Differences

This shows you the differences between two versions of the page.

--- scripting [2026/02/11 23:19] – dooskington
+++ scripting [2026/02/11 23:21] (current) – dooskington
@@ Line 1: / Line 1: @@
-# Server-side Lua scripting
+==== Server-side Lua scripting ====
-This page documents the game-server Lua scripting system and how to bind scripts through `ScriptComponent`.
+This page documents the game-server Lua scripting system and how to bind scripts through ''ScriptComponent''.
 Related pages:
-- [[scripting/lua|Lua API reference]]
+  * [[scripting/lua|Lua API reference]]
-## Where scripts live
+==== Where scripts live ====
-- Script resources are loaded from `server/game-server/res/scripts`.
+  * Script resources are loaded from ''server/game-server/res/scripts''.
-- A script resource name is its path relative to `res/scripts` without the `.lua` extension.
+  * A script resource name is its path relative to ''res/scripts'' without the ''.lua'' extension.
-  - Example: `res/scripts/player-init.lua` is referenced as `player-init.lua` in component data and resolved to resource name `player-init` internally.
+    * Example: ''res/scripts/player-init.lua'' is referenced as ''player-init.lua'' in component data and resolved to resource name ''player-init'' internally.
-- Files under `res/scripts/include/` are preloaded as Lua modules and can be used with `require("...")`.
+  * Files under ''res/scripts/include/'' are preloaded as Lua modules and can be used with ''require("...")''.
-  - Example: `res/scripts/include/common.lua` can be loaded as `require("common")`.
+    * Example: ''res/scripts/include/common.lua'' can be loaded as ''require("common")''.
-## Script execution model
+==== Script execution model ====
-The `ScriptSystem` runs once per server tick and drains queued `ScriptEvent`s.
+The ''ScriptSystem'' runs once per server tick and drains queued ''ScriptEvent'' values.
 Main execution paths:
-- `ScriptComponent.on_init` on entity spawn.
+  * ''ScriptComponent.on_init'' on entity spawn.
-- `ScriptComponent.on_hit` on `OnEntityAttackedEvent` for the target entity.
+  * ''ScriptComponent.on_hit'' on ''OnEntityAttackedEvent'' for the target entity.
-- Interaction, dialog, item, and other systems can also queue script execution with a `ScriptContext`.
+  * Interaction, dialog, item, and other systems can also queue script execution with a ''ScriptContext''.
-The global `Context` userdata is set before each script run. The concrete fields depend on which `ScriptContext` variant triggered execution.
+The global ''Context'' userdata is set before each script run. The concrete fields depend on which ''ScriptContext'' variant triggered execution.
-## Using `ScriptComponent`
+==== Using ScriptComponent ====
-Add a `[script]` table to an entity resource (`res/ents/*.toml`):
+Add a ''[script]'' table to an entity resource (''res/ents/*.toml''):
-```toml
+<code toml>
 [script]
 on_init = "player-init.lua"
 on_hit = "tutorial/training-dummy-tutorial-hit.lua"
-```
+</code>
-### `on_init`
+=== on_init ===
-- Runs when the entity is spawned.
+  * Runs when the entity is spawned.
-- Context type: `DefaultScriptContextData`
+  * Context type: ''DefaultScriptContextData''
-  - `Context:ent_id()`
+    * ''Context:ent_id()''
-  - `Context:target_ent_id()` (typically `nil` here)
+    * ''Context:target_ent_id()'' (typically ''nil'' here)
-### `on_hit`
+=== on_hit ===
-- Runs when the entity is attacked.
+  * Runs when the entity is attacked.
-- Context type: `OnEntityAttackedScriptContextData`
+  * Context type: ''OnEntityAttackedScriptContextData''
-  - `Context:src_ent_id()`
+    * ''Context:src_ent_id()''
-  - `Context:tgt_ent_id()`
+    * ''Context:tgt_ent_id()''
-  - `Context:damage_amount()`
+    * ''Context:damage_amount()''
-  - `Context:damage_type()` (bitflags; see `include/damage_type.lua`)
+    * ''Context:damage_type()'' (bitflags; see ''include/damage_type.lua'')
-### Inline vs resource scripts
+=== Inline vs resource scripts ===
-Both `on_init` and `on_hit` support two forms:
+Both ''on_init'' and ''on_hit'' support two forms:
-. **Resource reference** (string ending in `.lua`):
+  - Resource reference (string ending in ''.lua''):
-   - The server looks up the resource and executes it.
+    - The server looks up the resource and executes it.
-. **Inline Lua source** (any other string):
+  - Inline Lua source (any other string):
-   - The string itself is executed as Lua code.
+    - The string itself is executed as Lua code.
 For maintainability, prefer resource scripts over inline Lua.
-## Script module (`include/`) usage
+==== Script module (include/) usage ====
-Modules under `res/scripts/include` are preloaded and added to Lua `package.preload` at startup and script reload.
+Modules under ''res/scripts/include'' are preloaded and added to Lua ''package.preload'' at startup and script reload.
 Example:
-```lua
+<code lua>
 local common = require("common")
 local tutorial = require("tutorial")
 local DamageType = require("damage_type")
-```
+</code>
 Useful built-in modules currently in the repo:
-- `common` (helper wrappers, e.g. `common.open_modal`)
+  * ''common'' (helper wrappers, e.g. ''common.open_modal'')
-- `damage_type` (damage bit constants)
+  * ''damage_type'' (damage bit constants)
-- `stat` (stat IDs)
+  * ''stat'' (stat IDs)
-- `tutorial` (tutorial constants/content)
+  * ''tutorial'' (tutorial constants/content)
-## Resource validation
+==== Resource validation ====
 On resource load/reload, the server validates script references in entity and item resources.
-For `ScriptComponent`, only values ending in `.lua` are validated as resource names. Missing resources are logged as validation errors.
+For ''ScriptComponent'', only values ending in ''.lua'' are validated as resource names. Missing resources are logged as validation errors.
-## Reload and iteration workflow
+==== Reload and iteration workflow ====
 Recommended flow while developing scripts:
-. Edit files in `res/scripts` or entity resources in `res/ents`.
+  - Edit files in ''res/scripts'' or entity resources in ''res/ents''.
-. Use `/reload_resources script` (dev command) to reload `ScriptDb`.
+  - Use ''/reload_resources script'' (dev command) to reload ''ScriptDb''.
-. Scripts under `include/` are reloaded and re-preloaded.
+  - Scripts under ''include/'' are reloaded and re-preloaded.
-. Trigger the entity behavior in-game.
+  - Trigger the entity behavior in-game.
+For quick one-off evaluation, developers can use ''/lua [code]'' which queues ad-hoc script execution with default context.
-For quick one-off evaluation, devs can use `/lua [code]` which queues an ad-hoc script execution with default context.