revive: add revive.toml for linting revive itself (#1094)

Author: alexandear

.github/workflows/lint.yaml

@@ -16,3 +16,5 @@ jobs:
 
     - name: Run Revive Action
       uses: morphy2k/revive-action@v2
+      with:
+        config: revive.toml

lint/package.go

@@ -166,17 +166,17 @@ func (p *Package) scanSortable() {
 
 	// bitfield for which methods exist on each type.
 	const (
-		Len = 1 << iota
-		Less
-		Swap
+		bfLen = 1 << iota
+		bfLess
+		bfSwap
 	)
-	nmap := map[string]int{"Len": Len, "Less": Less, "Swap": Swap}
+	nmap := map[string]int{"Len": bfLen, "Less": bfLess, "Swap": bfSwap}
 	has := make(map[string]int)
 	for _, f := range p.files {
 		ast.Walk(&walker{nmap, has}, f.AST)
 	}
 	for typ, ms := range has {
-		if ms == Len|Less|Swap {
+		if ms == bfLen|bfLess|bfSwap {
 			p.sortable[typ] = true
 		}
 	}

revive.toml

@@ -0,0 +1,38 @@
+# This configuration for the revive linter used for linting the revive's codebase itself.
+# See .github/workflows/lint.yaml.
+
+ignoreGeneratedHeader = false
+severity = "warning"
+confidence = 0.8
+errorCode = 1
+warningCode = 1
+
+[rule.bare-return]
+[rule.blank-imports]
+[rule.context-as-argument]
+[rule.context-keys-type]
+[rule.dot-imports]
+[rule.empty-block]
+[rule.empty-lines]
+[rule.error-naming]
+[rule.error-return]
+[rule.error-strings]
+[rule.errorf]
+[rule.exported]
+[rule.increment-decrement]
+[rule.indent-error-flow]
+[rule.line-length-limit]
+    arguments = [200]
+[rule.package-comments]
+[rule.range]
+[rule.receiver-naming]
+[rule.redefines-builtin-id]
+[rule.superfluous-else]
+[rule.time-naming]
+[rule.unexported-naming]
+[rule.unexported-return]
+[rule.unreachable-code]
+[rule.unused-parameter]
+[rule.useless-break]
+[rule.var-declaration]
+[rule.var-naming]

rule/add-constant.go

@@ -160,14 +160,14 @@ func (w *lintAddConstantRule) isIgnoredFunc(fName string) bool {
 }
 
 func (w *lintAddConstantRule) checkStrLit(n *ast.BasicLit) {
-	const IgnoreMarker = -1
+	const ignoreMarker = -1
 
 	if w.allowList[kindSTRING][n.Value] {
 		return
 	}
 
 	count := w.strLits[n.Value]
-	mustCheck := count > IgnoreMarker
+	mustCheck := count > ignoreMarker
 	if mustCheck {
 		w.strLits[n.Value] = count + 1
 		if w.strLits[n.Value] > w.strLitLimit {

rule/comments-density.go

@@ -53,7 +53,8 @@ func (r *CommentsDensityRule) Apply(file *lint.File, arguments lint.Arguments) [
 			{
 				Node:       file.AST,
 				Confidence: 1,
-				Failure:    fmt.Sprintf("the file has a comment density of %2.f%% (%d comment lines for %d code lines) but expected a minimum of %d%%", density, commentsLines, statementsCount, r.minimumCommentsDensity),
+				Failure: fmt.Sprintf("the file has a comment density of %2.f%% (%d comment lines for %d code lines) but expected a minimum of %d%%",
+					density, commentsLines, statementsCount, r.minimumCommentsDensity),
 			},
 		}
 	}

rule/early-return.go

@@ -21,27 +21,27 @@ func (*EarlyReturnRule) Name() string {
 	return "early-return"
 }
 
-// CheckIfElse evaluates the rule against an ifelse.Chain.
-func (*EarlyReturnRule) CheckIfElse(chain ifelse.Chain, args ifelse.Args) (failMsg string) {
+// CheckIfElse evaluates the rule against an ifelse.Chain and returns a failure message if applicable.
+func (*EarlyReturnRule) CheckIfElse(chain ifelse.Chain, args ifelse.Args) string {
 	if !chain.Else.Deviates() {
 		// this rule only applies if the else-block deviates control flow
-		return
+		return ""
 	}
 
 	if chain.HasPriorNonDeviating && !chain.If.IsEmpty() {
 		// if we de-indent this block then a previous branch
 		// might flow into it, affecting program behaviour
-		return
+		return ""
 	}
 
 	if chain.If.Deviates() {
 		// avoid overlapping with superfluous-else
-		return
+		return ""
 	}
 
 	if args.PreserveScope && !chain.AtBlockEnd && (chain.HasInitializer || chain.If.HasDecls) {
 		// avoid increasing variable scope
-		return
+		return ""
 	}
 
 	if chain.If.IsEmpty() {

rule/filename-format.go

@@ -25,7 +25,7 @@ func (r *FilenameFormatRule) Apply(file *lint.File, arguments lint.Arguments) []
 		return nil
 	}
 
-	failureMsg := fmt.Sprintf("Filename %s is not of the format %s.%s", filename, r.format.String(), r.getMsgForNonAsciiChars(filename))
+	failureMsg := fmt.Sprintf("Filename %s is not of the format %s.%s", filename, r.format.String(), r.getMsgForNonASCIIChars(filename))
 	return []lint.Failure{{
 		Confidence: 1,
 		Failure:    failureMsg,
@@ -34,7 +34,7 @@ func (r *FilenameFormatRule) Apply(file *lint.File, arguments lint.Arguments) []
 	}}
 }
 
-func (r *FilenameFormatRule) getMsgForNonAsciiChars(str string) string {
+func (r *FilenameFormatRule) getMsgForNonASCIIChars(str string) string {
 	result := ""
 	for _, c := range str {
 		if c <= unicode.MaxASCII {

rule/indent-error-flow.go

@@ -18,27 +18,27 @@ func (*IndentErrorFlowRule) Name() string {
 	return "indent-error-flow"
 }
 
-// CheckIfElse evaluates the rule against an ifelse.Chain.
-func (*IndentErrorFlowRule) CheckIfElse(chain ifelse.Chain, args ifelse.Args) (failMsg string) {
+// CheckIfElse evaluates the rule against an ifelse.Chain and returns a failure message if applicable.
+func (*IndentErrorFlowRule) CheckIfElse(chain ifelse.Chain, args ifelse.Args) string {
 	if !chain.If.Deviates() {
 		// this rule only applies if the if-block deviates control flow
-		return
+		return ""
 	}
 
 	if chain.HasPriorNonDeviating {
 		// if we de-indent the "else" block then a previous branch
 		// might flow into it, affecting program behaviour
-		return
+		return ""
 	}
 
 	if !chain.If.Returns() {
 		// avoid overlapping with superfluous-else
-		return
+		return ""
 	}
 
 	if args.PreserveScope && !chain.AtBlockEnd && (chain.HasInitializer || chain.Else.HasDecls) {
 		// avoid increasing variable scope
-		return
+		return ""
 	}
 
 	return "if block ends with a return statement, so drop this else and outdent its block"

rule/superfluous-else.go

@@ -2,6 +2,7 @@ package rule
 
 import (
 	"fmt"
+
 	"github.com/mgechev/revive/internal/ifelse"
 	"github.com/mgechev/revive/lint"
 )
@@ -19,27 +20,27 @@ func (*SuperfluousElseRule) Name() string {
 	return "superfluous-else"
 }
 
-// CheckIfElse evaluates the rule against an ifelse.Chain.
-func (*SuperfluousElseRule) CheckIfElse(chain ifelse.Chain, args ifelse.Args) (failMsg string) {
+// CheckIfElse evaluates the rule against an ifelse.Chain and returns a failure message if applicable.
+func (*SuperfluousElseRule) CheckIfElse(chain ifelse.Chain, args ifelse.Args) string {
 	if !chain.If.Deviates() {
 		// this rule only applies if the if-block deviates control flow
-		return
+		return ""
 	}
 
 	if chain.HasPriorNonDeviating {
 		// if we de-indent the "else" block then a previous branch
 		// might flow into it, affecting program behaviour
-		return
+		return ""
 	}
 
 	if chain.If.Returns() {
 		// avoid overlapping with indent-error-flow
-		return
+		return ""
 	}
 
 	if args.PreserveScope && !chain.AtBlockEnd && (chain.HasInitializer || chain.Else.HasDecls) {
 		// avoid increasing variable scope
-		return
+		return ""
 	}
 
 	return fmt.Sprintf("if block ends with %v, so drop this else and outdent its block", chain.If.LongString())

test/utils_test.go

@@ -173,7 +173,6 @@ func parseInstructions(t *testing.T, filename string, src []byte) []instruction
 					t.Fatalf("At %v:%d: %v", filename, ln, err)
 				}
 				ins = append(ins, jsonInst)
-				break
 			case "classic":
 				match, err := extractPattern(line)
 				if err != nil {
@@ -198,9 +197,7 @@ func parseInstructions(t *testing.T, filename string, src []byte) []instruction
 					Match:       match,
 					Replacement: repl,
 				})
-				break
 			}
-
 		}
 	}
 	return ins