initial commit

src/root.ts

@@ -0,0 +1,40 @@
+import * as fs from "node:fs";
+import * as path from "node:path";
+import { pathToFileURL, fileURLToPath } from "node:url";
+import { servers } from "../server.ts";
+import type { ServerConfig } from "./types.ts";
+
+// Resolve File URI To Local Path
+export function uriToPath(uri: string): string {
+  return fileURLToPath(uri);
+}
+
+// Resolve Local Path To File URI
+export function pathToUri(p: string): string {
+  return pathToFileURL(path.resolve(p)).toString();
+}
+
+// Pick Server By File Extension - match[] entries are matched against the
+// file's extension (no dot). First server in the registry wins.
+export function pickServer(filePath: string): ServerConfig {
+  const ext = path.extname(filePath).replace(/^\./, "");
+  const hit = servers.find((s) => s.match.includes(ext));
+  if (!hit) {
+    throw new Error(`No LSP server registered for extension ".${ext}"`);
+  }
+  return hit;
+}
+
+// Find Project Root By Walking Upward - stops at the first directory
+// containing any rootMarker. Falls back to the file's directory.
+export function findRoot(filePath: string, markers: string[]): string {
+  let dir = path.dirname(path.resolve(filePath));
+  const { root } = path.parse(dir);
+  while (true) {
+    for (const m of markers) {
+      if (fs.existsSync(path.join(dir, m))) return dir;
+    }
+    if (dir === root) return path.dirname(path.resolve(filePath));
+    dir = path.dirname(dir);
+  }
+}