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Migrate off using
git-* shell outs to search Go files
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103 changes: 103 additions & 0 deletions
103
staging/src/k8s.io/code-generator/pkg/fs/gosrc/search.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| /* | ||
| Copyright 2023 The Kubernetes Authors. | ||
| 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 gosrc | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "io/fs" | ||
| "os" | ||
| "path" | ||
| "path/filepath" | ||
| "regexp" | ||
| "strings" | ||
| ) | ||
|
|
||
| // Find returns the list of files matching the given matchers. The search is | ||
| // performed recursively from the given root directory. The file is only | ||
| // considered if it matches all the given matchers. | ||
| func Find(root string, matchers ...FileMatcher) ([]string, error) { | ||
| var files []string | ||
| err := filepath.WalkDir(root, func(p string, d fs.DirEntry, err error) error { | ||
| if err != nil { | ||
| return filepath.SkipDir | ||
| } | ||
| n := path.Base(p) | ||
| if !(d.Type().IsRegular() && | ||
| strings.HasSuffix(n, ".go") && | ||
| !strings.HasSuffix(n, "_test.go")) { | ||
| return nil | ||
| } | ||
| for _, m := range matchers { | ||
| if !m.MatchFile(p) { | ||
| return nil | ||
| } | ||
| } | ||
| files = append(files, p) | ||
| return nil | ||
|
|
||
| }) | ||
| return files, err | ||
| } | ||
|
|
||
| // FileEndsWith returns a FileMatcher that matches files with the given suffix. | ||
| func FileEndsWith(suffix string) FileMatcher { | ||
| return FileMatcherFunc(func(fp string) bool { | ||
| return strings.HasSuffix(fp, suffix) | ||
| }) | ||
| } | ||
|
|
||
| // FileContains returns a FileMatcher that matches files containing the given | ||
| // pattern. | ||
| func FileContains(pattern *regexp.Regexp) FileMatcher { | ||
| return FileMatcherFunc(func(fp string) bool { | ||
| return match(pattern, fp) | ||
| }) | ||
| } | ||
|
|
||
| // FileMatcher matches files. | ||
| type FileMatcher interface { | ||
| // MatchFile returns true if the given file path matches. | ||
| MatchFile(string) bool | ||
| } | ||
|
|
||
| // FileMatcherFunc is a function that matches files. | ||
| type FileMatcherFunc func(string) bool | ||
|
|
||
| // MatchFile implements FileMatcher. | ||
| func (f FileMatcherFunc) MatchFile(fp string) bool { | ||
| return f(fp) | ||
| } | ||
|
|
||
| func match(pattern *regexp.Regexp, fp string) bool { | ||
| // instead of reading the whole file into memory and matching against | ||
| // the whole file contents. | ||
| // The following code is similar to the following shell command: | ||
| // grep -q -e "$pattern" "$fp" | ||
| // The -q flag is used to suppress the output. | ||
| f, err := os.Open(fp) | ||
| if err != nil { | ||
| return false | ||
| } | ||
| defer f.Close() | ||
| scanner := bufio.NewScanner(f) | ||
| for scanner.Scan() { | ||
| if pattern.MatchString(scanner.Text()) { | ||
| return true | ||
| } | ||
| } | ||
| return false | ||
| } |
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