336 lines
7.0 KiB
Go
336 lines
7.0 KiB
Go
/*
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* Copyright 2015 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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package main
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import (
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"bufio"
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"flag"
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"fmt"
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"log"
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"os"
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"os/exec"
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"regexp"
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"strings"
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)
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type subsystem struct {
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name string
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maintainer []string
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paths []string
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globs []*regexp.Regexp
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}
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var subsystems []subsystem
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func get_git_files() ([]string, error) {
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var files []string
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/* Read in list of all files in the git repository */
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cmd := exec.Command("git", "ls-files")
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out, err := cmd.StdoutPipe()
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if err != nil {
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log.Fatalf("git ls-files failed: %v", err)
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return files, err
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}
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if err := cmd.Start(); err != nil {
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log.Fatalf("Could not start %v: %v", cmd, err)
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return files, err
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}
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r := bufio.NewScanner(out)
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for r.Scan() {
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/* Cut out leading tab */
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files = append(files, r.Text())
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}
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cmd.Wait()
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return files, nil
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}
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func get_maintainers() ([]string, error) {
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var maintainers []string
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/* Read in all maintainers */
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file, err := os.Open("MAINTAINERS")
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if err != nil {
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log.Fatalf("Can't open MAINTAINERS file: %v", err)
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log.Fatalf("Are you running from the top-level directory?")
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return maintainers, err
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}
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defer file.Close()
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keep := false
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s := bufio.NewScanner(file)
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for s.Scan() {
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/* Are we in the "data" section and have a non-empty line? */
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if keep && s.Text() != "" {
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maintainers = append(maintainers, s.Text())
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}
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/* Skip everything before the delimiter */
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if s.Text() == "\t\t-----------------------------------" {
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keep = true
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}
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}
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return maintainers, nil
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}
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func path_to_regexstr(path string) string {
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// if prefix, allow all subdirectories
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if path[len(path)-1] == '/' {
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path += "*"
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}
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return glob_to_regex(path)
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}
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func path_to_regex(path string) *regexp.Regexp {
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regexstr := path_to_regexstr(path)
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return regexp.MustCompile(regexstr)
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}
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func build_maintainers(maintainers []string) {
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var current *subsystem
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for _, line := range maintainers {
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if line[1] != ':' {
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/* Create new subsystem entry */
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var tmp subsystem
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subsystems = append(subsystems, tmp)
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current = &subsystems[len(subsystems)-1]
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current.name = line
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} else {
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switch line[0] {
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case 'R', 'M':
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/* Add subsystem maintainer */
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current.maintainer = append(current.maintainer, line[3:len(line)])
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case 'F':
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// add files
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current.paths = append(current.paths, line[3:len(line)])
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current.globs = append(current.globs, path_to_regex(line[3:len(line)]))
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break
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case 'L', 'S', 'T', 'W': // ignore
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default:
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fmt.Println("No such specifier: ", line)
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}
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}
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}
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}
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func print_maintainers() {
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for _, subsystem := range subsystems {
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fmt.Println(subsystem.name)
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fmt.Println(" ", subsystem.maintainer)
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fmt.Println(" ", subsystem.paths)
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}
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}
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func match_file(fname string, component subsystem) bool {
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for _, glob := range component.globs {
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if glob.Match([]byte(fname)) {
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return true
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}
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}
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return false
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}
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func find_maintainer(fname string) {
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var success bool
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for _, subsystem := range subsystems {
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matched := match_file(fname, subsystem)
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if matched {
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success = true
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fmt.Println(fname, "is in subsystem",
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subsystem.name)
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fmt.Println("Maintainers: ", strings.Join(subsystem.maintainer, ", "))
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}
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}
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if !success {
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fmt.Println(fname, "has no subsystem defined in MAINTAINERS")
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}
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}
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func find_unmaintained(fname string) {
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var success bool
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for _, subsystem := range subsystems {
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matched := match_file(fname, subsystem)
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if matched {
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success = true
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fmt.Println(fname, "is in subsystem",
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subsystem.name)
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}
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}
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if !success {
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fmt.Println(fname, "has no subsystem defined in MAINTAINERS")
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}
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}
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// taken from https://github.com/zyedidia/glob/blob/master/glob.go which is
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// Copyright (c) 2016: Zachary Yedidia.
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// and was published under the MIT "Expat" license.
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//
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// only change: return the string, instead of a compiled golang regex
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func glob_to_regex(glob string) string {
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regex := ""
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inGroup := 0
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inClass := 0
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firstIndexInClass := -1
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arr := []byte(glob)
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for i := 0; i < len(arr); i++ {
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ch := arr[i]
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switch ch {
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case '\\':
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i++
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if i >= len(arr) {
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regex += "\\"
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} else {
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next := arr[i]
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switch next {
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case ',':
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// Nothing
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case 'Q', 'E':
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regex += "\\\\"
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default:
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regex += "\\"
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}
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regex += string(next)
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}
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case '*':
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if inClass == 0 {
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regex += ".*"
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} else {
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regex += "*"
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}
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case '?':
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if inClass == 0 {
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regex += "."
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} else {
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regex += "?"
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}
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case '[':
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inClass++
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firstIndexInClass = i + 1
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regex += "["
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case ']':
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inClass--
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regex += "]"
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case '.', '(', ')', '+', '|', '^', '$', '@', '%':
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if inClass == 0 || (firstIndexInClass == i && ch == '^') {
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regex += "\\"
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}
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regex += string(ch)
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case '!':
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if firstIndexInClass == i {
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regex += "^"
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} else {
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regex += "!"
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}
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case '{':
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inGroup++
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regex += "("
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case '}':
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inGroup--
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regex += ")"
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case ',':
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if inGroup > 0 {
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regex += "|"
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} else {
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regex += ","
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}
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default:
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regex += string(ch)
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}
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}
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return "^" + regex + "$"
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}
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var is_email *regexp.Regexp
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func extract_maintainer(maintainer string) string {
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if is_email == nil {
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is_email = regexp.MustCompile("<[^>]*>")
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}
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if match := is_email.FindStringSubmatch(maintainer); match != nil {
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return match[0][1 : len(match[0])-1]
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}
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return maintainer
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}
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func do_print_gerrit_rules() {
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for _, subsystem := range subsystems {
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if len(subsystem.paths) == 0 || len(subsystem.maintainer) == 0 {
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continue
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}
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fmt.Println("#", subsystem.name)
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for _, path := range subsystem.paths {
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fmt.Println("[filter \"file:" + path_to_regexstr(path) + "\"]")
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for _, maint := range subsystem.maintainer {
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fmt.Println(" reviewer =", extract_maintainer(maint))
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}
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}
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fmt.Println()
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}
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}
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func main() {
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var (
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files []string
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err error
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print_gerrit_rules = flag.Bool("print-gerrit-rules", false, "emit the MAINTAINERS rules in a format suitable for Gerrit's reviewers plugin")
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debug = flag.Bool("debug", false, "emit additional debug output")
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)
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flag.Parse()
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/* get and build subsystem database */
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maintainers, err := get_maintainers()
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if err != nil {
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log.Fatalf("Oops.")
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return
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}
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build_maintainers(maintainers)
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if *debug {
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print_maintainers()
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}
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if *print_gerrit_rules {
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do_print_gerrit_rules()
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return
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}
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args := flag.Args()
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if len(args) == 0 {
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/* get the filenames */
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files, err = get_git_files()
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if err != nil {
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log.Fatalf("Oops.")
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return
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}
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for _, file := range files {
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find_unmaintained(file)
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}
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} else {
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files = args
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/* Find maintainers for each file */
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for _, file := range files {
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find_maintainer(file)
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}
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}
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}
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