# Download Progress

This example demonstrates how to download a file from a URL and show its
progress with a [Progress Bubble][progress].

In this case we're getting download progress with an [`io.TeeReader`][tee] and
sending progress `Msg`s to the `Program` with `Program.Send()`.

## How to Run

Build the application with `go build .`, then run with a `--url` argument
specifying the URL of the file to download. For example:

```
./download-progress --url="https://download.blender.org/demo/color_vortex.blend"
```

Note that in this example a TUI will not be shown for URLs that do not respond
with a ContentLength header.

* * *

This example originally came from [this discussion][discussion].

* * *

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[progress]: https://github.com/charmbracelet/bubbles/
[tee]: https://pkg.go.dev/io#TeeReader
[discussion]: https://github.com/charmbracelet/bubbles/discussions/127