revive: the default configuration is only applied when no dedicated c…

…onfiguration. (#1831)

pkg/golinters/revive.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"go/token"
 	"io/ioutil"
+	"reflect"
 
 	"github.com/BurntSushi/toml"
 	"github.com/mgechev/dots"
@@ -136,20 +137,22 @@ func NewRevive(cfg *config.ReviveSettings) *goanalysis.Linter {
 // https://github.com/golangci/golangci-lint/issues/1745
 // https://github.com/mgechev/revive/blob/389ba853b0b3587f0c3b71b5f0c61ea4e23928ec/config/config.go#L155
 func getReviveConfig(cfg *config.ReviveSettings) (*lint.Config, error) {
-	rawRoot := createConfigMap(cfg)
-
-	buf := bytes.NewBuffer(nil)
+	conf := defaultConfig()
 
-	err := toml.NewEncoder(buf).Encode(rawRoot)
-	if err != nil {
-		return nil, err
-	}
+	if !reflect.DeepEqual(cfg, &config.ReviveSettings{}) {
+		rawRoot := createConfigMap(cfg)
+		buf := bytes.NewBuffer(nil)
 
-	conf := defaultConfig()
+		err := toml.NewEncoder(buf).Encode(rawRoot)
+		if err != nil {
+			return nil, err
+		}
 
-	_, err = toml.DecodeReader(buf, conf)
-	if err != nil {
-		return nil, err
+		conf = &lint.Config{}
+		_, err = toml.DecodeReader(buf, conf)
+		if err != nil {
+			return nil, err
+		}
 	}
 
 	normalizeConfig(conf)

test/testdata/configs/revive.yml

@@ -3,12 +3,10 @@ linters-settings:
     ignore-generated-header: true
     severity: warning
     rules:
-      - name: indent-error-flow
-        severity: warning
       - name: cognitive-complexity
         arguments: [ 7 ]
       - name: line-length-limit
-        arguments: [ 110 ]
+        arguments: [ 130 ]
       - name: function-result-limit
         arguments: [ 3 ]
       - name: argument-limit

test/testdata/revive.go

@@ -2,12 +2,29 @@
 //config_path: testdata/configs/revive.yml
 package testdata
 
-import "time"
+import (
+	"net/http"
+	"time"
+)
 
 func testRevive(t *time.Duration) error {
 	if t == nil {
 		return nil
-	} else { // ERROR "indent-error-flow: if block ends with a return statement, .*"
+	} else {
 		return nil
 	}
 }
+
+func testReviveComplexity(s string) { // ERROR "cyclomatic: function testReviveComplexity has cyclomatic complexity 22"
+	if s == http.MethodGet || s == "2" || s == "3" || s == "4" || s == "5" || s == "6" || s == "7" {
+		return
+	}
+
+	if s == "1" || s == "2" || s == "3" || s == "4" || s == "5" || s == "6" || s == "7" {
+		return
+	}
+
+	if s == "1" || s == "2" || s == "3" || s == "4" || s == "5" || s == "6" || s == "7" {
+		return
+	}
+}

test/testdata/revive_default.go

@@ -0,0 +1,29 @@
+//args: -Erevive
+package testdata
+
+import (
+	"net/http"
+	"time"
+)
+
+func testReviveDefault(t *time.Duration) error {
+	if t == nil {
+		return nil
+	} else { // ERROR "indent-error-flow: if block ends with a return statement, .*"
+		return nil
+	}
+}
+
+func testReviveComplexityDefault(s string) {
+	if s == http.MethodGet || s == "2" || s == "3" || s == "4" || s == "5" || s == "6" || s == "7" {
+		return
+	}
+
+	if s == "1" || s == "2" || s == "3" || s == "4" || s == "5" || s == "6" || s == "7" {
+		return
+	}
+
+	if s == "1" || s == "2" || s == "3" || s == "4" || s == "5" || s == "6" || s == "7" {
+		return
+	}
+}