# CLAUDE.md — Developer Context for Kindred Create

## Project Overview

Kindred Create is a fork of FreeCAD 1.0+ that adds integrated tooling for professional engineering workflows. It ships a context-aware UI system, five addon modules (SDK, Gears, Datums, Silo, Solver), a KCSDK C++ extension layer, a Catppuccin Mocha dark theme, and a pluggable file origin layer on top of FreeCAD's parametric modeling core.

- **Kindred Create version:** 0.1.5
- **FreeCAD base version:** 1.2.0
- **License:** LGPL-2.1-or-later
- **Repository:** `git.kindred-systems.com/kindred/create` (Gitea)
- **Main branch:** `main`

## Quick Start

```bash
git clone --recursive ssh://git@git.kindred-systems.com:2222/kindred/create.git
cd create
pixi run configure      # CMake configure (debug by default)
pixi run build          # Build
pixi run install        # Install to build dir
pixi run freecad        # Launch
pixi run test           # Run C++ tests (ctest)
pixi run test-kindred   # Run Python/Kindred tests
```

Build variants: append `-debug` or `-release` (e.g., `pixi run build-release`). See `CMakePresets.json` for platform-specific presets (Linux x86_64/aarch64, macOS Intel/ARM, Windows x64).

## Repository Structure

```
create/
├── src/
│   ├── App/                    Core application (C++)
│   ├── Base/                   Base classes, type system, persistence (C++)
│   ├── Gui/                    GUI framework (C++)
│   │   ├── SDK/                KCSDK C++ library (Kindred feature)
│   │   │   ├── bindings/       pybind11 module (kcsdk.so)
│   │   │   ├── IPanelProvider.h    Dock panel interface
│   │   │   ├── IToolbarProvider.h  Toolbar interface
│   │   │   ├── IMenuProvider.h     Menu interface
│   │   │   ├── SDKRegistry.h       Provider registry
│   │   │   ├── ThemeEngine.h       Runtime theme token access
│   │   │   └── WidgetBridge.h      Qt widget creation bridge
│   │   ├── EditingContext.h    Editing context resolver (Kindred feature)
│   │   ├── BreadcrumbToolBar.h Breadcrumb navigation widget (Kindred feature)
│   │   ├── FileOrigin.h        Abstract origin interface (Kindred feature)
│   │   ├── OriginManager.h     Origin lifecycle management
│   │   ├── CommandOrigin.cpp   Origin_Commit/Pull/Push/Info/BOM commands
│   │   ├── ApplicationPy.h     All FreeCADGui.* Python bindings
│   │   ├── Application.h       App signals (fastsignals)
│   │   ├── Stylesheets/        QSS theme files
│   │   └── PreferencePacks/    Preference configurations (build-time generated)
│   ├── Mod/                    FreeCAD modules (PartDesign, Assembly, Sketcher, etc.)
│   │   └── Create/            Kindred Create module
│   │       ├── App/            C++ app-side module (AppCreate)
│   │       ├── Gui/            C++ GUI-side module (AppCreateGui)
│   │       ├── Init.py         Console bootstrap — loads addons
│   │       ├── InitGui.py      GUI bootstrap — loads addons, kc_format, update checker
│   │       ├── addon_loader.py Manifest-driven loader with dependency resolution
│   │       ├── kc_format.py    .kc file format preservation
│   │       ├── silo_document.py .kc tree building observer
│   │       ├── silo_tree.py    Silo metadata tree builder
│   │       ├── silo_objects.py  Silo tree FeaturePython objects
│   │       ├── silo_viewers.py  Silo tree MDI viewers
│   │       └── silo_viewproviders.py  Silo tree ViewProvider icons
│   └── 3rdParty/              Vendored dependencies
│       ├── OndselSolver/      [submodule] Assembly constraint solver (forked)
│       ├── FastSignals/       Signal/slot library (NOT Boost)
│       └── GSL/               [submodule] Microsoft Guidelines Support Library
├── mods/                       Kindred addon modules
│   ├── sdk/                   Addon SDK — stable API contract (priority 0)
│   ├── gears/                 [submodule] Parametric gear workbench (priority 40)
│   ├── datums/                [submodule] Unified datum creator (priority 45)
│   ├── silo/                  [submodule] PLM workbench (priority 60)
│   └── solver/                [submodule] Assembly solver research (priority 10)
├── reference/                  Archived addons (not built)
│   ├── ztools/                Archived — commands migrated to datums + core
│   └── quicknav/              Archived — navigation addon
├── docs/                       mdBook documentation + architecture docs
├── tests/                      C++ unit tests (GoogleTest)
├── package/                    Packaging (debian/, rattler-build/)
├── resources/                  Branding, icons, desktop integration
├── cMake/                      CMake helper modules
├── .gitea/workflows/           CI/CD pipelines
├── CMakeLists.txt              Root build configuration (CMake 3.22.0+)
├── CMakePresets.json           Platform build presets
└── pixi.toml                  Pixi environment and build tasks
```

## Build System

- **Primary:** CMake 3.22.0+ with Ninja generator
- **Environment:** [Pixi](https://pixi.sh) (conda-forge) manages all dependencies
- **Key deps:** Qt 6.8.x, Python 3.11.x, OpenCASCADE 7.8.x, PySide6, Boost, VTK, SMESH
- **Presets:** `conda-linux-debug`, `conda-linux-release`, `conda-macos-debug`, `conda-macos-release`, `conda-windows-debug`, `conda-windows-release`
- **Tasks summary:**

| Task | Description |
|------|-------------|
| `pixi run configure` | CMake configure (debug) |
| `pixi run build` | Build (debug) |
| `pixi run install` | Install to build dir |
| `pixi run freecad` | Launch FreeCAD |
| `pixi run test` | C++ tests via ctest |
| `pixi run test-kindred` | Python/Kindred test suite |

## Architecture Patterns

### Signals — Use FastSignals, NOT Boost

```cpp
#include <fastsignals/signal.h>
// See src/Gui/Application.h:121-155 for signal declarations
```

All signals in `src/Gui/` use `fastsignals::signal`. Never use Boost.Signals2.

### Type Checking Across Modules

Avoid header dependencies between `src/Gui/` and `src/Mod/` by using runtime type checks:

```cpp
auto type = Base::Type::fromName("Sketcher::SketchObject");
if (obj->isDerivedFrom(type)) { ... }
```

### Python Bindings

All `FreeCADGui.*` functions go in `src/Gui/ApplicationPy.h` and `src/Gui/ApplicationPy.cpp`. Use `METH_VARARGS` only (no `METH_KEYWORDS` in this file). Do not create separate files for new Python bindings.

### KCSDK C++ Layer

The `src/Gui/SDK/` directory provides a C++ shared library (`libKCSDK`) with pybind11 bindings (`kcsdk` Python module). This is the stable C++ API for Kindred features:

- **`IPanelProvider`** — interface for registering dock panels
- **`IToolbarProvider`** — interface for toolbar registration
- **`IMenuProvider`** — interface for menu registration
- **`SDKRegistry`** — central registry for all providers
- **`ThemeEngine`** — runtime access to Catppuccin Mocha theme tokens
- **`WidgetBridge`** — Qt widget creation from Python factories

Python addons access these through `kindred_sdk.*` wrappers (e.g., `kindred_sdk.register_dock_panel()` routes through `kcsdk.register_panel()` + `kcsdk.create_panel()`). Do not use `kcsdk` directly from addons — always use `kindred_sdk`.

### Toolbar Visibility

Use `ToolBarItem::DefaultVisibility::Unavailable` to hide toolbars by default, then `ToolBarManager::setState(ForceAvailable)` to show them contextually. This pattern is proven by the Sketcher module.

The `appendToolbar` Python API accepts an optional 3rd argument: `"Visible"`, `"Hidden"`, or `"Unavailable"`.

### Editing Context System

The `EditingContextResolver` singleton (`src/Gui/EditingContext.h/.cpp`) drives the context-aware UI. It evaluates registered context definitions in priority order and activates the matching one, setting toolbar visibility and updating the `BreadcrumbToolBar`.

Built-in contexts: `sketcher.edit`, `assembly.edit`, `partdesign.feature`, `partdesign.body`, `assembly.idle`, `spreadsheet`, `empty_document`, `no_document`.

Python API (prefer `kindred_sdk` wrappers over direct `FreeCADGui` calls):
- `kindred_sdk.register_context()` — register a new context
- `kindred_sdk.register_overlay()` — conditional toolbar overlay
- `kindred_sdk.inject_commands()` — add commands to existing contexts
- `kindred_sdk.current_context()` — query active context
- `kindred_sdk.refresh_context()` — force re-evaluation

### Addon Loading

Addons in `mods/` are loaded by `src/Mod/Create/addon_loader.py`. Each addon provides a `package.xml` at the mod root with `<kindred>` extensions declaring version bounds, load priority, and dependencies. The loader discovers manifests, validates version bounds, and resolves load order via topological sort on dependencies, breaking ties by `(load_priority, name)`.

Current load order: **sdk** (0) → **solver** (10) → **gears** (40) → **datums** (45) → **silo** (60).

A `<workbench>` tag in `package.xml` is required for `InitGui.py` to be loaded, even if no actual workbench is registered. The `<subdirectory>` element within `<workbench>` specifies where `Init.py`/`InitGui.py` live relative to the mod root (e.g., `freecad` for silo, `datums` for datums, `./` for sdk).

### Deferred Initialization

GUI setup uses `QTimer.singleShot` with staggered delays. Create core (`src/Mod/Create/InitGui.py`) handles:
- 500ms: `.kc` file format registration
- 10000ms: Update checker

Each addon manages its own deferred setup in its `InitGui.py`. For example, Silo (`mods/silo/InitGui.py`) defers:
- 500ms: kindred:// URL handler
- 600ms: Document observer for .kc tree building
- 2000ms: Auth dock panel (via `kindred_sdk.register_dock_panel`)
- 2500ms: Silo overlay context
- 3000ms: First-start settings check
- 4000ms: Activity dock panel (via `kindred_sdk.register_dock_panel`)

### Unified Origin System

File operations (New, Open, Save, Commit, Pull, Push) are abstracted behind `FileOrigin` (`src/Gui/FileOrigin.h`). `LocalFileOrigin` handles local files; `SiloOrigin` (`mods/silo/freecad/silo_origin.py`) backs Silo-tracked documents. The active origin is selected automatically based on document properties (`SiloItemId`, `SiloPartNumber`).

Origins are registered via `kindred_sdk.register_origin()`. Query functions (`list_origins`, `active_origin`, `get_origin`, `set_active_origin`) route through the `kcsdk` C++ module.

## Submodules

| Path | Repository | Branch | Purpose |
|------|------------|--------|---------|
| `mods/silo` | `git.kindred-systems.com/kindred/silo-mod` | `main` | PLM workbench (includes silo-client submodule) |
| `mods/gears` | `git.kindred-systems.com/kindred/gears` | `main` | Parametric gear generation workbench |
| `mods/datums` | `git.kindred-systems.com/kindred/datums` | `main` | Unified datum creator (plane, axis, point) |
| `mods/solver` | `git.kindred-systems.com/kindred/solver` | `main` | Assembly solver research (GNN-based) |
| `src/3rdParty/OndselSolver` | `git.kindred-systems.com/kindred/solver` | — | Constraint solver (forked with NR fix) |
| `src/3rdParty/GSL` | `github.com/microsoft/GSL` | — | Guidelines Support Library |
| `src/Mod/AddonManager` | `github.com/FreeCAD/AddonManager` | — | FreeCAD addon manager |
| `tests/lib` | `github.com/google/googletest` | — | C++ test framework |

Update a submodule:
```bash
cd mods/silo
git checkout main && git pull
cd ../..
git add mods/silo
git commit -m "chore: update silo submodule"
```

Initialize all submodules: `git submodule update --init --recursive`

## Key Addon Modules

### SDK (`mods/sdk/`)

Stable API contract for addons. Python package `kindred_sdk` wraps the KCSDK C++ module, providing:
- **Editing contexts:** `register_context()`, `register_overlay()`, `inject_commands()`, `refresh_context()`
- **Origins:** `register_origin()`, `unregister_origin()`, `list_origins()`, `active_origin()`
- **Dock panels:** `register_dock_panel(object_name, title, factory, area, delay_ms)`
- **Commands:** `register_command(cmd_id, classname, pixmap, tooltip)`
- **Theme:** `get_theme_tokens()`, `load_palette()` (Catppuccin Mocha YAML palette)
- **Toolbars/Menus:** `register_toolbar()`, `register_menu()`
- **Version:** `create_version()`, `freecad_version()`

Addons should use `kindred_sdk.*` instead of `FreeCADGui.*` internals where possible.

### Gears (`mods/gears/`)

Parametric gear workbench. Provides `GearWorkbench` with gear generation and analysis tools. Code lives in `freecad/gears/` (workbench) and `pygears/` (computational library). Priority 40, depends on SDK.

### Datums (`mods/datums/`)

Unified datum creator that replaces the three stock PartDesign datum commands (Plane, Line, Point) with a single `Create_DatumCreator` command. Features:
- 16 smart creation modes (7 plane, 4 axis, 5 point)
- Auto-detection engine: selects best mode from geometry selection
- Mode override combo for manual selection
- Dynamic parameter UI (offset, angle, position, XYZ)
- Edit panel with real-time parameter updates via AttachExtension
- Injected into `partdesign.body` and `partdesign.feature` contexts via SDK

Source: `mods/datums/datums/` (command.py, core.py, panel.py, detection.py, edit_panel.py). Priority 45, depends on SDK.

### Silo (`mods/silo/`)

PLM workbench with 14 commands for parts lifecycle management. Go REST API server + PostgreSQL + MinIO backend. FreeCAD client communicates via shared `silo-client` submodule.

Structure: root-level `package.xml`/`Init.py`/`InitGui.py`, workbench code in `freecad/`, client library in `silo-client/`. All deferred setup (origin, overlay, dock panels, document observer) is self-contained in `mods/silo/InitGui.py`.

Silo origin detection: `silo_origin.py:ownsDocument()` checks for `SiloItemId`/`SiloPartNumber` properties on the active document. Origin registered via `kindred_sdk.register_origin()`.

### Solver (`mods/solver/`)

Assembly solver research addon (GNN-based). Pure Python, priority 10. Provides `KindredSolverBackend` for experimental assembly constraint solving.

## Theme

- **Canonical source:** `src/Gui/Stylesheets/KindredCreate.qss`
- The PreferencePacks copy at `src/Gui/PreferencePacks/KindredCreate/KindredCreate.qss` is **generated at build time** via `configure_file()`. Only edit the Stylesheets copy.
- Color palette: Catppuccin Mocha (26 colors + 14 semantic roles, defined in `mods/sdk/kindred_sdk/palettes/catppuccin-mocha.yaml`)
- Runtime access: `kindred_sdk.get_theme_tokens()` returns palette dict; C++ side via `ThemeEngine` in `src/Gui/SDK/`
- Default preferences: `src/Gui/PreferencePacks/KindredCreate/KindredCreate.cfg`

## Git Conventions

### Branch Names

`type/kebab-case-description`

Types: `feat/`, `fix/`, `chore/`, `docs/`, `refactor/`, `art/`

### Commit Messages

[Conventional Commits](https://www.conventionalcommits.org/):

```
type(scope): lowercase imperative description
```

| Prefix | Purpose |
|--------|---------|
| `feat:` | New feature |
| `fix:` | Bug fix |
| `chore:` | Maintenance, dependencies |
| `docs:` | Documentation only |
| `art:` | Icons, theme, visual assets |
| `refactor:` | Code restructuring |

Scopes: `solver`, `sketcher`, `editing-context`, `toolbar`, `datums`, `silo`, `gears`, `sdk`, `breadcrumb`, `gui`, `assembly`, `ci`, `theme`, or omitted.

### PR Workflow

1. Create a branch from `main`: `git checkout -b feat/my-feature main`
2. Commit with conventional commit messages
3. Push and open a PR against `main` via Gitea (or `tea pulls create`)
4. CI runs automatically on PRs

### Code Style

- **C++:** clang-format (`.clang-format`), clang-tidy (`.clang-tidy`)
- **Python:** black (100-char line length), pylint (`.pylintrc`)
- **Pre-commit hooks:** `pre-commit install` (runs clang-format, black, trailing-whitespace, etc.)

## CI/CD

- **Build:** `.gitea/workflows/build.yml` — runs on pushes to `main` and on PRs
- **Release:** `.gitea/workflows/release.yml` — triggered by `v*` tags, builds AppImage and .deb
- **Platform:** Currently Linux x86_64 only in CI; other platforms have presets but no runners yet

## Documentation

| Document | Content |
|----------|---------|
| `README.md` | Project overview, installation, usage |
| `CONTRIBUTING.md` | Branch workflow, commit conventions, code style |
| `docs/ARCHITECTURE.md` | Bootstrap flow, addon lifecycle, source layout |
| `docs/COMPONENTS.md` | Feature inventory (Silo, origin, theme, icons) |
| `docs/KNOWN_ISSUES.md` | Known issues, incomplete features, next steps |
| `docs/INTEGRATION_PLAN.md` | 5-layer architecture, phase status |
| `docs/CI_CD.md` | Build and release workflows |
| `docs/KC_SPECIFICATION.md` | .kc file format specification |
| `docs/UPSTREAM.md` | FreeCAD upstream merge strategy |
| `docs/INTER_SOLVER.md` | Assembly solver integration |
| `docs/BOM_MERGE.md` | BOM-Assembly bridge specification |

The `docs/src/` directory contains an mdBook site with detailed guides organized by topic (architecture, development, guide, reference, silo-server, solver).

## Issue Tracker

Issues are tracked on Gitea at `git.kindred-systems.com/kindred/create/issues`. Use the `tea` CLI for local interaction:

```bash
tea issues              # List open issues
tea issues 123          # View issue #123 details
tea pulls create        # Create a PR
```

## Known Issues and Pitfalls

1. **Silo auth not production-hardened** — LDAP/OIDC backends are coded but need infrastructure deployment
2. **No unit tests** for Silo FreeCAD commands or Go backend
3. **Assembly solver datum handling is minimal** — joints referencing datum planes/points may produce incorrect placement
4. **`Silo_BOM` requires Silo-tracked document** — unregistered documents show a warning with no registration path
5. **QSS edits** — only edit `src/Gui/Stylesheets/KindredCreate.qss`; the PreferencePacks copy is auto-generated
6. **Archived addons** — `reference/ztools/` and `reference/quicknav/` are archived source for reference only; they are not built or loaded