Cache mirror list

[Vexu]

I meant to do this as a follow up to #438 but then forgot about it.

[Techatrix]

The mirror fetching could also be made lazy to further reduce requests made for community-mirrors.txt.

This may also make it viable to report a message to the user if we failed to fetch the mirror list.

diff --git a/src/versionManager.ts b/src/versionManager.ts
index 3e595e7..14d1643 100644
--- a/src/versionManager.ts
+++ b/src/versionManager.ts
@@ -36,7 +36,7 @@ export interface Config {
      * `"version"` for Zig, `"--version"` for ZLS
      */
     versionArg: string;
-    mirrorUrls: vscode.Uri[];
+    getMirrorUrls: () => Promise<vscode.Uri[]>;
     canonicalUrl: {
         release: vscode.Uri;
         nightly: vscode.Uri;
@@ -93,7 +93,7 @@ async function installGuarded(config: Config, version: semver.SemVer): Promise<s
         throw new Error(`Can't install ${config.title} because 'tar' could not be found`);
     }
 
-    const mirrors = [...config.mirrorUrls]
+    const mirrors = [...(await config.getMirrorUrls())]
         .map((mirror) => ({ mirror, sort: Math.random() }))
         .sort((a, b) => a.sort - b.sort)
         .map(({ mirror }) => mirror);
diff --git a/src/zigSetup.ts b/src/zigSetup.ts
index 6c6e7ad..e8d5021 100644
--- a/src/zigSetup.ts
+++ b/src/zigSetup.ts
@@ -713,7 +713,9 @@ export async function setupZig(context: vscode.ExtensionContext) {
         /** https://ziglang.org/download */
         minisignKey: minisign.parseKey("RWSGOq2NVecA2UPNdBUZykf1CCb147pkmdtYxgb3Ti+JO/wCYvhbAb/U"),
         versionArg: "version",
-        mirrorUrls: await getMirrors(context),
+        getMirrorUrls() {
+            return getMirrors(context);
+        },
         canonicalUrl: {
             release: vscode.Uri.parse("https://ziglang.org/download"),
             nightly: vscode.Uri.parse("https://ziglang.org/builds"),
diff --git a/src/zls.ts b/src/zls.ts
index 0a72eb2..0bdc3b6 100644
--- a/src/zls.ts
+++ b/src/zls.ts
@@ -511,7 +511,9 @@ export async function activate(context: vscode.ExtensionContext) {
         /** https://github.com/zigtools/release-worker */
         minisignKey: minisign.parseKey("RWR+9B91GBZ0zOjh6Lr17+zKf5BoSuFvrx2xSeDE57uIYvnKBGmMjOex"),
         versionArg: "--version",
-        mirrorUrls: [],
+        getMirrorUrls() {
+            return Promise.resolve([]);
+        },
         canonicalUrl: {
             release: vscode.Uri.parse("https://builds.zigtools.org"),
             nightly: vscode.Uri.parse("https://builds.zigtools.org"),

[Vexu]

The mirror fetching could also be made lazy to further reduce requests made for community-mirrors.txt.

Even better, thanks!