[makspll]

Stacked on #648. Third of the script system PRs.

Ordering

• :after_script_system(label, attachment) / :before_script_system(..) order against another script's system. The (attachment, label) pair is resolved through ScriptSystems to that system's slot set. The other system must already exist, otherwise add_system returns an error.
• :in_set(name) / :after_set(name) / :before_set(name): a name resolves to a Rust set the game registered with app.register_script_system_set(name, set) (ScriptSystemSetRegistry), otherwise to ScriptNamedSet(name), which scripts share to group their systems. Each distinct name is interned once.
• Every resolved set is recorded in orders_against, so a slot isn't recycled while another system orders against it.

Run conditions

• bms.conditions is a namespace value holding the ScriptRunCondition type, the same way bms.world holds World. Its static functions build conditions: resource_exists, resource_changed, resource_added, any_with_component, on_timer(secs), run_once, not_, and_, or_. The combinators end in _ because not, and and or are Lua keywords.
• :run_if(c) stacks; all conditions must hold.
• Conditions are evaluated by ScriptConditionSystem, a ReadOnlySystem passed to Bevy's run_if. It declares exactly what it reads:
  • resources: add_resource_read
  • any_with_component: a With<C> query's access
  • on_timer: a read of Time
• Resources are entities in Bevy 0.20, so resource_changed / resource_added read change ticks through resource_entities() and get_change_ticks_by_id. Every top-level condition is evaluated each run, so timers keep ticking. and_ / or_ short-circuit, like Bevy's combinators.
• New dependencies: bevy_time in core, for on_timer; bevy_mod_scripting_bindings_domain in functions, for the namespace value's type info.

Tests

• Lua: ordering by script system and by named set (checks both the schedule graph and the actual run order), every condition and combinator, and the errors for a missing script system and for a negative timer interval.
• Rust: resource_changed across runs, on_timer with an advanced Time, ordering against a registered Rust set.

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[semanticdiff-com]

Review changes with  

Changed Files

File	Status
crates/bevy_mod_scripting_bindings/src/builtins.rs	40% smaller
crates/bevy_system_reflection/src/lib.rs	35% smaller
crates/bevy_mod_scripting_bindings/src/script_component.rs	17% smaller
crates/bevy_mod_scripting_functions/src/core.rs	6% smaller
crates/bevy_mod_scripting_bindings/src/world_extensions.rs	4% smaller
crates/bevy_mod_scripting_core/src/script_system.rs	4% smaller
AGENTS.md	Unsupported file format
assets/definitions/bindings.d.lua	Unsupported file format
assets/tests/add_system/run_conditions.lua	0% smaller
assets/tests/add_system/systems_order_by_script_system_and_set.lua	0% smaller
assets/tests/export_reload/lua/caller.lua	0% smaller
assets/tests/export_reload/lua/exporter.lua	0% smaller
assets/tests/export_reload/rune/caller.rn	Unsupported file format
assets/tests/export_reload/rune/exporter.rn	Unsupported file format
crates/bevy_mod_scripting_bindings/src/lib.rs	0% smaller
crates/bevy_mod_scripting_bindings/src/system_set.rs	0% smaller
crates/bevy_mod_scripting_core/Cargo.toml	Unsupported file format
crates/bevy_mod_scripting_functions/Cargo.toml	Unsupported file format
crates/bindings/bevy_mod_scripting_bevy_asset_bindings/src/lib.rs	0% smaller
crates/bindings/bevy_mod_scripting_bevy_camera_bindings/src/lib.rs	0% smaller
crates/bindings/bevy_mod_scripting_bevy_gizmos_bindings/src/lib.rs	0% smaller
crates/bindings/bevy_mod_scripting_bevy_input_bindings/src/lib.rs	0% smaller
crates/bindings/bevy_mod_scripting_bevy_text_bindings/src/lib.rs	0% smaller
crates/bindings/bevy_mod_scripting_bevy_time_bindings/src/lib.rs	0% smaller
crates/bindings/bevy_mod_scripting_bevy_transform_bindings/src/lib.rs	0% smaller
crates/bindings/bevy_mod_scripting_bevy_ui_bindings/src/lib.rs	0% smaller
crates/bindings/bevy_mod_scripting_bevy_window_bindings/src/lib.rs	0% smaller
docs/src/ReleaseNotes/0.23-to-0.24.md	Unsupported file format
docs/src/ScriptSystems/introduction.md	Unsupported file format

[github-actions]

Bencher Report

Project	Bevy Scripting
Branch	agent/script-systems-scheduling
Testbed	linux-gha

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