dev: displays revive rules inside debug logs (golangci#5325)

Co-authored-by: Fernandez Ludovic <ldez@users.noreply.github.com>

Author: ccoVeille

.golangci.next.reference.yml

@@ -2371,7 +2371,7 @@ linters-settings:
     # This means that linting errors with less than 0.8 confidence will be ignored.
     # Default: 0.8
     confidence: 0.1
-
+    # Run `GL_DEBUG=revive golangci-lint run --enable-only=revive` to see default, all available rules, and enabled rules.
     rules:
       # https://github.com/mgechev/revive/blob/master/RULES_DESCRIPTIONS.md#add-constant
       - name: add-constant

pkg/golinters/revive/revive.go

@@ -8,6 +8,8 @@ import (
 	"go/token"
 	"os"
 	"reflect"
+	"slices"
+	"strings"
 	"sync"
 
 	"github.com/BurntSushi/toml"
@@ -27,7 +29,10 @@ import (
 
 const linterName = "revive"
 
-var debugf = logutils.Debug(logutils.DebugKeyRevive)
+var (
+	debugf  = logutils.Debug(logutils.DebugKeyRevive)
+	isDebug = logutils.HaveDebugTag(logutils.DebugKeyRevive)
+)
 
 // jsonObject defines a JSON object of a failure
 type jsonObject struct {
@@ -91,6 +96,8 @@ func newWrapper(settings *config.ReviveSettings) (*wrapper, error) {
 		return nil, err
 	}
 
+	displayRules(conf)
+
 	conf.GoVersion, err = hcversion.NewVersion(settings.Go)
 	if err != nil {
 		return nil, err
@@ -236,8 +243,6 @@ func getConfig(cfg *config.ReviveSettings) (*lint.Config, error) {
 		conf.Rules[k] = r
 	}
 
-	debugf("revive configuration: %#v", conf)
-
 	return conf, nil
 }
 
@@ -447,3 +452,36 @@ func defaultConfig() *lint.Config {
 	}
 	return &defaultConfig
 }
+
+func displayRules(conf *lint.Config) {
+	if !isDebug {
+		return
+	}
+
+	var enabledRules []string
+	for k, r := range conf.Rules {
+		if !r.Disabled {
+			enabledRules = append(enabledRules, k)
+		}
+	}
+
+	slices.Sort(enabledRules)
+
+	debugf("All available rules (%d): %s.", len(allRules), strings.Join(extractRulesName(allRules), ", "))
+	debugf("Default rules (%d): %s.", len(allRules), strings.Join(extractRulesName(allRules), ", "))
+	debugf("Enabled by config rules (%d): %s.", len(enabledRules), strings.Join(enabledRules, ", "))
+
+	debugf("revive configuration: %#v", conf)
+}
+
+func extractRulesName(rules []lint.Rule) []string {
+	var names []string
+
+	for _, r := range rules {
+		names = append(names, r.Name())
+	}
+
+	slices.Sort(names)
+
+	return names
+}