refactor: standardize string formatting and improve code readability

with_ui.py

@@ -7,7 +7,7 @@ from flask import Flask, request, jsonify, Response, stream_with_context
 from flask_cors import CORS
 import time
 
-app = Flask(__name__, static_folder='.', static_url_path='')
+app = Flask(__name__, static_folder=".", static_url_path="")
 CORS(app)
 
 # Store active jobs: {job_id: {"lines": [], "done": bool, "error": bool}}
@@ -29,7 +29,7 @@ def run_ytdlp(job_id, cmd):
             stderr=subprocess.STDOUT,
             text=True,
             bufsize=1,
-            cwd=DOWNLOAD_DIR
+            cwd=DOWNLOAD_DIR,
         )
         for line in process.stdout:
             line = line.rstrip()
@@ -47,73 +47,79 @@ def run_ytdlp(job_id, cmd):
             jobs[job_id]["error"] = True
 
 
-@app.route('/')
+@app.route("/")
 def index():
-    return app.send_static_file('frontend.html')
+    return app.send_static_file("frontend.html")
 
 
-@app.route('/api/info', methods=['POST'])
+@app.route("/api/info", methods=["POST"])
 def get_info():
     data = request.json
-    url = data.get('url', '').strip()
-    cookies = data.get('cookies', '').strip()
+    url = data.get("url", "").strip()
+    cookies = data.get("cookies", "").strip()
 
     if not url:
         return jsonify({"error": "No URL provided"}), 400
 
-    cmd = [YTDLP_PATH, '--dump-json', '--no-playlist']
+    cmd = [YTDLP_PATH, "--dump-json", "--no-playlist"]
     if cookies:
-        cmd += ['--cookies', cookies]
-    cmd += ['--extractor-args', 'generic:impersonate', url]
+        cmd += ["--cookies", cookies]
+    cmd += ["--extractor-args", "generic:impersonate", url]
 
     try:
-        result = subprocess.run(cmd, capture_output=True, text=True, timeout=30, cwd=DOWNLOAD_DIR)
+        result = subprocess.run(
+            cmd, capture_output=True, text=True, timeout=30, cwd=DOWNLOAD_DIR
+        )
         if result.returncode != 0:
             return jsonify({"error": result.stderr or "Failed to fetch info"}), 400
         info = json.loads(result.stdout)
         formats = []
-        for f in info.get('formats', []):
-            formats.append({
-                "id": f.get('format_id'),
-                "ext": f.get('ext'),
-                "resolution": f.get('resolution') or f.get('format_note') or '',
-                "vcodec": f.get('vcodec', 'none'),
-                "acodec": f.get('acodec', 'none'),
-                "filesize": f.get('filesize') or f.get('filesize_approx'),
-                "tbr": f.get('tbr'),
-                "label": f.get('format'),
-            })
-        return jsonify({
-            "title": info.get('title', 'Unknown'),
-            "thumbnail": info.get('thumbnail'),
-            "duration": info.get('duration'),
-            "uploader": info.get('uploader'),
-            "formats": formats
-        })
+        for f in info.get("formats", []):
+            formats.append(
+                {
+                    "id": f.get("format_id"),
+                    "ext": f.get("ext"),
+                    "resolution": f.get("resolution") or f.get("format_note") or "",
+                    "vcodec": f.get("vcodec", "none"),
+                    "acodec": f.get("acodec", "none"),
+                    "filesize": f.get("filesize") or f.get("filesize_approx"),
+                    "tbr": f.get("tbr"),
+                    "label": f.get("format"),
+                }
+            )
+        return jsonify(
+            {
+                "title": info.get("title", "Unknown"),
+                "thumbnail": info.get("thumbnail"),
+                "duration": info.get("duration"),
+                "uploader": info.get("uploader"),
+                "formats": formats,
+            }
+        )
     except subprocess.TimeoutExpired:
         return jsonify({"error": "Timed out fetching video info"}), 408
     except Exception as e:
         return jsonify({"error": str(e)}), 500
 
 
-@app.route('/api/download', methods=['POST'])
+@app.route("/api/download", methods=["POST"])
 def start_download():
     data = request.json
-    url = data.get('url', '').strip()
-    format_id = data.get('format_id', '').strip()
-    cookies = data.get('cookies', '').strip()
-    extra_args = data.get('extra_args', '').strip()
+    url = data.get("url", "").strip()
+    format_id = data.get("format_id", "").strip()
+    cookies = data.get("cookies", "").strip()
+    extra_args = data.get("extra_args", "").strip()
 
     if not url:
         return jsonify({"error": "No URL provided"}), 400
 
     cmd = [YTDLP_PATH]
     if format_id:
-        cmd += ['-f', format_id]
-    cmd += ['--prefer-free-formats']
+        cmd += ["-f", format_id]
+    cmd += ["--prefer-free-formats"]
     if cookies:
-        cmd += ['--cookies', cookies]
-    cmd += ['--extractor-args', 'generic:impersonate']
+        cmd += ["--cookies", cookies]
+    cmd += ["--extractor-args", "generic:impersonate"]
     if extra_args:
         cmd += extra_args.split()
     cmd.append(url)
@@ -125,7 +131,7 @@ def start_download():
     return jsonify({"job_id": job_id})
 
 
-@app.route('/api/status/<job_id>')
+@app.route("/api/status/<job_id>")
 def job_status(job_id):
     def generate():
         sent = 0
@@ -135,20 +141,23 @@ def job_status(job_id):
             if not job:
                 yield f"data: {json.dumps({'error': 'Job not found'})}\n\n"
                 break
-            lines = job['lines']
+            lines = job["lines"]
             while sent < len(lines):
                 yield f"data: {json.dumps({'line': lines[sent]})}\n\n"
                 sent += 1
-            if job['done']:
+            if job["done"]:
                 yield f"data: {json.dumps({'done': True, 'error': job['error']})}\n\n"
                 break
             time.sleep(0.2)
 
-    return Response(stream_with_context(generate()), mimetype='text/event-stream',
-                    headers={'Cache-Control': 'no-cache', 'X-Accel-Buffering': 'no'})
+    return Response(
+        stream_with_context(generate()),
+        mimetype="text/event-stream",
+        headers={"Cache-Control": "no-cache", "X-Accel-Buffering": "no"},
+    )
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     print(f"[yt-dlp UI] Serving on http://localhost:5000")
     print(f"[yt-dlp UI] Download directory: {DOWNLOAD_DIR}")
-    app.run(debug=False, host='0.0.0.0', port=5000, threaded=True)
+    app.run(debug=False, host="0.0.0.0", port=5000, threaded=True)