Address warnings and minor cleanups

* Majority of the changes include:
    - using strings.EqualFold for case
      insensitive matching
    - Removing nil checks for slices
    - strings.Contains instead of strings.Index
      to check for substring availability

Signed-off-by: Madhav Jivrajani <madhav.jiv@gmail.com>

cmd/audit.go

@@ -18,7 +18,6 @@ package cmd
 
 import (
 	"fmt"
-	"github.com/pkg/errors"
 	"io/ioutil"
 	"net/http"
 	"os"
@@ -30,6 +29,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/pkg/errors"
+
 	"github.com/spf13/cobra"
 	"k8s.io/apimachinery/pkg/util/sets"
 
@@ -96,13 +97,11 @@ func auditLocalOwnersFiles(context *utils.Context, args []string) {
 	for _, groups := range context.PrefixToGroupMap() {
 		for _, group := range groups {
 			listOfGroups = append(listOfGroups, group.Dir)
-			var files []string
 			for _, subproject := range group.Subprojects {
 				for _, owner := range subproject.Owners {
 					if strings.Contains(owner, "/kubernetes/kubernetes/") {
 						split := strings.SplitN(owner, "/", 7)
 						filename := split[len(split)-1]
-						files = append(files, filename)
 						if val, ok := mapFilesToGroups[filename]; ok {
 							val.Insert(group.Dir)
 						} else {
@@ -172,7 +171,7 @@ func auditLocalOwnersFiles(context *utils.Context, args []string) {
 		}
 	}
 	for _, line := range infoLog.List() {
-		fmt.Printf(line)
+		fmt.Println(line)
 	}
 }
 

cmd/export.go

@@ -18,12 +18,13 @@ package cmd
 
 import (
 	"fmt"
-	"github.com/spf13/cobra"
 	"os"
 	"sort"
 	"strings"
 	"time"
 
+	"github.com/spf13/cobra"
+
 	"k8s.io/apimachinery/pkg/util/sets"
 
 	"github.com/dims/maintainers/pkg/utils"
@@ -91,7 +92,7 @@ func exportOwnersAndAliases(pwd string) error {
 		}
 		userIDs.Insert(configOwners.Approvers...)
 		userIDs.Insert(configOwners.Reviewers...)
-		for key, _ := range repoAliases {
+		for key := range repoAliases {
 			if userIDs.Has(key) {
 				userIDs.Delete(key)
 				aliases.Insert(key)

cmd/prune.go

@@ -18,13 +18,14 @@ package cmd
 
 import (
 	"fmt"
-	"github.com/spf13/cobra"
 	"os"
 	"path/filepath"
 	"sort"
 	"strings"
 	"time"
 
+	"github.com/spf13/cobra"
+
 	"k8s.io/apimachinery/pkg/util/sets"
 
 	"github.com/dims/maintainers/pkg/utils"
@@ -75,25 +76,39 @@ var pruneCmd = &cobra.Command{
 		var ownerContribs []utils.Contribution
 
 		if !skipDS {
-			err, contribs := utils.GetContributionsForAYear(repositoryDS, periodDS)
+			contribs, err := utils.GetContributionsForAYear(repositoryDS, periodDS)
 			if err != nil {
 				panic(err)
 			}
-			if contribs == nil || len(contribs) == 0 {
+			if len(contribs) == 0 {
 				panic("unable to find any contributions in repository : " + repositoryDS)
 			}
 			for _, id := range uniqueUsers {
 				for _, item := range contribs {
-					if strings.ToLower(item.ID) == strings.ToLower(id) {
-						ownerContribs = append(ownerContribs, utils.Contribution{id, item.ID, item.ContribCount, -1})
+					if strings.EqualFold(item.ID, id) {
+						ownerContribs = append(ownerContribs,
+							utils.Contribution{
+								ID:           id,
+								Alias:        item.ID,
+								ContribCount: item.ContribCount,
+								CommentCount: -1,
+							},
+						)
 						userIDs.Delete(id)
 						break
 					}
 				}
 			}
 		} else {
 			for _, id := range uniqueUsers {
-				ownerContribs = append(ownerContribs, utils.Contribution{id, id, -1, -1})
+				ownerContribs = append(ownerContribs,
+					utils.Contribution{
+						ID:           id,
+						Alias:        id,
+						ContribCount: -1,
+						CommentCount: -1,
+					},
+				)
 				userIDs.Delete(id)
 			}
 		}
@@ -233,7 +248,7 @@ func getOwnersAndAliases(pwd string) (sets.String, map[string][]string, []string
 		userIDs.Insert(configOwners.Reviewers...)
 	}
 
-	for key, _ := range repoAliases {
+	for key := range repoAliases {
 		userIDs.Delete(key)
 	}
 	if len(aliasPath) > 0 {

cmd/validate.go

@@ -73,7 +73,7 @@ var validateCmd = &cobra.Command{
 		errors2 := warnFileMismatchesBetweenKubernetesRepoAndSigsYaml(fileMap)
 		errors = append(errors, errors2...)
 
-		if errors != nil && len(errors) > 0 {
+		if len(errors) > 0 {
 			for _, err := range errors {
 				fmt.Printf("WARNING: %v\n", err)
 			}
@@ -90,7 +90,7 @@ func warnFileMismatchesBetweenKubernetesRepoAndSigsYaml(fileMap map[string]strin
 	}
 
 	for key, val := range fileMap {
-		if strings.Index(key, "kubernetes/kubernetes") == -1 {
+		if !strings.Contains(key, "kubernetes/kubernetes") {
 			continue
 		}
 		found := false

pkg/utils/devstats_utils.go

@@ -20,13 +20,14 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"github.com/pkg/errors"
 	"io/ioutil"
 	"net/http"
 	"strings"
+
+	"github.com/pkg/errors"
 )
 
-func GetContributionsForAYear(repository string, period string) (error, []Contribution) {
+func GetContributionsForAYear(repository string, period string) ([]Contribution, error) {
 	postBody := `{
 	"queries": [{
 		"refId": "A",
@@ -47,22 +48,22 @@ func GetContributionsForAYear(repository string, period string) (error, []Contri
 	requestBody := bytes.NewBuffer([]byte(postBody))
 	resp, err := http.Post("https://k8s.devstats.cncf.io/api/ds/query", "application/json", requestBody)
 	if err != nil {
-		return err, nil
+		return nil, err
 	}
 	defer resp.Body.Close()
 
 	if resp.StatusCode != http.StatusOK {
-		return errors.Wrap(err, "bad error code from devstats : "+string(resp.StatusCode)), nil
+		return nil, errors.Wrap(err, fmt.Sprintf("bad error code from devstats: %d", resp.StatusCode))
 	}
 
 	var parsed map[string]map[string]map[string][]Frames
 	body, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
-		return err, nil
+		return nil, err
 	}
 	err = json.Unmarshal(body, &parsed)
 	if err != nil {
-		return errors.Wrap(err, "unable to parse json from devstats"), nil
+		return nil, errors.Wrap(err, "unable to parse json from devstats")
 	}
 
 	foo := parsed["results"]["A"]["frames"][0].Data.Items[0]
@@ -72,5 +73,5 @@ func GetContributionsForAYear(repository string, period string) (error, []Contri
 	for i := 0; i < len(foo); i++ {
 		contribs = append(contribs, Contribution{foo[i].(string), "", int(bar[i].(float64)), -1})
 	}
-	return nil, contribs
+	return contribs, nil
 }

pkg/utils/file_utils.go

@@ -94,7 +94,7 @@ func GetOwnerFiles(root string) ([]string, error) {
 		if info.IsDir() {
 			return nil
 		}
-		if "OWNERS" == filepath.Base(path) && !strings.Contains(path, "vendor") {
+		if filepath.Base(path) == "OWNERS" && !strings.Contains(path, "vendor") {
 			matches = append(matches, path)
 		}
 		return nil

pkg/utils/github_utils.go

@@ -103,7 +103,7 @@ func GetKubernetesOwnersFiles() (*[]string, error) {
 	directories := make([]string, len(c.Files))
 	for _, directory := range c.Files {
 		if len(directory.Path) > 0 &&
-			strings.Index(directory.Path, "/OWNERS") != -1 &&
+			strings.Contains(directory.Path, "/OWNERS") &&
 			strings.Index(directory.Path, "vendor/") != 0 {
 			directories = append(directories, directory.Path)
 		}

pkg/utils/yaml_utils.go

@@ -80,7 +80,7 @@ func switchToEmeritus(rootNode *yaml3.Node, user string) {
 func addUserToEmeritusList(emeritusSeqNode *yaml3.Node, user string) {
 	foundInEmeritusList := false
 	for _, item := range emeritusSeqNode.Content {
-		if item.Kind == yaml3.ScalarNode && strings.ToLower(item.Value) == strings.ToLower(user) {
+		if item.Kind == yaml3.ScalarNode && strings.EqualFold(item.Value, user) {
 			foundInEmeritusList = true
 		}
 	}
@@ -169,7 +169,7 @@ func removeUserFromApproversAndReviewers(mappingNode *yaml3.Node, user string) b
 				var newList []*yaml3.Node
 				for _, item := range seqNode.Content {
 					// skip the user we want to eliminate from the list
-					if item.Kind == yaml3.ScalarNode && strings.ToLower(item.Value) == strings.ToLower(user) {
+					if item.Kind == yaml3.ScalarNode && strings.EqualFold(item.Value, user) {
 						if node.Value == "approvers" {
 							foundInApproverList = true
 						}