nixpkgs/pkgs/talk/README.md

# talk

ElevenLabs TTS voice notifications with a dismissable desktop popup. Generates speech from text via the ElevenLabs API, plays it through `mpv`, and shows a notification with a **⛔ Abbrechen** button to stop playback.

## Usage

### Argument

```bash
talk "Build abgeschlossen. Alle Tests erfolgreich."
```

### Stdin (pipe)

```bash
echo "Deployment fertig" | talk
nixos-rebuild build 2>&1 | tail -3 | talk
pi -p "Fasse zusammen" | talk
```

## Environment Variables

| Variable | Required | Default | Description |
|---|---|---|---|
| `ELEVENLABS_API_KEY` | ⚠️ | — | Fallback if agenix file is absent |
| `ELEVENLABS_KEY_FILE` | ❌ | `/run/agenix/elevenlabs-key` | Path to agenix secrets file (preferred) |
| `ELEVENLABS_VOICE_ID` | ❌ | `KXxZd16DiBqt82nbarJx` | Voice ID to use |
| `VOICE_NOTIFY` | ❌ | `1` | Set to `0` to silence all output |

The API key is read from the agenix file at `/run/agenix/elevenlabs-key` by default. The file should contain just the key (trailing newline is stripped automatically via `read -r`). If the file doesn't exist, `talk` falls back to the `ELEVENLABS_API_KEY` environment variable.

## How It Works

1. Sends text to ElevenLabs `text-to-speech` API → receives MP3
2. Plays audio via `mpv` (background)
3. Shows `notify-send` popup with **⛔ Abbrechen** action (background)
4. Polls every 0.2s:
   - If mpv finished → kill notification, exit
   - If user clicked **Abbrechen** → kill mpv, exit
5. Cleans up temp files on exit

## Cancel Button

The notification popup has a **⛔ Abbrechen** action button. Clicking it kills `mpv` playback immediately. The popup disappears when audio finishes or is cancelled.

The poll loop uses `[ -s ]` (non-empty file check) on the action output file. This ensures the loop only reacts when `notify-send` actually writes the action key — not when the empty file is created by the shell redirect.

## Integration Patterns

### After long-running tasks

```bash
nixos-rebuild switch 2>&1 | tail -5 | talk
```

### With AI agents (print mode)

```bash
# Pi
pi -p "Review diesen Code" | talk

# OpenCode
opencode run "Erkläre diese Funktion" -q | talk
```

### With crunch (scheduled jobs)

```bash
crunch ai pi daily "08:00" "Fasse Basecamp Todos zusammen"
# → talk speaks the summary at 08:00
```

## NixOS Installation

```nix
# home-manager
home.packages = [ pkgs.m3ta.talk ];
```

The API key is read from `/run/agenix/elevenlabs-key` at runtime — set up the secret in your agenix configuration:

```nix
# secrets.nix
age.secrets."elevenlabs-key" = {
  file = ./secrets/elevenlabs-key.age;
  # Optionally set owner/group if needed
};
```

No need to export `ELEVENLABS_API_KEY` in shell environment anymore.

## Dependencies

- `curl` — API calls
- `python3` — JSON payload construction
- `mpv` — audio playback
- `libnotify` — desktop notification
- `busybox` — coreutils (rm, cat, grep, sleep, kill, stat)