microsoft/typespec
Publicmirrored from https://github.com/microsoft/typespecAvailable
packages/compiler/cmd/runner.ts
68lines · modecode
| 1 | import { access, readFile, realpath, stat } from "fs/promises"; |
| 2 | import { join, resolve } from "path"; |
| 3 | import { fileURLToPath, pathToFileURL } from "url"; |
| 4 | import { resolveModule, ResolveModuleHost } from "../core/module-resolver.js"; |
| 5 | |
| 6 | /** |
| 7 | * Run script given by relative path from @cadl-lang/compiler package root. |
| 8 | * Prefer local install resolved from cwd over current package. |
| 9 | * |
| 10 | * Prevents loading two conflicting copies of Cadl modules from global and |
| 11 | * local package locations. |
| 12 | */ |
| 13 | export async function runScript(relativePath: string, backupPath: string): Promise<void> { |
| 14 | const packageRoot = await resolvePackageRoot(); |
| 15 | |
| 16 | if (packageRoot) { |
| 17 | let script = join(packageRoot, relativePath); |
| 18 | if (!(await checkFileExists(script)) && backupPath) { |
| 19 | script = join(packageRoot, backupPath); |
| 20 | } |
| 21 | const scriptUrl = pathToFileURL(script).toString(); |
| 22 | await import(scriptUrl); |
| 23 | } else { |
| 24 | throw new Error( |
| 25 | "Couldn't resolve Cadl compiler root. This is unexpected. Please file an issue at https://github.com/Microsoft/cadl." |
| 26 | ); |
| 27 | } |
| 28 | } |
| 29 | |
| 30 | function checkFileExists(file: string) { |
| 31 | return access(file) |
| 32 | .then(() => true) |
| 33 | .catch(() => false); |
| 34 | } |
| 35 | |
| 36 | async function resolvePackageRoot(): Promise<string> { |
| 37 | if (process.env.CADL_SKIP_COMPILER_RESOLVE === "1") { |
| 38 | return await getThisPackageRoot(); |
| 39 | } |
| 40 | |
| 41 | try { |
| 42 | const host: ResolveModuleHost = { |
| 43 | realpath, |
| 44 | readFile: async (path: string) => await readFile(path, "utf-8"), |
| 45 | stat, |
| 46 | }; |
| 47 | const resolved = await resolveModule(host, "@cadl-lang/compiler", { |
| 48 | baseDir: process.cwd(), |
| 49 | }); |
| 50 | if (resolved.type !== "module") { |
| 51 | throw new Error( |
| 52 | `Error resolving "@cadl-lang/compiler", expected to find a node module but found a file: "${resolved.path}".` |
| 53 | ); |
| 54 | } |
| 55 | return resolved.path; |
| 56 | } catch (err: any) { |
| 57 | if (err.code === "MODULE_NOT_FOUND") { |
| 58 | // Resolution from cwd failed: use current package. |
| 59 | return await getThisPackageRoot(); |
| 60 | } else { |
| 61 | throw err; |
| 62 | } |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | async function getThisPackageRoot() { |
| 67 | return resolve(await realpath(fileURLToPath(import.meta.url)), "../../.."); |
| 68 | } |
| 69 | |