Initial commit.

configuration/exported.go

@@ -0,0 +1,29 @@
+package configuration
+
+import (
+	// stdlib
+	"flag"
+	"log"
+	"os"
+)
+
+var (
+	configurationPath string
+
+	Cfg *config
+)
+
+// Initialize initializes package.
+func Initialize(cfgpath string) {
+	log.Println("Initializing configuration")
+
+	configurationPath = cfgpath
+
+	Cfg = &config{}
+	err := Cfg.initialize()
+	if err != nil {
+		log.Println("Error appeared when loading configuration:", err.Error())
+		flag.PrintDefaults()
+		os.Exit(1)
+	}
+}

configuration/struct.go

@@ -0,0 +1,65 @@
+package configuration
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"gopkg.in/yaml.v2"
+)
+
+// This structure holds whole configuration for glp.
+type config struct {
+	Log struct {
+		Debug bool `yaml:"debug"`
+	} `yaml:"log"`
+}
+
+// Tries to parse configuration.
+func (c *config) initialize() error {
+	// Check if file exists.
+	if _, err := os.Stat(configurationPath); os.IsNotExist(err) {
+		return err
+	}
+
+	// Validate configuration file path.
+	// First - replace any "~" that might appear.
+	if strings.Contains(configurationPath, "~") {
+		userDir, err := os.UserHomeDir()
+		if err != nil {
+			return err
+		}
+
+		configurationPath = strings.Replace(configurationPath, "~", userDir, -1)
+	}
+
+	// Then - make relative paths to be absolute.
+	absPath, err1 := filepath.Abs(configurationPath)
+	if err1 != nil {
+		return err1
+	}
+
+	configurationPath = absPath
+
+	log.Println("Trying to load configuration file data from '" + configurationPath + "'")
+
+	// Read file into memory.
+	fileData, err2 := ioutil.ReadFile(configurationPath)
+	if err2 != nil {
+		return err2
+	}
+
+	// Try to parse loaded data.
+	err3 := yaml.Unmarshal(fileData, c)
+	if err3 != nil {
+		return err3
+	}
+
+	if c.Log.Debug {
+		log.Printf("Configuration parsed: %+v\n", c)
+	}
+
+	return nil
+}