1 files changed, 79 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/web/deno/update/deps.ts b/nixpkgs/pkgs/development/web/deno/update/deps.ts
new file mode 100644
index 00000000000..beedeade3a8
--- /dev/null
+++ b/nixpkgs/pkgs/development/web/deno/update/deps.ts
@@ -0,0 +1,79 @@
+import {
+  getExistingVersion,
+  genValueRegExp,
+  logger,
+  nixPrefetchURL,
+  versionRegExp,
+  write,
+} from "./common.ts";
+
+const log = logger("deps");
+
+export interface Architecture {
+  nix: string;
+  rust: string;
+}
+interface PrefetchResult {
+  arch: Architecture;
+  sha256: string;
+}
+
+const getRustyV8Version = async (
+  owner: string,
+  repo: string,
+  version: string,
+) =>
+  fetch(
+    `https://github.com/${owner}/${repo}/raw/${version}/core/Cargo.toml`,
+  )
+    .then((res) => res.text())
+    .then((txt) =>
+      txt.match(genValueRegExp("rusty_v8", versionRegExp))?.shift()
+    );
+
+const archShaTasks = (version: string, arches: Architecture[]) =>
+  arches.map(async (arch: Architecture): Promise<PrefetchResult> => {
+    log("Fetching:", arch.nix);
+    const sha256 = await nixPrefetchURL(
+      [`https://github.com/denoland/rusty_v8/releases/download/v${version}/librusty_v8_release_${arch.rust}.a`],
+    );
+    log("Done:    ", arch.nix);
+    return { arch, sha256 };
+  });
+
+const templateDeps = (version: string, deps: PrefetchResult[]) =>
+  `# auto-generated file -- DO NOT EDIT!
+{}:
+rec {
+  rustyV8Lib = {
+    version = "${version}";
+    sha256s = {
+${deps.map((d) => `      ${d.arch.nix} = "${d.sha256}";`).join("\n")}
+    };
+  };
+}
+`;
+
+export async function updateDeps(
+  filePath: string,
+  owner: string,
+  repo: string,
+  denoVersion: string,
+  arches: Architecture[],
+) {
+  log("Starting deps update");
+  // 0.0.0
+  const version = await getRustyV8Version(owner, repo, denoVersion);
+  if (typeof version !== "string") {
+    throw "no rusty_v8 version";
+  }
+  log("rusty_v8 version:", version);
+  const existingVersion = await getExistingVersion(filePath);
+  if (version === existingVersion) {
+    log("Version already matches latest, skipping...");
+    return;
+  }
+  const archShaResults = await Promise.all(archShaTasks(version, arches));
+  await write(filePath, templateDeps(version, archShaResults));
+  log("Finished deps update");
+}