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package collection
import (
"errors"
"os"
"path/filepath"
)
// DirectoryOptions is a means of configuring a `Directory` instance to including various children in its enumeration without
// supplying a `Where` clause later.
type DirectoryOptions uint
// These constants define all of the supported options for configuring a `Directory`
const (
DirectoryOptionsExcludeFiles = 1 << iota
DirectoryOptionsExcludeDirectories
DirectoryOptionsRecursive
)
// Directory treats a filesystem path as a collection of filesystem entries, specifically a collection of directories and files.
type Directory struct {
Location string
Options DirectoryOptions
}
func defaultEnumeratePredicate(loc string, info os.FileInfo) bool {
return true
}
func (d Directory) applyOptions(loc string, info os.FileInfo) bool {
if info.IsDir() && 0 != (d.Options&DirectoryOptionsExcludeDirectories) {
return false
}
if !info.IsDir() && 0 != d.Options&DirectoryOptionsExcludeFiles {
return false
}
return true
}
// Enumerate lists the items in a `Directory`
func (d Directory) Enumerate(cancel <-chan struct{}) Enumerator {
results := make(chan interface{})
go func() {
defer close(results)
filepath.Walk(d.Location, func(currentLocation string, info os.FileInfo, openErr error) (err error) {
if openErr != nil {
err = openErr
return
}
if d.Location == currentLocation {
return
}
if info.IsDir() && 0 == d.Options&DirectoryOptionsRecursive {
err = filepath.SkipDir
}
if d.applyOptions(currentLocation, info) {
select {
case results <- currentLocation:
// Intentionally Left Blank
case <-cancel:
err = errors.New("directory enumeration cancelled")
}
}
return
})
}()
return results
}
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