Serge Bazanski | 31dd616 | 2018-10-25 14:20:50 +0200 | [diff] [blame] | 1 | package builder |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "os" |
| 6 | "path/filepath" |
| 7 | "regexp" |
| 8 | "strings" |
| 9 | "sync" |
| 10 | "text/template" |
| 11 | |
| 12 | "github.com/pkg/errors" |
| 13 | "golang.org/x/sync/errgroup" |
| 14 | ) |
| 15 | |
| 16 | var DebugLog func(string, ...interface{}) |
| 17 | |
| 18 | func init() { |
| 19 | DebugLog = func(string, ...interface{}) {} |
| 20 | } |
| 21 | |
| 22 | var invalidFilePattern = regexp.MustCompile(`(_test|-packr).go$`) |
| 23 | |
| 24 | // Builder scans folders/files looking for `packr.NewBox` and then compiling |
| 25 | // the required static files into `<package-name>-packr.go` files so they can |
| 26 | // be built into Go binaries. |
| 27 | type Builder struct { |
| 28 | context.Context |
| 29 | RootPath string |
| 30 | IgnoredBoxes []string |
| 31 | IgnoredFolders []string |
| 32 | pkgs map[string]pkg |
| 33 | moot *sync.Mutex |
| 34 | Compress bool |
| 35 | } |
| 36 | |
| 37 | // Run the builder. |
| 38 | func (b *Builder) Run() error { |
| 39 | wg := &errgroup.Group{} |
| 40 | root, err := filepath.EvalSymlinks(b.RootPath) |
| 41 | if err != nil { |
| 42 | return errors.WithStack(err) |
| 43 | } |
| 44 | err = filepath.Walk(root, func(path string, info os.FileInfo, err error) error { |
| 45 | if info == nil { |
| 46 | return filepath.SkipDir |
| 47 | } |
| 48 | |
| 49 | base := strings.ToLower(filepath.Base(path)) |
| 50 | if strings.HasPrefix(base, "_") { |
| 51 | return filepath.SkipDir |
| 52 | } |
| 53 | for _, f := range b.IgnoredFolders { |
| 54 | if strings.ToLower(f) == base { |
| 55 | if info.IsDir() { |
| 56 | return filepath.SkipDir |
| 57 | } else { |
| 58 | return nil |
| 59 | } |
| 60 | } |
| 61 | } |
| 62 | if !info.IsDir() { |
| 63 | wg.Go(func() error { |
| 64 | return b.process(path) |
| 65 | }) |
| 66 | } |
| 67 | return nil |
| 68 | }) |
| 69 | if err != nil { |
| 70 | return errors.WithStack(err) |
| 71 | } |
| 72 | if err := wg.Wait(); err != nil { |
| 73 | return errors.WithStack(err) |
| 74 | } |
| 75 | return b.dump() |
| 76 | } |
| 77 | |
| 78 | func (b *Builder) dump() error { |
| 79 | for _, p := range b.pkgs { |
| 80 | name := filepath.Join(p.Dir, "a_"+p.Name+"-packr.go") |
| 81 | f, err := os.Create(name) |
| 82 | defer f.Close() |
| 83 | if err != nil { |
| 84 | return errors.WithStack(err) |
| 85 | } |
| 86 | t, err := template.New("").Parse(tmpl) |
| 87 | |
| 88 | if err != nil { |
| 89 | return errors.WithStack(err) |
| 90 | } |
| 91 | err = t.Execute(f, p) |
| 92 | if err != nil { |
| 93 | return errors.WithStack(err) |
| 94 | } |
| 95 | } |
| 96 | return nil |
| 97 | } |
| 98 | |
| 99 | func (b *Builder) process(path string) error { |
| 100 | ext := filepath.Ext(path) |
| 101 | if ext != ".go" || invalidFilePattern.MatchString(path) { |
| 102 | return nil |
| 103 | } |
| 104 | |
| 105 | v := newVisitor(path) |
| 106 | if err := v.Run(); err != nil { |
| 107 | return errors.WithStack(err) |
| 108 | } |
| 109 | |
| 110 | pk := pkg{ |
| 111 | Dir: filepath.Dir(path), |
| 112 | Boxes: []box{}, |
| 113 | Name: v.Package, |
| 114 | } |
| 115 | |
| 116 | for _, n := range v.Boxes { |
| 117 | var ignored bool |
| 118 | for _, i := range b.IgnoredBoxes { |
| 119 | if n == i { |
| 120 | // this is an ignored box |
| 121 | ignored = true |
| 122 | break |
| 123 | } |
| 124 | } |
| 125 | if ignored { |
| 126 | continue |
| 127 | } |
| 128 | bx := &box{ |
| 129 | Name: n, |
| 130 | Files: []file{}, |
| 131 | compress: b.Compress, |
| 132 | } |
| 133 | DebugLog("building box %s\n", bx.Name) |
| 134 | p := filepath.Join(pk.Dir, bx.Name) |
| 135 | if err := bx.Walk(p); err != nil { |
| 136 | return errors.WithStack(err) |
| 137 | } |
| 138 | if len(bx.Files) > 0 { |
| 139 | pk.Boxes = append(pk.Boxes, *bx) |
| 140 | } |
| 141 | DebugLog("built box %s with %q\n", bx.Name, bx.Files) |
| 142 | } |
| 143 | |
| 144 | if len(pk.Boxes) > 0 { |
| 145 | b.addPkg(pk) |
| 146 | } |
| 147 | return nil |
| 148 | } |
| 149 | |
| 150 | func (b *Builder) addPkg(p pkg) { |
| 151 | b.moot.Lock() |
| 152 | defer b.moot.Unlock() |
| 153 | if _, ok := b.pkgs[p.Name]; !ok { |
| 154 | b.pkgs[p.Name] = p |
| 155 | return |
| 156 | } |
| 157 | pp := b.pkgs[p.Name] |
| 158 | pp.Boxes = append(pp.Boxes, p.Boxes...) |
| 159 | b.pkgs[p.Name] = pp |
| 160 | } |
| 161 | |
| 162 | // New Builder with a given context and path |
| 163 | func New(ctx context.Context, path string) *Builder { |
| 164 | return &Builder{ |
| 165 | Context: ctx, |
| 166 | RootPath: path, |
| 167 | IgnoredBoxes: []string{}, |
| 168 | IgnoredFolders: []string{"vendor", ".git", "node_modules", ".idea"}, |
| 169 | pkgs: map[string]pkg{}, |
| 170 | moot: &sync.Mutex{}, |
| 171 | } |
| 172 | } |