forked from google/go-licenses
/
find.go
90 lines (84 loc) · 2.48 KB
/
find.go
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// Copyright 2019 Google Inc. All Rights Reserved.
//
// 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 licenses
import (
"fmt"
"go/build"
"io/ioutil"
"path/filepath"
"regexp"
)
var (
licenseRegexp = regexp.MustCompile(`^(?i)(LICEN(S|C)E|COPYING|README|NOTICE)(\..+)?$`)
srcDirRegexps = func() []*regexp.Regexp {
var rs []*regexp.Regexp
for _, s := range build.Default.SrcDirs() {
rs = append(rs, regexp.MustCompile("^"+regexp.QuoteMeta(s)+"$"))
}
return rs
}()
vendorRegexp = regexp.MustCompile(`.+/vendor(/)?$`)
)
// Find returns the file path of the license for this package.
func Find(dir string, classifier Classifier) (string, error) {
var stopAt []*regexp.Regexp
stopAt = append(stopAt, srcDirRegexps...)
stopAt = append(stopAt, vendorRegexp)
return findUpwards(dir, licenseRegexp, stopAt, func(path string) bool {
// TODO(RJPercival): Return license details
if _, _, err := classifier.Identify(path); err != nil {
return false
}
return true
})
}
func findUpwards(dir string, r *regexp.Regexp, stopAt []*regexp.Regexp, predicate func(path string) bool) (string, error) {
// Dir must be made absolute for reliable matching with stopAt regexps
dir, err := filepath.Abs(dir)
if err != nil {
return "", err
}
start := dir
// Stop once dir matches a stopAt regexp or dir is the filesystem root
for !matchAny(stopAt, dir) {
dirContents, err := ioutil.ReadDir(dir)
if err != nil {
return "", err
}
for _, f := range dirContents {
if r.MatchString(f.Name()) {
path := filepath.Join(dir, f.Name())
if predicate != nil && !predicate(path) {
continue
}
return path, nil
}
}
parent := filepath.Dir(dir)
if parent == dir {
// Can't go any higher up the directory tree.
break
}
dir = parent
}
return "", fmt.Errorf("no file/directory matching regexp %q found for %s", r, start)
}
func matchAny(patterns []*regexp.Regexp, s string) bool {
for _, p := range patterns {
if p.MatchString(s) {
return true
}
}
return false
}