docs: adds example for restrict to files.

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

@@ -18,7 +18,7 @@ func main() {
 	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")
-	restrictToFiles := flag.String("restrict-to-files", "", "Regexps of files to restrict the inspection on. It takes precedence over -skip-files and -skip-dirs")
+	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)
@@ -49,7 +49,7 @@ Add import path to a folder
 		log.Fatalf("failed to build files regexes to exclude: %v", err)
 	}
 
-	restrictToFilesRegex, err := porto.GetRegexpList(*restrictToFiles)
+	restrictToFilesRegex, err := porto.GetRegexpList(*flagRestrictToFiles)
 	if err != nil {
 		log.Fatalf("failed to build files regexes to include: %v", err)
 	}