filesystem.go

/*
   Copyright 2014 CoreOS, Inc.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package pkg

import (
	"io/ioutil"
)

// ListDirectory generates a slice of all the file names that both exist in
// the provided directory and pass the filter.
// The returned file names are relative to the directory argument.
// filterFunc is called once for each file found in the directory. If
// filterFunc returns true, the given file will ignored.
func ListDirectory(dir string, filterFunc func(string) bool) ([]string, error) {
	fis, err := ioutil.ReadDir(dir)
	if err != nil {
		return nil, err
	}

	units := make([]string, 0)
	for _, fi := range fis {
		name := fi.Name()
		if filterFunc(name) {
			continue
		}
		units = append(units, name)
	}

	return units, nil
}