Save single audio file & script when completed in demo app

[Kostis-S-Z]

What's changing

In the demo app, when the script and audio generation of the whole podcast is complete, we want to save the complete audio as a single audio file and the complete script as a text file. This PR is an implementation of two buttons that enable this feature.

Closes #33

How to test it

Steps to test the changes:

1. Install package pip install -e .
2. Run demo app python -m streamlit run demo/app.py
3. Generate a podcast and wait for it to finish
4. Click "Save Podcast to audio file" and verify that a podcast.wav file is generated under the root directory
5. Click "Save Podcast script to text file" and verify that a script.txt file is generated under the root directory

Additional notes for reviewers

Currently the generated podcast text disappears when you click one of the two buttons.

I already...

• Tested the changes in a working environment to ensure they work as expected
• Added some tests for any new functionality
• Updated the documentation (both comments in code and under /docs)

[stefanfrench]

@Kostis-S-Z - looking good. One thing I noticed is that once you click 'save the audio', it removes all the text and audio snippets above. Is there any way we can keep those after the user has clicked save?

[Kostis-S-Z]

@Kostis-S-Z - looking good. One thing I noticed is that once you click 'save the audio', it removes all the text and audio snippets above. Is there any way we can keep those after the user has clicked save?

Well its a bit tricky. Since we are "streaming" the text and the audio as they being generated, its not trivial to make them persistent after clicking a button goes then you need to re-render them. But if you try to do that it will show up like this

If @daavoo has a magic trick to fix this then I am happy to implement it!

[stefanfrench]

@Kostis-S-Z - Okay no worries if its too tricky, its not essential.

[daavoo]

If @daavoo has a magic trick to fix this then I am happy to implement it!

Have you checked https://docs.streamlit.io/develop/concepts/architecture/fragments ?

[Kostis-S-Z]

If @daavoo has a magic trick to fix this then I am happy to implement it!

Have you checked https://docs.streamlit.io/develop/concepts/architecture/fragments ?

I will take a look! Would you be okay if we merge this as is for now, and I work on this later in a different PR? I feel like its a bit lower priority right now

[daavoo]

If @daavoo has a magic trick to fix this then I am happy to implement it!

Have you checked https://docs.streamlit.io/develop/concepts/architecture/fragments ?

I will take a look! Would you be okay if we merge this as is for now, and I work on this later in a different PR? I feel like its a bit lower priority right now

ok, lets consider it a follow-up. I still haven't review the code changes, though