Add GTK application implementation

internal/gui/config.go

@@ -0,0 +1,78 @@
+package gui
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+)
+
+type Configuration struct {
+	Host        string `json:"host"`
+	Port        uint64 `json:"port"`
+	Password    string `json:"password"`
+	IsConnected bool   `json:"connected"`
+	Panel       string `json:"panel"`
+	SortField   string `json:"sortField"`
+	SortDesc    bool   `json:"sortDesc"`
+	ItemSize    int    `json:"itemSize"`
+}
+
+func readConfig(config *Configuration) error {
+	filename, filenameErr := getConfigFile()
+	if filenameErr != nil {
+		return filenameErr
+	}
+
+	file, fileErr := os.Open(filename)
+	if fileErr != nil {
+		return fileErr
+	}
+	defer file.Close()
+
+	return json.NewDecoder(file).Decode(config)
+}
+
+func writeConfig(config *Configuration) error {
+	filename, filenameErr := getConfigFile()
+	if filenameErr != nil {
+		return filenameErr
+	}
+
+	file, fileErr := os.Create(filename)
+	if fileErr != nil {
+		return fileErr
+	}
+	defer file.Close()
+
+	encoder := json.NewEncoder(file)
+	encoder.SetIndent("", "\t")
+
+	return encoder.Encode(&config)
+}
+
+func getConfigFile() (string, error) {
+	configDir, configDirErr := getConfigDir()
+	if configDirErr != nil {
+		return "", configDirErr
+	}
+
+	createErr := ensureConfigDirExists(configDir)
+	if createErr != nil {
+		return "", createErr
+	}
+
+	return filepath.Join(configDir, "config.json"), nil
+}
+
+func ensureConfigDirExists(folder string) error {
+	return os.MkdirAll(folder, 0o750)
+}
+
+func getConfigDir() (string, error) {
+	configDir, configDirErr := os.UserConfigDir()
+	if configDirErr != nil {
+		return "", configDirErr
+	}
+
+	return filepath.Join(configDir, "mcg"), nil
+}