HyperPets

Animated pets for Hyper terminal panes.

The first pass includes:

• one or two pets per pane
• idle, wander, sleep, cursor-chase, and toy-chase behavior
• bounded toy spawning with cooldowns
• lightweight per-pane overlay rendering
• external cat sprite assets with state transitions between major behaviors

Install locally during development

1. Put this folder somewhere stable.
2. Add hyperpets to localPlugins in your Hyper config.

module.exports = {
  config: {
    hyperPets: {
      petCount: 1,
      petTypes: ['cat'],
      maxToys: 1,
      toyCooldownMs: 20000,
      successToyChance: 0.35,
      walkSpeed: 0.45,
      animationSpeed: 0.5,
      sleepMinDurationMs: 30000,
      sleepMaxDurationMs: 180000,
      debugFrames: false
    }
  },
  localPlugins: [
    'hyperpets'
  ]
};

On macOS the config file is typically:

~/Library/Application Support/Hyper/.hyper.js

Then reload Hyper with Cmd+R.

Config

hyperPets: {
  enabled: true,
  petCount: 1,
  petTypes: ['cat'],
  maxToys: 1,
  toyCooldownMs: 20000,
  successToyChance: 0.35,
  chaseCursorChance: 0.04,
  walkSpeed: 0.45,
  animationSpeed: 0.5,
  sleepMinDurationMs: 30000,
  sleepMaxDurationMs: 180000,
  debugFrames: false,
  reducedMotion: false,
  onlyActivePane: true
}

Notes

• Command-success toy spawning currently uses a prompt-return heuristic from terminal output, not shell integration.
• The plugin is intentionally conservative so it does not flood panes with toys or constant motion.
• The current animation system uses asset manifests under assets/pets/. cat is currently aliased to the Maple sprite sheet so existing configs keep working.

Asset Pipeline

• Cat frames live in assets/pets/cat/frames/*.svg.
• The cat manifest in assets/pets/cat.js maps clips and transitions to those frame files.
• Maple lives in assets/pets/maple/ and is wired as a sprite-sheet asset through assets/pets/maple.js.
• The renderer supports both individual SVG frames and sprite-sheet cells behind the same clip API.
• To add a new pet type later, create another manifest under assets/pets/ plus a matching frame directory, then register it in assets/pets/index.js.

Sheet Tools

• Split a uniform sheet into per-frame PNGs:

bash scripts/split_sprite_sheet.sh assets/pets/maple/spritesheet.webp 192 208 assets/pets/maple/frames maple

• Stitch a frame directory back into a sheet:

bash scripts/stitch_sprite_sheet.sh assets/pets/maple/frames 8 9 /tmp/maple-sheet.png maple

Debugging

• Set hyperPets.debugFrames to true to show the active clip, frame number, facing direction, sprite-sheet row/column, and a rolling history of the last 5 displayed frames beside each pet.