pkg/util/{filepath.go,shortid_generator.go}: Fix golint issues

See,
$ gometalinter --vendor --deadline 10m --disable-all --enable=golint  ./...
filepath.go:12:5:warning: error var WalkSkipDir should have name of the form ErrFoo (golint)
shortid_generator.go:11:5:warning: var validUidPattern should be validUIDPattern (golint)
shortid_generator.go:19:6:warning: func IsValidShortUid should be IsValidShortUID (golint)
shortid_generator.go:24:6:warning: func GenerateShortUid should be GenerateShortUID (golint)

pkg/middleware/dashboard_redirect_test.go

@@ -20,7 +20,7 @@ func TestMiddlewareDashboardRedirect(t *testing.T) {
 		fakeDash.Id = 1
 		fakeDash.FolderId = 1
 		fakeDash.HasAcl = false
-		fakeDash.Uid = util.GenerateShortUid()
+		fakeDash.Uid = util.GenerateShortUID()
 
 		bus.AddHandler("test", func(query *m.GetDashboardQuery) error {
 			query.Result = fakeDash

pkg/plugins/plugins.go

@@ -169,7 +169,7 @@ func (scanner *PluginScanner) walker(currentPath string, f os.FileInfo, err erro
 	}
 
 	if f.Name() == "node_modules" {
-		return util.WalkSkipDir
+		return util.ErrWalkSkipDir
 	}
 
 	if f.IsDir() {

pkg/services/dashboards/dashboard_service.go

@@ -80,7 +80,7 @@ func (dr *dashboardServiceImpl) buildSaveDashboardCommand(dto *SaveDashboardDTO,
 		return nil, models.ErrDashboardFolderNameExists
 	}
 
-	if !util.IsValidShortUid(dash.Uid) {
+	if !util.IsValidShortUID(dash.Uid) {
 		return nil, models.ErrDashboardInvalidUid
 	} else if len(dash.Uid) > 40 {
 		return nil, models.ErrDashboardUidToLong

pkg/services/sqlstore/dashboard.go

@@ -27,7 +27,7 @@ func init() {
 	bus.AddHandler("sql", HasEditPermissionInFolders)
 }
 
-var generateNewUid func() string = util.GenerateShortUid
+var generateNewUid func() string = util.GenerateShortUID
 
 func SaveDashboard(cmd *m.SaveDashboardCommand) error {
 	return inTransaction(func(sess *DBSession) error {

pkg/services/sqlstore/dashboard_test.go

@@ -106,7 +106,7 @@ func TestDashboardDataAccess(t *testing.T) {
 					if timesCalled <= 2 {
 						return savedDash.Uid
 					}
-					return util.GenerateShortUid()
+					return util.GenerateShortUID()
 				}
 				cmd := m.SaveDashboardCommand{
 					OrgId: 1,
@@ -119,7 +119,7 @@ func TestDashboardDataAccess(t *testing.T) {
 				err := SaveDashboard(&cmd)
 				So(err, ShouldBeNil)
 
-				generateNewUid = util.GenerateShortUid
+				generateNewUid = util.GenerateShortUID
 			})
 
 			Convey("Should be able to create dashboard", func() {

pkg/util/filepath.go

@@ -8,8 +8,8 @@ import (
 	"path/filepath"
 )
 
-//WalkSkipDir is the Error returned when we want to skip descending into a directory
-var WalkSkipDir = errors.New("skip this directory")
+//ErrWalkSkipDir is the Error returned when we want to skip descending into a directory
+var ErrWalkSkipDir = errors.New("skip this directory")
 
 //WalkFunc is a callback function called for each path as a directory is walked
 //If resolvedPath != "", then we are following symbolic links.
@@ -50,7 +50,7 @@ func walk(path string, info os.FileInfo, resolvedPath string, symlinkPathsFollow
 	}
 	err := walkFn(resolvedPath, info, nil)
 	if err != nil {
-		if info.IsDir() && err == WalkSkipDir {
+		if info.IsDir() && err == ErrWalkSkipDir {
 			err = nil
 		}
 		return err

pkg/util/shortid_generator.go

@@ -8,19 +8,19 @@ import (
 
 var allowedChars = shortid.DefaultABC
 
-var validUidPattern = regexp.MustCompile(`^[a-zA-Z0-9\-\_]*$`).MatchString
+var validUIDPattern = regexp.MustCompile(`^[a-zA-Z0-9\-\_]*$`).MatchString
 
 func init() {
 	gen, _ := shortid.New(1, allowedChars, 1)
 	shortid.SetDefault(gen)
 }
 
-// IsValidShortUid checks if short unique identifier contains valid characters
-func IsValidShortUid(uid string) bool {
-	return validUidPattern(uid)
+// IsValidShortUID checks if short unique identifier contains valid characters
+func IsValidShortUID(uid string) bool {
+	return validUIDPattern(uid)
 }
 
-// GenerateShortUid generates a short unique identifier.
-func GenerateShortUid() string {
+// GenerateShortUID generates a short unique identifier.
+func GenerateShortUID() string {
 	return shortid.MustGenerate()
 }

pkg/util/shortid_generator_test.go

@@ -4,7 +4,7 @@ import "testing"
 
 func TestAllowedCharMatchesUidPattern(t *testing.T) {
 	for _, c := range allowedChars {
-		if !IsValidShortUid(string(c)) {
+		if !IsValidShortUID(string(c)) {
 			t.Fatalf("charset for creating new shortids contains chars not present in uid pattern")
 		}
 	}