# Components

## Gears workbench

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

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## Datums

Datums (`mods/datums/`) is a 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 that selects the 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.

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## Solver

Solver (`mods/solver/`) is an assembly solver research addon (GNN-based). Pure Python, priority 10. Provides `KindredSolverBackend` for experimental assembly constraint solving.

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## Origin commands (C++)

The Origin abstraction (`src/Gui/FileOrigin.h`) provides a backend-agnostic interface for document storage. Commands delegate to the active `FileOrigin` implementation (currently `LocalFileOrigin` for local files, `SiloOrigin` via `mods/silo/freecad/silo_origin.py` for Silo-tracked documents).

**Registered commands (5):**

| Command | Function | Icon |
|---------|----------|------|
| `Origin_Commit` | Commit changes as a new revision | `silo-commit` |
| `Origin_Pull` | Pull a specific revision from the origin | `silo-pull` |
| `Origin_Push` | Push local changes to the origin | `silo-push` |
| `Origin_Info` | Show document information from origin | `silo-info` |
| `Origin_BOM` | Show Bill of Materials for this document | `silo-bom` |

These appear in the File menu and "Origin Tools" toolbar across all workbenches (see `src/Gui/Workbench.cpp`).

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## Silo workbench

**Registered commands (14):**

| Command | Function |
|---------|----------|
| `Silo_New` | Schema-driven item creation form — fetches categories and properties from the Silo API at runtime |
| `Silo_Open` | Open file from Silo database |
| `Silo_Save` | Save to Silo (create revision) |
| `Silo_Commit` | Commit current revision |
| `Silo_Pull` | Pull latest revision from server |
| `Silo_Push` | Push local changes to server |
| `Silo_Info` | View item metadata and history |
| `Silo_BOM` | Bill of materials dialog (BOM + Where Used) |
| `Silo_TagProjects` | Assign project tags |
| `Silo_Rollback` | Rollback to previous revision |
| `Silo_SetStatus` | Set revision status (draft/review/released/obsolete) |
| `Silo_Settings` | Configure API URL, projects dir, SSL certificates |
| `Silo_Auth` | Login/logout authentication panel |

**Global integration** via the origin system in `src/Gui/`:
- File toolbar: `Std_Origin` selector widget + `Std_New`/`Std_Open`/`Std_Save` (delegate to current origin)
- Origin Tools toolbar: `Origin_Commit`/`Origin_Pull`/`Origin_Push`/`Origin_Info`/`Origin_BOM` (auto-disable by capability)
- Silo origin registered at startup by `mods/silo/InitGui.py` via `kindred_sdk.register_origin()`

**Dock panels:**
- Database Auth (2000ms) -- Login/logout and API token management
- Database Activity (4000ms) -- Real-time server event feed via SSE (Server-Sent Events) with automatic reconnection and exponential backoff
- Start Panel -- In-viewport landing page with recent files and Silo integration

**Server architecture:** Go REST API (38+ routes) + PostgreSQL + MinIO S3. Authentication via local (bcrypt), LDAP, or OIDC backends. SSE endpoint for real-time event streaming. See `docs/src/silo-server/` for server documentation.

**LibreOffice Calc extension** ([silo-calc](https://git.kindred-systems.com/kindred/silo-calc.git)): BOM management, item creation, and AI-assisted descriptions via OpenRouter API. Shares the same Silo REST API and auth token system via the shared [silo-client](https://git.kindred-systems.com/kindred/silo-client.git) package.

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## Theme

**Canonical source:** `src/Gui/Stylesheets/KindredCreate.qss`

The PreferencePacks copy (`src/Gui/PreferencePacks/KindredCreate/KindredCreate.qss`) is generated at build time via `configure_file()` in `src/Gui/PreferencePacks/CMakeLists.txt`. Only the Stylesheets copy needs to be maintained.

Notable theme customizations beyond standard Catppuccin colors:
- `QGroupBox::indicator` styling to match `QCheckBox::indicator` (consistent checkbox appearance)
- `QLabel[haslink="true"]` link color (`#b4befe` Catppuccin Lavender) -- picked up by FreeCAD to set `QPalette::Link`
- Spanning-line tree branch indicators

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## Icon infrastructure

### Qt resource icons (`src/Gui/Icons/`)

5 `silo-*` SVGs registered in `resource.qrc`, used by C++ Origin commands:

`silo-bom.svg`, `silo-commit.svg`, `silo-info.svg`, `silo-pull.svg`, `silo-push.svg`

### Silo module icons (`mods/silo/freecad/resources/icons/`)

10 SVGs loaded at runtime by the `_icon()` function in `silo_commands.py`:

`silo-auth.svg`, `silo-bom.svg`, `silo-commit.svg`, `silo-info.svg`, `silo-new.svg`, `silo-open.svg`, `silo-pull.svg`, `silo-push.svg`, `silo-save.svg`, `silo.svg`

### Palette

All silo-* icons use the Catppuccin Mocha color scheme. See `icons/kindred/README.md` for palette specification and icon design standards.