lib/controller/federation/generate.go

   1 // Copyright (C) The Arvados Authors. All rights reserved.
   2 //
   3 // SPDX-License-Identifier: AGPL-3.0
   4
   5 //go:build ignore
   6 // +build ignore
   7
   8 package main
   9
  10 import (
  11         "bytes"
  12         "io"
  13         "io/ioutil"
  14         "os"
  15         "os/exec"
  16         "regexp"
  17 )
  18
  19 func main() {
  20         checkOnly := false
  21         if len(os.Args) == 2 && os.Args[1] == "-check" {
  22                 checkOnly = true
  23         } else if len(os.Args) != 1 {
  24                 panic("usage: go run generate.go [-check]")
  25         }
  26
  27         in, err := os.Open("list.go")
  28         if err != nil {
  29                 panic(err)
  30         }
  31         buf, err := ioutil.ReadAll(in)
  32         if err != nil {
  33                 panic(err)
  34         }
  35         orig := regexp.MustCompile(`(?ms)\nfunc [^\n]*generated_CollectionList\(.*?\n}\n`).Find(buf)
  36         if len(orig) == 0 {
  37                 panic("can't find CollectionList func")
  38         }
  39
  40         outfile, err := os.OpenFile("generated.go~", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0777)
  41         if err != nil {
  42                 panic(err)
  43         }
  44
  45         gofmt := exec.Command("goimports")
  46         gofmt.Stdout = outfile
  47         gofmt.Stderr = os.Stderr
  48         out, err := gofmt.StdinPipe()
  49         if err != nil {
  50                 panic(err)
  51         }
  52         go func() {
  53                 defer out.Close()
  54                 out.Write(regexp.MustCompile(`(?ms)^.*package .*?import.*?\n\)\n`).Find(buf))
  55                 io.WriteString(out, "//\n// -- this file is auto-generated -- do not edit -- edit list.go and run \"go generate\" instead --\n//\n\n")
  56                 for _, t := range []string{"Container", "ContainerRequest", "Group", "Specimen", "User", "Link"} {
  57                         _, err := out.Write(bytes.ReplaceAll(orig, []byte("Collection"), []byte(t)))
  58                         if err != nil {
  59                                 panic(err)
  60                         }
  61                 }
  62         }()
  63         err = gofmt.Run()
  64         if err != nil {
  65                 panic(err)
  66         }
  67         err = outfile.Close()
  68         if err != nil {
  69                 panic(err)
  70         }
  71         if checkOnly {
  72                 diff := exec.Command("diff", "-u", "/dev/fd/3", "/dev/fd/4")
  73                 for _, fnm := range []string{"generated.go", "generated.go~"} {
  74                         f, err := os.Open(fnm)
  75                         if err != nil {
  76                                 panic(err)
  77                         }
  78                         defer f.Close()
  79                         diff.ExtraFiles = append(diff.ExtraFiles, f)
  80                 }
  81                 diff.Stdout = os.Stdout
  82                 diff.Stderr = os.Stderr
  83                 err = diff.Run()
  84                 if err != nil {
  85                         os.Exit(1)
  86                 }
  87         } else {
  88                 err = os.Rename("generated.go~", "generated.go")
  89                 if err != nil {
  90                         panic(err)
  91                 }
  92         }
  93 }