// Package fs provides functions for filesystem operations.

package fs

import (

"os"

"path/filepath"

"strings"

)

var (

// MarkdownOnly is a filter that only lets pass Markdown files.

MarkdownOnly = func(file string) bool {

return filepath.Ext(file) == ".md"

}

// NoUnderscores is a predefined filter that doesn't let pass

// files starting with an underscore.

NoUnderscores = func(file string) bool {

filename := filepath.Base(file)

return !strings.HasPrefix(filename, "_")

}

// ErrStreaming is returned from StreamFiles.

ErrStreaming error = nil

)

// StreamFiles sends files in a given path that match the given

// filters through the files channel.

func StreamFiles(path string, files chan<- string, filters ...func(file string) bool) error {

if _, err := os.Stat(path); os.IsNotExist(err) {

close(files)

return nil

}

ErrStreaming = filepath.Walk(path, func(file string, info os.FileInfo, err error) error {

if err != nil {

return err

}

if info.IsDir() {

return nil

}

for _, filter := range filters {

if !filter(file) {

return nil

}

}

files <- file

return nil

})

close(files)

return ErrStreaming

}

// MkdirAll creates one or more directories inside the given path.

func MkdirAll(path string, dirs ...string) error {

for _, dir := range dirs {

if err := os.MkdirAll(filepath.Join(path, dir), 0755); err != nil {

return err

}

}

return nil

}