podman

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//go:build go1.16 && finder
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// +build go1.16,finder
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package viper
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import (
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	"errors"
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	"io/fs"
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	"path"
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)
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type finder struct {
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	paths      []string
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	fileNames  []string
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	extensions []string
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	withoutExtension bool
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}
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func (f finder) Find(fsys fs.FS) (string, error) {
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	for _, searchPath := range f.paths {
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		for _, fileName := range f.fileNames {
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			for _, extension := range f.extensions {
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				filePath := path.Join(searchPath, fileName+"."+extension)
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				ok, err := fileExists(fsys, filePath)
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				if err != nil {
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					return "", err
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				}
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				if ok {
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					return filePath, nil
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				}
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			}
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			if f.withoutExtension {
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				filePath := path.Join(searchPath, fileName)
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				ok, err := fileExists(fsys, filePath)
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				if err != nil {
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					return "", err
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				}
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				if ok {
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					return filePath, nil
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				}
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			}
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		}
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	}
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	return "", nil
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}
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func fileExists(fsys fs.FS, filePath string) (bool, error) {
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	fileInfo, err := fs.Stat(fsys, filePath)
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	if err == nil {
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		return !fileInfo.IsDir(), nil
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	}
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	if errors.Is(err, fs.ErrNotExist) {
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		return false, nil
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	}
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	return false, err
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}
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