Cheap-ass filepath.WalkDir example

all-files.txt

.
./all-files.txt
./sub1
./sub1/foo.toml
./sub1/foo.json
./sub1/bar.json
./sub1/foo.yaml
./sub1/sub2
./sub1/sub2/foo.blarg
./sub1/sub2/blarg.yamllllll
./globwalk.go
./foo.txt
./bar.txt
./glob.go
./output.txt

globwalk.go

package main

import (
	"fmt"
	"io/fs"
	"log"
	"path/filepath"
)

func main() {
	const excludePat = "foo*"
	var (
		include []string
		filter  = genExcludeFilter(excludePat, &include)
	)
	if err := filepath.WalkDir(".", filter); err != nil {
		log.Fatalf("error walking directory: %v", err)
	}
	for _, f := range include {
		fmt.Println(f)
	}
}

func genExcludeFilter(
	excludePat string,
	include *[]string,
) func(string, fs.DirEntry, error) error {
	return func(path string, dirEntry fs.DirEntry, err error) error {
		if err != nil {
			if dirEntry != nil {
				return fs.SkipDir
			}
			return err
		}
		if dirEntry.IsDir() {
			// Skip directories.
			return nil
		}
		exclude, err := filepath.Match(excludePat, dirEntry.Name())
		if err != nil {
			return err
		}
		if !exclude {
			*include = append(*include, path)
		}
		return nil
	}
}

output.txt

all-files.txt
bar.txt
glob.go
globwalk.go
output.txt
sub1/bar.json
sub1/sub2/blarg.yamllllll