refactor(cli): fetch application template without giget

Author: endersonmaia

.changeset/sour-states-dig.md

@@ -0,0 +1,5 @@
+---
+"@cartesi/cli": patch
+---
+
+fetch application template without giget dependency

apps/cli/package.json

@@ -30,9 +30,9 @@
         "execa": "^9.6.0",
         "fs-extra": "^11.3.2",
         "get-port": "^7.1.0",
-        "giget": "^2.0.0",
         "listr2": "^9.0.4",
         "lookpath": "^1.2.3",
+        "modern-tar": "^0.7.3",
         "ora": "^9.0.0",
         "p-retry": "^7.0.0",
         "progress-stream": "^2.0.0",

apps/cli/src/template.ts

@@ -1,23 +1,56 @@
-import type { TemplateProvider } from "giget";
-import { type DownloadTemplateResult, downloadTemplate } from "giget";
+import { ensureDir } from "fs-extra";
+import { unpackTar } from "modern-tar/fs";
+import path from "node:path";
+import { pipeline } from "node:stream/promises";
+import { createGunzip } from "node:zlib";
+
+export interface DownloadTemplateResult {
+    dir: string;
+    source: string;
+}
 
 export const download = async (
     template: string,
     branch: string,
     out: string,
 ): Promise<DownloadTemplateResult> => {
-    const cartesiProvider: TemplateProvider = async (input) => {
-        return {
-            name: "cartesi",
-            subdir: input,
-            url: "https://github.com/cartesi/application-templates",
-            tar: `https://codeload.github.com/cartesi/application-templates/tar.gz/refs/heads/${branch}`,
-        };
-    };
+    const repoUrl = "https://github.com/cartesi/application-templates";
+    const tarballUrl = `https://codeload.github.com/cartesi/application-templates/tar.gz/refs/heads/${branch}`;
 
-    const input = `cartesi:${template}`;
-    return downloadTemplate(input, {
-        dir: out,
-        providers: { cartesi: cartesiProvider },
+    // Ensure output directory exists
+    await ensureDir(out);
+
+    // Download the tarball
+    const response = await fetch(tarballUrl);
+    if (!response.ok) {
+        throw new Error(`Failed to download template: ${response.statusText}`);
+    }
+
+    // Stream download → gunzip → extract with filtering
+    // GitHub tarball structure: application-templates-{branch}/{template}/...
+    // We need to extract only files within the template subdirectory
+    const extractStream = unpackTar(out, {
+        filter: (header) => {
+            // remove first path segment
+            const pathname = header.name.split("/").splice(1).join("/");
+            return pathname.startsWith(template);
+        },
+        map: (header) => {
+            // remove first path segment
+            const pathname = header.name.split("/").splice(1).join("/");
+            header.name = path.relative(template, pathname);
+            return header;
+        },
     });
+
+    await pipeline(
+        response.body as ReadableStream,
+        createGunzip(),
+        extractStream,
+    );
+
+    return {
+        dir: out,
+        source: repoUrl,
+    };
 };