| """ |
| A rudimentary URL downloader (like wget or curl) to demonstrate Rich progress bars. |
| """ |
|
|
| from concurrent.futures import ThreadPoolExecutor |
| from functools import partial |
| import os.path |
| import sys |
| from typing import Iterable |
| from urllib.request import urlopen |
|
|
| from rich.progress import ( |
| BarColumn, |
| DownloadColumn, |
| TextColumn, |
| TransferSpeedColumn, |
| TimeRemainingColumn, |
| Progress, |
| TaskID, |
| ) |
|
|
|
|
| progress = Progress( |
| TextColumn("[bold blue]{task.fields[filename]}", justify="right"), |
| BarColumn(bar_width=None), |
| "[progress.percentage]{task.percentage:>3.1f}%", |
| "•", |
| DownloadColumn(), |
| "•", |
| TransferSpeedColumn(), |
| "•", |
| TimeRemainingColumn(), |
| ) |
|
|
|
|
| def copy_url(task_id: TaskID, url: str, path: str) -> None: |
| """Copy data from a url to a local file.""" |
| response = urlopen(url) |
| |
| progress.update(task_id, total=int(response.info()["Content-length"])) |
| with open(path, "wb") as dest_file: |
| progress.start_task(task_id) |
| for data in iter(partial(response.read, 32768), b""): |
| dest_file.write(data) |
| progress.update(task_id, advance=len(data)) |
|
|
|
|
| def download(urls: Iterable[str], dest_dir: str): |
| """Download multuple files to the given directory.""" |
| with progress: |
| with ThreadPoolExecutor(max_workers=4) as pool: |
| for url in urls: |
| filename = url.split("/")[-1] |
| dest_path = os.path.join(dest_dir, filename) |
| task_id = progress.add_task("download", filename=filename, start=False) |
| pool.submit(copy_url, task_id, url, dest_path) |
|
|
|
|
| if __name__ == "__main__": |
| |
| if sys.argv[1:]: |
| download(sys.argv[1:], "./") |
| else: |
| print("Usage:\n\tpython downloader.py URL1 URL2 URL3 (etc)") |
|
|
