128 lines
2.6 KiB
C++
128 lines
2.6 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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#include "Path.hxx"
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#include "Data.hxx"
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#include "fs/AllocatedPath.hxx"
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#include "fs/Traits.hxx"
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#include "fs/XDG.hxx"
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#include "fs/glue/StandardDirectory.hxx"
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#include "lib/fmt/RuntimeError.hxx"
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#include "util/StringSplit.hxx"
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#include <cassert>
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using std::string_view_literals::operator""sv;
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#ifndef _WIN32
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#include <pwd.h>
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static const char *configured_user = nullptr;
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/**
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* Determine a given user's home directory.
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*/
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static AllocatedPath
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GetHome(const char *user)
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{
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AllocatedPath result = GetHomeDir(user);
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if (result.IsNull())
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throw FmtRuntimeError("no such user: {:?}", user);
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return result;
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}
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/**
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* Determine the current user's home directory.
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*/
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static AllocatedPath
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GetHome()
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{
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AllocatedPath result = GetHomeDir();
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if (result.IsNull())
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throw std::runtime_error("problems getting home for current user");
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return result;
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}
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/**
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* Determine the configured user's home directory.
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*
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* Throws #std::runtime_error on error.
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*/
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static AllocatedPath
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GetConfiguredHome()
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{
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return configured_user != nullptr
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? GetHome(configured_user)
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: GetHome();
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}
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#endif
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void
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InitPathParser(const ConfigData &config) noexcept
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{
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#ifdef _WIN32
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(void)config;
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#else
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configured_user = config.GetString(ConfigOption::USER);
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#endif
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}
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AllocatedPath
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ParsePath(const char *path)
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{
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assert(path != nullptr);
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#ifndef _WIN32
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if (path[0] == '~') {
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++path;
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if (*path == '\0')
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return GetConfiguredHome();
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if (*path == '/') {
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++path;
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return GetConfiguredHome() /
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AllocatedPath::FromUTF8Throw(path);
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} else {
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const auto [user, rest] = Split(std::string_view{path}, '/');
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return GetHome(std::string{user}.c_str())
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/ AllocatedPath::FromUTF8Throw(rest);
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}
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#ifdef USE_XDG
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} else if (path[0] == '$') {
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++path;
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const auto [env_var, rest] = Split(std::string_view{path}, '/');
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AllocatedPath xdg_path(nullptr);
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if (env_var == "HOME"sv) {
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xdg_path = GetConfiguredHome();
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} else if (env_var == "XDG_CONFIG_HOME"sv) {
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xdg_path = GetUserConfigDir();
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} else if (env_var == "XDG_MUSIC_DIR"sv) {
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xdg_path = GetUserMusicDir();
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} else if (env_var == "XDG_CACHE_HOME"sv) {
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xdg_path = GetUserCacheDir();
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} else if (env_var == "XDG_RUNTIME_DIR"sv) {
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xdg_path = GetUserRuntimeDir();
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} else {
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throw FmtRuntimeError("Unknown variable: {:?}", env_var);
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}
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return xdg_path / AllocatedPath::FromUTF8Throw(rest);
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#endif
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} else if (!PathTraitsUTF8::IsAbsolute(path)) {
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throw FmtRuntimeError("not an absolute path: {:?}", path);
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} else {
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#endif
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return AllocatedPath::FromUTF8Throw(path);
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#ifndef _WIN32
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}
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#endif
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}
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