Add workspace side panel with files and git

src/server/workspaces/fileContentService.ts

@@ -0,0 +1,61 @@
+import { readFile, stat } from "node:fs/promises";
+import { resolveInsideWorkspace } from "./pathSafety.js";
+
+export interface FileContentResponse {
+  path: string;
+  language?: string;
+  encoding: "utf8";
+  size: number;
+  modifiedAt: string;
+  content: string;
+  truncated: boolean;
+  binary: boolean;
+}
+
+const MAX_BYTES = 512 * 1024;
+
+export async function readWorkspaceFile(rootPath: string, path: string | undefined): Promise<FileContentResponse> {
+  if (path === undefined || path === "") throw new Error("path query parameter is required");
+  const { target, relativePath } = await resolveInsideWorkspace(rootPath, path);
+  const s = await stat(target);
+  if (!s.isFile()) throw new Error("Path is not a file");
+  const bytesToRead = Math.min(s.size, MAX_BYTES);
+  const buffer = (await readFile(target)).subarray(0, bytesToRead);
+  const binary = isProbablyBinary(buffer);
+  return {
+    path: relativePath,
+    ...languageForPath(relativePath),
+    encoding: "utf8",
+    size: s.size,
+    modifiedAt: s.mtime.toISOString(),
+    content: binary ? "" : buffer.toString("utf8"),
+    truncated: s.size > MAX_BYTES,
+    binary,
+  };
+}
+
+function isProbablyBinary(buffer: Buffer): boolean {
+  const sample = buffer.subarray(0, Math.min(buffer.length, 8192));
+  return sample.includes(0);
+}
+
+function languageForPath(path: string): { language?: string } {
+  const ext = path.split(".").pop()?.toLowerCase();
+  const language = ext === undefined ? undefined : ({
+    ts: "typescript",
+    tsx: "typescript",
+    js: "javascript",
+    jsx: "javascript",
+    json: "json",
+    md: "markdown",
+    css: "css",
+    html: "html",
+    py: "python",
+    rs: "rust",
+    go: "go",
+    sh: "shell",
+    yml: "yaml",
+    yaml: "yaml",
+  } as Record<string, string | undefined>)[ext];
+  return language === undefined ? {} : { language };
+}