Fix config initialisation

Allow setting confidence to 0

config/config.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"io/ioutil"
+	"math"
 
 	"github.com/mgechev/revive/formatter"
 
@@ -12,6 +13,10 @@ import (
 	"github.com/mgechev/revive/rule"
 )
 
+const (
+	defaultConfidence = 0.8
+)
+
 var defaultRules = []lint.Rule{
 	&rule.VarDeclarationsRule{},
 	&rule.PackageCommentsRule{},
@@ -129,7 +134,9 @@ func GetLintingRules(config *lint.Config) ([]lint.Rule, error) {
 }
 
 func parseConfig(path string) (*lint.Config, error) {
-	config := &lint.Config{}
+	config := &lint.Config{
+		Confidence: math.Inf(1),
+	}
 	file, err := ioutil.ReadFile(path)
 	if err != nil {
 		return nil, errors.New("cannot read the config file")
@@ -142,8 +149,7 @@ func parseConfig(path string) (*lint.Config, error) {
 }
 
 func normalizeConfig(config *lint.Config) {
-	const defaultConfidence = 0.8
-	if config.Confidence == 0 {
+	if config.Confidence == math.Inf(1) {
 		config.Confidence = defaultConfidence
 	}
 
@@ -210,7 +216,7 @@ func GetFormatter(formatterName string) (lint.Formatter, error) {
 
 func defaultConfig() *lint.Config {
 	defaultConfig := lint.Config{
-		Confidence: 0.0,
+		Confidence: math.Inf(1),
 		Severity:   lint.SeverityWarning,
 		Rules:      map[string]lint.RuleConfig{},
 	}

config/config_test.go

@@ -11,9 +11,10 @@ import (
 
 func TestGetConfig(t *testing.T) {
 	tt := map[string]struct {
-		confPath   string
-		wantConfig *lint.Config
-		wantError  string
+		confPath       string
+		wantConfig     *lint.Config
+		wantError      string
+		wantConfidence float64
 	}{
 		"non-reg issue #470": {
 			confPath:  "testdata/issue-470.toml",
@@ -33,6 +34,15 @@ func TestGetConfig(t *testing.T) {
 				normalizeConfig(c)
 				return c
 			}(),
+			wantConfidence: defaultConfidence,
+		},
+		"config from file issue #585": {
+			confPath:       "testdata/issue-585.toml",
+			wantConfidence: 0.0,
+		},
+		"config from file default confidence issue #585": {
+			confPath:       "testdata/issue-585-defaultConfidence.toml",
+			wantConfidence: defaultConfidence,
 		},
 	}
 
@@ -46,8 +56,9 @@ func TestGetConfig(t *testing.T) {
 				t.Fatalf("Expected error\n\t%q\ngot:\n\t%v", tc.wantError, err)
 			case tc.wantConfig != nil && !reflect.DeepEqual(cfg, tc.wantConfig):
 				t.Fatalf("Expected config\n\t%+v\ngot:\n\t%+v", tc.wantConfig, cfg)
+			case tc.wantConfig != nil && tc.wantConfidence != cfg.Confidence:
+				t.Fatalf("Expected confidence\n\t%+v\ngot:\n\t%+v", tc.wantConfidence, cfg.Confidence)
 			}
-
 		})
 	}
 }
@@ -88,7 +99,6 @@ func TestGetLintingRules(t *testing.T) {
 			case len(rules) != tc.wantRulesCount:
 				t.Fatalf("Expected %v enabled linting rules got: %v", tc.wantRulesCount, len(rules))
 			}
-
 		})
 	}
 }

config/testdata/issue-585-defaultConfidence.toml

@@ -0,0 +1,4 @@
+ignoreGeneratedHeader = false
+severity = "warning"
+errorCode = 0
+warningCode = 0

config/testdata/issue-585.toml

@@ -0,0 +1,5 @@
+ignoreGeneratedHeader = false
+severity = "warning"
+confidence = 0.0
+errorCode = 0
+warningCode = 0