Warning fixes and other cleanups (#62)

* Simplify some code via gosimple

See https://github.com/dominikh/go-simple.

* strings: use bytes.Buffer directly

It has methods to write strings and bytes already, which is much easier
and also faster than going through a regular write of []byte.

* Run go fmt

* CI: Bump Go versions

.travis.yml

 language: go
 
 go:
-  - 1.4.3
-  - 1.5.1
+  - 1.5.4
+  - 1.6.3

branches.go

@@ -201,10 +201,5 @@ func (s *BranchesService) DeleteBranch(pid interface{}, branch string) (*Respons
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }

deploy_keys.go

@@ -148,10 +148,5 @@ func (s *DeployKeysService) DeleteDeployKey(pid interface{}, deployKey int) (*Re
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }

gitlab.go

@@ -210,11 +210,7 @@ func (c *Client) SetBaseURL(urlStr string) error {
 
 	var err error
 	c.baseURL, err = url.Parse(urlStr)
-	if err != nil {
 	return err
-	}
-
-	return nil
 }
 
 // NewRequest creates an API request. A relative URL path can be provided in

groups.go

@@ -161,12 +161,7 @@ func (s *GroupsService) DeleteGroup(gid interface{}) (*Response, error) {
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // SearchGroup get all groups that match your string in their name or path.
@@ -319,10 +314,5 @@ func (s *GroupsService) RemoveGroupMember(gid interface{}, user int) (*Response,
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }

issues.go

@@ -273,10 +273,5 @@ func (s *IssuesService) DeleteIssue(pid interface{}, issue int) (*Response, erro
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }

labels.go

@@ -127,12 +127,7 @@ func (s *LabelsService) DeleteLabel(pid interface{}, opt *DeleteLabelOptions) (*
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // UpdateLabelOptions represents the available UpdateLabel() options.

project_snippets.go

@@ -212,12 +212,7 @@ func (s *ProjectSnippetsService) DeleteSnippet(pid interface{}, snippet int) (*R
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // SnippetContent returns the raw project snippet as plain text.

projects.go

@@ -488,12 +488,7 @@ func (s *ProjectsService) DeleteProject(pid interface{}) (*Response, error) {
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // ProjectMember represents a project member.
@@ -665,12 +660,7 @@ func (s *ProjectsService) DeleteProjectMember(pid interface{}, user int) (*Respo
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // ProjectHook represents a project hook.
@@ -844,12 +834,7 @@ func (s *ProjectsService) DeleteProjectHook(pid interface{}, hook int) (*Respons
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // ProjectForkRelation represents a project fork relationship.
@@ -900,12 +885,7 @@ func (s *ProjectsService) DeleteProjectForkRelation(pid int) (*Response, error)
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // Archives the project if the user is either admin or the project owner

services.go

@@ -71,12 +71,7 @@ func (s *ServicesService) SetGitLabCIService(
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // DeleteGitLabCIService deletes GitLab CI service settings for a project.
@@ -95,12 +90,7 @@ func (s *ServicesService) DeleteGitLabCIService(pid interface{}) (*Response, err
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // SetHipChatServiceOptions represents the available SetHipChatService()
@@ -131,12 +121,7 @@ func (s *ServicesService) SetHipChatService(
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // DeleteHipChatService deletes HipChat service for project.
@@ -155,12 +140,7 @@ func (s *ServicesService) DeleteHipChatService(pid interface{}) (*Response, erro
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // SetDroneCIServiceOptions represents the available SetDroneCIService()
@@ -192,12 +172,7 @@ func (s *ServicesService) SetDroneCIService(
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // DeleteDroneCIService deletes Drone CI service settings for a project.
@@ -216,12 +191,7 @@ func (s *ServicesService) DeleteDroneCIService(pid interface{}) (*Response, erro
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // DroneCIServiceProperties represents Drone CI specific properties.
@@ -291,12 +261,7 @@ func (s *ServicesService) SetSlackService(
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // DeleteSlackService deletes Slack service for project.
@@ -315,10 +280,5 @@ func (s *ServicesService) DeleteSlackService(pid interface{}) (*Response, error)
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }

strings.go

@@ -19,7 +19,6 @@ package gitlab
 import (
 	"bytes"
 	"fmt"
-	"io"
 
 	"reflect"
 )
@@ -35,9 +34,9 @@ func Stringify(message interface{}) string {
 }
 
 // stringifyValue was heavily inspired by the goprotobuf library.
-func stringifyValue(w io.Writer, val reflect.Value) {
+func stringifyValue(buf *bytes.Buffer, val reflect.Value) {
 	if val.Kind() == reflect.Ptr && val.IsNil() {
-		w.Write([]byte("<nil>"))
+		buf.WriteString("<nil>")
 		return
 	}
 
@@ -45,25 +44,25 @@ func stringifyValue(w io.Writer, val reflect.Value) {
 
 	switch v.Kind() {
 	case reflect.String:
-		fmt.Fprintf(w, `"%s"`, v)
+		fmt.Fprintf(buf, `"%s"`, v)
 	case reflect.Slice:
-		w.Write([]byte{'['})
+		buf.WriteByte('[')
 		for i := 0; i < v.Len(); i++ {
 			if i > 0 {
-				w.Write([]byte{' '})
+				buf.WriteByte(' ')
 			}
 
-			stringifyValue(w, v.Index(i))
+			stringifyValue(buf, v.Index(i))
 		}
 
-		w.Write([]byte{']'})
+		buf.WriteByte(']')
 		return
 	case reflect.Struct:
 		if v.Type().Name() != "" {
-			w.Write([]byte(v.Type().String()))
+			buf.WriteString(v.Type().String())
 		}
 
-		w.Write([]byte{'{'})
+		buf.WriteByte('{')
 
 		var sep bool
 		for i := 0; i < v.NumField(); i++ {
@@ -76,20 +75,20 @@ func stringifyValue(w io.Writer, val reflect.Value) {
 			}
 
 			if sep {
-				w.Write([]byte(", "))
+				buf.WriteString(", ")
 			} else {
 				sep = true
 			}
 
-			w.Write([]byte(v.Type().Field(i).Name))
-			w.Write([]byte{':'})
-			stringifyValue(w, fv)
+			buf.WriteString(v.Type().Field(i).Name)
+			buf.WriteByte(':')
+			stringifyValue(buf, fv)
 		}
 
-		w.Write([]byte{'}'})
+		buf.WriteByte('}')
 	default:
 		if v.CanInterface() {
-			fmt.Fprint(w, v.Interface())
+			fmt.Fprint(buf, v.Interface())
 		}
 	}
 }

system_hooks.go

@@ -139,10 +139,5 @@ func (s *SystemHooksService) DeleteHook(hook int) (*Response, error) {
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }

users.go

@@ -208,12 +208,7 @@ func (s *UsersService) DeleteUser(user int) (*Response, error) {
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // CurrentUser gets currently authenticated user.
@@ -367,12 +362,7 @@ func (s *UsersService) DeleteSSHKey(kid int) (*Response, error) {
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // DeleteSSHKeyForUser deletes key owned by a specified user. Available only
@@ -388,12 +378,7 @@ func (s *UsersService) DeleteSSHKeyForUser(user int, kid int) (*Response, error)
 		return nil, err
 	}
 
-	resp, err := s.client.Do(req, nil)
-	if err != nil {
-		return resp, err
-	}
-
-	return resp, err
+	return s.client.Do(req, nil)
 }
 
 // BlockUser blocks the specified user. Available only for admin.