From 7359b2c9d29f16edbca268f00b3ab7d71649f3c4 Mon Sep 17 00:00:00 2001
From: Shougo Matsushita <Shougo.Matsu@gmail.com>
Date: Sat, 3 Aug 2024 09:45:05 +0900
Subject: [PATCH] Detect deno cache errors

---
 denops/ddc/app.ts    | 29 ++++++++++++++++++++++-------
 denops/ddc/loader.ts | 17 ++++++++++++++++-
 denops/ddc/utils.ts  | 12 ++++++++++++
 3 files changed, 50 insertions(+), 8 deletions(-)

diff --git a/denops/ddc/app.ts b/denops/ddc/app.ts
index 0cfe7a0..1277b8b 100644
--- a/denops/ddc/app.ts
+++ b/denops/ddc/app.ts
@@ -20,6 +20,7 @@ import {
   vars,
 } from "./deps.ts";
 import { Loader } from "./loader.ts";
+import { isDenoCacheIssueError } from "./utils.ts";
 import { createCallbackContext } from "./callback.ts";
 import { getPreviewer, onCompleteDone, onEvent } from "./ext.ts";
 
@@ -160,13 +161,27 @@ export const main: Entrypoint = (denops: Denops) => {
     async loadConfig(arg1: unknown): Promise<void> {
       await lock.lock(async () => {
         const path = ensure(arg1, is.String) as string;
-        // NOTE: Import module with fragment so that reload works properly.
-        // https://github.com/vim-denops/denops.vim/issues/227
-        const mod = await import(
-          `${toFileUrl(path).href}#${performance.now()}`
-        );
-        const obj = new mod.Config();
-        await obj.config({ denops, contextBuilder, setAlias });
+        try {
+          // NOTE: Import module with fragment so that reload works properly.
+          // https://github.com/vim-denops/denops.vim/issues/227
+          const mod = await import(
+            `${toFileUrl(path).href}#${performance.now()}`
+          );
+          const obj = new mod.Config();
+          await obj.config({ denops, contextBuilder, setAlias });
+        } catch (e) {
+          if (isDenoCacheIssueError(e)) {
+            console.warn("*".repeat(80));
+            console.warn(`Deno module cache issue is detected.`);
+            console.warn(
+              `Execute '!deno cache --reload "${path}"' and restart Vim/Neovim.`,
+            );
+            console.warn("*".repeat(80));
+          }
+
+          console.error(`Failed to load file '${path}': ${e}`);
+          throw e;
+        }
       });
       return Promise.resolve();
     },
diff --git a/denops/ddc/loader.ts b/denops/ddc/loader.ts
index 72e399a..bda76ca 100644
--- a/denops/ddc/loader.ts
+++ b/denops/ddc/loader.ts
@@ -20,6 +20,7 @@ import {
   parse,
   toFileUrl,
 } from "./deps.ts";
+import { isDenoCacheIssueError } from "./utils.ts";
 import { mods } from "./_mods.js";
 
 export class Loader {
@@ -109,7 +110,21 @@ export class Loader {
 
   async registerPath(type: DdcExtType, path: string) {
     await this.#registerLock.lock(async () => {
-      await this.#register(type, path);
+      try {
+        await this.#register(type, path);
+      } catch (e) {
+        if (isDenoCacheIssueError(e)) {
+          console.warn("*".repeat(80));
+          console.warn(`Deno module cache issue is detected.`);
+          console.warn(
+            `Execute '!deno cache --reload "${path}"' and restart Vim/Neovim.`,
+          );
+          console.warn("*".repeat(80));
+        }
+
+        console.error(`Failed to load file '${path}': ${e}`);
+        throw e;
+      }
     });
   }
 
diff --git a/denops/ddc/utils.ts b/denops/ddc/utils.ts
index cc838aa..6281ec0 100644
--- a/denops/ddc/utils.ts
+++ b/denops/ddc/utils.ts
@@ -15,6 +15,18 @@ export async function convertKeywordPattern(
   return replaced;
 }
 
+// See https://github.com/vim-denops/denops.vim/issues/358 for details
+export function isDenoCacheIssueError(e: unknown): boolean {
+  const expects = [
+    "Could not find constraint in the list of versions: ", // Deno 1.40?
+    "Could not find version of ", // Deno 1.38
+  ] as const;
+  if (e instanceof TypeError) {
+    return expects.some((expect) => e.message.startsWith(expect));
+  }
+  return false;
+}
+
 function vimoption2ts(option: string): string {
   let hasDash = false;
   const patterns: string[] = [];