youtubebeat/vendor/github.com/elastic/beats/filebeat/input/file/glob.go

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2018-11-18 11:08:38 +01:00
// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 file
import (
"fmt"
"path/filepath"
)
func wildcards(doubleStarPatternDepth uint8, dir string, suffix string) []string {
wildcardList := []string{}
w := ""
i := uint8(0)
if dir == "" && suffix == "" {
// Don't expand to "" on relative paths
w = "*"
i = 1
}
for ; i <= doubleStarPatternDepth; i++ {
wildcardList = append(wildcardList, w)
w = filepath.Join(w, "*")
}
return wildcardList
}
// GlobPatterns detects the use of "**" and expands it to standard glob patterns up to a max depth
func GlobPatterns(pattern string, doubleStarPatternDepth uint8) ([]string, error) {
if doubleStarPatternDepth == 0 {
return []string{pattern}, nil
}
var wildcardList []string
var prefix string
var suffix string
dir, file := filepath.Split(filepath.Clean(pattern))
for file != "" && file != "." {
if file == "**" {
if len(wildcardList) > 0 {
return nil, fmt.Errorf("multiple ** in %q", pattern)
}
wildcardList = wildcards(doubleStarPatternDepth, dir, suffix)
prefix = dir
} else if len(wildcardList) == 0 {
suffix = filepath.Join(file, suffix)
}
dir, file = filepath.Split(filepath.Clean(dir))
}
if len(wildcardList) == 0 {
return []string{pattern}, nil
}
var patterns []string
for _, w := range wildcardList {
patterns = append(patterns, filepath.Join(prefix, w, suffix))
}
return patterns, nil
}
// Glob expands '**' patterns into multiple patterns to satisfy https://golang.org/pkg/path/filepath/#Match
func Glob(pattern string, doubleStarPatternDepth uint8) ([]string, error) {
patterns, err := GlobPatterns(pattern, doubleStarPatternDepth)
if err != nil {
return nil, err
}
var matches []string
for _, p := range patterns {
// Evaluate the path as a wildcards/shell glob
match, err := filepath.Glob(p)
if err != nil {
return nil, err
}
matches = append(matches, match...)
}
return matches, nil
}