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# pncdsl — reference manual
A point-and-click adventure game framework for Go, built on top of
[Ebitengine](https://ebitengine.org/). Games are composed by registering
plain struct literals into per-entity `*Manager` registries hanging off a
single `*Game` root. The library handles input, rendering, dialog trees,
cutscenes, HUD, themes and lazy asset loading; the domain only declares
content.
This document is the full library reference. The companion `pncdsl-demo`
repo at <ssh://git@git.teletypegames.org:2222/games/pncdsl-demo> is a small
end-to-end example ("Morning Coffee") that consumes this library as a
plain Go module.
**Module path:** `git.teletypegames.org/games/pncdsl`
```go
import "git.teletypegames.org/games/pncdsl"
```
---
## Table of contents
1. [Introduction](#1-introduction)
2. [Quick start](#2-quick-start)
3. [The Manager pattern](#3-the-manager-pattern)
4. [The Game aggregate](#4-the-game-aggregate)
5. [Geometry primitives](#5-geometry-primitives)
6. [Entity reference](#6-entity-reference)
- 6.1 [Asset](#61-asset)
- 6.2 [Scene](#62-scene)
- 6.3 [Hotspot](#63-hotspot)
- 6.4 [Trigger](#64-trigger)
- 6.5 [Item](#65-item)
- 6.6 [Inventory](#66-inventory)
- 6.7 [Character](#67-character)
- 6.8 [Dialogue](#68-dialogue)
- 6.9 [Script](#69-script)
- 6.10 [Verb](#610-verb)
7. [The action system](#7-the-action-system)
- 7.1 [Action and Runner](#71-action-and-runner)
- 7.2 [Status and Ctx](#72-status-and-ctx)
- 7.3 [Built-in actions](#73-built-in-actions)
- 7.4 [Custom actions](#74-custom-actions)
8. [Conditions](#8-conditions)
9. [World state](#9-world-state)
10. [The widget system](#10-the-widget-system)
- 10.1 [Widget interface](#101-widget-interface)
- 10.2 [Z-order and input consumption](#102-z-order-and-input-consumption)
- 10.3 [Built-in widgets](#103-built-in-widgets)
- 10.4 [The clickBlocker contract](#104-the-clickblocker-contract)
- 10.5 [Registration helpers](#105-registration-helpers)
- 10.6 [Custom widgets](#106-custom-widgets)
11. [Themes](#11-themes)
12. [Asset pipeline](#12-asset-pipeline)
13. [Audio](#13-audio)
14. [Input](#14-input)
15. [The game loop](#15-the-game-loop)
16. [Scene transitions](#16-scene-transitions)
17. [Validation](#17-validation)
18. [Save and load](#18-save-and-load)
19. [Errors](#19-errors)
20. [Testing](#20-testing)
21. [Project layout](#21-project-layout)
22. [License](#22-license)
---
## 1. Introduction
`pncdsl` is **not** a generic engine — it is a thin Go-level DSL layer on
top of Ebitengine that implements the fixed skeleton of the point-and-click
adventure genre as it existed in the LucasArts SCUMM era (Maniac Mansion,
Monkey Island, Day of the Tentacle):
- scenes with hotspots and click zones,
- a verb-based interaction grammar (Look, Use, Talk, Take, …),
- inventory, item-on-item and item-on-hotspot combinations,
- dialog trees with conditional choices,
- a scripting / cutscene system built from composable `Action` values,
- a widget-tree HUD that you can extend with anything Ebitengine can draw,
- swappable color themes,
- placeholder graphics so the game runs without any art on disk.
The design collapses to **one organising pattern**: every named entity is
registered via `Manager.Register(Entity{Name: "..."})`. No builders, no
fluent chains, no scattered registries. The same mental model applies to
items, scenes, characters, dialogues, scripts, assets, verbs, widgets and
themes alike.
A complete example game ("Morning Coffee") lives in the separate
[`pncdsl-demo`](ssh://git@git.teletypegames.org:2222/games/pncdsl-demo) repo
and consumes this library as a regular Go module.
---
## 2. Quick start
**Prerequisites.** Go 1.24+ (for generic type aliases) and a working OpenGL
context. Ebitengine handles windowing and the render loop.
**Use the library in your own project:**
```bash
go mod init my-game
go get git.teletypegames.org/games/pncdsl
```
If the private host can't be reached over HTTPS, point Go at the SSH
endpoint:
```bash
git config --global \
url."ssh://git@git.teletypegames.org:2222/".insteadOf "https://git.teletypegames.org/"
export GOPRIVATE=git.teletypegames.org/*
```
**Minimum game:**
```go
package main
import (
"log"
"git.teletypegames.org/games/pncdsl"
)
func main() {
g := pncdsl.NewGame("Sample", 320, 200)
g.AssetManager.Register(pncdsl.Asset{
Name: "bg/room", Path: "assets/bg/room.png", Kind: pncdsl.AssetImage,
})
g.CharacterManager.Register(pncdsl.Character{Name: "player", W: 28, H: 62})
g.SceneManager.Register(pncdsl.Scene{
Name: "room",
Background: "bg/room",
Actors: []pncdsl.SceneActor{{CharacterName: "player", At: pncdsl.Point{X: 160, Y: 140}}},
Hotspots: []pncdsl.Hotspot{{
Name: "door",
Area: pncdsl.Rect(260, 50, 40, 90),
Label: "door",
OnLook: pncdsl.Say("player", "A wooden door."),
}},
})
g.StartAt("room")
pncdsl.RegisterDefaultUI(g) // optional; auto-called by Run if no widgets registered
if err := pncdsl.Run(g); err != nil {
log.Fatal(err)
}
}
```
---
## 3. The Manager pattern
Every name-addressable entity goes through one shared generic type:
```go
// pncdsl/core.manager.go
type Named interface {
GetName() string
}
type Manager[T Named] struct { /* ... */ }
```
Each entity kind has its own alias (generic type alias, Go 1.24+):
```go
type ItemManager = Manager[Item]
type SceneManager = Manager[Scene]
type CharacterManager = Manager[Character]
type DialogueManager = Manager[Dialogue]
type ScriptManager = Manager[Script]
type AssetManager = Manager[Asset]
type VerbManager = Manager[Verb]
type UIManager = Manager[Widget]
type ThemeManager = Manager[Theme]
```
### 3.1 Public API
| Method | Behaviour |
|------------------------|------------------------------------------------------------|
| `Register(v T)` | Adds `v` to the registry. Panics on empty or duplicate `Name`. |
| `Get(name) (T, bool)` | Looks up by name. The boolean is `false` if absent. |
| `MustGet(name) T` | Same as `Get`, but panics on missing names. |
| `Has(name) bool` | True if the name is registered. |
| `Len() int` | Number of registered entries. |
| `Names() []string` | Returns names in **insertion order** (used for widget Z-order). |
| `SortedNames() []string` | Returns names alphabetically. |
| `Each(fn func(T))` | Iterates in insertion order. |
| `Remove(name string)` | Drops a registration; silent no-op if unknown. |
### 3.2 The `Named` contract
Every registerable struct implements `GetName() string`. Most also
implement an optional `TypeLabel() string` that the manager uses in panic
messages for clearer errors:
```go
func (i Item) GetName() string { return i.Name }
func (i Item) TypeLabel() string { return "item" }
```
### 3.3 Why panic on duplicates?
A duplicate registration is a construction-time bug — code that ran once
on startup. Crashing loudly during `Build()` surfaces the problem in
development; quietly accepting the second registration would silently mask
shadowed entities at runtime.
---
## 4. The Game aggregate
```go
// pncdsl/core.game.go
type Game struct {
Title string
Width, Height int
// entity managers
ItemManager *ItemManager
SceneManager *SceneManager
CharacterManager *CharacterManager
DialogueManager *DialogueManager
ScriptManager *ScriptManager
AssetManager *AssetManager
VerbManager *VerbManager
UIManager *UIManager
ThemeManager *ThemeManager
// runtime services
State *State
Inventory *Inventory
Audio *AudioPlayer
Camera *Camera
Input *Input
// log buffer
MaxLogLines int
/* unexported runtime fields */
}
```
### 4.1 Construction
```go
func NewGame(title string, w, h int) *Game
```
Initialises every manager (empty), registers the default SCUMM verb set
(`look`, `use`, `talk`, `take`), installs all four preset themes, and
selects `classic-scumm` as the active theme. Widgets are **not**
auto-registered — call `RegisterDefaultUI(g)` (or one of its siblings)
explicitly, or let `Run` install the default set if `UIManager` is empty.
### 4.2 Lifecycle hooks
```go
func (g *Game) StartAt(name string) *Game // entry scene
func (g *Game) OnStart(a Action) *Game // action run after the scene's OnEnter
func (g *Game) Validate() error // cross-check name references
func (g *Game) Run() error // same as pncdsl.Run(g)
```
`StartAt` and `OnStart` return `*Game` so they chain at the end of `Build`.
### 4.3 Theme accessors
```go
func (g *Game) Theme() Theme // active theme value
func (g *Game) UseTheme(name string) // switch theme (runtime ok)
```
The active theme is addressed by name, not by pointer — switching is just
`g.UseTheme("paper-notebook")` and the next frame uses the new colors.
### 4.4 UI runtime helpers
The current `selectedVerb`, `hoverLabel`, speech and flash message live on
`Game`. They are written by actions / the engine, read by widgets:
```go
func (g *Game) SelectedVerb() string
func (g *Game) SetSelectedVerb(s string)
func (g *Game) HoverLabel() string // raw target label
func (g *Game) SetHoverLabel(s string)
func (g *Game) HoverHint() string // composed "verb + target"
func (g *Game) SetSpeech(speaker, text string)
func (g *Game) ClearSpeech()
func (g *Game) FlashLine(text string) // ~2s status banner
```
### 4.5 Chat-log API
The engine and the `Say` action push entries here; the `ChatLog` widget
reads them. Set `Game.MaxLogLines` to bound the ring buffer (0 = unbounded).
```go
type LogKind int
const (
LogAction // "> look at door" lines (player commands)
LogResponse // in-world replies / Say output
LogSystem // game/system meta
)
type LogMessage struct {
Speaker string
Text string
Kind LogKind
}
func (g *Game) LogAction(text string)
func (g *Game) LogResponse(speaker, text string)
func (g *Game) LogSystem(text string)
func (g *Game) Messages() []LogMessage
```
### 4.6 Scene helpers
```go
func (g *Game) CharacterInScene(name string) bool
```
Used by `CharacterPanel` to auto-hide when its character isn't an actor in
the current scene.
### 4.7 Text drawing hook
```go
func (g *Game) DrawText(dst *ebiten.Image, s string, x, y int, c color.Color)
```
Single indirection so widgets can hand a `color.Color` today and the
library can swap to `text/v2` later without changing call sites.
---
## 5. Geometry primitives
```go
// pncdsl/util.geometry.go
type Point struct{ X, Y float64 }
func (p Point) Add(q Point) Point
func (p Point) Sub(q Point) Point
func (p Point) Dist(q Point) float64
type Shape interface {
Contains(p Point) bool
Bounds() Rectangle
}
type Rectangle struct{ X, Y, W, H float64 }
func Rect(x, y, w, h float64) Rectangle
func (r Rectangle) Contains(p Point) bool
func (r Rectangle) Bounds() Rectangle
func (r Rectangle) Center() Point
type Polygon struct{ Points []Point }
func Poly(pts ...Point) Polygon
func (g Polygon) Contains(pt Point) bool // ray-casting
func (g Polygon) Bounds() Rectangle // axis-aligned bbox
```
Both `Rectangle` and `Polygon` satisfy `Shape` and can be used as a
`Hotspot.Area`. Internally, hotspots are hit-tested against `Shape.Contains`
each frame.
---
## 6. Entity reference
### 6.1 Asset
```go
// pncdsl/asset.def.go
type AssetKind int
const (
AssetImage AssetKind = iota
AssetAudio
AssetFont
)
type Asset struct {
Name string // logical id used everywhere ("bg/kitchen")
Path string // disk path ("assets/bg/kitchen.png")
Kind AssetKind
}
```
Assets are **lazy**: `Register` only stores the spec. The file is opened on
the first `loadedAssets.image(...)` request. Missing files fall back to a
deterministic colored placeholder so the game runs without any art —
useful for prototyping or CI.
```go
g.AssetManager.Register(pncdsl.Asset{
Name: "bg/kitchen",
Path: "assets/bg/kitchen.png",
Kind: pncdsl.AssetImage,
})
```
### 6.2 Scene
```go
// pncdsl/scene.def.go
type Scene struct {
Name string
Title string // optional human-readable name (TopBar widget reads this)
Background string // Asset.Name
Music string // Asset.Name (optional)
Hotspots []Hotspot
Walkboxes []Polygon
Triggers []Trigger
Actors []SceneActor
OnEnter Action
OnLeave Action
}
type SceneActor struct {
CharacterName string
At Point
}
```
`OnEnter` is queued the moment the scene becomes current (after a fade-in);
`OnLeave` runs on the transition out. `Actors` lists which registered
characters are placed in the scene and where their feet start.
`Walkboxes` constrain character movement. When non-empty, `Walk(...)`
routes through a BFS over the polygon adjacency graph (polygons that
share an edge are neighbours), with the midpoint of each shared edge
used as a waypoint. Destinations outside every walkbox are clipped to
the nearest boundary. With no walkboxes the character walks in a
straight line — see [§6.7](#67-character) and [§15.4](#154-character-movement).
`Triggers` fire on the rising edge of their `When` condition. The
engine samples each trigger once per idle frame; see [§6.4](#64-trigger).
### 6.3 Hotspot
```go
// pncdsl/scene.hotspot.go
type Hotspot struct {
Name string
Area Shape // Rectangle or Polygon
Label string // hover hint
Cursor CursorKind
// built-in verb handlers
OnLook Action
OnUse Action
OnTalk Action
OnTake Action
OnGive Action
// when the player has an item selected and clicks this hotspot,
// the engine looks up the item's Name here first.
OnUseWith map[string]Action
// custom verbs registered through g.VerbManager.
OnVerb map[string]Action
}
type CursorKind int
const (
CursorDefault CursorKind = iota
CursorLook
CursorUse
CursorTalk
CursorTake
CursorExit
)
```
Hotspots are children of `Scene` — not their own manager. The engine
resolves a click via `hotspot.handler(verbName)` which maps the four
built-in verbs to their `On*` fields and falls back to `OnVerb[verbName]`
for custom verbs.
### 6.4 Trigger
```go
// pncdsl/scene.trigger.go
type Trigger struct {
Name string
When Condition
Do Action
Once bool
}
```
Triggers arm when the scene is entered. Every idle frame (when the
script slot is free), the engine samples each trigger's `When`
condition; on a **rising edge** (false → true) it queues `Do` into the
script slot. `Once: true` makes the trigger fire at most once per
arming. A trigger with `nil` `When` or `nil` `Do` is silently skipped.
Triggers are not sampled while a cutscene or dialog is running, so a
condition that becomes true mid-script is detected on the next idle
frame — the edge is preserved across the busy window. Save/Load resets
trigger state to "freshly armed", matching the behaviour of scene
re-entry.
### 6.5 Item
```go
// pncdsl/item.def.go
type Item struct {
Name string
Sprite string // Asset.Name
Description string
OnUseSelf Action
// targetName → action. Target can be a hotspot Name or another item Name.
OnUseWith map[string]Action
}
```
Items live in the `ItemManager`. When the player picks one up
(`Give("key")`) the item is appended to the `Inventory`. Clicking a
hotspot with an item selected resolves the action via, in order:
1. `hotspot.OnUseWith[item.Name]`
2. `item.OnUseWith[hotspot.Name]`
3. Otherwise the engine flashes "Nem ehhez." and deselects.
### 6.6 Inventory
```go
// pncdsl/item.inventory.go
type Inventory struct{ /* unexported */ }
func NewInventory() *Inventory
func (i *Inventory) Add(name string)
func (i *Inventory) Remove(name string)
func (i *Inventory) Has(name string) bool
func (i *Inventory) Select(name string) // "" clears
func (i *Inventory) Selected() string
func (i *Inventory) Items() []string // copy
```
Not a manager — pure runtime state owned by `Game`. Mutated by actions
(`Give`, `TakeAway`) and by the `InventoryBar` widget on click.
### 6.7 Character
```go
// pncdsl/actor.def.go
type Character struct {
Name string
Sprite string // Asset.Name (placeholder if missing)
Animations map[string]AnimationClip
Speed float64
SpeechColor color.Color
Start Point
W, H float64 // size hint for placeholder
}
type AnimationClip struct {
Frames []Rectangle
FrameTime float64
Loop bool
}
```
When no real sprite is on disk, `drawCharacter` falls back to a stylised
placeholder: humanoid if `W < H`, quadruped otherwise. `SpeechColor` (if
an `RGBA`) colours both the speech-bubble text and the placeholder body.
`Animations` maps a clip name to an `AnimationClip`. The engine
auto-selects clips by name: `"walk"` while the character has an active
path, `"idle"` otherwise. If only one of the two is registered, it
plays in both states. `FrameTime ≤ 0` or `Frames` empty disables the
clip; missing clips fall back to the whole-sprite (or placeholder) draw.
Each `Frames` entry is a source rectangle into the character's `Sprite`
image, blitted via `SubImage` and scaled to the character's `W×H`
footprint. `Loop: true` rewinds to frame 0 after the last frame;
`Loop: false` freezes on the final frame.
Movement is driven by the `Walk` action and `Game.tickCharacters` —
stepping at `Speed` pixels/sec (default 60) along the waypoint list
computed by [walkbox routing](#62-scene).
### 6.8 Dialogue
```go
// pncdsl/dialog.def.go
type Dialogue struct {
Name string
Start string // initial node Name; "" = first in slice
Nodes []DialogueNode
}
type DialogueNode struct {
Name string
Lines []DialogueLine // shown one-at-a-time on click
Choices []DialogueChoice
}
type DialogueLine struct {
Speaker string // Character.Name
Text string
}
type DialogueChoice struct {
Text string
Show Condition // nil = always visible
Once bool // hide after first pick
Actions []Action // run when chosen
}
func (d Dialogue) Node(name string) (DialogueNode, bool)
```
The dialog flow:
1. `RunDialogue("name")` action starts the dialogue; the runner keeps
returning `StatusRunning` until the dialog closes.
2. The `DialogBox` widget renders lines one at a time; click advances.
3. After the last line, visible `Choices` are shown.
4. Picking a choice runs `Seq(choice.Actions...)`. `Once` choices remember
that they fired via `State.NoteTalked`.
5. `EndDialogue()` closes the conversation; `GotoNode("other")` jumps to
another node in the same dialogue.
### 6.9 Script
```go
// pncdsl/action.script.go
type Script struct {
Name string
Actions Action // typically Seq(...)
}
```
A `Script` is just a named composite action — useful when you want to
reuse a cutscene (intro, victory, transition) from multiple call sites.
Fire one with `RunScript("name")`.
### 6.10 Verb
```go
// pncdsl/ui.verb.go
type Verb struct {
Name string // canonical id, e.g. "look"
Label string // display label, e.g. "Nézd"
Default Action // run when a hotspot has no handler
}
```
`NewGame` pre-registers the four SCUMM verbs (`look`, `use`, `talk`,
`take`). Add your own:
```go
g.VerbManager.Register(pncdsl.Verb{
Name: "push", Label: "Lökd",
Default: pncdsl.Say("player", "Nem mozdul."),
})
```
The verb-bar and verb-wheel widgets read `VerbManager.Names()` every
frame, so adding a verb at runtime is enough to make it appear.
---
## 7. The action system
### 7.1 Action and Runner
```go
// pncdsl/action.def.go
type Action interface {
Start() Runner
}
type Runner interface {
Tick(ctx *Ctx) Status
}
```
An `Action` is an **immutable spec** of work — safe to store in a
`Hotspot.OnLook` field and use across many clicks. A `Runner` is one
in-flight execution, created by `Start()`, carrying state (elapsed time,
sub-runners, started-flag). The engine never ticks an `Action` directly;
it always asks for a fresh `Runner` per invocation.
Only one runner is active at a time (the "script slot"). New action
queues issued while one is running are dropped (logged at debug level).
A multi-actor scene can still run parallel work via `Par(...)` inside a
single composite action.
### 7.2 Status and Ctx
```go
type Status int
const (
StatusRunning Status = iota
StatusDone
StatusFailed
)
type Ctx struct {
Game *Game
DT float64 // seconds since last tick
Scene *Scene // current scene (may be nil)
Hotspot *Hotspot // populated only for action contexts where applicable
Item *Item
}
```
`Status` controls how the parent runner reacts: `StatusDone` advances a
`Seq` to the next step, `StatusFailed` short-circuits the whole branch
(`RequireItem` uses this to abort a sequence when the item is absent).
### 7.3 Built-in actions
| Constructor | Behaviour |
|------------------------------------------|---------------------------------------------------------------------------|
| `Seq(a ...Action) Action` | Run children in order. Nested `Seq` are flattened. `nil` children are ignored. |
| `Par(a ...Action) Action` | Run children simultaneously; completes when every child reports `Done`. |
| `If(c Condition, then Action, els ...Action) Action` | Run `then` if `c` evaluates true; otherwise `Seq(els...)` (if any).|
| `Wait(seconds float64) Action` | Block the runner for `seconds`. |
| `Say(speaker, text string) Action` | Show the line above the speaker (`SpeechBubble`), append to chat-log. Click-to-skip. Duration scales with text length, 1.2s floor. |
| `GoTo(scene string) Action` | Switch the current scene via a fade transition. |
| `Walk(character string, to Point) Action`| Move a character to `to` at `Character.Speed`. Returns when arrived. |
| `Give(item string) Action` | Add `item` to inventory. |
| `TakeAway(item string) Action` | Remove `item` from inventory. |
| `RequireItem(item string) Action` | If the item is not in inventory, flash "Ehhez kell egy …" and fail. |
| `SetFlag(name string) Action` | `State.SetFlag(name)`. |
| `ClearFlag(name string) Action` | `State.ClearFlag(name)`. |
| `SetVar(name string, v any) Action` | `State.SetVar(name, v)`. |
| `PlayMusic(asset string) Action` | Hand off to `AudioPlayer.PlayMusic`. (Currently logged only.) |
| `StopMusic() Action` | `AudioPlayer.StopMusic`. |
| `PlaySound(asset string) Action` | `AudioPlayer.PlaySound`. |
| `RunDialogue(name string) Action` | Start a registered `Dialogue`; runner blocks until the dialog closes. |
| `EndDialogue() Action` | Close the active dialog. |
| `GotoNode(node string) Action` | Jump to a node within the active dialog. |
| `RunScript(name string) Action` | Run a registered `Script`'s `Actions`. |
| `ShowEnd(text string) Action` | Display the end-card overlay; runner never finishes. |
| `Custom(fn func(*Ctx) Status) Action` | Escape hatch — wrap an arbitrary callback as an action. |
### 7.4 Custom actions
Implement `Action` and `Runner` directly when you need long-running state
(an animation, a tween, an HTTP poll):
```go
type fadeAction struct{ target string; duration float64 }
func (a *fadeAction) Start() Runner { return &fadeRunner{spec: a} }
type fadeRunner struct {
spec *fadeAction
elapsed float64
}
func (r *fadeRunner) Tick(ctx *Ctx) Status {
r.elapsed += ctx.DT
if r.elapsed >= r.spec.duration {
return StatusDone
}
// mutate state, draw a fade, etc.
return StatusRunning
}
```
For one-shot mutations, `Custom` is shorter:
```go
bumpScore := pncdsl.Custom(func(ctx *pncdsl.Ctx) pncdsl.Status {
cur := ctx.Game.State.Var("score").(int)
ctx.Game.State.SetVar("score", cur+10)
return pncdsl.StatusDone
})
```
---
## 8. Conditions
```go
// pncdsl/action.condition.go
type Condition interface {
Eval(ctx *Ctx) bool
}
```
| Constructor | Meaning |
|----------------------------------------|--------------------------------------------------|
| `Not(c Condition) Condition` | `!c` |
| `And(cs ...Condition) Condition` | All must evaluate true. |
| `Or(cs ...Condition) Condition` | At least one true. |
| `Flag(name string) Condition` | `State.Flag(name)` |
| `HasItem(name string) Condition` | `Inventory.Has(name)` |
| `SelectedItem(name string) Condition` | `Inventory.Selected() == name` |
| `InScene(name string) Condition` | The current `Ctx.Scene` matches. |
| `VarEq(name string, v any) Condition` | `State.Var(name) == v` (Go equality). |
Conditions are stateless — they are evaluated lazily, including inside
`If` and `DialogueChoice.Show`.
---
## 9. World state
```go
// pncdsl/state.def.go
type State struct{ /* unexported */ }
func NewState() *State
func (s *State) Flag(name string) bool
func (s *State) SetFlag(name string)
func (s *State) ClearFlag(name string)
func (s *State) Var(name string) any
func (s *State) SetVar(name string, v any)
func (s *State) Visited(name string) int
func (s *State) NoteVisit(name string) // engine bumps on scene enter
func (s *State) Talked(node string) int
func (s *State) NoteTalked(node string) // DialogBox bumps on Once-choice pick
```
`Flag`/`SetFlag` are the workhorse for puzzle state ("cupboard_open").
`SetVar` accepts any value — strings for text, numbers for scores, struct
references for richer dashboards. The `TopBar` widget reads vars by name
to render score / time.
`Visited` and `Talked` underpin the "Once" semantics in dialogues and
could be used by triggers once those land.
---
## 10. The widget system
The HUD is a tree of `Widget`s, each registered into `g.UIManager`. The
library ships built-in widgets for every classic adventure UI piece;
domain code can register arbitrary new ones — chat panels, minimaps,
hotbars — without touching the library.
### 10.1 Widget interface
```go
// pncdsl/ui.widget.go
type Widget interface {
Named
Tick(ctx *UICtx)
Draw(dst *ebiten.Image, ctx *UICtx)
}
type UICtx struct {
Game *Game
DT float64
}
type MouseButton int
const (
MouseButtonLeft MouseButton = iota
MouseButtonRight
)
type Size struct{ W, H int }
type Align int
const (
AlignLeft Align = iota
AlignCenter
AlignRight
)
```
A widget is responsible for its own input handling, hit-testing, state
and rendering. The library does not impose a layout layer — widgets carry
their own `Bounds` (or compute them dynamically, like `RadialVerbs`).
### 10.2 Z-order and input consumption
- **`Tick` runs in reverse registration order.** Widgets registered later
(drawn on top) get the click first. Each widget calls
`ctx.Game.Input.ConsumeLeft()` / `ConsumeRight()` to claim the event;
later widgets see `LeftClicked() == false`.
- **`Draw` runs in registration order** — registered last → painted on top.
- The `Cursor` widget is registered last by convention so it always wins
on visual layer (and effectively never claims clicks).
After all widgets ticked, the engine offers the (possibly consumed) click
to `handleSceneInput`, which is where hotspot interactions live. If a
widget already consumed the click, `handleSceneInput` becomes a no-op for
that frame.
### 10.3 Built-in widgets
Each widget lives in its own `pncdsl/ui.<name>.go` file. Fields with a
zero value fall back to a sensible default.
#### `Panel` (`ui.panel.go`)
A generic colored rectangle, optionally with a stroke border. Useful as a
backdrop for grouping other widgets.
```go
type Panel struct {
Name string
Bounds Rectangle
BG color.Color // nil → Theme.PanelBG
Border int // 0 = no border
BorderColor color.Color // nil → Theme.DialogBorder
}
```
#### `StatusLine` (`ui.status.go`)
A single line at `Y`. Shows the active flash message (if any) — set by
`Game.FlashLine` — otherwise the composed hover hint (`verb + target` or
`verb + item + target`).
```go
type StatusLine struct {
Name string
Y int
Align Align // default AlignCenter
ScreenWidth int // 0 → Game.Width
}
```
#### `VerbBar` (`ui.verb_bar.go`)
The SCUMM permanent verb panel. Reads `VerbManager.Names()` every frame
and lays the labels into a `Cols × ceil(N/Cols)` grid.
```go
type VerbBar struct {
Name string
Origin Point
Cols int // default 2
Button Size
Gap Point
PanelBG bool // draw a Theme.PanelBG backdrop behind buttons
}
```
Click on a button → `Game.SetSelectedVerb(name)`. Implements
`BlocksClickAt` so `RadialVerbs` does not pop up over it.
#### `RadialVerbs` (`ui.verb_radial.go`)
Verb-coin or permanent verb-wheel.
```go
type RadialVerbs struct {
Name string
Trigger MouseButton // default MouseButtonRight
Radius float64 // default 40
// AlwaysVisible turns the widget into a permanent wheel at Center.
// Trigger is ignored in this mode; left-click picks a slice.
AlwaysVisible bool
Center Point
// Override the rendered label per verb name (e.g. shorten "Használd"
// → "Tedd" so it fits inside the disk).
Labels map[string]string
}
```
In **trigger mode** (default), the wheel is invisible until the trigger
mouse button is pressed somewhere not covered by a `clickBlocker`. The
center latches to the click point. Left-click on a slice picks the verb;
trigger-click again closes without picking.
In **always-visible mode**, the wheel is drawn permanently at `Center`
and left-click on a slice picks the verb. Labels are positioned at
`0.62 × Radius` from the center so short overrides stay inside the rim.
#### `InventoryBar` (`ui.inventory.go`)
Item slots in a grid. Hover sets `Game.SetHoverLabel(item.Description)`;
click toggles selection (or, under the `look` verb, runs a `Say` with
the item description).
```go
type InventoryBar struct {
Name string
Origin Point
Slots int // total slot count
Cols int // 0 → Slots (single row)
SlotSize int
Gap int
PanelBG bool
}
```
Implements `BlocksClickAt` covering the slot grid.
#### `SpeechBubble` (`ui.speech.go`)
Renders whatever `Game.SetSpeech(...)` last set, positioned above the
speaker's head (`character.pos.Y − character.def.H − OffsetY`). Falls back
to a screen-top position if the speaker is unknown.
```go
type SpeechBubble struct {
Name string
MaxWidth int // wrap width, default 200
Padding int // bubble padding, default 3
OffsetY int // vertical lift above head
FallbackY int // anchor Y when speaker unknown
}
```
Text color follows `Character.SpeechColor` when set, otherwise
`Theme.SpeechDefaultText`.
#### `DialogBox` (`ui.dialog_box.go`)
Dormant unless `Game.dialogueActive()`. While active, **consumes every
click** — the rest of the HUD and the scene are inert. The widget renders
either the current line of `runtimeDialog.Node.Lines` (click → next line)
or the visible `Choices` once the lines are exhausted.
```go
type DialogBox struct {
Name string
Bounds Rectangle // default Rect(0, 140, Width, 60)
LineHeight int // default 14
Padding int // default 6
}
```
Hovered choices use `Theme.DialogChoiceHover`. Once-only choices are
omitted automatically after their first pick (tracked by
`State.NoteTalked`).
#### `EndCard` (`ui.end_card.go`)
A fullscreen overlay shown when `Game.showEndCard(text)` is called (which
the `ShowEnd` action does). Consumes every click so nothing underneath
reacts.
```go
type EndCard struct{ Name string }
```
#### `Cursor` (`ui.cursor.go`)
The crosshair cursor (color from `Theme.CursorColor`). When the inventory
has a selected item with a non-placeholder sprite, that sprite is drawn
at the cursor position instead.
```go
type Cursor struct{ Name string }
```
#### `HotspotDebug` (`ui.hotspot_debug.go`)
Stroke-outlines every hotspot in the current scene. F1 toggles it at
runtime (override via `ToggleKey`).
```go
type HotspotDebug struct {
Name string
Enabled bool
ToggleKey ebiten.Key // 0 → ebiten.KeyF1
}
```
#### `TopBar` (`ui.top_bar.go`)
A horizontal strip across the top with three sections:
- **Left:** `LeftText` override or `Scene.Title` (falling back to `Name`).
- **Center:** score string built from `State.Var(ScoreVar)`. With
`ScoreMax > 0`, formatted as `"Score: X/MAX"`, else `"Score: X"`.
- **Right:** time string from `State.Var(TimeVar)`.
```go
type TopBar struct {
Name string
Height int // default 12
LeftText string // overrides scene title
ScoreVar string // State.Var key; "" = no score
ScoreMax int
TimeVar string // State.Var key; "" = no time
}
```
Empty fields are skipped, so the widget gracefully degrades to two- or
one-section layouts.
#### `CharacterPanel` (`ui.character_panel.go`)
A floating info card showing one character's portrait, role badge and
custom stat rows. **Auto-hides** when the character isn't an actor in the
current scene — same registration works across all scenes.
```go
type CharStat struct {
Label string
VarKey string // State.Var(VarKey) is fmt-printed
}
type CharacterPanel struct {
Name string
Bounds Rectangle
Character string // Character.Name
Title string // role badge ("PLAYER", "NPC", "GUIDE", …)
Stats []CharStat
}
```
The portrait reuses the placeholder rendering when no sprite is on disk
(humanoid vs. quadruped picked from `W` vs. `H`).
#### `ChatLog` (`ui.chat_log.go`)
Renders the `Game.Messages()` ring buffer with per-kind colors —
`LogAction` lines use `Theme.ChatLogPrompt`, `LogResponse` uses
`Theme.ChatLogResponse`, `LogSystem` uses `Theme.ChatLogSystem`. Newest
message at the bottom; older messages scroll out of view as the buffer
fills.
```go
type ChatLog struct {
Name string
Bounds Rectangle
LineHeight int // default 10
Padding int // default 3
ShowBorder bool // draws a 1px border in CharacterPanelBorder
}
```
Set `Game.MaxLogLines` to bound the buffer (recommended ~64 for a small
ChatLog).
### 10.4 The `clickBlocker` contract
Some widgets occupy a fixed area; clicking inside should not pop a
`RadialVerbs` menu over them. They implement the optional library-internal
interface:
```go
type clickBlocker interface {
BlocksClickAt(p Point) bool
}
```
Built-ins that implement it: `VerbBar`, `InventoryBar`, `DialogBox`,
`TopBar`, `CharacterPanel`, `ChatLog`, `RadialVerbs` (itself, when
visible). Implement it on your own widgets to mark them as solid input
zones for the radial menu.
### 10.5 Registration helpers
```go
// pncdsl/ui.defaults.go
func RegisterDefaultUI(g *Game) // SCUMM-style verb bar + inventory
func RegisterRadialVerbUI(g *Game) // verb-coin (right-click) + wider inventory
func RegisterRichUI(g *Game, playerName, npcName string) // top bar + character panels + chat log + verb wheel
```
Pass `""` for any character name to skip its `CharacterPanel`. All three
helpers register in conventional Z-order (debug overlay back, cursor
front).
### 10.6 Custom widgets
Anything implementing `Widget` plugs in. The library doesn't care about
widget identity beyond the name; it just calls `Tick` and `Draw`. Read
state from `ctx.Game`, consume input via `ctx.Game.Input`, draw with
Ebitengine primitives, and you're done.
```go
type Minimap struct {
Name string
Bounds pncdsl.Rectangle
}
func (m *Minimap) GetName() string { return m.Name }
func (m *Minimap) Tick(ctx *pncdsl.UICtx) {}
func (m *Minimap) Draw(dst *ebiten.Image, ctx *pncdsl.UICtx) {
// ... render scene thumbnail, mark NPCs, etc.
}
g.UIManager.Register(&Minimap{
Name: "minimap",
Bounds: pncdsl.Rect(220, 4, 96, 56),
})
```
---
## 11. Themes
```go
// pncdsl/ui.theme.go
type Theme struct {
Name string
// panel + status
PanelBG color.Color
StatusText color.Color
FlashText color.Color
// verbs
VerbButtonBG color.Color
VerbButtonSelectedBG color.Color
VerbButtonText color.Color
// inventory
InventorySlotBG color.Color
InventorySlotSelectedBG color.Color
// speech
SpeechBubbleBG color.Color
SpeechDefaultText color.Color
// dialog
DialogBG color.Color
DialogBorder color.Color
DialogChoiceBG color.Color
DialogChoiceHover color.Color
DialogSpeaker color.Color
DialogText color.Color
// misc overlays
EndCardBG color.Color
EndCardText color.Color
CursorColor color.Color
HotspotOutline color.Color
SceneBackdrop color.Color
// rich-UI widgets
TopBarBG color.Color
TopBarText color.Color
TopBarAccent color.Color
ChatLogBG color.Color
ChatLogPrompt color.Color
ChatLogResponse color.Color
ChatLogSystem color.Color
CharacterPanelBG color.Color
CharacterPanelBorder color.Color
CharacterPanelTitle color.Color
}
```
### 11.1 Preset themes
`NewGame` automatically calls `RegisterPresetThemes(g)` and
`UseTheme("classic-scumm")`. The four shipped presets:
| Name | Mood |
|-------------------|-------------------------------------------------------------|
| `classic-scumm` | Default SCUMM-era dark blue + warm amber accents. |
| `sierra-coin` | Darker purple + orange; designed for the verb-coin layout. |
| `paper-notebook` | Cream paper + ink + a touch of sepia for the highlights. |
| `terminal-green` | Retro phosphor green on black. |
### 11.2 Custom themes
Register your own:
```go
g.ThemeManager.Register(pncdsl.Theme{
Name: "midnight-noir",
PanelBG: color.RGBA{6, 6, 12, 255},
StatusText: color.White,
// ... ~30 color fields ...
})
g.UseTheme("midnight-noir")
```
Switching at runtime is just `g.UseTheme(name)` — widgets read the active
theme every frame, so the change shows up on the next draw.
---
## 12. Asset pipeline
`AssetManager.Register` only stores the spec (`Name`, `Path`, `Kind`). The
first request for an image goes through `loadedAssets.image(name)`:
1. Look up the file from `Asset.Path`.
2. If the file is missing or unreadable, generate a deterministic
placeholder color from `fnv32a(name)`. Mark the entry as a placeholder.
3. Cache the decoded `*ebiten.Image` for subsequent calls.
```go
// internal:
type loadedAssets struct {
images map[string]*ebiten.Image
placeholders map[string]bool
}
func (la *loadedAssets) image(am *AssetManager, name string) *ebiten.Image
func (la *loadedAssets) isPlaceholder(name string) bool
```
`isPlaceholder` is used by widgets to decide whether to render a stylised
character placeholder (humanoid / quadruped) or the real sprite.
Supported image formats: PNG and JPEG (registered via blank imports in
`asset.manager.go`). Audio assets (`AssetAudio`) are decoded on demand
by `AudioPlayer` — see [§13](#13-audio). Fonts (`AssetFont`) share the
same registry but are not loaded by the library at this milestone.
---
## 13. Audio
```go
// pncdsl/asset.audio.go
type AudioPlayer struct{ /* unexported */ }
func NewAudioPlayer() *AudioPlayer
func (a *AudioPlayer) PlayMusic(name string)
func (a *AudioPlayer) StopMusic()
func (a *AudioPlayer) PlaySound(name string)
```
Backed by Ebiten's `audio` package. The shared `*audio.Context` is
created lazily on the first `PlayMusic` / `PlaySound`, at a sample rate
of 48 kHz; existing audio contexts (e.g. created by a host process) are
detected via `audio.CurrentContext` and reused. The `Asset.Kind` must
be `AssetAudio` for the player to consider it.
- **Music** streams from disk and loops infinitely. `PlayMusic(name)`
on the currently-playing track no-ops, so it's safe to call from a
scene's `OnEnter` on every visit.
- **Sound effects** are decoded once, cached as raw PCM, and replayed
via `NewPlayerFromBytes` for near-zero-latency triggering. Finished
players are pruned on the next `PlaySound` call.
Supported formats: **WAV** (`.wav`), **OGG Vorbis** (`.ogg`), and
**MP3** (`.mp3`), picked by file extension. Anything else fails to
decode and the asset is flagged so subsequent plays no-op.
Failure modes (missing file, unsupported codec, no audio device) all
degrade to a debug-log line; the game keeps running with no sound. The
`PlayMusic` / `PlaySound` / `StopMusic` actions route through the same
methods, so a domain authored against the original stub still works.
---
## 14. Input
```go
// pncdsl/input.def.go
type Input struct{ /* unexported */ }
func (i *Input) Pos() (int, int)
func (i *Input) Point() Point
func (i *Input) LeftClicked() bool // just-pressed AND not consumed
func (i *Input) RightClicked() bool
func (i *Input) ConsumeLeft()
func (i *Input) ConsumeRight()
```
The engine `poll`s once per frame, snapshotting cursor position and the
just-pressed state for both buttons. Widgets and the engine use the
**consume-on-use** pattern: one click is authoritative — whoever consumes
first wins, later checks see `LeftClicked() == false`.
`Game.Input` is exposed so widgets and custom actions can read it
directly.
---
## 15. The game loop
```go
// pncdsl/core.dsl.go
func Run(g *Game) error // toplevel — same as g.Run()
```
`Run` does, in order:
1. `g.Validate()` — cross-check name references between managers.
2. If `UIManager` is empty, call `RegisterDefaultUI(g)`.
3. Place the start scene directly (no transition), bump
`State.NoteVisit`, position registered actors, kick off music.
4. Compose `Seq(scene.OnEnter, game.OnStart)` and queue it as the initial
action — the first script tick runs both in order.
5. `ebiten.SetWindowSize(Width*4, Height*4)`,
`ebiten.SetWindowTitle(g.Title)`, then `ebiten.RunGame(&engine{g})`.
### 15.1 `engine.Update`
```
poll input
update transition
if transition fading out → return
if scriptRunner != nil:
tick the runner
tick characters
return
clear hoverLabel
for w in reversed(UIManager):
w.Tick(uictx) // widgets consume input top-down
handleSceneInput() // hotspot resolution + right-click reset
tick characters
```
### 15.2 `engine.Draw`
```
fill Theme.SceneBackdrop (if any)
draw scene background image
for c in characters sorted by Y:
drawCharacter(c)
for w in UIManager (registration order):
w.Draw(screen, uictx)
draw transition overlay
```
### 15.3 `handleSceneInput`
Runs only after every widget had a chance. The flow:
1. Set hover label from the hotspot under the cursor (if any).
2. On right-click: deselect the held item if any, otherwise reset
`selectedVerb` to `"look"`.
3. On left-click:
- If an item is selected, try `hotspot.OnUseWith[item]`, then
`item.OnUseWith[hotspot]`. Fail with a "Nem ehhez." flash.
- Otherwise look up `hotspot.handler(selectedVerb)`. Fall back to the
verb's `Default` action. Fail with "Semmi említésre méltó."
4. On every successful click, push a `LogAction` line so the `ChatLog`
widget can display it.
### 15.4 Character movement
`Game.tickCharacters` runs every frame. For each moving character it
steps the head of its waypoint queue at `def.Speed` pixels per second
(default 60); on arrival, the waypoint is popped and the character
proceeds to the next one. The character becomes idle when the queue
empties.
The waypoint queue is built when `Walk(name, to)` runs — see
[§6.2](#62-scene) and [`scene.path.go`](#21-project-layout) for the
walkbox routing. The `Walk` runner returns `StatusRunning` until
`characterMoving(name)` reports false.
Each frame also advances the character's animation clock via
`tickAnimation`, which auto-selects `"walk"` (when `moving == true`)
or `"idle"` from `Character.Animations`. The renderer uses the active
clip's source rectangle to blit a sprite-sheet frame, or falls back to
the whole-sprite / placeholder draw when no clip applies.
---
## 16. Scene transitions
```go
// pncdsl/scene.transition.go (unexported)
type transition struct{ /* unexported */ }
```
A scene change calls `Game.changeScene(name)`, which starts a fade-to-
black overlay (`duration = 0.25s`). At the midpoint:
1. `prevScene.OnLeave` (if any) is queued.
2. `currentScene` is set to the new name.
3. `State.NoteVisit(name)` bumps the visit counter.
4. Actors are placed at their `SceneActor.At` positions.
5. The new scene's `Music` plays.
6. `newScene.OnEnter` is queued.
The fade-from-black plays after the midpoint. During the fade-out half,
`engine.Update` returns early — input is frozen briefly.
The initial scene (from `StartAt`) is set **without** a transition so the
intro script runs immediately.
---
## 17. Validation
```go
func (g *Game) Validate() error
```
Run by `Run` before entering the Ebiten loop, and again from your tests.
It cross-checks:
- `StartAt` points to a registered scene.
- Every scene has a non-empty `Background` referencing a registered
`Asset`.
- Optional `Scene.Music` (if non-empty) references a registered `Asset`.
- Every `SceneActor.CharacterName` is a registered character.
- An active theme is selected and registered.
Returns the first error wrapping one of the `Err...` sentinels (so callers
can `errors.Is` against them). Duplicate-name registration is caught
eagerly at `Register` time via panic.
---
## 18. Save and load
```go
// pncdsl/state.save.go
func (g *Game) Save(slot int) error
func (g *Game) Load(slot int) error
```
Slots are written as JSON files under `g.SaveDir` (default `saves/`,
relative to the working directory), one file per slot named
`slot<N>.json`. The save captures the **mutable runtime state**:
- `currentScene`, the active verb, and the active theme.
- Every character's position, target, and moving flag.
- The full `State`: flags, vars, visited and talked counters.
- The inventory item list plus the currently selected slot.
Static registrations (items, scenes, characters, dialogues, scripts,
assets, verbs, widgets, themes) are **not** persisted — they are
reconstructed by `domain.Build()` on every launch. References in the
save are validated against the current managers before any runtime
state is touched, so a corrupt or schema-drift save returns an error
without mutating the live `*Game`.
What is **not** saved:
- The in-flight script `Runner` or any active dialog. `Load` cancels
both, so saves are effectively taken at an idle/ready boundary.
- The animation playback state. After load, characters are placed at
the saved position; the next idle frame re-derives the clip.
- Walkbox path queues. If a character is still `moving`, `tickCharacters`
rebuilds a one-step straight-line path from `pos` to `target` so the
walk finishes.
`Var` values are JSON-marshaled as-is. Numbers round-trip through
`float64`, strings stay strings, and any value that survives
`encoding/json` round-tripping survives the save.
The save format is versioned (`saveVersion`); loading a file from a
future version returns an error rather than silently truncating fields.
---
## 19. Errors
```go
// pncdsl/core.errors.go
var (
ErrUnknownAsset = errors.New("pncdsl: unknown asset")
ErrUnknownScene = errors.New("pncdsl: unknown scene")
ErrUnknownItem = errors.New("pncdsl: unknown item")
ErrUnknownCharacter = errors.New("pncdsl: unknown character")
ErrUnknownDialogue = errors.New("pncdsl: unknown dialogue")
ErrUnknownDialogueNode = errors.New("pncdsl: unknown dialogue node")
ErrUnknownScript = errors.New("pncdsl: unknown script")
ErrUnknownVerb = errors.New("pncdsl: unknown verb")
ErrDuplicateName = errors.New("pncdsl: duplicate name")
ErrNoStartScene = errors.New("pncdsl: StartAt not set or unknown scene")
ErrSceneMissingBackground = errors.New("pncdsl: scene has no background")
)
```
All wrap-able with `fmt.Errorf("%w: …", err, ctx)` and checkable with
`errors.Is`. `Manager.Register` and `MustGet` use `panic` instead of
returning these errors because they signal construction-time bugs that
should crash loudly in development.
---
## 20. Testing
```bash
go build ./...
```
The library is single-package and has no in-tree unit tests at this
milestone — the manager + action primitives are intentionally small
enough that the `pncdsl-demo` repo's `build_test.go` (a headless
`Build() + Validate()` smoke test) covers the integration surface:
```go
func TestBuildValidates(t *testing.T) {
g := domain.Build()
if err := g.Validate(); err != nil {
t.Fatalf("validate: %v", err)
}
}
```
Drop a similar test into any project that consumes the library — it
opens no window and finishes in milliseconds, so it's a cheap CI gate.
Library-internal unit tests are not shipped yet; the building blocks are
small enough to verify through smoke runs
of the demo for the time being.
### 20.1 Useful runtime debug switches
```go
pncdsl.DebugLog = true // logf output to stderr (script queue, audio, scene change)
&pncdsl.HotspotDebug{Enabled: true} // start with the F1 overlay on
```
---
## 21. Project layout
All library source files live at the repo root; no nested package
directory. The naming convention is `theme.identifier.go` — `ls core.*`
or `ls ui.*` instantly groups related sources.
```
pncdsl/ # module git.teletypegames.org/games/pncdsl
├── go.mod
├── go.sum
│
├── core.doc.go # package docs
├── core.manager.go # Manager[T Named], Named, TypeLabel
├── core.game.go # Game aggregate, runtime state, helpers
├── core.engine.go # ebiten.Game adapter (Update/Draw/Layout)
├── core.dsl.go # Run()
├── core.errors.go # sentinel errors
│
├── util.geometry.go # Point, Rectangle, Polygon, Shape
├── util.timer.go # Timer helper
├── util.log.go # DebugLog + logf
│
├── asset.def.go # Asset, AssetKind
├── asset.manager.go # AssetManager alias + lazy loader
├── asset.audio.go # AudioPlayer (WAV/OGG/MP3, looping music)
├── asset.text.go # drawText / wrapText helpers
│
├── scene.def.go # Scene, SceneActor
├── scene.manager.go # SceneManager alias
├── scene.hotspot.go # Hotspot, CursorKind
├── scene.trigger.go # Trigger + rising-edge engine sweep
├── scene.path.go # walkbox routing (BFS over polygon adjacency)
├── scene.transition.go # fade-to-black overlay (internal)
├── scene.camera.go # Camera (stub identity transform)
│
├── item.def.go # Item
├── item.manager.go # ItemManager alias
├── item.inventory.go # Inventory
│
├── actor.def.go # Character
├── actor.manager.go # CharacterManager alias
├── actor.animation.go # AnimationClip + tickAnimation
│
├── dialog.def.go # Dialogue, DialogueNode, DialogueChoice
├── dialog.manager.go # DialogueManager alias
│
├── action.def.go # Action, Runner, Ctx, Status + every built-in action
├── action.condition.go # Condition interface + combinators
├── action.script.go # Script entity
├── action.manager.go # ScriptManager alias
│
├── state.def.go # State (flags, vars, visited, talked)
├── state.save.go # Save/Load JSON persistence
│
├── input.def.go # Input (consume-on-use)
│
├── ui.widget.go # Widget interface, UICtx, Size, Align
├── ui.manager.go # UIManager alias + reversed/ordered iterators
├── ui.theme.go # Theme + ThemeManager
├── ui.theme_presets.go # 4 preset themes
├── ui.defaults.go # RegisterDefaultUI/RadialVerbUI/RichUI
├── ui.verb.go # Verb + VerbManager
├── ui.verb_bar.go # VerbBar widget
├── ui.verb_radial.go # RadialVerbs widget
├── ui.inventory.go # InventoryBar widget
├── ui.status.go # StatusLine widget
├── ui.speech.go # SpeechBubble widget
├── ui.dialog_box.go # DialogBox widget
├── ui.end_card.go # EndCard widget
├── ui.cursor.go # Cursor widget
├── ui.hotspot_debug.go # HotspotDebug widget
├── ui.panel.go # Panel widget
├── ui.top_bar.go # TopBar widget
├── ui.character_panel.go # CharacterPanel widget + CharStat
├── ui.chat_log.go # ChatLog widget
│
├── LICENSE.md # MIT
└── README.md # this file
```
The companion demo project (`pncdsl-demo`) lives in its own repo at
<ssh://git@git.teletypegames.org:2222/games/pncdsl-demo>. It consumes this
package via `require git.teletypegames.org/games/pncdsl …` in its `go.mod` —
no in-tree coupling.
---
## 22. License
MIT — see [`LICENSE.md`](LICENSE.md). Copyright © 2026 Teletype Games.
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