microsoft/typespec
Publicmirrored from https://github.com/microsoft/typespecAvailable
packages/compiler/init/init.ts
281lines · modecode
| 1 | import { readdir } from "fs/promises"; |
| 2 | import jsyaml from "js-yaml"; |
| 3 | import Mustache from "mustache"; |
| 4 | import prompts from "prompts"; |
| 5 | import { CadlConfigFilename } from "../config/config-loader.js"; |
| 6 | import { logDiagnostics } from "../core/diagnostics.js"; |
| 7 | import { formatCadl } from "../core/formatter.js"; |
| 8 | import { getBaseFileName, joinPaths } from "../core/path-utils.js"; |
| 9 | import { SchemaValidator } from "../core/schema-validator.js"; |
| 10 | import { CompilerHost, SourceFile } from "../core/types.js"; |
| 11 | import { readUrlOrPath, resolveRelativeUrlOrPath } from "../core/util.js"; |
| 12 | import { InitTemplate, InitTemplateDefinitionsSchema, InitTemplateFile } from "./init-template.js"; |
| 13 | |
| 14 | interface ScaffoldingConfig extends InitTemplate { |
| 15 | /** |
| 16 | * Path where this template was laoded from. |
| 17 | */ |
| 18 | templateUri: string; |
| 19 | |
| 20 | /** |
| 21 | * Directory where the project should be initialized. |
| 22 | */ |
| 23 | directory: string; |
| 24 | |
| 25 | /** |
| 26 | * Name of the project. |
| 27 | */ |
| 28 | name: string; |
| 29 | |
| 30 | /** |
| 31 | * List of libraries to include |
| 32 | */ |
| 33 | libraries: string[]; |
| 34 | |
| 35 | /** |
| 36 | * Custom parameters provided in the tempalates. |
| 37 | */ |
| 38 | parameters: Record<string, any>; |
| 39 | } |
| 40 | |
| 41 | export async function initCadlProject( |
| 42 | host: CompilerHost, |
| 43 | directory: string, |
| 44 | templatesUrl?: string |
| 45 | ) { |
| 46 | if (!(await confirmDirectoryEmpty(directory))) { |
| 47 | return; |
| 48 | } |
| 49 | const folderName = getBaseFileName(directory); |
| 50 | |
| 51 | const template = await selectTemplate(host, templatesUrl); |
| 52 | const { name } = await prompts([ |
| 53 | { |
| 54 | type: "text", |
| 55 | name: "name", |
| 56 | message: `Project name`, |
| 57 | initial: folderName, |
| 58 | }, |
| 59 | ]); |
| 60 | |
| 61 | const libraries = await selectLibraries(template); |
| 62 | const parameters = await promptCustomParameters(template); |
| 63 | const scaffoldingConfig: ScaffoldingConfig = { |
| 64 | ...template, |
| 65 | templateUri: templatesUrl ?? ".", |
| 66 | libraries, |
| 67 | name, |
| 68 | directory, |
| 69 | parameters, |
| 70 | }; |
| 71 | await scaffoldNewProject(host, scaffoldingConfig); |
| 72 | } |
| 73 | |
| 74 | async function promptCustomParameters(template: InitTemplate): Promise<Record<string, any>> { |
| 75 | if (!template.inputs) { |
| 76 | return {}; |
| 77 | } |
| 78 | |
| 79 | const promptList = [...Object.entries(template.inputs)].map(([name, input]) => { |
| 80 | return { |
| 81 | name, |
| 82 | type: input.type, |
| 83 | message: input.description, |
| 84 | initial: input.initialValue, |
| 85 | }; |
| 86 | }); |
| 87 | return await prompts(promptList); |
| 88 | } |
| 89 | |
| 90 | async function isDirectoryEmpty(directory: string) { |
| 91 | try { |
| 92 | const files = await readdir(directory); |
| 93 | return files.length === 0; |
| 94 | } catch { |
| 95 | return true; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | async function confirmDirectoryEmpty(directory: string) { |
| 100 | if (await isDirectoryEmpty(directory)) { |
| 101 | return true; |
| 102 | } |
| 103 | |
| 104 | return confirm( |
| 105 | `Folder '${directory}' is not empty. Are you sure you want to initialize a new project here?` |
| 106 | ); |
| 107 | } |
| 108 | |
| 109 | const builtInTemplates: Record<string, InitTemplate> = { |
| 110 | empty: { |
| 111 | title: "Empty project", |
| 112 | description: "Create an empty project.", |
| 113 | libraries: [], |
| 114 | }, |
| 115 | rest: { |
| 116 | title: "Generic Rest API", |
| 117 | description: "Create a project representing a generic Rest API", |
| 118 | libraries: ["@cadl-lang/rest", "@cadl-lang/openapi3"], |
| 119 | config: { |
| 120 | emitters: { |
| 121 | "@cadl-lang/openapi3": true, |
| 122 | }, |
| 123 | }, |
| 124 | }, |
| 125 | }; |
| 126 | |
| 127 | async function confirm(message: string): Promise<boolean> { |
| 128 | const { confirm } = await prompts({ |
| 129 | name: "confirm", |
| 130 | type: "confirm", |
| 131 | message, |
| 132 | initial: true, |
| 133 | }); |
| 134 | return confirm; |
| 135 | } |
| 136 | |
| 137 | async function downloadTemplates( |
| 138 | host: CompilerHost, |
| 139 | templatesUrl: string |
| 140 | ): Promise<Record<string, InitTemplate>> { |
| 141 | const file = await readUrlOrPath(host, templatesUrl); |
| 142 | |
| 143 | const json = JSON.parse(file.text); |
| 144 | validateTemplateDefinitions(host, json, file); |
| 145 | return json; |
| 146 | } |
| 147 | |
| 148 | async function selectTemplate( |
| 149 | host: CompilerHost, |
| 150 | templatesUrl: string | undefined |
| 151 | ): Promise<InitTemplate> { |
| 152 | const templates = |
| 153 | templatesUrl === undefined ? builtInTemplates : await downloadTemplates(host, templatesUrl); |
| 154 | return promptTemplateSelection(templates); |
| 155 | } |
| 156 | |
| 157 | async function promptTemplateSelection( |
| 158 | templates: Record<string, InitTemplate> |
| 159 | ): Promise<InitTemplate> { |
| 160 | const { templateName } = await prompts({ |
| 161 | type: "select", |
| 162 | name: "templateName", |
| 163 | message: "Please select a template", |
| 164 | choices: Object.entries(templates).map(([id, template]) => { |
| 165 | return { value: id, description: template.description, title: template.title }; |
| 166 | }), |
| 167 | }); |
| 168 | const template = templates[templateName]; |
| 169 | if (!template) { |
| 170 | throw new Error(`Unexpected error: Cannot find template ${templateName}`); |
| 171 | } |
| 172 | return template; |
| 173 | } |
| 174 | |
| 175 | async function selectLibraries(template: InitTemplate): Promise<string[]> { |
| 176 | if (template.libraries.length === 0) { |
| 177 | return []; |
| 178 | } |
| 179 | |
| 180 | const libraryChoices = template.libraries.map((x) => ({ name: x, description: "" })); |
| 181 | |
| 182 | const { libraries } = await prompts({ |
| 183 | type: "multiselect", |
| 184 | name: "libraries", |
| 185 | message: "Update the libraries?", |
| 186 | choices: libraryChoices.map((x) => { |
| 187 | return { |
| 188 | title: x.name, |
| 189 | description: x.description, |
| 190 | value: x.name, |
| 191 | selected: true, |
| 192 | }; |
| 193 | }), |
| 194 | initial: template.libraries as any, |
| 195 | }); |
| 196 | |
| 197 | return libraries; |
| 198 | } |
| 199 | |
| 200 | export async function scaffoldNewProject(host: CompilerHost, config: ScaffoldingConfig) { |
| 201 | await writePackageJson(host, config); |
| 202 | await writeConfig(host, config); |
| 203 | await writeMain(host, config); |
| 204 | await writeFiles(host, config); |
| 205 | |
| 206 | // eslint-disable-next-line no-console |
| 207 | console.log("Cadl init completed. You can run `cadl install` now to install dependencies."); |
| 208 | } |
| 209 | |
| 210 | async function writePackageJson(host: CompilerHost, config: ScaffoldingConfig) { |
| 211 | const dependencies: Record<string, string> = { |
| 212 | "@cadl-lang/compiler": "latest", |
| 213 | }; |
| 214 | |
| 215 | for (const library of config.libraries) { |
| 216 | dependencies[library] = "latest"; |
| 217 | } |
| 218 | |
| 219 | const packageJson = { |
| 220 | name: config.name, |
| 221 | dependencies, |
| 222 | private: true, |
| 223 | }; |
| 224 | |
| 225 | return host.writeFile( |
| 226 | joinPaths(config.directory, "package.json"), |
| 227 | JSON.stringify(packageJson, null, 2) |
| 228 | ); |
| 229 | } |
| 230 | |
| 231 | async function writeConfig(host: CompilerHost, config: ScaffoldingConfig) { |
| 232 | if (!config.config) { |
| 233 | return; |
| 234 | } |
| 235 | const content = jsyaml.dump(config.config); |
| 236 | return host.writeFile(joinPaths(config.directory, CadlConfigFilename), content); |
| 237 | } |
| 238 | |
| 239 | async function writeMain(host: CompilerHost, config: ScaffoldingConfig) { |
| 240 | const dependencies: Record<string, string> = {}; |
| 241 | |
| 242 | for (const library of config.libraries) { |
| 243 | dependencies[library] = "latest"; |
| 244 | } |
| 245 | |
| 246 | const lines = [...config.libraries.map((x) => `import "${x}";`), ""]; |
| 247 | const content = lines.join("\n"); |
| 248 | |
| 249 | return host.writeFile(joinPaths(config.directory, "main.cadl"), await formatCadl(content)); |
| 250 | } |
| 251 | |
| 252 | async function writeFiles(host: CompilerHost, config: ScaffoldingConfig) { |
| 253 | if (!config.files) { |
| 254 | return; |
| 255 | } |
| 256 | for (const file of config.files) { |
| 257 | await writeFile(host, config, file); |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | async function writeFile(host: CompilerHost, config: ScaffoldingConfig, file: InitTemplateFile) { |
| 262 | const template = await readUrlOrPath( |
| 263 | host, |
| 264 | resolveRelativeUrlOrPath(config.templateUri, file.path) |
| 265 | ); |
| 266 | const content = Mustache.render(template.text, config); |
| 267 | return host.writeFile(joinPaths(config.directory, file.destination), content); |
| 268 | } |
| 269 | |
| 270 | function validateTemplateDefinitions( |
| 271 | host: CompilerHost, |
| 272 | templates: unknown, |
| 273 | file: SourceFile |
| 274 | ): asserts templates is Record<string, InitTemplate> { |
| 275 | const validator = new SchemaValidator(InitTemplateDefinitionsSchema); |
| 276 | const diagnostics = validator.validate(templates, file); |
| 277 | if (diagnostics.length > 0) { |
| 278 | logDiagnostics(diagnostics, host.logSink); |
| 279 | throw new Error("Template contained error."); |
| 280 | } |
| 281 | } |
| 282 | |