support diff options

Gopkg.lock

@@ -11,12 +11,6 @@
   revision = "a9de4d6c1589158e002cc336c495bf11fbf3ea06"
   source = "github.com/golangci/gas"
 
-[[projects]]
-  name = "github.com/bradleyfalzon/revgrep"
-  packages = ["."]
-  revision = "c04006dc3307c8768bda7a33c7c15d1c6f664e14"
-  version = "v0.3"
-
 [[projects]]
   name = "github.com/davecgh/go-spew"
   packages = ["spew"]
@@ -121,6 +115,12 @@
   packages = ["."]
   revision = "b1d89398deca2fd3f8578e5a9551e819bd01ca5f"
 
+[[projects]]
+  branch = "master"
+  name = "github.com/golangci/revgrep"
+  packages = ["."]
+  revision = "dfd919b445ba350862d7a6e7fe81989000b84020"
+
 [[projects]]
   branch = "master"
   name = "github.com/golangci/unconvert"
@@ -296,6 +296,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "f77d7467814715b13829f36bfcd792b9d8e18c1194f44e41ba9967c2c4397374"
+  inputs-digest = "76708ccce918c7352a0a1ac338ffaae892409a10ef8c7cf23724bf56e7877caf"
   solver-name = "gps-cdcl"
   solver-version = 1

Gopkg.toml

@@ -26,8 +26,8 @@
 
 
 [[constraint]]
-  name = "github.com/bradleyfalzon/revgrep"
-  version = "0.3.0"
+  name = "github.com/golangci/revgrep"
+  branch = "master"
 
 [[constraint]]
   name = "github.com/stretchr/testify"

internal/commands/run.go

@@ -83,6 +83,10 @@ func (e *Executor) initRun() {
 	runCmd.Flags().StringSliceVarP(&rc.ExcludePatterns, "exclude", "e", config.DefaultExcludePatterns, "Exclude issue by regexp")
 
 	runCmd.Flags().IntVar(&rc.MaxIssuesPerLinter, "max-issues-per-linter", 50, "Maximum issues count per one linter. 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`")
+	runCmd.Flags().StringVar(&rc.DiffPatchFilePath, "new-from-patch", "", "Show only new issues created in git patch with file path `PATH`")
 }
 
 func isFullImportNeeded(linters []pkg.Linter) bool {
@@ -196,10 +200,11 @@ func (e *Executor) runAnalysis(ctx context.Context, args []string) (chan result.
 
 	runner := pkg.SimpleRunner{
 		Processors: []processors.Processor{
-			processors.NewMaxPerFileFromLinter(),
 			processors.NewExclude(fmt.Sprintf("(%s)", strings.Join(e.cfg.Run.ExcludePatterns, "|"))),
 			processors.NewNolint(lintCtx.Program.Fset),
 			processors.NewUniqByLine(),
+			processors.NewDiff(e.cfg.Run.Diff, e.cfg.Run.DiffFromRevision, e.cfg.Run.DiffPatchFilePath),
+			processors.NewMaxPerFileFromLinter(),
 			processors.NewMaxFromLinter(e.cfg.Run.MaxIssuesPerLinter),
 			processors.NewPathPrettifier(),
 		},

pkg/config/config.go

@@ -79,6 +79,10 @@ type Run struct {
 	Deadline time.Duration
 
 	MaxIssuesPerLinter int
+
+	DiffFromRevision  string
+	DiffPatchFilePath string
+	Diff              bool
 }
 
 type Config struct {

pkg/result/issue.go

@@ -8,6 +8,14 @@ type Issue struct {
 	HunkPos    int
 }
 
+func (i Issue) FilePath() string {
+	return i.File
+}
+
+func (i Issue) Line() int {
+	return i.LineNumber
+}
+
 func NewIssue(fromLinter, text, file string, lineNumber, hunkPos int) Issue {
 	return Issue{
 		FromLinter: fromLinter,

pkg/result/processors/diff.go

@@ -1,92 +1,66 @@
 package processors
 
 import (
+	"bytes"
 	"fmt"
+	"io"
 	"io/ioutil"
-	"strings"
 
-	"github.com/bradleyfalzon/revgrep"
 	"github.com/golangci/golangci-lint/pkg/result"
+	"github.com/golangci/revgrep"
 )
 
-type DiffProcessor struct {
-	patch string
+type Diff struct {
+	onlyNew       bool
+	fromRev       string
+	patchFilePath string
 }
 
-func NewDiffProcessor(patch string) *DiffProcessor {
-	return &DiffProcessor{
-		patch: patch,
+var _ Processor = Diff{}
+
+func NewDiff(onlyNew bool, fromRev, patchFilePath string) *Diff {
+	return &Diff{
+		onlyNew:       onlyNew,
+		fromRev:       fromRev,
+		patchFilePath: patchFilePath,
 	}
 }
 
-func (p DiffProcessor) Name() string {
+func (p Diff) Name() string {
 	return "diff"
 }
 
-func (p DiffProcessor) processResult(res result.Result) (*result.Result, error) {
-	// Make mapping to restore original issues metadata later
-	fli := makeFilesToLinesToIssuesMap([]result.Result{res})
+func (p Diff) Process(issues []result.Issue) ([]result.Issue, error) {
+	if !p.onlyNew && p.fromRev == "" && p.patchFilePath == "" { // no need to work
+		return issues, nil
+	}
 
-	rIssues, err := p.runRevgrepOnIssues(res.Issues)
+	var patchReader io.Reader
+	if p.patchFilePath != "" {
+		patch, err := ioutil.ReadFile(p.patchFilePath)
 		if err != nil {
-		return nil, err
+			return nil, fmt.Errorf("can't read from pathc file %s: %s", p.patchFilePath, err)
+		}
+		patchReader = bytes.NewReader(patch)
+	}
+	c := revgrep.Checker{
+		Patch:        patchReader,
+		RevisionFrom: p.fromRev,
+	}
+	if err := c.Prepare(); err != nil {
+		return nil, fmt.Errorf("can't prepare diff by revgrep: %s", err)
 	}
 
-	newIssues := []result.Issue{}
-	for _, ri := range rIssues {
-		if fli[ri.File] == nil {
-			return nil, fmt.Errorf("can't get original issue file for %v", ri)
+	return transformIssues(issues, func(i *result.Issue) *result.Issue {
+		hunkPos, isNew := c.IsNewIssue(i)
+		if !isNew {
+			return nil
 		}
 
-		oi := fli[ri.File][ri.LineNo]
-		if len(oi) != 1 {
-			return nil, fmt.Errorf("can't get original issue for %v: %v", ri, oi)
+		newI := *i
+		newI.HunkPos = hunkPos
+		return &newI
+	}), nil
 }
 
-		i := result.Issue{
-			File:       ri.File,
-			LineNumber: ri.LineNo,
-			Text:       ri.Message,
-			HunkPos:    ri.HunkPos,
-			FromLinter: oi[0].FromLinter,
-		}
-		newIssues = append(newIssues, i)
-	}
-
-	res.Issues = newIssues
-	return &res, nil
-}
-
-func (p DiffProcessor) Process(results []result.Result) ([]result.Result, error) {
-	retResults := []result.Result{}
-	for _, res := range results {
-		newRes, err := p.processResult(res)
-		if err != nil {
-			return nil, fmt.Errorf("can't filter only new issues for result %+v: %s", res, err)
-		}
-		retResults = append(retResults, *newRes)
-	}
-
-	return retResults, nil
-}
-
-func (p DiffProcessor) runRevgrepOnIssues(issues []result.Issue) ([]revgrep.Issue, error) {
-	// TODO: change revgrep to accept interface with line number, file name
-	fakeIssuesLines := []string{}
-	for _, i := range issues {
-		line := fmt.Sprintf("%s:%d:%d: %s", i.File, i.LineNumber, 0, i.Text)
-		fakeIssuesLines = append(fakeIssuesLines, line)
-	}
-	fakeIssuesOut := strings.Join(fakeIssuesLines, "\n")
-
-	checker := revgrep.Checker{
-		Patch:  strings.NewReader(p.patch),
-		Regexp: `^([^:]+):(\d+):(\d+)?:?\s*(.*)$`,
-	}
-	rIssues, err := checker.Check(strings.NewReader(fakeIssuesOut), ioutil.Discard)
-	if err != nil {
-		return nil, fmt.Errorf("can't filter only new issues by revgrep: %s", err)
-	}
-
-	return rIssues, nil
-}
+func (Diff) Finish() {}

pkg/result/processors/utils.go

@@ -2,23 +2,6 @@ package processors
 
 import "github.com/golangci/golangci-lint/pkg/result"
 
-type linesToIssuesMap map[int][]result.Issue
-type filesToLinesToIssuesMap map[string]linesToIssuesMap
-
-func makeFilesToLinesToIssuesMap(results []result.Result) filesToLinesToIssuesMap {
-	fli := filesToLinesToIssuesMap{}
-	for _, res := range results {
-		for _, i := range res.Issues {
-			if fli[i.File] == nil {
-				fli[i.File] = linesToIssuesMap{}
-			}
-			li := fli[i.File]
-			li[i.LineNumber] = append(li[i.LineNumber], i)
-		}
-	}
-	return fli
-}
-
 func filterIssues(issues []result.Issue, filter func(i *result.Issue) bool) []result.Issue {
 	retIssues := make([]result.Issue, 0, len(issues))
 	for _, i := range issues {

vendor/github.com/golangci/revgrep/revgrep.go

@@ -40,6 +40,9 @@ type Checker struct {
 	// relative in order to match patch file. If not set, current working
 	// directory is used.
 	AbsPath string
+
+	// Calculated changes for next calls to IsNewIssue
+	changes map[string][]pos
 }
 
 // Issue contains metadata about an issue found.
@@ -61,6 +64,78 @@ type Issue struct {
 	Message string
 }
 
+func (c *Checker) preparePatch() error {
+	// Check if patch is supplied, if not, retrieve from VCS
+	if c.Patch == nil {
+		var err error
+		c.Patch, c.NewFiles, err = GitPatch(c.RevisionFrom, c.RevisionTo)
+		if err != nil {
+			return fmt.Errorf("could not read git repo: %s", err)
+		}
+		if c.Patch == nil {
+			return errors.New("no version control repository found")
+		}
+	}
+
+	return nil
+}
+
+type InputIssue interface {
+	FilePath() string
+	Line() int
+}
+
+type simpleInputIssue struct {
+	filePath   string
+	lineNumber int
+}
+
+func (i simpleInputIssue) FilePath() string {
+	return i.filePath
+}
+
+func (i simpleInputIssue) Line() int {
+	return i.lineNumber
+}
+
+func (c *Checker) Prepare() error {
+	returnErr := c.preparePatch()
+	c.changes = c.linesChanged()
+	return returnErr
+}
+
+func (c Checker) IsNewIssue(i InputIssue) (hunkPos int, isNew bool) {
+	fchanges, ok := c.changes[i.FilePath()]
+	if !ok { // file wasn't changed
+		return 0, false
+	}
+
+	var (
+		fpos    pos
+		changed bool
+	)
+	// found file, see if lines matched
+	for _, pos := range fchanges {
+		if pos.lineNo == int(i.Line()) {
+			fpos = pos
+			changed = true
+			break
+		}
+	}
+
+	if changed || fchanges == nil {
+		// either file changed or it's a new file
+		hunkPos := fpos.lineNo
+		if changed { // existing file changed
+			hunkPos = fpos.hunkPos
+		}
+
+		return hunkPos, true
+	}
+
+	return 0, false
+}
+
 // Check scans reader and writes any lines to writer that have been added in
 // Checker.Patch.
 //
@@ -72,22 +147,8 @@ type Issue struct {
 // File paths in reader must be relative to current working directory or
 // absolute.
 func (c Checker) Check(reader io.Reader, writer io.Writer) (issues []Issue, err error) {
-	// Check if patch is supplied, if not, retrieve from VCS
-	var (
-		writeAll  bool
-		returnErr error
-	)
-	if c.Patch == nil {
-		c.Patch, c.NewFiles, err = GitPatch(c.RevisionFrom, c.RevisionTo)
-		if err != nil {
-			writeAll = true
-			returnErr = fmt.Errorf("could not read git repo: %s", err)
-		}
-		if c.Patch == nil {
-			writeAll = true
-			returnErr = errors.New("no version control repository found")
-		}
-	}
+	returnErr := c.Prepare()
+	writeAll := returnErr != nil
 
 	// file.go:lineNo:colNo:message
 	// colNo is optional, strip spaces before message
@@ -101,8 +162,7 @@ func (c Checker) Check(reader io.Reader, writer io.Writer) (issues []Issue, err
 
 	// TODO consider lazy loading this, if there's nothing in stdin, no point
 	// checking for recent changes
-	linesChanged := c.linesChanged()
-	c.debugf("lines changed: %+v", linesChanged)
+	c.debugf("lines changed: %+v", c.changes)
 
 	absPath := c.AbsPath
 	if absPath == "" {
@@ -154,38 +214,23 @@ func (c Checker) Check(reader io.Reader, writer io.Writer) (issues []Issue, err
 		msg := string(line[4])
 
 		c.debugf("path: %q, lineNo: %v, colNo: %v, msg: %q", path, lno, cno, msg)
-
-		var (
-			fpos    pos
-			changed bool
-		)
-		if fchanges, ok := linesChanged[path]; ok {
-			// found file, see if lines matched
-			for _, pos := range fchanges {
-				if pos.lineNo == int(lno) {
-					fpos = pos
-					changed = true
+		i := simpleInputIssue{
+			filePath:   path,
+			lineNumber: int(lno),
 		}
-			}
-			if changed || fchanges == nil {
-				// either file changed or it's a new file
+		hunkPos, changed := c.IsNewIssue(i)
+		if changed {
 			issue := Issue{
 				File:    path,
-					LineNo:  fpos.lineNo,
+				LineNo:  int(lno),
 				ColNo:   int(cno),
-					HunkPos: fpos.lineNo,
+				HunkPos: hunkPos,
 				Issue:   scanner.Text(),
 				Message: msg,
 			}
-				if changed {
-					// existing file changed
-					issue.HunkPos = fpos.hunkPos
-				}
 			issues = append(issues, issue)
 			fmt.Fprintln(writer, scanner.Text())
-			}
-		}
-		if !changed {
+		} else {
 			c.debugf("unchanged: %s", scanner.Text())
 		}
 	}