another group of fixes after running on golang source code

internal/commands/run.go

@@ -86,6 +86,7 @@ func (e *Executor) initRun() {
 		fmt.Sprintf("Use or not use default excludes: (%s)", strings.Join(config.DefaultExcludePatterns, "|")))
 
 	runCmd.Flags().IntVar(&rc.MaxIssuesPerLinter, "max-issues-per-linter", 50, "Maximum issues count per one linter. Set to 0 to disable")
+	runCmd.Flags().IntVar(&rc.MaxSameIssues, "max-same-issues", 3, "Maximum count of issues with the same text. Set to 0 to disable")
 
 	runCmd.Flags().BoolVarP(&rc.Diff, "new", "n", false, "Show only new issues: if there are unstaged changes or untracked files, only those changes are shown, else only changes in HEAD~ are shown")
 	runCmd.Flags().StringVar(&rc.DiffFromRevision, "new-from-rev", "", "Show only new issues created after git revision `REV`")
@@ -225,6 +226,7 @@ func (e *Executor) runAnalysis(ctx context.Context, args []string) (chan result.
 			processors.NewDiff(e.cfg.Run.Diff, e.cfg.Run.DiffFromRevision, e.cfg.Run.DiffPatchFilePath),
 			processors.NewMaxPerFileFromLinter(),
 			processors.NewMaxFromLinter(e.cfg.Run.MaxIssuesPerLinter),
+			processors.NewMaxSameIssues(e.cfg.Run.MaxSameIssues),
 			processors.NewPathPrettifier(),
 		},
 	}

pkg/config/config.go

@@ -15,12 +15,21 @@ const (
 var OutFormats = []string{OutFormatColoredLineNumber, OutFormatLineNumber, OutFormatJSON}
 
 var DefaultExcludePatterns = []string{
-	"Error return value of `(os\\.Std(out|err)\\.Write|.*\\.Close)` is not checked",
+	// errcheck
+	"Error return value of .(os\\.Std(out|err)\\.*|.*\\.Close|std(out|err)\\..*|os\\.Remove(All)?|.*[pP]rintf?). is not checked",
+
+	// golint
 	"should have comment",
 	"comment on exported method",
-	"G104", // disable what errcheck does: it reports on Close etc
-	"G204", // Subprocess launching should be audited: too lot false positives
-	"G304", // Potential file inclusion via variable: `src, err := ioutil.ReadFile(filename)`
+
+	// gas
+	"G103:", // Use of unsafe calls should be audited
+	"G104:", // disable what errcheck does: it reports on Close etc
+	"G204:", // Subprocess launching should be audited: too lot false positives
+	"G304:", // Potential file inclusion via variable: `src, err := ioutil.ReadFile(filename)`
+
+	// govet
+	"possible misuse of unsafe.Pointer",
 }
 
 type Common struct {
@@ -92,6 +101,7 @@ type Run struct { // nolint:maligned
 	Deadline time.Duration
 
 	MaxIssuesPerLinter int
+	MaxSameIssues      int
 
 	DiffFromRevision  string
 	DiffPatchFilePath string

pkg/printers/text.go

@@ -75,6 +75,10 @@ func (p Text) Print(issues chan result.Issue) (bool, error) {
 
 		lineRange := i.GetLineRange()
 		for line := lineRange.From; line <= lineRange.To; line++ {
+			if line == 0 { // some linters, e.g. gas can do it: it really means first line
+				line = 1
+			}
+
 			zeroIndexedLine := line - 1
 			if zeroIndexedLine >= len(fc) {
 				logrus.Warnf("No line %d in file %s", line, i.FilePath())

pkg/result/processors/max_same_issues.go

@@ -0,0 +1,46 @@
+package processors
+
+import (
+	"github.com/golangci/golangci-lint/pkg/result"
+	"github.com/sirupsen/logrus"
+)
+
+type textToCountMap map[string]int
+
+type MaxSameIssues struct {
+	tc    textToCountMap
+	limit int
+}
+
+var _ Processor = &MaxSameIssues{}
+
+func NewMaxSameIssues(limit int) *MaxSameIssues {
+	return &MaxSameIssues{
+		tc:    textToCountMap{},
+		limit: limit,
+	}
+}
+
+func (MaxSameIssues) Name() string {
+	return "max_same_issues"
+}
+
+func (p *MaxSameIssues) Process(issues []result.Issue) ([]result.Issue, error) {
+	if p.limit <= 0 { // no limit
+		return issues, nil
+	}
+
+	return filterIssues(issues, func(i *result.Issue) bool {
+		p.tc[i.Text]++ // always inc for stat
+		return p.tc[i.Text] <= p.limit
+	}), nil
+}
+
+func (p MaxSameIssues) Finish() {
+	for text, count := range p.tc {
+		if count > p.limit {
+			logrus.Infof("%d/%d issues with text %q were hidden, use --max-same-issues",
+				count-p.limit, count, text)
+		}
+	}
+}

pkg/result/processors/max_same_issues_test.go

@@ -0,0 +1,21 @@
+package processors
+
+import (
+	"testing"
+
+	"github.com/golangci/golangci-lint/pkg/result"
+)
+
+func TestMaxSameIssues(t *testing.T) {
+	p := NewMaxSameIssues(1)
+	i1 := result.Issue{
+		Text: "1",
+	}
+	i2 := result.Issue{
+		Text: "2",
+	}
+
+	processAssertSame(t, p, i1)  // ok
+	processAssertSame(t, p, i2)  // ok: another
+	processAssertEmpty(t, p, i1) // skip
+}

pkg/result/processors/nolint.go

@@ -1,10 +1,13 @@
 package processors
 
 import (
+	"bufio"
+	"bytes"
 	"fmt"
 	"go/ast"
 	"go/parser"
 	"go/token"
+	"io/ioutil"
 	"strings"
 
 	"github.com/golangci/golangci-lint/pkg/result"
@@ -15,17 +18,21 @@ type comment struct {
 	line    int
 }
 type fileComments []comment
-type commentsCache map[string]fileComments
+type fileData struct {
+	comments    fileComments
+	isGenerated bool
+}
+type filesCache map[string]*fileData
 
 type Nolint struct {
 	fset  *token.FileSet
-	cache commentsCache
+	cache filesCache
 }
 
 func NewNolint(fset *token.FileSet) *Nolint {
 	return &Nolint{
 		fset:  fset,
-		cache: commentsCache{},
+		cache: filesCache{},
 	}
 }
 
@@ -39,19 +46,53 @@ func (p *Nolint) Process(issues []result.Issue) ([]result.Issue, error) {
 	return filterIssuesErr(issues, p.shouldPassIssue)
 }
 
+var (
+	genHdr = []byte("// Code generated ")
+	genFtr = []byte(" DO NOT EDIT.")
+)
+
+// isGenerated reports whether the source file is generated code
+// according the rules from https://golang.org/s/generatedcode.
+func isGenerated(src []byte) bool {
+	sc := bufio.NewScanner(bytes.NewReader(src))
+	for sc.Scan() {
+		b := sc.Bytes()
+		if bytes.HasPrefix(b, genHdr) && bytes.HasSuffix(b, genFtr) && len(b) >= len(genHdr)+len(genFtr) {
+			return true
+		}
+	}
+	return false
+}
+
 func (p *Nolint) shouldPassIssue(i *result.Issue) (bool, error) {
-	comments := p.cache[i.FilePath()]
-	if comments == nil {
-		file, err := parser.ParseFile(p.fset, i.FilePath(), nil, parser.ParseComments)
+	fd := p.cache[i.FilePath()]
+	if fd == nil {
+		fd = &fileData{}
+		p.cache[i.FilePath()] = fd
+
+		src, err := ioutil.ReadFile(i.FilePath())
+		if err != nil {
+			return false, fmt.Errorf("can't read file %s: %s", i.FilePath(), err)
+		}
+
+		fd.isGenerated = isGenerated(src)
+		if fd.isGenerated { // don't report issues for autogenerated files
+			return false, nil
+		}
+
+		file, err := parser.ParseFile(p.fset, i.FilePath(), src, parser.ParseComments)
 		if err != nil {
 			return false, fmt.Errorf("can't parse file %s", i.FilePath())
 		}
 
-		comments = extractFileComments(p.fset, file.Comments...)
-		p.cache[i.FilePath()] = comments
+		fd.comments = extractFileComments(p.fset, file.Comments...)
 	}
 
-	for _, comment := range comments {
+	if fd.isGenerated { // don't report issues for autogenerated files
+		return false, nil
+	}
+
+	for _, comment := range fd.comments {
 		if comment.line != i.Line() {
 			continue
 		}

pkg/result/processors/nolint_test.go

@@ -29,3 +29,14 @@ func TestNolint(t *testing.T) {
 
 	processAssertSame(t, p, newNolintFileIssue(1, "golint"))
 }
+
+func TestNoIssuesInAutogeneratedFile(t *testing.T) {
+	i := result.Issue{
+		Pos: token.Position{
+			Filename: filepath.Join("testdata", "nolint_autogenerated.go"),
+			Line:     4,
+		},
+	}
+	p := NewNolint(token.NewFileSet())
+	processAssertEmpty(t, p, i)
+}

pkg/result/processors/testdata/nolint_autogenerated.go

@@ -0,0 +1,4 @@
+// Code generated by ... DO NOT EDIT.
+package testdata
+
+var v int