Add BlueprintEditor (Unreal-style visual scripting) with a UEVR Lua backend

[lobotomy-x]

Summary

Adds BlueprintEditor.h / BlueprintEditor.cpp — a self-contained Dear ImGui widget in the same two-file style as TextEditor that implements an Unreal Engine style Blueprint visual scripting editor for UObject-like class hierarchies — plus BlueprintLua.h / BlueprintLua.cpp, a UEVR Lua scripting backend that turns those graphs into ready-to-run scripts for the UEVR injector.

What's included

Reflection model (UObject mirror)

• TypeRegistry with classes, functions, events, properties and enums, built via a fluent API (.In(), .Out(), .Ret(), .Pure(), .Static(), .Keywords(), .Tooltip(), .Metadata())
• Inheritance chain (IsChildOf) drives object/class pin compatibility
• SetupDefaultRegistry() ships a sample UObject/AActor/APawn/ACharacter/component hierarchy plus kismet-style math, string, system and gameplay libraries

Graph model & rules

• Node kinds: events, custom events, function calls, property get/set, variable get/set, flow control (Branch, Sequence, For/While Loop, Do Once, Do N, Flip Flop, Gate), reroute knots and comments
• Unreal connection semantics: data inputs have one source, exec outputs one target (connecting to a full pin replaces the wire), Byte→Int→Float promotions, data-cycle rejection, one-instance-only events
• Pins use Unreal's type colors, exec arrows, hollow/filled circles and array grid icons

Interactive editing

• Pan (right/middle drag), zoom around cursor (30%–250%), Unreal-style grid + BLUEPRINT watermark
• Searchable, context-sensitive add-node palette on right-click; dragging a wire onto empty canvas opens the palette filtered to compatible actions and auto-connects the spawned node
• Box select, multi-node drag, alt-click to break links, double-click a wire to insert a reroute, comment boxes that resize and carry contained nodes, inline default-value editors (checkbox/drag/text/vector/enum/class combo)
• Copy/paste/duplicate through the ImGui clipboard, snapshot-based undo/redo, Del/Home/Ctrl+A/C/X/V/D/Z/Y shortcuts
• Line-based text serialization (SaveToString/LoadFromString) with escaping, used for persistence, clipboard and undo

UEVR Lua backend (BlueprintLua)

• SetupUEVRRegistry populates the registry with the UEVR Lua API surface: engine tick / slate / XInput / UI / reset callbacks as events, uevr.api and uevr.params.vr calls, UObject property/function access through UEVR's metatable bindings, XINPUT_STATE helpers and Lua-native math/string/logic utilities
• GenerateScript emits Lua: events → uevr.sdk.callbacks.on_* registrations, exec wires → statements, data wires → expressions (pure nodes inline, impure results captured in locals), variables → script-scope locals, flow control → native if/for/while plus state locals for Do Once / Do N / Flip Flop / Gate
• Bindings are data-driven Lua expression templates in registry metadata ({0}–{n} inputs, {target}, |-separated segments for multi-output pure functions) so game-specific APIs are one fluent line each

Example & docs

• example/blueprint.cpp demo (View → Blueprint Editor) building a sample ACharacter blueprint
• example/uevr.cpp demo (View → UEVR Lua Editor) with a haptics-on-button-press sample graph and a live syntax-highlighted preview of the generated script in a read-only TextEditor pane
• docs/blueprintEditor.md, docs/blueprintLua.md + README section
• One-line CI fix: the windows-2025 runner image no longer ships VS 2022, so the Windows workflow now lets CMake auto-detect the installed Visual Studio

Testing

• Everything compiles clean with -Wall -Wextra -Wpedantic -Werror under GCC 13 and Clang 18 against Dear ImGui v1.92.7; the full example/ CMake build (the same configuration CI runs) succeeds on Linux
• Headless behavior test exercised the graph API: event uniqueness, duplicate/mismatch/cycle link rejection, numeric promotion, object subtype covariance, byte-identical serialization round-trip, undo/redo, delete cleanup and string escaping
• Headless render test ran 30 ImGui frames simulating clicks, drags, wheel zoom, context menu, select-all and delete with no assertions
• Lua codegen test builds a UEVR graph programmatically, asserts the emitted script's structure, validates it with luac5.4 -p and executes it against a stubbed uevr API, confirming callbacks, branching, haptics, property writes and loops behave as modeled

🤖 Generated with Claude Code

https://claude.ai/code/session_011VwW7xyG1zN46RqMvHs8fL