1 files changed, 96 insertions, 0 deletions
diff --git a/pkg/app/config.go b/pkg/app/config.go
index d34e647..815b5b0 100644
--- a/pkg/app/config.go
+++ b/pkg/app/config.go
@@ -1,16 +1,112 @@
 package app
 
 import (
+	"os"
+	"path/filepath"
+	"runtime"
 
+	"github.com/spf13/viper"
+	log "github.com/sirupsen/logrus"
 )
 
+// Config type is the configuration entity of the application
 type Config struct {
 	Mode string
 	Directories []string
 }
 
+// config file stuff
+var (
+	configFileName = "config"
+	configFileExt = ".yml"
+	configType = "yaml"
+	appName = "gitbatch"
+
+	configurationDirectory = filepath.Join(osConfigDirectory(), appName)
+	configFileAbsPath = filepath.Join(configurationDirectory, configFileName)
+)
+
+// configuration items
+var (
+	modeKey = "mode"
+	modeKeyDefault = "fetch"
+	pathsKey = "paths"
+	pathsKeyDefault = []string{"."}
+)
+
+// LoadConfiguration returns a Config struct is filled 
 func LoadConfiguration() (*Config, error) {
+	if err := initializeConfigurationManager(); err != nil {
+		return nil, err
+	}
+	if err := setDefaults(); err != nil {
+		return nil, err
+	}
+	if err := readConfiguration(); err != nil {
+		return nil, err
+	}
 	config := &Config{
+		Mode: viper.GetString(modeKey),
+		Directories: viper.GetStringSlice(pathsKey),
 	}
 	return config, nil
+}
+
+// set default configuration parameters
+func setDefaults() error {
+	viper.SetDefault(modeKey, modeKeyDefault)
+	// viper.SetDefault(pathsKey, pathsKeyDefault)
+	return nil
+}
+
+// read configuration from file
+func readConfiguration() error{
+	err := viper.ReadInConfig() // Find and read the config file
+	if err != nil { // Handle errors reading the config file
+		// if file does not exist, simply create one
+		if _, err := os.Stat(configFileAbsPath+configFileExt); os.IsNotExist(err) {
+			os.MkdirAll(configurationDirectory, 0755)
+			os.Create(configFileAbsPath+configFileExt)
+		} else {
+			return err
+		}
+		// let's write defaults
+		if err := viper.WriteConfig(); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// write configuration to a file
+func writeConfiguration() error{
+	if err := viper.WriteConfig(); err != nil {
+		return err
+	}
+	return nil
+}
+
+// initialize the configuration manager
+func initializeConfigurationManager() error {
+	// config viper
+	viper.AddConfigPath(configurationDirectory)
+	viper.SetConfigName(configFileName)
+	viper.SetConfigType(configType)
+
+	return nil
+}
+
+// returns OS dependent config directory
+func osConfigDirectory() (osConfigDirectory string) {
+	switch osname := runtime.GOOS; osname {
+	case "windows":
+		osConfigDirectory = os.Getenv("APPDATA")
+	case "darwin":
+		osConfigDirectory = os.Getenv("HOME") + "/Library/Application Support"
+	case "linux":
+		osConfigDirectory = os.Getenv("HOME") + "/.config"
+	default:
+		log.Warn("Operating system couldn't be recognized")
+	}
+	return osConfigDirectory
 }
 \ No newline at end of file