verbose = flag.Bool("v", false, "verbose mode")
)

// ToHTML in comment.go assigns a (possibly blank) ID to each heading
var html_h = regexp.MustCompile(`<h3 id="[^"]*">`)

const html_endh = "</h3>\n"

func isGoFile(fi fs.FileInfo) bool {
	return strings.HasSuffix(fi.Name(), ".go") &&
		!strings.HasSuffix(fi.Name(), "_test.go")
}

func appendHeadings(list []string, comment string) []string {
	var buf strings.Builder

import (
	"go/ast"
	"go/parser"
	"go/token"
	"os"
	"path"
	"runtime"
	"strings"
)

func isGoFile(dir os.FileInfo) bool {
	return !dir.IsDir() &&
		!strings.HasPrefix(dir.Name(), ".") && // ignore .files
		path.Ext(dir.Name()) == ".go"
}

func isPkgFile(dir os.FileInfo) bool {
	return isGoFile(dir) &&
		!strings.HasSuffix(dir.Name(), "_test.go") // ignore test files
}

func pkgName(filename string) string {

}

func isGoFile(fi fs.FileInfo) bool {
	name := fi.Name()
	return !fi.IsDir() &&
		len(name) > 0 && name[0] != '.' && // ignore .files
		filepath.Ext(name) == ".go"
}

type bundle struct {
	*Package
	FSet *token.FileSet
}

func test(t *testing.T, mode Mode) {
	// determine file filter
	filter := isGoFile
	if *files != "" {
		rx, err := regexp.Compile(*files)

func walkDir(path string) {
	filepath.WalkDir(path, visitFile)
}

func visitFile(path string, f fs.DirEntry, err error) error {
	if err == nil && isGoFile(f) {
		err = processFile(path, false)
	}
	if err != nil {
		report(err)
	}
	return nil
}

func isGoFile(f fs.DirEntry) bool {
	// ignore non-Go files
	name := f.Name()
	return !f.IsDir() && !strings.HasPrefix(name, ".") && strings.HasSuffix(name, ".go")

	defer close(filenames)

	handleFile := func(filename string, d fs.DirEntry, err error) error {
		if err != nil {
			t.Error(err)
			return nil
		}
		// don't descend into testdata directories
		if isGoFile(d) && !strings.Contains(filepath.ToSlash(filename), "/testdata/") {
			filenames <- filename
			nfiles++
		}
		return nil
	}

	// test Go files provided via -files, if any
	if *files != "" {

	}
	// It's only -r that makes use of go/ast's object resolution,
	// so avoid the unnecessary work if the flag isn't used.
	if *rewriteRule == "" {
		parserMode |= parser.SkipObjectResolution
	}
}

func isGoFile(f fs.DirEntry) bool {
	// ignore non-Go files
	name := f.Name()
	return !strings.HasPrefix(name, ".") && strings.HasSuffix(name, ".go") && !f.IsDir()
}