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// Copyright 2019 Roman Perepelitsa.
//
// This file is part of GitStatus.
//
// GitStatus is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GitStatus is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
#include "git.h"
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <sstream>
#include <utility>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "arena.h"
#include "check.h"
#include "print.h"
#include "scope_guard.h"
namespace gitstatus {
const char* GitError() {
const git_error* err = git_error_last();
return err && err->message ? err->message : "unknown error";
}
std::string RepoState(git_repository* repo) {
Arena arena;
StringView gitdir(git_repository_path(repo));
// These names mostly match gitaction in vcs_info:
// https://github.com/zsh-users/zsh/blob/master/Functions/VCS_Info/Backends/VCS_INFO_get_data_git.
auto State = [&]() {
switch (git_repository_state(repo)) {
case GIT_REPOSITORY_STATE_NONE:
return "";
case GIT_REPOSITORY_STATE_MERGE:
return "merge";
case GIT_REPOSITORY_STATE_REVERT:
return "revert";
case GIT_REPOSITORY_STATE_REVERT_SEQUENCE:
return "revert-seq";
case GIT_REPOSITORY_STATE_CHERRYPICK:
return "cherry";
case GIT_REPOSITORY_STATE_CHERRYPICK_SEQUENCE:
return "cherry-seq";
case GIT_REPOSITORY_STATE_BISECT:
return "bisect";
case GIT_REPOSITORY_STATE_REBASE:
return "rebase";
case GIT_REPOSITORY_STATE_REBASE_INTERACTIVE:
return "rebase-i";
case GIT_REPOSITORY_STATE_REBASE_MERGE:
return "rebase-m";
case GIT_REPOSITORY_STATE_APPLY_MAILBOX:
return "am";
case GIT_REPOSITORY_STATE_APPLY_MAILBOX_OR_REBASE:
return "am/rebase";
}
return "action";
};
auto DirExists = [&](StringView name) {
int fd = open(arena.StrCat(gitdir, "/", name), O_DIRECTORY | O_CLOEXEC);
if (fd < 0) return false;
CHECK(!close(fd)) << Errno();
return true;
};
auto ReadFile = [&](StringView name) {
std::ifstream strm(arena.StrCat(gitdir, "/", name));
std::string res;
strm >> res;
return res;
};
std::string next;
std::string last;
if (DirExists("rebase-merge")) {
next = ReadFile("rebase-merge/msgnum");
last = ReadFile("rebase-merge/end");
} else if (DirExists("rebase-apply")) {
next = ReadFile("rebase-apply/next");
last = ReadFile("rebase-apply/last");
}
std::ostringstream res;
res << State();
if (!next.empty() && !last.empty()) res << ' ' << next << '/' << last;
return res.str();
}
size_t CountRange(git_repository* repo, const std::string& range) {
git_revwalk* walk = nullptr;
VERIFY(!git_revwalk_new(&walk, repo)) << GitError();
ON_SCOPE_EXIT(=) { git_revwalk_free(walk); };
VERIFY(!git_revwalk_push_range(walk, range.c_str())) << GitError();
size_t res = 0;
while (true) {
git_oid oid;
switch (git_revwalk_next(&oid, walk)) {
case 0:
++res;
break;
case GIT_ITEROVER:
return res;
default:
LOG(ERROR) << "git_revwalk_next: " << range << ": " << GitError();
throw Exception();
}
}
}
size_t NumStashes(git_repository* repo) {
size_t res = 0;
auto* cb = +[](size_t index, const char* message, const git_oid* stash_id, void* payload) {
++*static_cast<size_t*>(payload);
return 0;
};
if (!git_stash_foreach(repo, cb, &res)) return res;
// Example error: failed to parse signature - malformed e-mail.
// See https://github.com/romkatv/powerlevel10k/issues/216.
LOG(WARN) << "git_stash_foreach: " << GitError();
return 0;
}
git_reference* Head(git_repository* repo) {
git_reference* symbolic = nullptr;
switch (git_reference_lookup(&symbolic, repo, "HEAD")) {
case 0:
break;
case GIT_ENOTFOUND:
return nullptr;
default:
LOG(ERROR) << "git_reference_lookup: " << GitError();
throw Exception();
}
git_reference* direct = nullptr;
if (git_reference_resolve(&direct, symbolic)) {
LOG(INFO) << "Empty git repo (no HEAD)";
return symbolic;
}
git_reference_free(symbolic);
return direct;
}
const char* LocalBranchName(const git_reference* ref) {
CHECK(ref);
git_reference_t type = git_reference_type(ref);
switch (type) {
case GIT_REFERENCE_DIRECT: {
return git_reference_is_branch(ref) ? git_reference_shorthand(ref) : "";
}
case GIT_REFERENCE_SYMBOLIC: {
static constexpr char kHeadPrefix[] = "refs/heads/";
const char* target = git_reference_symbolic_target(ref);
if (!target) return "";
size_t len = std::strlen(target);
if (len < sizeof(kHeadPrefix)) return "";
if (std::memcmp(target, kHeadPrefix, sizeof(kHeadPrefix) - 1)) return "";
return target + (sizeof(kHeadPrefix) - 1);
}
case GIT_REFERENCE_INVALID:
case GIT_REFERENCE_ALL:
break;
}
LOG(ERROR) << "Invalid reference type: " << type;
throw Exception();
}
RemotePtr GetRemote(git_repository* repo, const git_reference* local) {
git_remote* remote;
git_buf symref = {};
if (git_branch_remote(&remote, &symref, repo, git_reference_name(local))) return nullptr;
ON_SCOPE_EXIT(&) {
git_remote_free(remote);
git_buf_free(&symref);
};
git_reference* ref;
if (git_reference_lookup(&ref, repo, symref.ptr)) return nullptr;
ON_SCOPE_EXIT(&) { if (ref) git_reference_free(ref); };
const char* branch = nullptr;
std::string name = remote ? git_remote_name(remote) : ".";
if (git_branch_name(&branch, ref)) {
branch = "";
} else if (remote) {
VERIFY(std::strstr(branch, name.c_str()) == branch);
VERIFY(branch[name.size()] == '/');
branch += name.size() + 1;
}
auto res = std::make_unique<Remote>();
res->name = std::move(name);
res->branch = branch;
res->url = remote ? (git_remote_url(remote) ?: "") : "";
res->ref = std::exchange(ref, nullptr);
return RemotePtr(res.release());
}
PushRemotePtr GetPushRemote(git_repository* repo, const git_reference* local) {
git_remote* remote;
git_buf symref = {};
if (git_branch_push_remote(&remote, &symref, repo, git_reference_name(local))) return nullptr;
ON_SCOPE_EXIT(&) {
git_remote_free(remote);
git_buf_free(&symref);
};
git_reference* ref;
if (git_reference_lookup(&ref, repo, symref.ptr)) return nullptr;
ON_SCOPE_EXIT(&) { if (ref) git_reference_free(ref); };
std::string name = remote ? git_remote_name(remote) : ".";
auto res = std::make_unique<PushRemote>();
res->name = std::move(name);
res->url = remote ? (git_remote_url(remote) ?: "") : "";
res->ref = std::exchange(ref, nullptr);
return PushRemotePtr(res.release());
}
CommitMessage GetCommitMessage(git_repository* repo, const git_oid& id) {
git_commit* commit;
VERIFY(!git_commit_lookup(&commit, repo, &id)) << GitError();
ON_SCOPE_EXIT(=) { git_commit_free(commit); };
return {.encoding = git_commit_message_encoding(commit) ?: "",
.summary = git_commit_summary(commit) ?: ""};
}
} // namespace gitstatus
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