review

.golangci.example.yml

@@ -63,8 +63,8 @@ output:
   # colored-line-number|line-number|json|tab|checkstyle|code-climate|junit-xml|github-actions
   # default is "colored-line-number"
   # multiple can be specified by separating them by comma, output can be provided
-  # for each of them by separating format name and path by colon symbol. Output path can
-  # be either `stdout`, `stderr` or path to the file to write to.
+  # for each of them by separating format name and path by colon symbol.
+  # Output path can be either `stdout`, `stderr` or path to the file to write to.
   # Example "checkstyle:report.json,colored-line-number"
   format: colored-line-number
 

pkg/commands/run.go

@@ -26,6 +26,8 @@ import (
 	"github.com/golangci/golangci-lint/pkg/result/processors"
 )
 
+const defaultFileMode = 0644
+
 func getDefaultIssueExcludeHelp() string {
 	parts := []string{"Use or not use default excludes:"}
 	for _, ep := range config.DefaultExcludePatterns {
@@ -381,8 +383,6 @@ func (e *Executor) setExitCodeIfIssuesFound(issues []result.Issue) {
 	}
 }
 
-const defaultFileMode = 0644
-
 func (e *Executor) runAndPrint(ctx context.Context, args []string) error {
 	if err := e.goenv.Discover(ctx); err != nil {
 		e.log.Warnf("Failed to discover go env: %s", err)
@@ -408,27 +408,11 @@ func (e *Executor) runAndPrint(ctx context.Context, args []string) error {
 		if len(out) < 2 {
 			out = append(out, "")
 		}
-		w, shouldClose, err := e.createWriter(out[1])
-		if err != nil {
-			return fmt.Errorf("can't create output for %s: %w", out[1], err)
-		}
 
-		p, err := e.createPrinter(out[0], w)
+		err := e.printReports(ctx, issues, out[1], out[0])
 		if err != nil {
-			if file, ok := w.(io.Closer); shouldClose && ok {
-				file.Close()
-			}
 			return err
 		}
-		if err = p.Print(ctx, issues); err != nil {
-			if file, ok := w.(io.Closer); shouldClose && ok {
-				file.Close()
-			}
-			return fmt.Errorf("can't print %d issues: %s", len(issues), err)
-		}
-		if file, ok := w.(io.Closer); shouldClose && ok {
-			file.Close()
-		}
 	}
 
 	e.setExitCodeIfIssuesFound(issues)
@@ -438,6 +422,34 @@ func (e *Executor) runAndPrint(ctx context.Context, args []string) error {
 	return nil
 }
 
+func (e *Executor) printReports(ctx context.Context, issues []result.Issue, path, format string) error {
+	w, shouldClose, err := e.createWriter(path)
+	if err != nil {
+		return fmt.Errorf("can't create output for %s: %w", path, err)
+	}
+
+	p, err := e.createPrinter(format, w)
+	if err != nil {
+		if file, ok := w.(io.Closer); shouldClose && ok {
+			_ = file.Close()
+		}
+		return err
+	}
+
+	if err = p.Print(ctx, issues); err != nil {
+		if file, ok := w.(io.Closer); shouldClose && ok {
+			_ = file.Close()
+		}
+		return fmt.Errorf("can't print %d issues: %s", len(issues), err)
+	}
+
+	if file, ok := w.(io.Closer); shouldClose && ok {
+		_ = file.Close()
+	}
+
+	return nil
+}
+
 func (e *Executor) createWriter(path string) (io.Writer, bool, error) {
 	if path == "" || path == "stdout" {
 		return logutils.StdOut, false, nil

pkg/printers/checkstyle.go

@@ -37,9 +37,7 @@ type Checkstyle struct {
 }
 
 func NewCheckstyle(w io.Writer) *Checkstyle {
-	return &Checkstyle{
-		w: w,
-	}
+	return &Checkstyle{w: w}
 }
 
 func (p Checkstyle) Print(ctx context.Context, issues []result.Issue) error {
@@ -86,6 +84,10 @@ func (p Checkstyle) Print(ctx context.Context, issues []result.Issue) error {
 		return err
 	}
 
-	fmt.Fprintf(p.w, "%s%s\n", xml.Header, xmlfmt.FormatXML(string(data), "", "  "))
+	_, err = fmt.Fprintf(p.w, "%s%s\n", xml.Header, xmlfmt.FormatXML(string(data), "", "  "))
+	if err != nil {
+		return err
+	}
+
 	return nil
 }

pkg/printers/codeclimate.go

@@ -28,9 +28,7 @@ type CodeClimate struct {
 }
 
 func NewCodeClimate(w io.Writer) *CodeClimate {
-	return &CodeClimate{
-		w: w,
-	}
+	return &CodeClimate{w: w}
 }
 
 func (p CodeClimate) Print(ctx context.Context, issues []result.Issue) error {
@@ -55,6 +53,9 @@ func (p CodeClimate) Print(ctx context.Context, issues []result.Issue) error {
 		return err
 	}
 
-	fmt.Fprint(p.w, string(outputJSON))
+	_, err = fmt.Fprint(p.w, string(outputJSON))
+	if err != nil {
+		return err
+	}
 	return nil
 }

pkg/printers/github.go

@@ -17,9 +17,7 @@ const defaultGithubSeverity = "error"
 // NewGithub output format outputs issues according to GitHub actions format:
 // https://help.github.com/en/actions/reference/workflow-commands-for-github-actions#setting-an-error-message
 func NewGithub(w io.Writer) Printer {
-	return &github{
-		w: w,
-	}
+	return &github{w: w}
 }
 
 // print each line as: ::error file=app.js,line=10,col=15::Something went wrong

pkg/printers/html.go

@@ -128,9 +128,7 @@ type HTML struct {
 }
 
 func NewHTML(w io.Writer) *HTML {
-	return &HTML{
-		w: w,
-	}
+	return &HTML{w: w}
 }
 
 func (p HTML) Print(_ context.Context, issues []result.Issue) error {

pkg/printers/json.go

@@ -3,7 +3,6 @@ package printers
 import (
 	"context"
 	"encoding/json"
-	"fmt"
 	"io"
 
 	"github.com/golangci/golangci-lint/pkg/report"
@@ -36,11 +35,5 @@ func (p JSON) Print(ctx context.Context, issues []result.Issue) error {
 		res.Issues = []result.Issue{}
 	}
 
-	outputJSON, err := json.Marshal(res)
-	if err != nil {
-		return err
-	}
-
-	fmt.Fprint(p.w, string(outputJSON))
-	return nil
+	return json.NewEncoder(p.w).Encode(res)
 }

pkg/printers/junitxml.go

@@ -39,9 +39,7 @@ type JunitXML struct {
 }
 
 func NewJunitXML(w io.Writer) *JunitXML {
-	return &JunitXML{
-		w: w,
-	}
+	return &JunitXML{w: w}
 }
 
 func (p JunitXML) Print(ctx context.Context, issues []result.Issue) error {