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// -*- mode: c++; c-basic-offset: 2; -*-
#include "common.hh"
#include "config.hh"
#include "paths.hh"
#include "strings.hh"
#include "xdg.hh"
#include <cstring>
#include <fstream>
#include <sstream>
#include <unordered_map>
namespace {
class ConfigImpl : public Config {
public:
ConfigImpl()
: good_(true) {
}
bool load_name(std::string const& name) override {
name_ = name;
auto dirs = XDG::config_dirs();
bool good = true;
std::string error;
std::unordered_map<std::string,std::string> data;
for (auto& dir : dirs) {
std::string tmp_error;
std::unordered_map<std::string,std::string> tmp_data;
if (load_file(Paths::join(dir, name_), &tmp_data, &tmp_error, false)) {
data.insert(tmp_data.begin(), tmp_data.end());
} else {
if (good) {
// We want the most import error
error = tmp_error;
good = false;
}
}
}
return update(good, error, data);
}
bool load_file(std::string const& filename) override {
std::string error;
std::unordered_map<std::string,std::string> data;
bool good = load_file(filename, &data, &error, true);
return update(good, error, data);
}
bool good() const override {
return good_;
}
std::string const& last_error() const override {
return last_error_;
}
std::string const& get(std::string const& key,
std::string const& fallback) override {
auto i = override_.find(key);
if (i != override_.end()) return i->second;
i = data_.find(key);
if (i != data_.end()) return i->second;
return fallback;
}
char const* get(std::string const& key, char const* fallback) override {
auto i = override_.find(key);
if (i != override_.end()) return i->second.c_str();
i = data_.find(key);
if (i != data_.end()) return i->second.c_str();
return fallback;
}
bool is_set(std::string const& key) override {
return override_.count(key) > 0 || data_.count(key) > 0;
}
bool get(std::string const& key, bool fallback) override {
auto ret = get(key, nullptr);
if (!ret) return fallback;
return strcmp(ret, "true") == 0;
}
void set(std::string const& key, std::string const& value) override {
auto ret = override_.insert(std::make_pair(key, value));
if (!ret.second) {
ret.first->second = value;
}
}
void remove(std::string const& key) override {
override_.erase(key);
}
private:
bool update(bool good, std::string const& last_error,
std::unordered_map<std::string, std::string>& data) {
good_ = good;
if (!good_) {
last_error_ = last_error;
} else {
data_.clear();
data_.swap(data);
}
return good_;
}
static bool load_file(std::string const& filename,
std::unordered_map<std::string, std::string>* data,
std::string* error, bool should_exist) {
bool good = true;
data->clear();
error->clear();
std::ifstream in(filename);
if (!in) {
if (should_exist) {
std::stringstream ss;
ss << "Unable to read: " << filename;
*error = ss.str();
good = false;
}
return good;
}
std::string line;
uint32_t count = 0;
std::string key, value;
while (std::getline(in, line)) {
count++;
if (line.empty() || line[0] == '#') continue;
auto idx = line.find('=');
if (idx == 0 || idx == std::string::npos) {
std::stringstream ss;
if (idx == 0) {
ss << filename << ':' << count << ": Invalid line, starts with '='";
} else {
ss << filename << ':' << count << ": Invalid line, no '=' found";
}
*error = ss.str();
good = false;
break;
}
size_t start = 0, end = idx;
key.assign(Strings::trim(line, start, end));
if (data->count(key) > 0) {
std::stringstream ss;
ss << filename << ':' << count << ": '" << key << "' is already set";
*error = ss.str();
good = false;
break;
}
start = idx + 1;
end = line.size();
Strings::trim(line, &start, &end);
if (line[start] == '"' && line[end - 1] == '"') {
value.assign(Strings::unquote(line, start, end));
} else {
value.assign(line.substr(start, end - start));
}
(*data)[key] = value;
}
if (good && in.bad()) {
std::stringstream ss;
ss << filename << ": I/O error: " << strerror(errno);
*error = ss.str();
good = false;
}
if (!good) data->clear();
return good;
}
bool good_;
std::string name_;
std::string last_error_;
std::unordered_map<std::string, std::string> data_;
std::unordered_map<std::string, std::string> override_;
};
} // namespace
// static
Config* Config::create() {
return new ConfigImpl();
}
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