Enable more `revive` linter rules (#30608)

Noteable additions:

- `redefines-builtin-id` forbid variable names that shadow go builtins
- `empty-lines` remove unnecessary empty lines that `gofumpt` does not
remove for some reason
- `superfluous-else` eliminate more superfluous `else` branches

Rules are also sorted alphabetically and I cleaned up various parts of
`.golangci.yml`.

17 files changed, 37 insertions, 51 deletions

diff --git a/modules/auth/password/password.go b/modules/auth/password/password.go
index 27074358a9..85f9780709 100644
--- a/modules/auth/password/password.go
+++ b/modules/auth/password/password.go
@@ -63,16 +63,16 @@ func NewComplexity() {
 func setupComplexity(values []string) {
 	if len(values) != 1 || values[0] != "off" {
 		for _, val := range values {
-			if complex, ok := charComplexities[val]; ok {
-				validChars += complex.ValidChars
-				requiredList = append(requiredList, complex)
+			if complexity, ok := charComplexities[val]; ok {
+				validChars += complexity.ValidChars
+				requiredList = append(requiredList, complexity)
 			}
 		}
 		if len(requiredList) == 0 {
 			// No valid character classes found; use all classes as default
-			for _, complex := range charComplexities {
-				validChars += complex.ValidChars
-				requiredList = append(requiredList, complex)
+			for _, complexity := range charComplexities {
+				validChars += complexity.ValidChars
+				requiredList = append(requiredList, complexity)
 			}
 		}
 	}
diff --git a/modules/git/batch_reader.go b/modules/git/batch_reader.go
index 043dbb44bd..c988d6ab86 100644
--- a/modules/git/batch_reader.go
+++ b/modules/git/batch_reader.go
@@ -307,10 +307,10 @@ func ParseTreeLine(objectFormat ObjectFormat, rd *bufio.Reader, modeBuf, fnameBu
 
 	// Deal with the binary hash
 	idx = 0
-	len := objectFormat.FullLength() / 2
-	for idx < len {
+	length := objectFormat.FullLength() / 2
+	for idx < length {
 		var read int
-		read, err = rd.Read(shaBuf[idx:len])
+		read, err = rd.Read(shaBuf[idx:length])
 		n += read
 		if err != nil {
 			return mode, fname, sha, n, err
diff --git a/modules/git/commit_reader.go b/modules/git/commit_reader.go
index f1f4a0e588..228bbaf314 100644
--- a/modules/git/commit_reader.go
+++ b/modules/git/commit_reader.go
@@ -49,9 +49,8 @@ readLoop:
 			if len(line) > 0 && line[0] == ' ' {
 				_, _ = signatureSB.Write(line[1:])
 				continue
-			} else {
-				pgpsig = false
 			}
+			pgpsig = false
 		}
 
 		if !message {
diff --git a/modules/git/pipeline/lfs_nogogit.go b/modules/git/pipeline/lfs_nogogit.go
index 4c65249089..fe320f39f3 100644
--- a/modules/git/pipeline/lfs_nogogit.go
+++ b/modules/git/pipeline/lfs_nogogit.go
@@ -232,7 +232,6 @@ func FindLFSFile(repo *git.Repository, objectID git.ObjectID) ([]*LFSResult, err
 				errChan <- err
 				break
 			}
-
 		}
 	}()
 
diff --git a/modules/git/repo_commit.go b/modules/git/repo_commit.go
index 44273d2253..f9168bef7e 100644
--- a/modules/git/repo_commit.go
+++ b/modules/git/repo_commit.go
@@ -251,18 +251,18 @@ func (repo *Repository) CommitsByFileAndRange(opts CommitsByFileAndRangeOptions)
 		return nil, err
 	}
 
-	len := objectFormat.FullLength()
+	length := objectFormat.FullLength()
 	commits := []*Commit{}
-	shaline := make([]byte, len+1)
+	shaline := make([]byte, length+1)
 	for {
 		n, err := io.ReadFull(stdoutReader, shaline)
-		if err != nil || n < len {
+		if err != nil || n < length {
 			if err == io.EOF {
 				err = nil
 			}
 			return commits, err
 		}
-		objectID, err := NewIDFromString(string(shaline[0:len]))
+		objectID, err := NewIDFromString(string(shaline[0:length]))
 		if err != nil {
 			return nil, err
 		}
diff --git a/modules/git/submodule.go b/modules/git/submodule.go
index 37813ea4c7..b99c81582b 100644
--- a/modules/git/submodule.go
+++ b/modules/git/submodule.go
@@ -64,7 +64,6 @@ func getRefURL(refURL, urlPrefix, repoFullName, sshDomain string) string {
 		// ex: git@try.gitea.io:go-gitea/gitea
 		match := scpSyntax.FindAllStringSubmatch(refURI, -1)
 		if len(match) > 0 {
-
 			m := match[0]
 			refHostname := m[2]
 			pth := m[3]
diff --git a/modules/indexer/code/bleve/bleve.go b/modules/indexer/code/bleve/bleve.go
index c607d780ef..bd844205a6 100644
--- a/modules/indexer/code/bleve/bleve.go
+++ b/modules/indexer/code/bleve/bleve.go
@@ -191,7 +191,6 @@ func (b *Indexer) addDelete(filename string, repo *repo_model.Repository, batch
 func (b *Indexer) Index(ctx context.Context, repo *repo_model.Repository, sha string, changes *internal.RepoChanges) error {
 	batch := inner_bleve.NewFlushingBatch(b.inner.Indexer, maxBatchSize)
 	if len(changes.Updates) > 0 {
-
 		// Now because of some insanity with git cat-file not immediately failing if not run in a valid git directory we need to run git rev-parse first!
 		if err := git.EnsureValidGitRepository(ctx, repo.RepoPath()); err != nil {
 			log.Error("Unable to open git repo: %s for %-v: %v", repo.RepoPath(), repo, err)
@@ -335,7 +334,6 @@ func (b *Indexer) Search(ctx context.Context, opts *internal.SearchOptions) (int
 		if result, err = b.inner.Indexer.Search(facetRequest); err != nil {
 			return 0, nil, nil, err
 		}
-
 	}
 	languagesFacet := result.Facets["languages"]
 	for _, term := range languagesFacet.Terms.Terms() {
diff --git a/modules/indexer/issues/elasticsearch/elasticsearch.go b/modules/indexer/issues/elasticsearch/elasticsearch.go
index 53b383c8d5..c7cb59f2cf 100644
--- a/modules/indexer/issues/elasticsearch/elasticsearch.go
+++ b/modules/indexer/issues/elasticsearch/elasticsearch.go
@@ -145,7 +145,6 @@ func (b *Indexer) Search(ctx context.Context, options *internal.SearchOptions) (
 	query := elastic.NewBoolQuery()
 
 	if options.Keyword != "" {
-
 		searchType := esMultiMatchTypePhrasePrefix
 		if options.IsFuzzyKeyword {
 			searchType = esMultiMatchTypeBestFields
diff --git a/modules/log/event_format.go b/modules/log/event_format.go
index 524ca3dd87..d9dbebf831 100644
--- a/modules/log/event_format.go
+++ b/modules/log/event_format.go
@@ -125,7 +125,6 @@ func EventFormatTextMessage(mode *WriterMode, event *Event, msgFormat string, ms
 		if mode.Colorize {
 			buf = append(buf, resetBytes...)
 		}
-
 	}
 	if flags&(Lshortfile|Llongfile) != 0 {
 		if mode.Colorize {
diff --git a/modules/markup/markdown/markdown_test.go b/modules/markup/markdown/markdown_test.go
index d9b67e43af..bc6ad7fb3c 100644
--- a/modules/markup/markdown/markdown_test.go
+++ b/modules/markup/markdown/markdown_test.go
@@ -466,7 +466,6 @@ func TestColorPreview(t *testing.T) {
 		res, err := markdown.RenderString(&markup.RenderContext{Ctx: git.DefaultContext}, test.testcase)
 		assert.NoError(t, err, "Unexpected error in testcase: %q", test.testcase)
 		assert.Equal(t, template.HTML(test.expected), res, "Unexpected result in testcase %q", test.testcase)
-
 	}
 
 	negativeTests := []string{
@@ -549,7 +548,6 @@ func TestMathBlock(t *testing.T) {
 		res, err := markdown.RenderString(&markup.RenderContext{Ctx: git.DefaultContext}, test.testcase)
 		assert.NoError(t, err, "Unexpected error in testcase: %q", test.testcase)
 		assert.Equal(t, template.HTML(test.expected), res, "Unexpected result in testcase %q", test.testcase)
-
 	}
 }
 
diff --git a/modules/packages/rubygems/marshal.go b/modules/packages/rubygems/marshal.go
index 8878dcf973..4e6a5fc5f8 100644
--- a/modules/packages/rubygems/marshal.go
+++ b/modules/packages/rubygems/marshal.go
@@ -147,35 +147,35 @@ func (e *MarshalEncoder) marshalIntInternal(i int64) error {
 		return e.w.WriteByte(byte(i - 5))
 	}
 
-	var len int
+	var length int
 	if 122 < i && i <= 0xff {
-		len = 1
+		length = 1
 	} else if 0xff < i && i <= 0xffff {
-		len = 2
+		length = 2
 	} else if 0xffff < i && i <= 0xffffff {
-		len = 3
+		length = 3
 	} else if 0xffffff < i && i <= 0x3fffffff {
-		len = 4
+		length = 4
 	} else if -0x100 <= i && i < -123 {
-		len = -1
+		length = -1
 	} else if -0x10000 <= i && i < -0x100 {
-		len = -2
+		length = -2
 	} else if -0x1000000 <= i && i < -0x100000 {
-		len = -3
+		length = -3
 	} else if -0x40000000 <= i && i < -0x1000000 {
-		len = -4
+		length = -4
 	} else {
 		return ErrInvalidIntRange
 	}
 
-	if err := e.w.WriteByte(byte(len)); err != nil {
+	if err := e.w.WriteByte(byte(length)); err != nil {
 		return err
 	}
-	if len < 0 {
-		len = -len
+	if length < 0 {
+		length = -length
 	}
 
-	for c := 0; c < len; c++ {
+	for c := 0; c < length; c++ {
 		if err := e.w.WriteByte(byte(i >> uint(8*c) & 0xff)); err != nil {
 			return err
 		}
@@ -244,13 +244,13 @@ func (e *MarshalEncoder) marshalArray(arr reflect.Value) error {
 		return err
 	}
 
-	len := arr.Len()
+	length := arr.Len()
 
-	if err := e.marshalIntInternal(int64(len)); err != nil {
+	if err := e.marshalIntInternal(int64(length)); err != nil {
 		return err
 	}
 
-	for i := 0; i < len; i++ {
+	for i := 0; i < length; i++ {
 		if err := e.marshal(arr.Index(i).Interface()); err != nil {
 			return err
 		}
diff --git a/modules/process/manager_stacktraces.go b/modules/process/manager_stacktraces.go
index 49bd5071f6..e260893113 100644
--- a/modules/process/manager_stacktraces.go
+++ b/modules/process/manager_stacktraces.go
@@ -339,7 +339,6 @@ func (pm *Manager) ProcessStacktraces(flat, noSystem bool) ([]*Process, int, int
 	}
 	sort.Slice(processes, after(processes))
 	if !flat {
-
 		var sortChildren func(process *Process)
 
 		sortChildren = func(process *Process) {
diff --git a/modules/repository/temp.go b/modules/repository/temp.go
index 53646718e0..04faa9db3d 100644
--- a/modules/repository/temp.go
+++ b/modules/repository/temp.go
@@ -32,7 +32,6 @@ func CreateTemporaryPath(prefix string) (string, error) {
 	if err != nil {
 		log.Error("Unable to create temporary directory: %s-*.git (%v)", prefix, err)
 		return "", fmt.Errorf("Failed to create dir %s-*.git: %w", prefix, err)
-
 	}
 	return basePath, nil
 }
diff --git a/modules/setting/time.go b/modules/setting/time.go
index 6d2aa80f5b..39acba12ef 100644
--- a/modules/setting/time.go
+++ b/modules/setting/time.go
@@ -19,9 +19,8 @@ func loadTimeFrom(rootCfg ConfigProvider) {
 		DefaultUILocation, err = time.LoadLocation(zone)
 		if err != nil {
 			log.Fatal("Load time zone failed: %v", err)
-		} else {
-			log.Info("Default UI Location is %v", zone)
 		}
+		log.Info("Default UI Location is %v", zone)
 	}
 	if DefaultUILocation == nil {
 		DefaultUILocation = time.Local
diff --git a/modules/templates/htmlrenderer.go b/modules/templates/htmlrenderer.go
index 40941285aa..e7e805ed30 100644
--- a/modules/templates/htmlrenderer.go
+++ b/modules/templates/htmlrenderer.go
@@ -138,10 +138,9 @@ func wrapTmplErrMsg(msg string) {
 	if setting.IsProd {
 		// in prod mode, Gitea must have correct templates to run
 		log.Fatal("Gitea can't run with template errors: %s", msg)
-	} else {
-		// in dev mode, do not need to really exit, because the template errors could be fixed by developer soon and the templates get reloaded
-		log.Error("There are template errors but Gitea continues to run in dev mode: %s", msg)
 	}
+	// in dev mode, do not need to really exit, because the template errors could be fixed by developer soon and the templates get reloaded
+	log.Error("There are template errors but Gitea continues to run in dev mode: %s", msg)
 }
 
 type templateErrorPrettier struct {
diff --git a/modules/templates/mailer.go b/modules/templates/mailer.go
index f1832cba0e..7c97e1ea89 100644
--- a/modules/templates/mailer.go
+++ b/modules/templates/mailer.go
@@ -84,9 +84,8 @@ func Mailer(ctx context.Context) (*texttmpl.Template, *template.Template) {
 			if err = buildSubjectBodyTemplate(subjectTemplates, bodyTemplates, tmplName, content); err != nil {
 				if firstRun {
 					log.Fatal("Failed to parse mail template, err: %v", err)
-				} else {
-					log.Error("Failed to parse mail template, err: %v", err)
 				}
+				log.Error("Failed to parse mail template, err: %v", err)
 			}
 		}
 	}
diff --git a/modules/util/util_test.go b/modules/util/util_test.go
index 5c5b13d04b..de8f065cad 100644
--- a/modules/util/util_test.go
+++ b/modules/util/util_test.go
@@ -121,9 +121,9 @@ func Test_NormalizeEOL(t *testing.T) {
 }
 
 func Test_RandomInt(t *testing.T) {
-	int, err := CryptoRandomInt(255)
-	assert.True(t, int >= 0)
-	assert.True(t, int <= 255)
+	randInt, err := CryptoRandomInt(255)
+	assert.True(t, randInt >= 0)
+	assert.True(t, randInt <= 255)
 	assert.NoError(t, err)
 }