data *cb_data = (git2r_tag_foreach_cb_data*)payload;
/* Check if we have a list to populate */
if (R_NilValue != cb_data->tags) {
int skip = 0;
SEXP item;
err = git_object_lookup(&object, cb_data->repository, oid, GIT_OBJ_ANY);
if (err)
goto cleanup;
switch (git_object_type(object)) {
case GIT_OBJ_COMMIT:
SET_VECTOR_ELT(
cb_data->tags,
cb_data->n,
item = NEW_OBJECT(MAKE_CLASS("git_commit")));
git2r_commit_init((git_commit*)object, cb_data->repo, item);
break;
case GIT_OBJ_TREE:
SET_VECTOR_ELT(
cb_data->tags,
cb_data->n,
item = NEW_OBJECT(MAKE_CLASS("git_tree")));
git2r_tree_init((git_tree*)object, cb_data->repo, item);
break;
case GIT_OBJ_BLOB:
SET_VECTOR_ELT(
cb_data->tags,
cb_data->n,
item = NEW_OBJECT(MAKE_CLASS("git_blob")));
git2r_blob_init((git_blob*)object, cb_data->repo, item);
break;
case GIT_OBJ_TAG:
SET_VECTOR_ELT(
cb_data->tags,
cb_data->n,
item = NEW_OBJECT(MAKE_CLASS("git_tag")));
git2r_tag_init((git_tag*)object, cb_data->repo, item);
break;
default:
git2r_error(__func__, NULL, git2r_err_object_type, NULL);
}
if (git__prefixcmp(name, "refs/tags/") == 0)
skip = strlen("refs/tags/");
SET_STRING_ELT(
getAttrib(cb_data->tags, R_NamesSymbol),
cb_data->n,
mkChar(name + skip));
if (object)
git_object_free(object);
object = NULL;
}
cb_data->n += 1;
cleanup:
if (object)
git_object_free(object);
return err;
}
/**
* Find object specified by revision
*
* @param repo S4 class git_repository
* @param revision The revision string, see
* http://git-scm.com/docs/git-rev-parse.html#_specifying_revisions
* @return S4 object of class git_commit, git_tag or git_tree.
*/
SEXP git2r_revparse_single(SEXP repo, SEXP revision)
{
int err;
SEXP result = R_NilValue;
git_repository *repository = NULL;
git_object *treeish = NULL;
if (git2r_arg_check_string(revision))
git2r_error(git2r_err_string_arg, __func__, "revision");
repository = git2r_repository_open(repo);
if (!repository)
git2r_error(git2r_err_invalid_repository, __func__, NULL);
err = git_revparse_single(
&treeish,
repository,
CHAR(STRING_ELT(revision, 0)));
if (GIT_OK != err)
goto cleanup;
switch (git_object_type(treeish)) {
case GIT_OBJ_COMMIT:
PROTECT(result = NEW_OBJECT(MAKE_CLASS("git_commit")));
git2r_commit_init((git_commit*)treeish, repo, result);
break;
case GIT_OBJ_TAG:
PROTECT(result = NEW_OBJECT(MAKE_CLASS("git_tag")));
git2r_tag_init((git_tag*)treeish, repo, result);
break;
case GIT_OBJ_TREE:
PROTECT(result = NEW_OBJECT(MAKE_CLASS("git_tree")));
git2r_tree_init((git_tree*)treeish, repo, result);
break;
default:
giterr_set_str(GITERR_NONE, git2r_err_revparse_single);
err = GIT_ERROR;
break;
}
cleanup:
if (treeish)
git_object_free(treeish);
if (repository)
git_repository_free(repository);
if (R_NilValue != result)
UNPROTECT(1);
if (GIT_OK != err) {
if (GIT_ENOTFOUND == err) {
git2r_error(
git2r_err_from_libgit2,
__func__,
"Requested object could not be found");
} else {
git2r_error(
git2r_err_from_libgit2,
__func__,
giterr_last()->message);
}
}
return result;
}