fix(cli): use 'where' instead of 'which' on Windows for FFmpeg and br… (#336)

* fix(cli): use 'where' instead of 'which' on Windows for FFmpeg and browser detection

- findFFmpeg() now uses 'where ffmpeg' on Windows, 'which ffmpeg' on Unix
- whichBinary() now uses 'where' on Windows, 'which' on Unix

Fixes FFmpeg detection failure on Windows where 'which' command doesn't exist.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* fix(cli): handle multi-line output from Windows 'where' command

Windows 'where' can return multiple paths (one per line) when there
are multiple matches on PATH. Take only the first non-empty line.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* fix(cli): extend Windows 'where' fix to whisper, tts, and clipboard modules

- whisper/manager.ts: whichBinary() now uses 'where' on Windows
- tts/synthesize.ts: findPython() now uses 'where' on Windows
- utils/clipboard.ts: detectProvider() now uses 'where' on Windows

All functions handle multi-line output from 'where' command.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

packages/cli/src/browser/ffmpeg.ts

@@ -2,12 +2,17 @@ import { execSync } from "node:child_process";
 
 export function findFFmpeg(): string | undefined {
   try {
-    const result = execSync("which ffmpeg", {
+    const cmd = process.platform === "win32" ? "where ffmpeg" : "which ffmpeg";
+    const output = execSync(cmd, {
       encoding: "utf-8",
       stdio: ["pipe", "pipe", "pipe"],
       timeout: 5000,
-    }).trim();
-    return result || undefined;
+    });
+    const first = output
+      .split(/\r?\n/)
+      .map((s) => s.trim())
+      .find(Boolean);
+    return first || undefined;
   } catch {
     return undefined;
   }

packages/cli/src/browser/manager.ts

@@ -38,12 +38,17 @@ const SYSTEM_CHROME_PATHS: ReadonlyArray<string> =
 
 function whichBinary(name: string): string | undefined {
   try {
-    const result = execSync(`which ${name}`, {
+    const cmd = process.platform === "win32" ? `where ${name}` : `which ${name}`;
+    const output = execSync(cmd, {
       encoding: "utf-8",
       stdio: ["pipe", "pipe", "pipe"],
       timeout: 5000,
-    }).trim();
-    return result || undefined;
+    });
+    const first = output
+      .split(/\r?\n/)
+      .map((s) => s.trim())
+      .find(Boolean);
+    return first || undefined;
   } catch {
     return undefined;
   }

packages/cli/src/tts/synthesize.ts

@@ -11,20 +11,26 @@ import { ensureModel, ensureVoices, DEFAULT_VOICE } from "./manager.js";
 function findPython(): string | undefined {
   for (const name of ["python3", "python"]) {
     try {
-      const result = execFileSync("which", [name], {
+      const cmd = process.platform === "win32" ? "where" : "which";
+      const output = execFileSync(cmd, [name], {
         encoding: "utf-8",
         stdio: ["pipe", "pipe", "pipe"],
         timeout: 5000,
-      }).trim();
+      });
+      const first = output
+        .split(/\r?\n/)
+        .map((s) => s.trim())
+        .find(Boolean);
+      if (!first) continue;
 
       // Verify it's Python 3
-      const version = execFileSync(result, ["--version"], {
+      const version = execFileSync(first, ["--version"], {
         encoding: "utf-8",
         stdio: ["pipe", "pipe", "pipe"],
         timeout: 5000,
       }).trim();
 
-      if (version.includes("Python 3")) return result;
+      if (version.includes("Python 3")) return first;
     } catch {
       // not found or not Python 3
     }

packages/cli/src/utils/clipboard.ts

@@ -31,9 +31,10 @@ function detectProvider(): ClipboardProvider | undefined {
     { cmd: "xclip", args: ["-selection", "clipboard"] },
     { cmd: "xsel", args: ["--clipboard", "--input"] },
   ];
+  const cmd = process.platform === "win32" ? "where" : "which";
   for (const p of candidates) {
-    const which = spawnSync("which", [p.cmd], { stdio: "ignore" });
-    if (which.status === 0) return p;
+    const result = spawnSync(cmd, [p.cmd], { stdio: "ignore" });
+    if (result.status === 0) return p;
   }
   return undefined;
 }

packages/cli/src/whisper/manager.ts

@@ -22,12 +22,17 @@ function getModelUrl(model: string): string {
 
 function whichBinary(name: string): string | undefined {
   try {
-    const result = execFileSync("which", [name], {
+    const cmd = process.platform === "win32" ? "where" : "which";
+    const output = execFileSync(cmd, [name], {
       encoding: "utf-8",
       stdio: ["pipe", "pipe", "pipe"],
       timeout: 5000,
-    }).trim();
-    return result || undefined;
+    });
+    const first = output
+      .split(/\r?\n/)
+      .map((s) => s.trim())
+      .find(Boolean);
+    return first || undefined;
   } catch {
     return undefined;
   }