Resolve Python via where on Windows

src/python-runtime.ts

@@ -28,6 +28,55 @@ async function canRun(command: string, args: string[]): Promise<boolean> {
   });
 }
 
+async function captureStdout(command: string, args: string[]): Promise<string | null> {
+  return await new Promise<string | null>((resolve) => {
+    const child = spawn(command, args, {
+      stdio: ["ignore", "pipe", "ignore"],
+      windowsHide: true,
+    });
+
+    let stdout = "";
+    child.stdout.on("data", (chunk: Buffer) => {
+      stdout += chunk.toString();
+    });
+
+    child.on("error", () => {
+      resolve(null);
+    });
+
+    child.on("exit", (code) => {
+      if (code === 0) {
+        resolve(stdout);
+        return;
+      }
+      resolve(null);
+    });
+  });
+}
+
+async function resolveWindowsExecutable(name: string): Promise<string | null> {
+  const stdout = await captureStdout("cmd.exe", ["/d", "/s", "/c", `where ${name}`]);
+  if (!stdout) {
+    return null;
+  }
+
+  const candidates = stdout
+    .split(/\r?\n/)
+    .map((line) => line.trim())
+    .filter((line) => line.length > 0);
+
+  for (const candidate of candidates) {
+    try {
+      await access(candidate, fsConstants.F_OK);
+      return candidate;
+    } catch {
+      // ignore
+    }
+  }
+
+  return null;
+}
+
 async function fileExists(target: string): Promise<boolean> {
   try {
     await access(target, fsConstants.X_OK);
@@ -64,6 +113,11 @@ export async function resolveBasePythonCommand(config: AppConfig): Promise<{ com
     ];
 
     for (const candidate of candidates) {
+      const absolute = await resolveWindowsExecutable(candidate.command);
+      if (absolute && (await canRun(absolute, candidate.args))) {
+        return { command: absolute, args: candidate.args };
+      }
+
       if (await canRun(candidate.command, candidate.args)) {
         return candidate;
       }