added config

backend/config.go

@@ -0,0 +1,77 @@
+package backend
+
+import (
+	"fmt"
+	"os"
+	"path"
+
+	"github.com/BurntSushi/toml"
+)
+
+type Config struct {
+	LibraryDirPath string
+	MyConfigValue  string
+}
+
+var defaultConfig *Config = &Config{
+	LibraryDirPath: "",
+	MyConfigValue:  "testtesttest",
+}
+
+func GetConfig() (*Config, error) {
+
+	configDir, err := GetUserConfigDirPath()
+	if err != nil {
+		return nil, fmt.Errorf("could not get user config directory path: %w", err)
+	}
+	configFilePath := path.Join(configDir, "config.toml")
+	// create the config file and load defaults if it doesn't exist
+	_, err = os.Stat(configFilePath)
+	if os.IsNotExist(err) {
+		defaultConfig.WriteConfig(configFilePath)
+	}
+	conf, err := LoadConfig(configFilePath)
+	if err != nil {
+		return nil, fmt.Errorf("could not load config file %s: %w", configFilePath, err)
+	}
+	return conf, nil
+}
+
+func LoadConfig(configFilePath string) (*Config, error) {
+	// read in the file
+	confFileData, err := os.ReadFile(configFilePath)
+	if err != nil {
+		return nil, fmt.Errorf("problem reading config file %s: %w", configFilePath, err)
+	}
+
+	// parse it into the config struct
+	var conf Config
+	_, err = toml.Decode(string(confFileData), &conf)
+	if err != nil {
+		return nil, fmt.Errorf("problem parsing config file %s: %w", configFilePath, err)
+	}
+
+	// validate the config
+	if err = conf.validate(); err != nil {
+		return nil, fmt.Errorf("invalid config file at %s: %w", configFilePath, err)
+	}
+
+	return &conf, nil
+}
+
+func (c *Config) WriteConfig(configFileWritePath string) error {
+	confFileData, err := toml.Marshal(c)
+	if err != nil {
+		return fmt.Errorf("could not marshal config struct: %w", err)
+	}
+	err = os.WriteFile(configFileWritePath, confFileData, os.FileMode(int(0666)))
+	if err != nil {
+		return fmt.Errorf("could not write config file: %w", err)
+	}
+	return nil
+}
+
+// return errors if there is a *breaking* issue with the config
+func (c *Config) validate() error {
+	return nil
+}