Introduce settings.json to store custom sources

settings/settings.go

@@ -0,0 +1,66 @@
+package settings
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"git.nemunai.re/nemunaire/hathoris/config"
+)
+
+type CustomSource struct {
+	Source string            `json:"src"`
+	KV     map[string]string `json:"kv"`
+}
+
+type Settings struct {
+	CustomSources []CustomSource `json:"custom_sources"`
+}
+
+func Load(cfg *config.Config) (*Settings, error) {
+	if cfg.SettingsPath == "" {
+		return &Settings{}, nil
+	}
+
+	if st, err := os.Stat(cfg.SettingsPath); os.IsNotExist(err) || (err == nil && st.Size() == 0) {
+		fd, err := os.Create(cfg.SettingsPath)
+		if err != nil {
+			return nil, fmt.Errorf("unable to create settings file: %w", err)
+		}
+
+		_, err = fd.Write([]byte("{}"))
+		fd.Close()
+		if err != nil {
+			return nil, fmt.Errorf("unable to write to settings file: %w", err)
+		}
+	}
+
+	fd, err := os.Open(cfg.SettingsPath)
+	if err != nil {
+		return nil, fmt.Errorf("unable to open settings: %w", err)
+	}
+	defer fd.Close()
+
+	var settings Settings
+	err = json.NewDecoder(fd).Decode(&settings)
+	if err != nil {
+		return nil, fmt.Errorf("unable to read settings: %w", err)
+	}
+
+	return &settings, nil
+}
+
+func (settings *Settings) Save(path string) error {
+	fd, err := os.Create(path)
+	if err != nil {
+		return fmt.Errorf("unable to create settings file: %w", err)
+	}
+	defer fd.Close()
+
+	err = json.NewEncoder(fd).Encode(settings)
+	if err != nil {
+		return fmt.Errorf("unable to read settings: %w", err)
+	}
+
+	return nil
+}