checking for config file

chub/config.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"encoding/json"
+	"github.com/edindazdarevic/confighub/chub/globals"
+	homedir "github.com/mitchellh/go-homedir"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+)
+
+type config struct {
+	MachineGuid string
+}
+
+func configurationDirectoryName() string {
+	directoryName, err := homedir.Dir()
+	globals.PanicWithStyle("I cannot find your home directory. Are you homeless ? ", err)
+
+	expandedDirectoryName, err := homedir.Expand(directoryName)
+	globals.PanicWithStyle("Cannot know your full path to home directory. Is it a secret ? ", err)
+
+	return expandedDirectoryName + globals.RuneToAscii(filepath.Separator) + globals.ConfigurationDirectoryName
+}
+
+func configurationFilePath() string {
+
+	return configurationDirectoryName() + globals.RuneToAscii(filepath.Separator) + globals.ConfigurationFileName
+
+}
+
+func saveGuidToHomedir(configuration config) {
+	directory := configurationDirectoryName()
+	if !globals.FileExists(directory) {
+		err := os.Mkdir(directory, globals.ConfigurationFilePermissions)
+		globals.PanicWithStyle("I simply cannot make the directory. Am I alowed to ?", err)
+	}
+
+	configByteContent, err := json.Marshal(configuration)
+	globals.PanicWithStyle("Something is terribly wrong. I am sorry. I am so so sorry. :~(", err)
+
+	err = ioutil.WriteFile(configurationFilePath(), configByteContent, globals.ConfigurationFilePermissions)
+	globals.PanicWithStyle("I cannot write to config file in user directory. How can this be ?", err)
+}
+
+func loadGuidFromHomedir() config {
+	result := config{}
+
+	file, err := ioutil.ReadFile(configurationFilePath())
+	globals.PanicWithStyle("I cannot read config file in user directory. How can this be ?", err)
+
+	json.Unmarshal(file, &result)
+	return result
+
+}