|
| 1 | +package commands |
| 2 | + |
| 3 | +import ( |
| 4 | + _ "embed" |
| 5 | + "errors" |
| 6 | + "fmt" |
| 7 | + "os" |
| 8 | + "os/exec" |
| 9 | + "path/filepath" |
| 10 | + "strings" |
| 11 | + "sync" |
| 12 | + |
| 13 | + "github.com/evanw/esbuild/pkg/api" |
| 14 | + "gopkg.in/yaml.v3" |
| 15 | + |
| 16 | + "github.com/wapc/cli-go/pkg/js" |
| 17 | +) |
| 18 | + |
| 19 | +type Context struct{} |
| 20 | + |
| 21 | +type GenerateCmd struct { |
| 22 | + Config string `arg:"" help:"The code generation configuration file" type:"existingfile"` |
| 23 | + |
| 24 | + prettier *js.JS |
| 25 | + once sync.Once |
| 26 | +} |
| 27 | + |
| 28 | +type Config struct { |
| 29 | + Schema string `json:"schema" yaml:"schema"` |
| 30 | + Generates map[string]Target `json:"generates" yaml:"generates"` |
| 31 | +} |
| 32 | + |
| 33 | +type Target struct { |
| 34 | + Module string `json:"module" yaml:"module"` |
| 35 | + VisitorClass string `json:"visitorClass" yaml:"visitorClass"` |
| 36 | + IfNotExists bool `json:"ifNotExists,omitempty" yaml:"ifNotExists,omitempty"` |
| 37 | + Config map[string]interface{} `json:"config,omitempty" yaml:"config,omitempty"` |
| 38 | +} |
| 39 | + |
| 40 | +const generateTemplate = `import { parse } from "@wapc/widl"; |
| 41 | +import { Context, Writer } from "@wapc/widl/ast"; |
| 42 | +import { {{visitorClass}} } from "{{module}}"; |
| 43 | +
|
| 44 | +export function generate(widl, config) { |
| 45 | + const doc = parse(widl); |
| 46 | + const context = new Context(config); |
| 47 | +
|
| 48 | + const writer = new Writer(); |
| 49 | + const visitor = new {{visitorClass}}(writer); |
| 50 | + doc.accept(context, visitor); |
| 51 | + let source = writer.string(); |
| 52 | + console.log(source); |
| 53 | +
|
| 54 | + return source; |
| 55 | +} |
| 56 | +
|
| 57 | +js_exports["generate"] = generate;` |
| 58 | + |
| 59 | +func (c *GenerateCmd) Run(ctx *Context) error { |
| 60 | + defer func() { |
| 61 | + if c.prettier != nil { |
| 62 | + c.prettier.Dispose() |
| 63 | + } |
| 64 | + }() |
| 65 | + |
| 66 | + configBytes, err := os.ReadFile(c.Config) |
| 67 | + if err != nil { |
| 68 | + return err |
| 69 | + } |
| 70 | + |
| 71 | + configs := strings.Split(string(configBytes), "---") |
| 72 | + for _, config := range configs { |
| 73 | + if err := c.generate(config); err != nil { |
| 74 | + return err |
| 75 | + } |
| 76 | + } |
| 77 | + |
| 78 | + return nil |
| 79 | +} |
| 80 | + |
| 81 | +func (c *GenerateCmd) generate(configYAML string) error { |
| 82 | + var config Config |
| 83 | + if err := yaml.Unmarshal([]byte(configYAML), &config); err != nil { |
| 84 | + return err |
| 85 | + } |
| 86 | + |
| 87 | + schemaBytes, err := os.ReadFile(config.Schema) |
| 88 | + if err != nil { |
| 89 | + return err |
| 90 | + } |
| 91 | + schema := string(schemaBytes) |
| 92 | + |
| 93 | + homeDir, err := getHomeDirectory() |
| 94 | + if err != nil { |
| 95 | + return err |
| 96 | + } |
| 97 | + srcDir := filepath.Join(homeDir, "src") |
| 98 | + |
| 99 | + for filename, target := range config.Generates { |
| 100 | + if target.IfNotExists { |
| 101 | + _, err := os.Stat(filename) |
| 102 | + if err != nil && !os.IsNotExist(err) { |
| 103 | + return err |
| 104 | + } |
| 105 | + if err == nil { |
| 106 | + fmt.Printf("Skipping %s...\n", filename) |
| 107 | + continue |
| 108 | + } |
| 109 | + } |
| 110 | + fmt.Printf("Generating %s...\n", filename) |
| 111 | + generateTS := generateTemplate |
| 112 | + generateTS = strings.Replace(generateTS, "{{module}}", target.Module, 1) |
| 113 | + generateTS = strings.Replace(generateTS, "{{visitorClass}}", target.VisitorClass, -1) |
| 114 | + |
| 115 | + result := api.Build(api.BuildOptions{ |
| 116 | + Stdin: &api.StdinOptions{ |
| 117 | + Contents: generateTS, |
| 118 | + Sourcefile: "generate.ts", |
| 119 | + ResolveDir: srcDir, |
| 120 | + }, |
| 121 | + Bundle: true, |
| 122 | + NodePaths: []string{srcDir}, |
| 123 | + LogLevel: api.LogLevelInfo, |
| 124 | + }) |
| 125 | + if len(result.Errors) > 0 { |
| 126 | + return fmt.Errorf("esbuild returned errors: %v", result.Errors) |
| 127 | + } |
| 128 | + if len(result.OutputFiles) != 1 { |
| 129 | + return errors.New("esbuild did not produce exactly 1 output file") |
| 130 | + } |
| 131 | + |
| 132 | + bundle := string(result.OutputFiles[0].Contents) |
| 133 | + |
| 134 | + j, err := js.Compile(bundle) |
| 135 | + if err != nil { |
| 136 | + return err |
| 137 | + } |
| 138 | + defer j.Dispose() |
| 139 | + |
| 140 | + if target.Config == nil { |
| 141 | + target.Config = map[string]interface{}{} |
| 142 | + } |
| 143 | + res, err := j.Invoke("generate", schema, target.Config) |
| 144 | + if err != nil { |
| 145 | + return err |
| 146 | + } |
| 147 | + |
| 148 | + source := res.(string) |
| 149 | + ext := filepath.Ext(filename) |
| 150 | + switch ext { |
| 151 | + case ".ts": |
| 152 | + source, err = c.formatTypeScript(source) |
| 153 | + if err != nil { |
| 154 | + return err |
| 155 | + } |
| 156 | + } |
| 157 | + |
| 158 | + dir := filepath.Dir(filename) |
| 159 | + if dir != "" { |
| 160 | + if err = os.MkdirAll(dir, 0777); err != nil { |
| 161 | + return err |
| 162 | + } |
| 163 | + } |
| 164 | + if err = os.WriteFile(filename, []byte(source), 0666); err != nil { |
| 165 | + return err |
| 166 | + } |
| 167 | + } |
| 168 | + |
| 169 | + // Some CLI-based formatters actually check for types referenced in other files |
| 170 | + // so we must call these after all the files are generated. |
| 171 | + for filename := range config.Generates { |
| 172 | + ext := filepath.Ext(filename) |
| 173 | + switch ext { |
| 174 | + case ".rs": |
| 175 | + fmt.Printf("Formatting %s...\n", filename) |
| 176 | + if err = formatRust(filename); err != nil { |
| 177 | + return err |
| 178 | + } |
| 179 | + case ".go": |
| 180 | + fmt.Printf("Formatting %s...\n", filename) |
| 181 | + if err = formatGolang(filename); err != nil { |
| 182 | + return err |
| 183 | + } |
| 184 | + } |
| 185 | + } |
| 186 | + |
| 187 | + return nil |
| 188 | +} |
| 189 | + |
| 190 | +//go:embed prettier.js |
| 191 | +var prettierSource string |
| 192 | + |
| 193 | +func (c *GenerateCmd) formatTypeScript(source string) (string, error) { |
| 194 | + var err error |
| 195 | + c.once.Do(func() { |
| 196 | + c.prettier, err = js.Compile(prettierSource) |
| 197 | + }) |
| 198 | + if err != nil { |
| 199 | + return "", err |
| 200 | + } |
| 201 | + |
| 202 | + res, err := c.prettier.Invoke("formatTypeScript", source) |
| 203 | + if err != nil { |
| 204 | + return "", err |
| 205 | + } |
| 206 | + |
| 207 | + return res.(string), nil |
| 208 | +} |
| 209 | + |
| 210 | +func formatRust(filename string) error { |
| 211 | + cmd := exec.Command("rustfmt", filename) |
| 212 | + cmd.Stdout = os.Stdout |
| 213 | + cmd.Stderr = os.Stderr |
| 214 | + return cmd.Run() |
| 215 | +} |
| 216 | + |
| 217 | +func formatGolang(filename string) error { |
| 218 | + cmd := exec.Command("gofmt", "-w", filename) |
| 219 | + cmd.Stdout = os.Stdout |
| 220 | + cmd.Stderr = os.Stderr |
| 221 | + return cmd.Run() |
| 222 | +} |
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