Fix deno task gen for Neovim 0.11+

Neovim 0.11+ removed builtin.txt and eval.txt files. Add fallback
support to use vimfn.txt and vimeval.txt respectively for newer
versions while maintaining backward compatibility.

Fixes vim-denops/denops.vim#459

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: lambdalisue

.scripts/gen-function/gen-function.ts

@@ -41,22 +41,26 @@ const vimHelpDownloadUrls = [
   `https://raw.githubusercontent.com/vim/vim/v${VIM_VERSION}/runtime/doc/testing.txt`,
   `https://raw.githubusercontent.com/vim/vim/v${VIM_VERSION}/runtime/doc/textprop.txt`,
 ];
-for (const vimHelpDownloadUrl of vimHelpDownloadUrls) {
-  console.log(`Download from ${vimHelpDownloadUrl}`);
-}
 const vimHelps = await Promise.all(vimHelpDownloadUrls.map(downloadString));
 const vimDefs = parse(vimHelps.join("\n"));
 const vimFnSet = new Set(vimDefs.map((def) => def.fn)).difference(manualFnSet);
 
 const nvimHelpDownloadUrls = [
   `https://raw.githubusercontent.com/neovim/neovim/v${NVIM_VERSION}/runtime/doc/api.txt`,
-  `https://raw.githubusercontent.com/neovim/neovim/v${NVIM_VERSION}/runtime/doc/builtin.txt`,
-  `https://raw.githubusercontent.com/neovim/neovim/v${NVIM_VERSION}/runtime/doc/eval.txt`,
+  [
+    `https://raw.githubusercontent.com/neovim/neovim/v${NVIM_VERSION}/runtime/doc/builtin.txt`,
+    // Neovim 0.11+ removed "builtin.txt", but "vimfn.txt" seems to be equivalent.
+    // https://github.com/neovim/neovim/pull/24493
+    `https://raw.githubusercontent.com/neovim/neovim/v${NVIM_VERSION}/runtime/doc/vimfn.txt`,
+  ],
+  [
+    `https://raw.githubusercontent.com/neovim/neovim/v${NVIM_VERSION}/runtime/doc/eval.txt`,
+    // Neovim 0.11+ removed "eval.txt", but "vimeval.txt" seems to be equivalent.
+    // https://github.com/neovim/neovim/pull/24493
+    `https://raw.githubusercontent.com/neovim/neovim/v${NVIM_VERSION}/runtime/doc/vimeval.txt`,
+  ],
   `https://raw.githubusercontent.com/neovim/neovim/v${NVIM_VERSION}/runtime/doc/sign.txt`,
 ];
-for (const nvimHelpDownloadUrl of nvimHelpDownloadUrls) {
-  console.log(`Download from ${nvimHelpDownloadUrl}`);
-}
 const nvimHelps = await Promise.all(nvimHelpDownloadUrls.map(downloadString));
 const nvimDefs = parse(nvimHelps.join("\n"));
 const nvimFnSet = new Set(nvimDefs.map((def) => def.fn)).difference(

.scripts/utils.ts

@@ -4,12 +4,20 @@ import { toText } from "@std/streams/to-text";
  * Downloads a text file and returns the contents.
  * Throws error if fetch fails.
  */
-export async function downloadString(url: string): Promise<string> {
-  const response = await fetch(url);
-  if (response.status >= 400 || !response.body) {
-    throw new Error(`Failed to read ${url}`);
+export async function downloadString(urls: string | string[]): Promise<string> {
+  urls = Array.isArray(urls) ? urls : [urls];
+  for (const url of urls) {
+    console.log(`Download from ${url}`);
+    const response = await fetch(url);
+    if (response.status >= 400 || !response.body) {
+      console.debug(
+        `Failed to download ${url}. Fallback to next URL if exists.`,
+      );
+      continue;
+    }
+    return await toText(response.body);
   }
-  return await toText(response.body);
+  throw new Error(`Failed to download from ${urls.join(", ")}`);
 }
 
 /**

.scripts/utils_test.ts

@@ -47,7 +47,8 @@ Deno.test(downloadString.name, async (t) => {
 
   await t.step("Throws error if fetch fails", async () => {
     const url = "https://example.net/foo.ts";
-    const expectedMessage = "Failed to read https://example.net/foo.ts";
+    const expectedMessage =
+      "Failed to download from https://example.net/foo.ts";
     await mockFetch({
       init: { status: 404 },
       async fn() {