oco is a replacement for autoindexing your current directory using `python3 -m http.server`. Just run `python3 -m oco` instead.
It renders searchable directory listings and lets you upload new files.
For files that are FLAC, MP3 or WAV there is a special preview page that displays a waveform and a spectrogram. Dragging on a waveform creates an annotation region that will be stored in a separate `.spans` file next to the audio. The preview uses [wavesurfer.js](https://wavesurfer-js.org).
<img width="614" alt="image" src="https://user-images.githubusercontent.com/66214/182046442-8474de6f-a0e1-4f18-a164-d1648867074b.png">