merge and update Import and Export

Author: ahmdrz

account.go

@@ -73,7 +73,15 @@ type Account struct {
 // Sync updates account information
 func (account *Account) Sync() error {
 	insta := account.inst
-	body, err := insta.sendSimpleRequest(urlUserByID, account.ID)
+	data, err := insta.prepareData()
+	if err != nil {
+		return err
+	}
+	body, err := insta.sendRequest(&reqOptions{
+		Endpoint: urlCurrentUser,
+		Query:    generateSignature(data),
+		IsPost:   true,
+	})
 	if err == nil {
 		resp := profResp{}
 		err = json.Unmarshal(body, &resp)

goinsta.go

@@ -130,12 +130,12 @@ func (inst *Instagram) UnsetProxy() {
 }
 
 // Save exports config to ~/.goinsta
-func (inst *Instagram) Save() {
-	home := os.Getenv("$HOME")
+func (inst *Instagram) Save() error {
+	home := os.Getenv("HOME")
 	if home == "" {
-		home = os.Getenv("$home") // for plan9
+		home = os.Getenv("home") // for plan9
 	}
-	inst.Export(filepath.Join(home, ".goinsta"))
+	return inst.Export(filepath.Join(home, ".goinsta"))
 }
 
 // Export exports *Instagram object options
@@ -369,7 +369,7 @@ func (inst *Instagram) Login() error {
 	if err != nil {
 		return err
 	}
-	_, err = inst.sendRequest(
+	body, err := inst.sendRequest(
 		&reqOptions{
 			Endpoint: urlLogin,
 			Query:    generateSignature(b2s(result)),
@@ -384,6 +384,10 @@ func (inst *Instagram) Login() error {
 
 	// getting account data
 	res := accountResp{}
+	err = json.Unmarshal(body, &res)
+	if err != nil {
+		return err
+	}
 
 	inst.Account = &res.Account
 	inst.Account.inst = inst

users.go

@@ -80,6 +80,11 @@ func (users *Users) Next() bool {
 	return false
 }
 
+// Error returns users error
+func (users *Users) Error() error {
+	return users.err
+}
+
 func (users *Users) setValues() {
 	for i := range users.Users {
 		users.Users[i].inst = users.inst