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// Copyright (C) 2015 Thomas Voß <thomas.voss.bochum@gmail.com>
//
// This library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 Lesser General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <xdg.h>
#include <boost/algorithm/string.hpp>
#include <cstdlib>
#include <stdexcept>
namespace fs = boost::filesystem;
namespace
{
fs::path throw_if_not_absolute(const fs::path& p)
{
if (p.has_root_directory())
return p;
throw std::runtime_error{"Directories MUST be absolute."};
}
namespace env
{
std::string get(const std::string& key, const std::string& default_value)
{
if (auto value = std::getenv(key.c_str()))
return value;
return default_value;
}
std::string get_or_throw(const std::string& key)
{
if (auto value = std::getenv(key.c_str()))
{
return value;
}
throw std::runtime_error{key + " not set in environment"};
}
constexpr const char* xdg_data_home{"XDG_DATA_HOME"};
constexpr const char* xdg_data_dirs{"XDG_DATA_DIRS"};
constexpr const char* xdg_config_home{"XDG_CONFIG_HOME"};
constexpr const char* xdg_config_dirs{"XDG_CONFIG_DIRS"};
constexpr const char* xdg_cache_home{"XDG_CACHE_HOME"};
}
namespace impl
{
class BaseDirSpecification : public xdg::BaseDirSpecification
{
public:
static const BaseDirSpecification& instance()
{
static const BaseDirSpecification spec;
return spec;
}
BaseDirSpecification()
{
}
const xdg::Data& data() const override
{
return data_;
}
const xdg::Config& config() const override
{
return config_;
}
const xdg::Cache& cache() const override
{
return cache_;
}
const xdg::Runtime& runtime() const override
{
return runtime_;
}
private:
xdg::Data data_;
xdg::Config config_;
xdg::Cache cache_;
xdg::Runtime runtime_;
};
}
}
fs::path xdg::Data::home() const
{
auto v = env::get(env::xdg_data_home, "");
if (v.empty())
return throw_if_not_absolute(fs::path{env::get_or_throw("HOME")} / ".local" / "share");
return throw_if_not_absolute(fs::path(v));
}
std::vector<fs::path> xdg::Data::dirs() const
{
auto v = env::get(env::xdg_data_dirs, "");
if (v.empty())
return {fs::path{"/usr/local/share"}, fs::path{"/usr/share"}};
std::vector<std::string> tokens;
tokens = boost::split(tokens, v, boost::is_any_of(":"));
std::vector<fs::path> result;
for (const auto& token : tokens)
{
result.push_back(throw_if_not_absolute(fs::path(token)));
}
return result;
}
fs::path xdg::Config::home() const
{
auto v = env::get(env::xdg_config_home, "");
if (v.empty())
return throw_if_not_absolute(fs::path{env::get_or_throw("HOME")} / ".config");
return throw_if_not_absolute(fs::path(v));
}
std::vector<fs::path> xdg::Config::dirs() const
{
auto v = env::get(env::xdg_config_dirs, "");
if (v.empty())
return {fs::path{"/etc/xdg"}};
std::vector<std::string> tokens;
tokens = boost::split(tokens, v, boost::is_any_of(":"));
std::vector<fs::path> result;
for (const auto& token : tokens)
{
fs::path p(token);
result.push_back(throw_if_not_absolute(p));
}
return result;
}
fs::path xdg::Cache::home() const
{
auto v = env::get(env::xdg_cache_home, "");
if (v.empty())
return throw_if_not_absolute(fs::path{env::get_or_throw("HOME")} / ".cache");
return throw_if_not_absolute(fs::path(v));
}
fs::path xdg::Runtime::dir() const
{
auto v = env::get(env::xdg_config_home, "");
if (v.empty())
{
// We do not fall back gracefully and instead throw, dispatching to calling
// code for handling the case of a safe user-specfic runtime directory missing.
throw std::runtime_error{"Runtime directory not set"};
}
return throw_if_not_absolute(fs::path(v));
}
std::shared_ptr<xdg::BaseDirSpecification> xdg::BaseDirSpecification::create()
{
return std::make_shared<impl::BaseDirSpecification>();
}
const xdg::Data& xdg::data()
{
return impl::BaseDirSpecification::instance().data();
}
const xdg::Config& xdg::config()
{
return impl::BaseDirSpecification::instance().config();
}
const xdg::Cache& xdg::cache()
{
return impl::BaseDirSpecification::instance().cache();
}
const xdg::Runtime& xdg::runtime()
{
return impl::BaseDirSpecification::instance().runtime();
}
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