|
| 1 | +package vite |
| 2 | + |
| 3 | +import ( |
| 4 | + "embed" |
| 5 | + "encoding/json" |
| 6 | + "fmt" |
| 7 | + "html/template" |
| 8 | + "io/fs" |
| 9 | + "log/slog" |
| 10 | + "os" |
| 11 | + "strings" |
| 12 | +) |
| 13 | + |
| 14 | +type Vite struct { |
| 15 | + IsDev bool |
| 16 | + PublicFS fs.FS |
| 17 | + AssetsFS fs.FS |
| 18 | + Manifest Manifest |
| 19 | + DevPrefix string |
| 20 | + ProdPrefix string |
| 21 | +} |
| 22 | + |
| 23 | +type Manifest map[string]*Chunk |
| 24 | + |
| 25 | +type Chunk struct { |
| 26 | + File string `json:"file"` |
| 27 | +} |
| 28 | + |
| 29 | +func New(logger *slog.Logger, isDev bool, distFS embed.FS) (*Vite, error) { |
| 30 | + var publicFS fs.FS |
| 31 | + var assetsFS fs.FS |
| 32 | + var err error |
| 33 | + if isDev { |
| 34 | + publicFS = os.DirFS("./public") |
| 35 | + assetsFS = os.DirFS("./assets") |
| 36 | + |
| 37 | + logger.Info("using dev assets, make sure Vite is running") |
| 38 | + } else { |
| 39 | + publicFS, err = fs.Sub(distFS, "dist") |
| 40 | + if err != nil { |
| 41 | + return nil, fmt.Errorf("failed to create sub-filesystem for 'dist' directory: %w", err) |
| 42 | + } |
| 43 | + assetsFS, err = fs.Sub(publicFS, "assets") |
| 44 | + if err != nil { |
| 45 | + return nil, fmt.Errorf("failed to create sub-filesystem for 'dist/assets' directory: %w", err) |
| 46 | + } |
| 47 | + |
| 48 | + logger.Info("using prod assets") |
| 49 | + } |
| 50 | + |
| 51 | + var manifest Manifest |
| 52 | + if !isDev { |
| 53 | + err = parseManifest(publicFS, &manifest) |
| 54 | + if err != nil { |
| 55 | + return nil, err |
| 56 | + } |
| 57 | + } |
| 58 | + |
| 59 | + return &Vite{ |
| 60 | + IsDev: isDev, |
| 61 | + PublicFS: publicFS, |
| 62 | + AssetsFS: assetsFS, |
| 63 | + Manifest: manifest, |
| 64 | + DevPrefix: "http://localhost:5173", |
| 65 | + ProdPrefix: "", |
| 66 | + }, nil |
| 67 | +} |
| 68 | + |
| 69 | +func parseManifest(distFS fs.FS, manifest *Manifest) error { |
| 70 | + mf, err := distFS.Open(".vite/manifest.json") |
| 71 | + if err != nil { |
| 72 | + return fmt.Errorf("failed to open manifest file: %w", err) |
| 73 | + } |
| 74 | + defer mf.Close() |
| 75 | + |
| 76 | + err = json.NewDecoder(mf).Decode(manifest) |
| 77 | + if err != nil { |
| 78 | + return fmt.Errorf("failed to parse manifest file: %w", err) |
| 79 | + } |
| 80 | + |
| 81 | + return nil |
| 82 | +} |
| 83 | + |
| 84 | +func (v *Vite) Fragment(entries []string) template.HTML { |
| 85 | + var sb strings.Builder |
| 86 | + |
| 87 | + if v.IsDev { |
| 88 | + sb.WriteString(v.makeScriptTag("@vite/client")) |
| 89 | + |
| 90 | + for _, entry := range entries { |
| 91 | + if isCSS(entry) { |
| 92 | + sb.WriteString(v.makeStylesheetTag(entry)) |
| 93 | + } else { |
| 94 | + sb.WriteString(v.makeScriptTag(entry)) |
| 95 | + } |
| 96 | + } |
| 97 | + } else { |
| 98 | + for _, entry := range entries { |
| 99 | + chunk, ok := v.Manifest[entry] |
| 100 | + if !ok { |
| 101 | + continue |
| 102 | + } |
| 103 | + |
| 104 | + if isCSS(entry) { |
| 105 | + sb.WriteString(v.makeStylesheetTag(chunk.File)) |
| 106 | + } else { |
| 107 | + sb.WriteString(v.makeScriptTag(chunk.File)) |
| 108 | + } |
| 109 | + } |
| 110 | + } |
| 111 | + |
| 112 | + return template.HTML(sb.String()) |
| 113 | +} |
| 114 | + |
| 115 | +func (v *Vite) makeStylesheetTag(path string) string { |
| 116 | + var prefix string |
| 117 | + if v.IsDev { |
| 118 | + prefix = v.DevPrefix |
| 119 | + } else { |
| 120 | + prefix = v.ProdPrefix |
| 121 | + } |
| 122 | + |
| 123 | + return fmt.Sprintf( |
| 124 | + `<link rel="stylesheet" href="%s/%s" />`, |
| 125 | + prefix, |
| 126 | + path, |
| 127 | + ) |
| 128 | +} |
| 129 | + |
| 130 | +func (v *Vite) makeScriptTag(path string) string { |
| 131 | + var prefix string |
| 132 | + if v.IsDev { |
| 133 | + prefix = v.DevPrefix |
| 134 | + } else { |
| 135 | + prefix = v.ProdPrefix |
| 136 | + } |
| 137 | + |
| 138 | + return fmt.Sprintf( |
| 139 | + `<script type="module" src="%s/%s"></script>`, |
| 140 | + prefix, |
| 141 | + path, |
| 142 | + ) |
| 143 | +} |
| 144 | + |
| 145 | +func isCSS(path string) bool { |
| 146 | + return strings.HasSuffix(path, ".css") |
| 147 | +} |
0 commit comments