chore: adds -restrict-to-files flag.

.github/workflows/merge.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        go: ["1.13", "1.14", "1.15", "1.16", "1.17", "1.18", "1.19", "1.20", "1.21"]
+        go: ["1.19", "1.20", "1.21"]
     steps:
       # Set fetch-depth: 0 to fetch commit history and tags for use in version calculation
       - name: Check out code

README.md

@@ -29,6 +29,7 @@ If you just want to list the files that porto would change vanity import, run:
 ```bash
 porto -l path/to/library
 ```
+
 ## Inclusion/exclusion rules
 
 `porto` skips autogenerated, internal, third party and vendored files by default. You can customize what files get included using some flags:
@@ -38,13 +39,22 @@ porto -l path/to/library
 ```bash
 porto --skip-files ".*\\.pb\\.go$" path/to/library
 ```
+
 - If you want to ignore directories (e.g. tooling directories), pass the `--skip-dirs` flag:
 
 ```bash
 porto --skip-dirs "^tools$" path/to/library
 ```
+
 - If you want to include `internal` folders and directories skipped by default:
 
 ```bash
 porto --include-internal --skip-dirs-use-default=false path/to/library
 ```
+
+- If you want to restrict to certain files e.g. `doc.go` you
+can use:
+
+```bash
+porto --restrict-to-files "doc.go$" path/to/library
+```

cmd/porto/main.go

@@ -12,27 +12,20 @@ import (
 )
 
 func main() {
-	flagWriteOutputToFile := flag.Bool("w", false, "write result to (source) file instead of stdout")
-	flagListDiff := flag.Bool("l", false, "list files whose vanity import differs from porto's")
+	flagWriteOutputToFile := flag.Bool("w", false, "Write result to (source) file instead of stdout")
+	flagListDiff := flag.Bool("l", false, "List files whose vanity import differs from porto's")
 	flagSkipFiles := flag.String("skip-files", "", "Regexps of files to skip")
 	flagSkipDirs := flag.String("skip-dirs", "", "Regexps of directories to skip")
-	flagSkipDefaultDirs := flag.Bool("skip-dirs-use-default", true, "use default skip directory list")
-	flagIncludeInternal := flag.Bool("include-internal", false, "include internal folders")
+	flagSkipDefaultDirs := flag.Bool("skip-dirs-use-default", true, "Use default skip directory list")
+	flagIncludeInternal := flag.Bool("include-internal", false, "Include internal folders")
+	flagRestrictToFiles := flag.String("restrict-to-files", "", "Regexps of files to restrict the inspection on. It takes precedence over -skip-files and -skip-dirs")
 	flag.Parse()
 
 	baseDir := flag.Arg(0)
+
 	if len(flag.Args()) == 0 {
+		flag.Usage()
 		fmt.Println(`
-usage: porto [options] <target-path>
-
-Options:
--w                       Write result to (source) file instead of stdout (default: false)
--l                       List files whose vanity import differs from porto's (default: false)
---skip-files             Regexps of files to skip
---skip-dirs              Regexps of directories to skip
---skip-dirs-use-default  Use default skip directory list (default: true)
---include-internal       Include internal folders
-
 Examples:
 
 Add import path to a folder
@@ -53,7 +46,12 @@ Add import path to a folder
 
 	skipFilesRegex, err := porto.GetRegexpList(*flagSkipFiles)
 	if err != nil {
-		log.Fatalf("failed to build files regexes: %v", err)
+		log.Fatalf("failed to build files regexes to exclude: %v", err)
+	}
+
+	restrictToFilesRegex, err := porto.GetRegexpList(*flagRestrictToFiles)
+	if err != nil {
+		log.Fatalf("failed to build files regexes to include: %v", err)
 	}
 
 	var skipDirsRegex []*regexp.Regexp
@@ -66,13 +64,20 @@ Add import path to a folder
 	}
 	skipDirsRegex = append(skipDirsRegex, userSkipDirsRegex...)
 
-	diffCount, err := porto.FindAndAddVanityImportForDir(workingDir, baseAbsDir, porto.Options{
+	opts := porto.Options{
 		WriteResultToFile: *flagWriteOutputToFile,
 		ListDiffFiles:     *flagListDiff,
-		SkipFilesRegexes:  skipFilesRegex,
-		SkipDirsRegexes:   skipDirsRegex,
 		IncludeInternal:   *flagIncludeInternal,
-	})
+	}
+
+	if len(restrictToFilesRegex) > 0 {
+		opts.RestrictToFilesRegexes = restrictToFilesRegex
+	} else {
+		opts.SkipFilesRegexes = skipFilesRegex
+		opts.SkipDirsRegexes = skipDirsRegex
+	}
+
+	diffCount, err := porto.FindAndAddVanityImportForDir(workingDir, baseAbsDir, opts)
 	if err != nil {
 		log.Fatal(err)
 	}

import.go

@@ -7,7 +7,7 @@ import (
 	"go/ast"
 	"go/parser"
 	"go/token"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 	"regexp"
 	"strings"
@@ -56,7 +56,7 @@ func addImportPath(absFilepath string, module string) (bool, []byte, error) {
 		return false, nil, errGenerated
 	}
 
-	content, err := ioutil.ReadFile(absFilepath)
+	content, err := os.ReadFile(absFilepath)
 	if err != nil {
 		return false, nil, fmt.Errorf("failed to parse the file %q: %v", absFilepath, err)
 	}
@@ -99,7 +99,7 @@ func findAndAddVanityImportForModuleDir(workingDir, absDir string, moduleName st
 		return 0, nil
 	}
 
-	files, err := ioutil.ReadDir(absDir)
+	files, err := os.ReadDir(absDir)
 	if err != nil {
 		return 0, fmt.Errorf("failed to read the content of %q: %v", absDir, err)
 	}
@@ -127,7 +127,18 @@ func findAndAddVanityImportForModuleDir(workingDir, absDir string, moduleName st
 			}
 
 			gc += c
-		} else if fileName := f.Name(); isGoFile(fileName) && !isGoTestFile(fileName) && !matchesAny(opts.SkipFilesRegexes, fileName) {
+		} else if fileName := f.Name(); isGoFile(fileName) && !isGoTestFile(fileName) {
+			shouldEvaluate := true
+			if len(opts.RestrictToFilesRegexes) > 0 {
+				shouldEvaluate = matchesAny(opts.RestrictToFilesRegexes, fileName)
+			} else if len(opts.SkipFilesRegexes) > 0 {
+				shouldEvaluate = !matchesAny(opts.SkipFilesRegexes, fileName)
+			}
+
+			if !shouldEvaluate {
+				continue
+			}
+
 			absFilepath := absDir + pathSeparator + fileName
 
 			hasChanged, newContent, err := addImportPath(absDir+pathSeparator+fileName, moduleName)
@@ -181,7 +192,7 @@ func matchesAny(regexes []*regexp.Regexp, str string) bool {
 }
 
 func findAndAddVanityImportForNonModuleDir(workingDir, absDir string, opts Options) (int, error) {
-	files, err := ioutil.ReadDir(absDir)
+	files, err := os.ReadDir(absDir)
 	if err != nil {
 		return 0, fmt.Errorf("failed to read %q: %v", absDir, err)
 	}
@@ -231,6 +242,8 @@ type Options struct {
 	SkipDirsRegexes []*regexp.Regexp
 	// Include internal packages
 	IncludeInternal bool
+	// Set of regex for matching files to be included
+	RestrictToFilesRegexes []*regexp.Regexp
 }
 
 // FindAndAddVanityImportForDir scans all files in a folder and based on go.mod files
@@ -240,7 +253,7 @@ func FindAndAddVanityImportForDir(workingDir, absDir string, opts Options) (int,
 		return findAndAddVanityImportForModuleDir(workingDir, absDir, moduleName, opts)
 	}
 
-	files, err := ioutil.ReadDir(absDir)
+	files, err := os.ReadDir(absDir)
 	if err != nil {
 		return 0, fmt.Errorf("failed to read the content of %q: %v", absDir, err)
 	}

import_test.go

@@ -72,6 +72,52 @@ func TestFindFilesWithVanityImport(t *testing.T) {
 		assert.Equal(t, 0, c)
 	})
 
+	t.Run("skip file", func(t *testing.T) {
+		c, err := findAndAddVanityImportForModuleDir(
+			cwd,
+			cwd+"/testdata/leftpad",
+			"github.com/jcchavezs/porto-integration-leftpad",
+			Options{
+				ListDiffFiles:    true,
+				SkipFilesRegexes: []*regexp.Regexp{regexp.MustCompile(`leftpad\.go`)},
+			},
+		)
+
+		require.NoError(t, err)
+		assert.Equal(t, 1, c)
+	})
+
+	t.Run("include file", func(t *testing.T) {
+		c, err := findAndAddVanityImportForModuleDir(
+			cwd,
+			cwd+"/testdata/leftpad",
+			"github.com/jcchavezs/porto-integration-leftpad",
+			Options{
+				ListDiffFiles:          true,
+				RestrictToFilesRegexes: []*regexp.Regexp{regexp.MustCompile(`other\.go`)},
+			},
+		)
+
+		require.NoError(t, err)
+		assert.Equal(t, 1, c)
+	})
+
+	t.Run("skip and include file", func(t *testing.T) {
+		c, err := findAndAddVanityImportForModuleDir(
+			cwd,
+			cwd+"/testdata/leftpad",
+			"github.com/jcchavezs/porto-integration-leftpad",
+			Options{
+				ListDiffFiles:          true,
+				RestrictToFilesRegexes: []*regexp.Regexp{regexp.MustCompile(`other\.go`)},
+				SkipFilesRegexes:       []*regexp.Regexp{regexp.MustCompile(`leftpad\.go`)},
+			},
+		)
+
+		require.NoError(t, err)
+		assert.Equal(t, 1, c)
+	})
+
 }
 
 func TestMatchesAny(t *testing.T) {