User config, custom journal dir

config/config.go

@@ -0,0 +1,90 @@
+package config
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/pelletier/go-toml/v2"
+)
+
+type Config struct {
+	JournalDir string `toml:"journal_dir"`
+}
+
+func Default() (Config, error) {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return Config{}, fmt.Errorf("cannot determine home dir: %w", err)
+	}
+	return Config{
+		JournalDir: filepath.Join(home, "journal"),
+	}, nil
+}
+
+func Path() (string, error) {
+	cd, err := os.UserConfigDir()
+	if err != nil {
+		return "", fmt.Errorf("could not determine user config dir: %w", err)
+	}
+	configPath := filepath.Join(cd, "journal.toml")
+	return configPath, nil
+}
+
+func LoadOrCreate() (Config, bool, error) {
+
+	configPath, err := Path()
+	if err != nil {
+		return Config{}, false, fmt.Errorf("could not determine user config dir: %w", err)
+	}
+
+	f, err := os.Open(configPath)
+
+	if err != nil && !errors.Is(err, os.ErrNotExist) {
+		fmt.Printf("\n\nerr: %v %T\n\n", err, err)
+		return Config{}, false, fmt.Errorf("could not open user config '%s': %w", configPath, err)
+	} else if err != nil { // not exist
+		f, err = os.Create(configPath)
+		if err != nil {
+			return Config{}, false, fmt.Errorf("could not create user config '%s': %w", configPath, err)
+		}
+		def, err := Default()
+		if err != nil {
+			return Config{}, false, fmt.Errorf("could not generate default config: %w", err)
+		}
+
+		err = toml.NewEncoder(f).Encode(def)
+		if err != nil {
+			return Config{}, false, fmt.Errorf("could not encode new config: %w", err)
+		}
+
+		err = f.Close()
+		if err != nil {
+			return Config{}, false, fmt.Errorf("could not close file: %w", err)
+		}
+
+		return def, true, createJournalDirIfNecessary(def)
+	} else {
+		config := Config{}
+		err = toml.NewDecoder(f).Decode(&config)
+		if err != nil {
+			return Config{}, false, fmt.Errorf("could not decode config in '%s': %w", configPath, err)
+		}
+		err = f.Close()
+		if err != nil {
+			return Config{}, false, fmt.Errorf("could not close file: %w", err)
+		}
+		return config, false, createJournalDirIfNecessary(config)
+	}
+}
+
+func createJournalDirIfNecessary(c Config) error {
+	err := os.Mkdir(c.JournalDir, 0777)
+	if err != nil && errors.Is(err, os.ErrExist) {
+		return nil
+	} else if err != nil {
+		return err
+	}
+	return nil
+}