logmeow/config.cpp

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#include <cstdlib>
#include <cstring>
#include <sys/stat.h>
#include <string>
#include <nlohmann/json.hpp>
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#include "log.h"
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#include "misc.h"
#include "config.h"
static FILE* fopen_or_raise(const char* path, const char* mode, bool ignore_enoent) {
FILE* file = fopen(path, mode);
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if (!file && !(ignore_enoent && errno == ENOENT)) {
throw_system_error(std::string("fopen(") + quote(path) + ')');
}
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return file;
}
static void fclose_and_log(FILE* file) {
if (!fclose(file)) {
return;
}
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log(std::string("Failed to close a file: fclose(): ") + strerror(errno));
}
std::string get_config_folder() {
const char* path;
path = getenv("XDG_CONFIG_HOME");
if (path) {
return std::string(path) + "/logmeow";
}
path = getenv("HOME");
if (path) {
return std::string(path) + "/.config/logmeow";
}
throw std::runtime_error("cannot find suitable config folder, please set XDG_CONFIG_HOME or HOME");
}
std::string get_config_file_path() {
return get_config_folder() + "/config.json";
}
// tries to create a directory with an empty string if it's just "/" but who cares
void create_config_folders_if_necessary() {
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std::string full_path = get_config_folder();
std::string path;
size_t pos = 0;
while (pos != std::string::npos) {
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pos = full_path.find('/', pos);
if (pos != std::string::npos) {
pos++;
}
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path = full_path.substr(0, pos);
if (!mkdir(path.c_str(), 0600)) {
continue;
}
if (errno == EEXIST) {
continue;
}
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throw_system_error(std::string("mkdir(") + quote(path) + ')');
}
}
void from_json(const nlohmann::json& j, Config& config) {
j.at("logcat_command").get_to(config.logcat_command);
j.at("normal_font_size").get_to(config.normal_font_size);
j.at("monospace_font_size").get_to(config.monospace_font_size);
j.at("filters").get_to(config.filters);
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j.at("exclusions").get_to(config.exclusions);
}
Config load_config() {
std::string config_file_path = get_config_file_path();
std::unique_ptr<FILE, decltype(&fclose_and_log)> config_file(fopen_or_raise(config_file_path.c_str(), "r", true), fclose_and_log);
if (!config_file) {
return Config();
}
return nlohmann::json::parse(config_file.get()).get<Config>();
}
void to_json(nlohmann::json& j, const Config& config) {
j["logcat_command"] = config.logcat_command;
j["normal_font_size"] = config.normal_font_size;
j["monospace_font_size"] = config.monospace_font_size;
j["filters"] = config.filters;
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j["exclusions"] = config.exclusions;
}
void write_config(const Config& config) {
std::string config_file_path = get_config_file_path();
std::string tmp_config_file_path = config_file_path + ".tmp";
std::unique_ptr<FILE, decltype(&fclose_and_log)> config_file(fopen_or_raise(tmp_config_file_path.c_str(), "w", false), fclose_and_log);
nlohmann::json json_config = config;
std::string str_config = json_config.dump();
fwrite(str_config.data(), sizeof(char), str_config.size(), config_file.get());
config_file.reset();
if (!rename(tmp_config_file_path.c_str(), config_file_path.c_str())) {
return;
}
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throw_system_error(std::string("rename(") + quote(tmp_config_file_path) + ", " + quote(config_file_path) + ')');
}