get

#!/bin/python
"""
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(),
    transient=True,
)

def copy_url(task_id: TaskID, url: str, path: str) -> None:
    """Copy data from a url to a local file."""
    response = urlopen(url)
    if response.info()["Content-length"]:
        indeterminate = False
        progress.update(task_id, total=int(response.info()["Content-length"]))
    else:
        indeterminate = True
    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)
            if not indeterminate:
                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__":
    # Try with https://releases.ubuntu.com/20.04/ubuntu-20.04-desktop-amd64.iso
    if sys.argv[1:]:
        download(sys.argv[1:], "./")
    else:
        print("Usage:\n\tget URL1 URL2 URL3 (etc)")