chore: use @LINTER instead of @

Author: ldez

.golangci.reference.yml

@@ -2881,7 +2881,7 @@ severity:
   # - GitHub: https://help.github.com/en/actions/reference/workflow-commands-for-github-actions#setting-an-error-message
   # - TeamCity: https://www.jetbrains.com/help/teamcity/service-messages.html#Inspection+Instance
   #
-  # `@` can be used as severity value to keep the severity from linters (e.g. revive, gosec, ...)
+  # `@linter` can be used as severity value to keep the severity from linters (e.g. revive, gosec, ...)
   #
   # Default: ""
   default-severity: error
@@ -2894,7 +2894,7 @@ severity:
   # Severity rules have the same filtering capability as exclude rules
   # except you are allowed to specify one matcher per severity rule.
   #
-  # `@` can be used as severity value to keep the severity from linters (e.g. revive, gosec, ...)
+  # `@linter` can be used as severity value to keep the severity from linters (e.g. revive, gosec, ...)
   #
   # Only affects out formats that support setting severity information.
   #

pkg/result/processors/severity.go

@@ -8,6 +8,8 @@ import (
 	"github.com/golangci/golangci-lint/pkg/result"
 )
 
+const severityFromLinter = "@linter"
+
 var _ Processor = &Severity{}
 
 type severityRule struct {
@@ -69,7 +71,7 @@ func (p *Severity) transform(issue *result.Issue) *result.Issue {
 		rule := rule
 
 		if rule.match(issue, p.files, p.log) {
-			if rule.severity == "@" || rule.severity == "" && p.defaultSeverity == "@" {
+			if rule.severity == severityFromLinter || rule.severity == "" && p.defaultSeverity == severityFromLinter {
 				return issue
 			}
 
@@ -82,7 +84,7 @@ func (p *Severity) transform(issue *result.Issue) *result.Issue {
 		}
 	}
 
-	if p.defaultSeverity != "@" {
+	if p.defaultSeverity != severityFromLinter {
 		issue.Severity = p.defaultSeverity
 	}
 

pkg/result/processors/severity_test.go

@@ -421,7 +421,7 @@ func TestSeverity_transform(t *testing.T) {
 				Default: "error",
 				Rules: []SeverityRule{
 					{
-						Severity: "@",
+						Severity: severityFromLinter,
 						BaseRule: BaseRule{
 							Linters: []string{"linter1"},
 						},
@@ -442,7 +442,7 @@ func TestSeverity_transform(t *testing.T) {
 		{
 			desc: "keep severity from linter as default",
 			opts: SeverityOptions{
-				Default: "@",
+				Default: severityFromLinter,
 				Rules: []SeverityRule{
 					{
 						Severity: "info",
@@ -466,7 +466,7 @@ func TestSeverity_transform(t *testing.T) {
 		{
 			desc: "keep severity from linter as default (without rule)",
 			opts: SeverityOptions{
-				Default: "@",
+				Default: severityFromLinter,
 			},
 			issue: &result.Issue{
 				Text:       "This is a report",