feat: add log

pkg/logutils/logutils.go

@@ -36,8 +36,12 @@ const (
 
 // Printers.
 const (
-	DebugKeyTabPrinter  = "tab_printer"
-	DebugKeyTextPrinter = "text_printer"
+	DebugKeyCheckstylePrinter  = "checkstyle_printer"
+	DebugKeyCodeClimatePrinter = "codeclimate_printer"
+	DebugKeySarifPrinter       = "sarif_printer"
+	DebugKeyTabPrinter         = "tab_printer"
+	DebugKeyTeamCityPrinter    = "teamcity_printer"
+	DebugKeyTextPrinter        = "text_printer"
 )
 
 // Processors.

pkg/printers/checkstyle.go

@@ -9,6 +9,7 @@ import (
 	"github.com/go-xmlfmt/xmlfmt"
 	"golang.org/x/exp/maps"
 
+	"github.com/golangci/golangci-lint/pkg/logutils"
 	"github.com/golangci/golangci-lint/pkg/result"
 )
 
@@ -21,10 +22,11 @@ type Checkstyle struct {
 	sanitizer severitySanitizer
 }
 
-func NewCheckstyle(w io.Writer) *Checkstyle {
+func NewCheckstyle(log logutils.Log, w io.Writer) *Checkstyle {
 	return &Checkstyle{
 		w: w,
 		sanitizer: severitySanitizer{
+			log: log.Child(logutils.DebugKeyCheckstylePrinter),
 			// https://checkstyle.org/config.html#Severity
 			// https://checkstyle.org/property_types.html#SeverityLevel
 			allowedSeverities: []string{"ignore", "info", "warning", defaultCheckstyleSeverity},

pkg/printers/checkstyle_test.go

@@ -9,6 +9,7 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
+	"github.com/golangci/golangci-lint/pkg/logutils"
 	"github.com/golangci/golangci-lint/pkg/result"
 )
 
@@ -41,15 +42,67 @@ func TestCheckstyle_Print(t *testing.T) {
 				Column:   9,
 			},
 		},
+		{
+			FromLinter: "linter-c",
+			Severity:   "",
+			Text:       "without severity",
+			SourceLines: []string{
+				"func foo() {",
+				"\tfmt.Println(\"bar\")",
+				"}",
+			},
+			Pos: token.Position{
+				Filename: "path/to/filec.go",
+				Offset:   5,
+				Line:     300,
+				Column:   10,
+			},
+		},
+		{
+			FromLinter: "linter-d",
+			Severity:   "foo",
+			Text:       "unknown severity",
+			SourceLines: []string{
+				"func foo() {",
+				"\tfmt.Println(\"bar\")",
+				"}",
+			},
+			Pos: token.Position{
+				Filename: "path/to/filed.go",
+				Offset:   5,
+				Line:     300,
+				Column:   11,
+			},
+		},
 	}
 
 	buf := new(bytes.Buffer)
-	printer := NewCheckstyle(buf)
+
+	log := logutils.NewStderrLog(logutils.DebugKeyEmpty)
+	log.SetLevel(logutils.LogLevelDebug)
+
+	printer := NewCheckstyle(log, buf)
 
 	err := printer.Print(issues)
 	require.NoError(t, err)
 
-	expected := "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n\n<checkstyle version=\"5.0\">\n  <file name=\"path/to/filea.go\">\n    <error column=\"4\" line=\"10\" message=\"some issue\" severity=\"warning\" source=\"linter-a\"></error>\n  </file>\n  <file name=\"path/to/fileb.go\">\n    <error column=\"9\" line=\"300\" message=\"another issue\" severity=\"error\" source=\"linter-b\"></error>\n  </file>\n</checkstyle>\n"
+	expected := `<?xml version="1.0" encoding="UTF-8"?>
+
+<checkstyle version="5.0">
+  <file name="path/to/filea.go">
+    <error column="4" line="10" message="some issue" severity="warning" source="linter-a"></error>
+  </file>
+  <file name="path/to/fileb.go">
+    <error column="9" line="300" message="another issue" severity="error" source="linter-b"></error>
+  </file>
+  <file name="path/to/filec.go">
+    <error column="10" line="300" message="without severity" severity="error" source="linter-c"></error>
+  </file>
+  <file name="path/to/filed.go">
+    <error column="11" line="300" message="unknown severity" severity="error" source="linter-d"></error>
+  </file>
+</checkstyle>
+`
 
 	assert.Equal(t, expected, strings.ReplaceAll(buf.String(), "\r", ""))
 }

pkg/printers/codeclimate.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"io"
 
+	"github.com/golangci/golangci-lint/pkg/logutils"
 	"github.com/golangci/golangci-lint/pkg/result"
 )
 
@@ -16,10 +17,11 @@ type CodeClimate struct {
 	sanitizer severitySanitizer
 }
 
-func NewCodeClimate(w io.Writer) *CodeClimate {
+func NewCodeClimate(log logutils.Log, w io.Writer) *CodeClimate {
 	return &CodeClimate{
 		w: w,
 		sanitizer: severitySanitizer{
+			log: log.Child(logutils.DebugKeyCodeClimatePrinter),
 			// https://github.com/codeclimate/platform/blob/master/spec/analyzers/SPEC.md#data-types
 			allowedSeverities: []string{"info", "minor", "major", defaultCodeClimateSeverity, "blocker"},
 			defaultSeverity:   defaultCodeClimateSeverity,

pkg/printers/codeclimate_test.go

@@ -8,14 +8,15 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
+	"github.com/golangci/golangci-lint/pkg/logutils"
 	"github.com/golangci/golangci-lint/pkg/result"
 )
 
 func TestCodeClimate_Print(t *testing.T) {
 	issues := []result.Issue{
 		{
 			FromLinter: "linter-a",
-			Severity:   "warning",
+			Severity:   "minor",
 			Text:       "some issue",
 			Pos: token.Position{
 				Filename: "path/to/filea.go",
@@ -42,28 +43,49 @@ func TestCodeClimate_Print(t *testing.T) {
 		},
 		{
 			FromLinter: "linter-c",
-			Text:       "issue c",
+			Severity:   "",
+			Text:       "without severity",
 			SourceLines: []string{
 				"func foo() {",
-				"\tfmt.Println(\"ccc\")",
+				"\tfmt.Println(\"bar\")",
 				"}",
 			},
 			Pos: token.Position{
 				Filename: "path/to/filec.go",
-				Offset:   6,
-				Line:     200,
-				Column:   2,
+				Offset:   5,
+				Line:     300,
+				Column:   10,
+			},
+		},
+		{
+			FromLinter: "linter-d",
+			Severity:   "foo",
+			Text:       "unknown severity",
+			SourceLines: []string{
+				"func foo() {",
+				"\tfmt.Println(\"bar\")",
+				"}",
+			},
+			Pos: token.Position{
+				Filename: "path/to/filed.go",
+				Offset:   5,
+				Line:     300,
+				Column:   11,
 			},
 		},
 	}
 
 	buf := new(bytes.Buffer)
-	printer := NewCodeClimate(buf)
+
+	log := logutils.NewStderrLog(logutils.DebugKeyEmpty)
+	log.SetLevel(logutils.LogLevelDebug)
+
+	printer := NewCodeClimate(log, buf)
 
 	err := printer.Print(issues)
 	require.NoError(t, err)
 
-	expected := `[{"description":"linter-a: some issue","check_name":"linter-a","severity":"critical","fingerprint":"BA73C5DF4A6FD8462FFF1D3140235777","location":{"path":"path/to/filea.go","lines":{"begin":10}}},{"description":"linter-b: another issue","check_name":"linter-b","severity":"major","fingerprint":"0777B4FE60242BD8B2E9B7E92C4B9521","location":{"path":"path/to/fileb.go","lines":{"begin":300}}},{"description":"linter-c: issue c","check_name":"linter-c","severity":"critical","fingerprint":"BEE6E9FBB6BFA4B7DB9FB036697FB036","location":{"path":"path/to/filec.go","lines":{"begin":200}}}]
+	expected := `[{"description":"linter-a: some issue","check_name":"linter-a","severity":"minor","fingerprint":"BA73C5DF4A6FD8462FFF1D3140235777","location":{"path":"path/to/filea.go","lines":{"begin":10}}},{"description":"linter-b: another issue","check_name":"linter-b","severity":"major","fingerprint":"0777B4FE60242BD8B2E9B7E92C4B9521","location":{"path":"path/to/fileb.go","lines":{"begin":300}}},{"description":"linter-c: without severity","check_name":"linter-c","severity":"critical","fingerprint":"84F89700554F16CCEB6C0BB481B44AD2","location":{"path":"path/to/filec.go","lines":{"begin":300}}},{"description":"linter-d: unknown severity","check_name":"linter-d","severity":"critical","fingerprint":"340BB02E7B583B9727D73765CB64F56F","location":{"path":"path/to/filed.go","lines":{"begin":300}}}]
 `
 
 	assert.Equal(t, expected, buf.String())

pkg/printers/json.go

@@ -14,7 +14,7 @@ type JSON struct {
 	w  io.Writer
 }
 
-func NewJSON(rd *report.Data, w io.Writer) *JSON {
+func NewJSON(w io.Writer, rd *report.Data) *JSON {
 	return &JSON{
 		rd: rd,
 		w:  w,

pkg/printers/json_test.go

@@ -44,7 +44,7 @@ func TestJSON_Print(t *testing.T) {
 
 	buf := new(bytes.Buffer)
 
-	printer := NewJSON(nil, buf)
+	printer := NewJSON(buf, nil)
 
 	err := printer.Print(issues)
 	require.NoError(t, err)

pkg/printers/junitxml.go

@@ -21,7 +21,7 @@ type JunitXML struct {
 	w        io.Writer
 }
 
-func NewJunitXML(extended bool, w io.Writer) *JunitXML {
+func NewJunitXML(w io.Writer, extended bool) *JunitXML {
 	return &JunitXML{
 		extended: extended,
 		w:        w,

pkg/printers/junitxml_test.go

@@ -105,7 +105,7 @@ Details: func foo() {
 			t.Parallel()
 
 			buf := new(bytes.Buffer)
-			printer := NewJunitXML(test.extended, buf)
+			printer := NewJunitXML(buf, test.extended)
 
 			err := printer.Print(issues)
 			require.NoError(t, err)

pkg/printers/printer.go

@@ -115,29 +115,25 @@ func (c *Printer) createPrinter(format string, w io.Writer) (issuePrinter, error
 
 	switch format {
 	case config.OutFormatJSON:
-		p = NewJSON(c.reportData, w)
+		p = NewJSON(w, c.reportData)
 	case config.OutFormatLineNumber, config.OutFormatColoredLineNumber:
-		p = NewText(c.cfg.PrintIssuedLine,
-			format == config.OutFormatColoredLineNumber, c.cfg.PrintLinterName,
-			c.log.Child(logutils.DebugKeyTextPrinter), w)
+		p = NewText(c.log, w, c.cfg.PrintLinterName, c.cfg.PrintIssuedLine, format == config.OutFormatColoredLineNumber)
 	case config.OutFormatTab, config.OutFormatColoredTab:
-		p = NewTab(c.cfg.PrintLinterName,
-			format == config.OutFormatColoredTab,
-			c.log.Child(logutils.DebugKeyTabPrinter), w)
+		p = NewTab(c.log, w, c.cfg.PrintLinterName, format == config.OutFormatColoredTab)
 	case config.OutFormatCheckstyle:
-		p = NewCheckstyle(w)
+		p = NewCheckstyle(c.log, w)
 	case config.OutFormatCodeClimate:
-		p = NewCodeClimate(w)
+		p = NewCodeClimate(c.log, w)
 	case config.OutFormatHTML:
 		p = NewHTML(w)
 	case config.OutFormatJunitXML, config.OutFormatJunitXMLExtended:
-		p = NewJunitXML(format == config.OutFormatJunitXMLExtended, w)
+		p = NewJunitXML(w, format == config.OutFormatJunitXMLExtended)
 	case config.OutFormatGithubActions:
 		p = NewGitHubAction(w)
 	case config.OutFormatTeamCity:
-		p = NewTeamCity(w)
+		p = NewTeamCity(c.log, w)
 	case config.OutFormatSarif:
-		p = NewSarif(w)
+		p = NewSarif(c.log, w)
 	default:
 		return nil, fmt.Errorf("unknown output format %q", format)
 	}
@@ -146,6 +142,8 @@ func (c *Printer) createPrinter(format string, w io.Writer) (issuePrinter, error
 }
 
 type severitySanitizer struct {
+	log logutils.Log
+
 	allowedSeverities []string
 	defaultSeverity   string
 }
@@ -155,5 +153,7 @@ func (s *severitySanitizer) Clean(severity string) string {
 		return severity
 	}
 
+	s.log.Infof("severity '%s' is not inside %v, fallback to %s", severity, s.allowedSeverities, s.defaultSeverity)
+
 	return s.defaultSeverity
 }

pkg/printers/sarif.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"io"
 
+	"github.com/golangci/golangci-lint/pkg/logutils"
 	"github.com/golangci/golangci-lint/pkg/result"
 )
 
@@ -22,10 +23,11 @@ type Sarif struct {
 	sanitizer severitySanitizer
 }
 
-func NewSarif(w io.Writer) *Sarif {
+func NewSarif(log logutils.Log, w io.Writer) *Sarif {
 	return &Sarif{
 		w: w,
 		sanitizer: severitySanitizer{
+			log: log.Child(logutils.DebugKeySarifPrinter),
 			// https://docs.oasis-open.org/sarif/sarif/v2.1.0/errata01/os/sarif-v2.1.0-errata01-os-complete.html#_Toc141790898
 			allowedSeverities: []string{"none", "note", "warning", defaultSarifSeverity},
 			defaultSeverity:   defaultSarifSeverity,