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// file : libbutl/git.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2018 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef __cpp_modules
#include <libbutl/git.mxx>
#endif
// C includes.
#include <cassert>
#ifndef __cpp_lib_modules
#include <string>
#include <cstddef> // size_t
#endif
// Other includes.
#ifdef __cpp_modules
module butl.git;
// Only imports additional to interface.
#ifdef __clang__
#ifdef __cpp_lib_modules
import std.core;
#endif
import butl.path;
import butl.optional;
import butl.standard_version
#endif
import butl.utility; // digit()
import butl.filesystem; // entry_exists()
#else
#include <libbutl/utility.mxx>
#include <libbutl/optional.mxx>
#include <libbutl/filesystem.mxx>
#include <libbutl/standard-version.mxx>
#endif
using namespace std;
namespace butl
{
bool
git_repository (const dir_path& d)
{
// .git can be either a directory or a file in case of a submodule or a
// separate working tree.
//
return entry_exists (d / ".git",
true /* follow_symlinks */,
true /* ignore_errors */);
}
optional<standard_version>
git_version (const string& s)
{
// There is some variety across platforms in the version
// representation.
//
// Linux: git version 2.14.3
// MacOS: git version 2.10.1 (Apple Git-78)
// MinGit: git version 2.16.1.windows.1
//
// We will consider the first 3 version components that follows the
// common 'git version ' prefix.
//
const size_t b (12);
if (s.compare (0, b, "git version ") == 0)
{
size_t i (b);
size_t n (0);
for (char c; i != s.size () && (digit (c = s[i]) || c == '.'); ++i)
{
if (c == '.' && ++n == 3)
break;
}
// Returns nullopt if fail to parse.
//
return parse_standard_version (string (s, b, i - b));
}
return nullopt;
}
}
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