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#include "cfg.hh"
#include "io.hh"
#include "line.hh"
#include "paths.hh"
#include "str.hh"
#include <charconv>
#include <cstdint>
#include <format>
#include <functional>
#include <map>
#include <memory>
#include <optional>
#include <string>
#include <string_view>
#include <system_error>
#include <utility>
#include <vector>
namespace cfg {
namespace {
inline char ascii_lowercase(char c) {
if (c >= 'A' && c <= 'Z') {
// NOLINTNEXTLINE(bugprone-narrowing-conversions)
return c | 0x20;
}
return c;
}
bool ascii_lowercase_eq(std::string_view a, std::string_view b) {
if (a.size() != b.size())
return false;
auto it_a = a.begin();
auto it_b = b.begin();
for (; it_a != a.end(); ++it_a, ++it_b) {
if (ascii_lowercase(*it_a) != *it_b)
return false;
}
return true;
}
class ConfigSingleImpl : public Config {
public:
ConfigSingleImpl() = default;
bool load(std::filesystem::path const& path,
std::vector<std::string>& errors) {
auto io_reader = io::open(std::string(path));
if (!io_reader.has_value()) {
errors.push_back(
std::format("Unable to open {} for reading", path.string()));
return false;
}
bool all_ok = true;
auto line_reader = line::open(std::move(io_reader.value()));
while (true) {
auto line = line_reader->read();
if (line.has_value()) {
auto trimmed = str::trim(line.value());
if (trimmed.empty() || trimmed.front() == '#')
continue;
auto eq = trimmed.find('=');
if (eq == std::string_view::npos) {
errors.push_back(
std::format("{}:{}: Invalid line, expected key = value.",
path.string(), line_reader->number()));
all_ok = false;
continue;
}
auto key = str::trim(trimmed.substr(0, eq));
auto value = str::trim(trimmed.substr(eq + 1));
auto ret = values_.emplace(key, value);
if (!ret.second) {
errors.push_back(std::format("{}:{}: Duplicate key {} ignored.",
path.string(), line_reader->number(),
key));
all_ok = false;
continue;
}
} else {
switch (line.error()) {
case io::ReadError::Eof:
break;
default:
errors.push_back(std::format("{}: Read error", path.string()));
all_ok = false;
break;
}
break;
}
}
return all_ok;
}
[[nodiscard]]
std::optional<std::string_view> get(std::string_view name) const override {
auto it = values_.find(name);
if (it == values_.end())
return std::nullopt;
return it->second;
}
private:
std::map<std::string, std::string, std::less<>> values_;
};
class ConfigXdgImpl : public Config {
public:
ConfigXdgImpl() = default;
bool load(std::string_view name, std::vector<std::string>& errors) {
bool all_ok = true;
for (auto const& dir : paths::config_dirs()) {
auto file = dir / name;
if (std::filesystem::exists(file)) {
auto cfg = std::make_unique<ConfigSingleImpl>();
if (!cfg->load(file, errors))
all_ok = false;
configs_.push_back(std::move(cfg));
}
}
return all_ok;
}
[[nodiscard]]
std::optional<std::string_view> get(std::string_view name) const override {
for (auto const& config : configs_) {
auto ret = config->get(name);
if (ret.has_value())
return ret;
}
return std::nullopt;
}
private:
std::vector<std::unique_ptr<ConfigSingleImpl>> configs_;
};
} // namespace
bool Config::has(std::string_view name) const { return get(name).has_value(); }
std::optional<int64_t> Config::get_int64(std::string_view name) const {
auto str = get(name);
if (str.has_value()) {
auto* const end = str->data() + str->size();
int64_t ret;
// NOLINTNEXTLINE(bugprone-suspicious-stringview-data-usage)
auto [ptr, ec] = std::from_chars(str->data(), end, ret);
if (ec == std::errc() && ptr == end)
return ret;
}
return std::nullopt;
}
std::optional<uint64_t> Config::get_uint64(std::string_view name) const {
auto str = get(name);
if (str.has_value()) {
auto* const end = str->data() + str->size();
uint64_t ret;
// NOLINTNEXTLINE(bugprone-suspicious-stringview-data-usage)
auto [ptr, ec] = std::from_chars(str->data(), end, ret);
if (ec == std::errc() && ptr == end)
return ret;
}
return std::nullopt;
}
std::optional<bool> Config::get_bool(std::string_view name) const {
auto str = get(name);
if (str.has_value()) {
if (ascii_lowercase_eq(str.value(), "true") ||
ascii_lowercase_eq(str.value(), "yes"))
return true;
if (ascii_lowercase_eq(str.value(), "false") ||
ascii_lowercase_eq(str.value(), "no"))
return false;
}
return std::nullopt;
}
std::unique_ptr<Config> load_all(std::string_view name,
std::vector<std::string>& errors) {
auto ret = std::make_unique<ConfigXdgImpl>();
ret->load(name, errors);
return ret;
}
std::unique_ptr<Config> load_one(std::filesystem::path const& path,
std::vector<std::string>& errors) {
auto ret = std::make_unique<ConfigSingleImpl>();
ret->load(path, errors);
return ret;
}
} // namespace cfg
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