subagent transcript

session 17f09f89 · workflow wf_4e894f41
← 17f09f89 · archive
delegated task
You are working on the FreeCAD -> WebAssembly port. Ground EVERYTHING in the real code; do not guess. - Source tree: /home/magik6k/lcad-wasm/freecad-p
▸ Magik
You are working on the FreeCAD -> WebAssembly port. Ground EVERYTHING in the real code; do not guess. - Source tree: /home/magik6k/lcad-wasm/freecad-port/FreeCAD (git branch wasm-port). CMake build dir (out-of-source, already configured): /opt/toolchains/src/freecad-gui-build — read /opt/toolchains/src/freecad-gui-build/CMakeCache.txt for BUILD_* flags and dep paths. Build binary: bin/FreeCAD.wasm (~180 MB). - Toolchain: emscripten, ASYNCIFY + JS exceptions (-fexceptions), SINGLE-THREADED (no pthreads). Static CPython 3.14 + static Qt 6.11 (wasm) + static OCCT + static Coin3D. Everything is statically linked; there is NO dlopen — Python C-extension modules are registered statically via PyImport_AppendInittab in the generated file src/Main/WasmInittab.cpp / WasmInittabGui.cpp (see also freecadWasmRegisterInittab in src/Main/MainGui.cpp). - CRITICAL wasm constraints you MUST check for and design around: (1) THREADING HANGS: any std::thread ctor / std::async(default or async policy) / QThreadPool / QtConcurrent / QThread worker HANGS or throws (no pthreads). Fix pattern: force synchronous/deferred on __EMSCRIPTEN__ (e.g. std::launch::deferred), or #ifndef FC_OS_WASM guard the worker and run inline. Example already in-tree: Mod/Sketcher/App/planegcs/GCS.cpp forced std::launch::deferred; App/Application.cpp guards _recomputeThread with #ifndef FC_OS_WASM; Gui/ProgressBar.cpp skips qApp->processEvents() on __EMSCRIPTEN__. (2) MODAL DIALOGS / NESTED EVENT LOOPS: QDialog::exec()/QMessageBox::exec()/QEventLoop::exec() may deadlock under asyncify when driven from outside the main loop. Task-panel (docked, non-modal) dialogs are preferred. (3) Reentrant ccalls from JS during asyncify suspend corrupt state — a QTimer command-pump (/fc-cmd.py) exists for JS->Python. QtWebEngine has NO wasm port (Web workbench / in-app help / real Start page can't use it). (4) Wasm guards used in-tree: __EMSCRIPTEN__ (compiler-provided) and FC_OS_WASM (FreeCAD-defined) — both are defined on wasm. - Built modules today: Part, Sketcher, Material, Start (+ kernel). Everything else is OFF (see BUILD_* in CMakeCache). - PySide/shiboken: FREECAD_USE_PYSIDE=OFF, FREECAD_USE_SHIBOKEN=OFF, PySide6_DIR/Shiboken6_DIR NOTFOUND. Python 'PySide'/'shiboken6' import fails at runtime ("Cannot load shiboken6"). Many workbenches (Draft, BIM, most task dialogs) are Python+PySide and cannot function without it. DELIVERABLES — do BOTH: 1) Write a thorough, concrete, ready-to-apply plan to /home/magik6k/lcad-wasm/porting/<SLUG>/plan.md — include: exact CMake flags/edits, exact source edits (file + before/after or unified-diff snippets precise enough to apply), any NEW files (full contents), external-dependency build recipes (how to build each dep for this emscripten/asyncify toolchain), a threading-hazard list (grep the real files, give file:line + the exact construct + the exact fix), a modal-dialog-hazard list, the PyImport_AppendInittab lines to add, an ordered step list, and an effort/risk estimate. Put any patch files or new-file contents as separate files in that dir too. 2) Return the structured summary (the schema). Keep summary fields concise; the depth goes in plan.md. Your returned text IS the structured object. Be exhaustive and correct — token cost is not a concern. Verify claims against the actual files (use grep/read). If a dependency has no known wasm port, say so plainly and estimate the porting effort. === YOUR SCOPE: Package the Draft workbench (Python + minimal C++) (slug: draft) === Draft is 242 py / 2 cpp. Produce: what the 2 C++ files are and whether they build on wasm; how the Python package gets into the wasm FS (the freecad.data packaging / python zip); its PySide dependency (hard requirement); any imports of unbuilt modules (Part is present; does it need Sketcher/others?). Give the packaging steps + inittab if any C++ module. Write your full plan + any patch/new-file contents under /home/magik6k/lcad-wasm/porting/draft/ (create the dir; plan.md is required). Then return the structured summary with deliverableFile=/home/magik6k/lcad-wasm/porting/draft/plan.md.
Fable
thinking
I'm diving into the FreeCAD source tree to understand how the Draft workbench is organized.
Fable
I'll start by exploring the Draft workbench structure and grounding everything in the real code.
Fable
⚙ Bash {"command": "git branch 2>/dev/null | head; echo \"---MOD DRAFT---\"; ls src/Mod/Draft 2>/dev/null; echo \"---CPP FILES---\"; find src/Mod/Draft -name '*.cpp' -o -name '*.h' -o -name '*.cc' | head -50", "description": "List Draft workbench …
tool result
  main
* wasm-port
---MOD DRAFT---
App
CMakeLists.txt
Draft.py
DraftGeomUtils.py
DraftGlobal.h
DraftGui.py
DraftTools.py
DraftVecUtils.py
DxfImportDialog.py
Init.py
InitGui.py
Resources
SVGPath.py
TestDraft.py
TestDraftGui.py
WorkingPlane.py
coding_conventions.md
draft.dox
draftfunctions
draftgeoutils
draftguitools
draftmake
draftobjects
drafttaskpanels
drafttests
draftutils
draftviewproviders
importAirfoilDAT.py
importDWG.py
importDXF.py
importOCA.py
importSVG.py
---CPP FILES---
src/Mod/Draft/D  …[truncated]
Fable
⚙ Bash {"command": "echo \"---CMakeLists top level---\"; cat src/Mod/Draft/CMakeLists.txt 2>/dev/null; echo \"===COUNT===\"; find src/Mod/Draft -name '*.py' | wc -l; find src/Mod/Draft \\( -name '*.cpp' -o -name '*.cc' \\) | wc -l", "description":…
tool result
---CMakeLists top level---
# SPDX-License-Identifier: LGPL-2.1-or-later

add_subdirectory(App)

IF (BUILD_GUI)
    PYSIDE_WRAP_RC(Draft_QRC_SRCS Resources/Draft.qrc)
ENDIF (BUILD_GUI)

SET(Draft_SRCS_base
    Init.py
    InitGui.py
    Draft.py
    DraftTools.py
    DraftGui.py
    DraftVecUtils.py
    DraftGeomUtils.py
    WorkingPlane.py
    TestDraft.py
    TestDraftGui.py
)

SET(Draft_import
    importAirfoilDAT.py
    importDXF.py
    DxfImportDialog.py
    importDWG.py
    importOCA.py
     …[truncated]
Fable
thinking
I need to examine the App C++ files and CMakeLists to understand what AppDraftUtils does.
Fable
Now let me examine the C++ App module and its CMakeLists.
Fable
⚙ Bash {"command": "cd src/Mod/Draft/App; echo \"===App CMakeLists===\"; cat CMakeLists.txt; echo \"===AppDraftUtils.cpp===\"; cat AppDraftUtils.cpp", "description": "Read Draft App CMakeLists and AppDraftUtils.cpp"}
tool result
===App CMakeLists===
# SPDX-License-Identifier: LGPL-2.1-or-later

if(MSVC)
    add_definitions(-D_CRT_SECURE_NO_WARNINGS)
endif(MSVC)


set(DraftUtils_LIBS
    Part
    FreeCADApp
)

SET(DraftUtils_SRCS
    AppDraftUtils.cpp
    AppDraftUtilsPy.cpp
    PreCompiled.h
)

add_library(DraftUtils SHARED ${DraftUtils_SRCS})

if(FREECAD_USE_PCH)
    target_precompile_headers(DraftUtils PRIVATE
            $<$<COMPILE_LANGUAGE:CXX>:"${CMAKE_CURRENT_LIST_DIR}/PreCompiled.h">
    )
endif(FREECAD_USE_PCH)  …[truncated]
Fable
⚙ Bash {"command": "cd src/Mod/Draft/App; echo \"===AppDraftUtilsPy.cpp===\"; cat AppDraftUtilsPy.cpp; echo \"===PreCompiled.h===\"; cat PreCompiled.h", "description": "Read AppDraftUtilsPy.cpp and PreCompiled.h"}
tool result
===AppDraftUtilsPy.cpp===
// SPDX-License-Identifier: LGPL-2.1-or-later

/***************************************************************************
 *   Copyright (c) 2015 Yorik van Havre <yorik@uncreated.net>              *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you ca  …[truncated]
Fable
thinking
The C++ side is straightforward—just a `DraftUtils` module with a single `readDXF` method that's essentially a stub printing a warning, and it loads the Part module, so it should compile to wasm without issues. Now I need to figure out how the wasm build registers modules through the inittab and how Part and Sketcher get set up.
Fable
Now let me understand the wasm build mechanics: the inittab files, how modules are registered statically, and the CMakeCache flags.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; echo \"===WasmInittab.cpp===\"; cat src/Main/WasmInittab.cpp 2>/dev/null | head -120; echo \"===WasmInittabGui.cpp===\"; cat src/Main/WasmInittabGui.cpp 2>/dev/null | head -80", …
tool result
===WasmInittab.cpp===
===WasmInittabGui.cpp===
Fable
⚙ Bash {"command": "cd /opt/toolchains/src/freecad-gui-build; grep -iE 'BUILD_DRAFT|BUILD_PART|BUILD_SKETCHER|BUILD_GUI|FC_OS_WASM|FREECAD_USE_PYSIDE|FREECAD_USE_SHIBOKEN|BUILD_MATERIAL|BUILD_START' CMakeCache.txt", "description": "Read relevant B…
tool result
BUILD_DRAFT:BOOL=OFF
BUILD_GUI:BOOL=ON
BUILD_MATERIAL:BOOL=ON
BUILD_MATERIAL_EXTERNAL:BOOL=OFF
BUILD_PART:BOOL=ON
BUILD_PART_DESIGN:BOOL=OFF
BUILD_SKETCHER:BOOL=ON
BUILD_START:BOOL=ON
FREECAD_USE_PYSIDE:BOOL=OFF
FREECAD_USE_SHIBOKEN:BOOL=OFF
Fable
thinking
I need to look in the build directory instead—those WasmInittab.cpp files are generated during the build process, not in the source tree.
Fable
The inittab files are generated. Let me find them in the build dir and understand the static module registration mechanism.
Fable
⚙ Bash {"command": "cd /opt/toolchains/src/freecad-gui-build; find . -iname 'WasmInittab*' 2>/dev/null; echo \"---in source---\"; cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; find . -iname 'WasmInittab*' 2>/dev/null; echo \"---grep inittab gen…
tool result
./src/Main/WasmInittabGui.cpp
./src/Main/WasmInittab.cpp
./src/Main/CMakeFiles/FreeCADMain.dir/WasmInittabGui.cpp.o
---in source---
---grep inittab generation---
CMakeLists.txt:95:    # registered via PyImport_AppendInittab (see src/Main wasm inittab).
src/Main/CMakeLists.txt:49:            string(APPEND _regs "    PyImport_AppendInittab(\"${_mod}\", PyInit_${_mod});\n")
src/Main/CMakeLists.txt:55:            "void freecadWasmRegisterInittab()\n"
src/Main/CMakeLists.txt:60:    freecad_wasm_gener  …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; sed -n '1,140p' src/Main/CMakeLists.txt", "description": "Read src/Main/CMakeLists.txt inittab generation"}
tool result
# SPDX-License-Identifier: LGPL-2.1-or-later

configure_file(freecad.rc.cmake ${CMAKE_CURRENT_BINARY_DIR}/freecad.rc)
configure_file(freecadCmd.rc.cmake ${CMAKE_CURRENT_BINARY_DIR}/freecadCmd.rc)
file(COPY icon.ico DESTINATION ${CMAKE_CURRENT_BINARY_DIR})


if(EMSCRIPTEN)
    # Python extension modules are linked statically into the executables and
    # must be registered on the interpreter's inittab before Py_Initialize().
    set(FREECAD_WASM_PY_MODULES "")
    set(FREECAD_WASM_PY_GUI_MODULES  …[truncated]
Fable
⚙ Bash {"command": "cd /opt/toolchains/src/freecad-gui-build; echo \"===WasmInittab.cpp===\"; cat src/Main/WasmInittab.cpp; echo; echo \"===WasmInittabGui.cpp===\"; cat src/Main/WasmInittabGui.cpp", "description": "Read generated inittab files"}
tool result
===WasmInittab.cpp===
// Generated by src/Main/CMakeLists.txt (wasm port)
#include <Python.h>
extern "C" PyObject* PyInit_Part();
extern "C" PyObject* PyInit_Sketcher();
extern "C" PyObject* PyInit_Materials();
void freecadWasmRegisterInittab()
{
    PyImport_AppendInittab("Part", PyInit_Part);
    PyImport_AppendInittab("Sketcher", PyInit_Sketcher);
    PyImport_AppendInittab("Materials", PyInit_Materials);
}

===WasmInittabGui.cpp===
// Generated by src/Main/CMakeLists.txt (wasm port)
#include  …[truncated]
Fable
thinking
I'm realizing that DraftUtils uses the Python module initialization macro which expands to `PyInit_DraftUtils`, but on WebAssembly it's built as a static library rather than shared, so I need to check how the Part App's CMake configuration handles this scenario.

Let me trace through how the module gets loaded: the PyMOD_INIT_FUNC macro, how SET_PYTHON_PREFIX_SUFFIX behaves on Emscripten, whether Draft.py can actually import DraftUtils, and crucially, how the Python files from the Mod directory get packaged into the WebAssembly filesystem in the first place.
Fable
Now let me understand how modules build as static on wasm, the PyMOD macro, how DraftUtils is imported, and how Python Mod files get into the wasm FS.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; echo \"===PyMOD_INIT_FUNC macro===\"; grep -rn \"define PyMOD_INIT_FUNC\\|define PyMOD_Return\\|PyMOD_INIT_FUNC\" src/Base/PyObjectBase.h src/FCConfig.h 2>/dev/null | head; echo;…
tool result
===PyMOD_INIT_FUNC macro===
src/Base/PyObjectBase.h:67:#define PyMOD_INIT_FUNC(name) PyMODINIT_FUNC PyInit_##name(void)
src/Base/PyObjectBase.h:68:#define PyMOD_Return(name) return name

===SET_PYTHON_PREFIX_SUFFIX / SHARED handling on wasm===
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; echo \"===how add_library SHARED becomes static on wasm===\"; grep -rn \"CMAKE_INSTALL_LIBDIR\\|BUILD_SHARED_LIBS\\|add_library\" src/Mod/Part/App/CMakeLists.txt | head; echo \"=…
tool result
===how add_library SHARED becomes static on wasm===
src/Mod/Part/App/CMakeLists.txt:3:add_library(Part SHARED)
src/Mod/Part/App/CMakeLists.txt:650:INSTALL(TARGETS Part DESTINATION ${CMAKE_INSTALL_LIBDIR})
===global override?===
CMakeLists.txt:91:if(EMSCRIPTEN)
CMakeLists.txt:92:    # WebAssembly port: dynamic linking is not used; every SHARED/MODULE target
CMakeLists.txt:102:            list(TRANSFORM _args REPLACE "^(SHARED|MODULE)$" "STATIC")
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; sed -n '88,130p' CMakeLists.txt", "description": "Read the SHARED->STATIC override block"}
tool result
        FREECAD_USE_SANITIZER_MSAN
)

if(EMSCRIPTEN)
    # WebAssembly port: dynamic linking is not used; every SHARED/MODULE target
    # (core libs and Python extension modules alike) becomes a static archive
    # linked into the single executable. Python extension modules are then
    # registered via PyImport_AppendInittab (see src/Main wasm inittab).
    function(add_library name)
        set(_args ${ARGN})
        list(FIND _args IMPORTED _imp)
        list(FIND _args INTERFACE _ifc)
      …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; echo \"===How Draft imports DraftUtils===\"; grep -rn \"DraftUtils\\|import Part\\|from Part\\|import Sketcher\\|import Arch\\|import Mesh\\|import Points\" Draft.py 2>/dev/null …
tool result
===How Draft imports DraftUtils===
---search whole tree for DraftUtils usage---
src/Mod/Draft/DraftGlobal.h
src/Mod/Draft/App/CMakeLists.txt
src/Mod/Draft/App/AppDraftUtils.cpp
src/Mod/Draft/App/AppDraftUtilsPy.cpp
Fable
thinking
DraftUtils is only referenced in the C++ files and build configuration, never actually imported by the Python code—it's essentially a stub module with a deprecated readDXF function that does nothing. Let me verify that DraftUtils isn't imported anywhere else in the codebase.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; echo \"=== Any Python import of DraftUtils anywhere? ===\"; grep -rln \"DraftUtils\" src/ | grep -v \"src/Mod/Draft/App\\|DraftGlobal.h\"; echo \"=== import Draft (the C++ named …
tool result
=== Any Python import of DraftUtils anywhere? ===
=== import Draft (the C++ named module?) — is there a Python module registered? ===
--- DraftGlobal.h ---
// SPDX-License-Identifier: LGPL-2.1-or-later

/***************************************************************************
 *   Copyright (c) 2021 Werner Mayer <wmayer[at]users.sourceforge.net>     *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.       …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; echo \"=== Modules imported by Draft Python (top imports) ===\"; grep -rhoE \"^(import|from) [A-Za-z0-9_.]+\" src/Mod/Draft/*.py src/Mod/Draft/draft*/*.py 2>/dev/null | grep -vE …
tool result
=== Modules imported by Draft Python (top imports) ===
    213 from draftutils
    177 import FreeCAD
    100 from draftutils.translate
    100 from draftutils.messages
     89 from PySide.QtCore
     82 import FreeCADGui
     80 from draftguitools
     64 import DraftVecUtils
     60 from draftgeoutils
     50 import math
     34 from draftmake
     33 import Draft_rc
     28 from FreeCAD
     26 import lazy_loader.lazy_loader
     26 from drafttests
     25 from PySide
     21 import os
     2  …[truncated]
Fable
thinking
Looking at the dependency analysis, the C++ `DraftUtils` module is never actually used by Python code despite existing in the codebase, making it essentially dead weight—though it's cheap to build anyway. The real dependencies for Draft are concentrated in `PySide` (which accounts for the vast majority of references), `pivy.coin` for 3D geometry, along with `FreeCADGui`, `Part`, `lazy_loader`, and the compiled resource module `Draft_rc`.

Now I need to check whether Draft actually depends on other FreeCAD modules like Sketcher, Mesh, Points, or TechDraw by searching for their imports across the codebase. I should also verify how `Draft_rc` works—it's generated from the Qt resource file and l  …
Fable
Let me check which other FreeCAD C++/workbench modules Draft imports (Sketcher, Arch, Mesh, etc.) and the pivy/lazy_loader/Draft_rc situation.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Draft; echo \"=== imports of other FreeCAD modules (C++ workbenches) ===\"; grep -rhoE \"(^|[^a-zA-Z._])(import|from) (Part|PartGui|Sketcher|SketcherGui|Arch|ArchGui|Mesh|…
tool result
=== imports of other FreeCAD modules (C++ workbenches) ===
      4 PartGui
      1 Sketcher
      1 Part
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Draft; echo \"=== Import module usage (DXF etc) ===\"; grep -rn \"import Import\\b\\|Import.read\\|Import.export\\|importDWG\\|import Arch\" *.py import*.py | head -20; ec…
tool result
=== Import module usage (DXF etc) ===
importDWG.py:4:## @package importDWG
importDWG.py:8:@package importDWG
Init.py:37:App.addImportType("Autodesk DWG 2D (*.dwg *.DWG)", "importDWG")
Init.py:38:App.addExportType("Autodesk DWG 2D (*.dwg)", "importDWG")
importDWG.py:4:## @package importDWG
importDWG.py:8:@package importDWG
importDXF.py:151:        import ArchCommands
importDXF.py:2915:            import Import
importDXF.py:2917:            stats = Import.readDXF(filename)
importDXF.py:3734:        …[truncated]
Fable
thinking
I need to refine my grep search since the initial pattern was too narrow. Looking at the imports more carefully, I found Part, Sketcher, and PartGui references, with "import Part" appearing 12 times. Now I'm checking the critical dependency: pivy.coin, which isn't available in the toolchains—this is the Python binding to Coin3D that Draft relies on in version 9 and later.

I'm also noting that pivy appears in 6 places as a hard GUI dependency for view providers and trackers, requiring shiboken/SWIG bindings to Coin3D, which is a significant blocker. Meanwhile, lazy_loader is present in the 3rdParty build, Draft_rc is a generated resource needing rcc compilation, and PySide is a hard requirem  …
Fable
Let me get the complete import picture and verify pivy availability (critical for view providers/trackers).
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Draft; echo \"=== ALL top-level FreeCAD-ish + third-party imports (unique) ===\"; grep -rhoE \"(^[[:space:]]*)(import|from)[[:space:]]+[A-Za-z_][A-Za-z0-9_.]*\" . 2>/dev/n…
tool result
=== ALL top-level FreeCAD-ish + third-party imports (unique) ===
    207 FreeCAD
    112 the
    107 PySide.QtCore
    102 FreeCADGui
     74 Part
     68 menu
     50 math
     44 PySide
     27 os
     26 lazy_loader.lazy_loader
     15 PySide.QtGui
     11 pivy
     10 pivy.coin
      9 re
      8 PySide.QtWidgets
      7 sys
      6 unittest
      5 tempfile
      4 json
      4 TechDraw
      4 PartGui
      3 xml.etree.ElementTree
      3 traceback
      3 platform
      3 an
      3 Arch
  …[truncated]
Fable
⚙ Bash {"command": "echo \"=== pivy anywhere in toolchains/site-packages? ===\"; find /opt/toolchains -iname \"pivy\" -type d 2>/dev/null; find /opt/toolchains -path \"*pivy*coin*\" 2>/dev/null | head; echo \"--- search build for pivy target ---\"…
tool result
=== pivy anywhere in toolchains/site-packages? ===
--- search build for pivy target ---
cMake/FreeCAD_Helpers/PrintFinalReport.cmake
cMake/FreeCAD_Helpers/FreeCADLibpackChecks.cmake
cMake/FreeCAD_Helpers/InitializeFreeCADBuildOptions.cmake
cMake/FreeCAD_Helpers/SetupCoin3D.cmake
cMake/FreeCAD_Helpers/SetupSwig.cmake
=== Coin3D / Quarter present? ===
/opt/toolchains/src/freecad-gui-build/lib/libCoin.a
/opt/toolchains/include/boost/units/base_units/imperial/quarter.hpp
/opt/toolchains/src/freecad-  …[truncated]
Fable
thinking
So pivy is completely missing from the toolchains—Coin3D itself is baked into the GUI as a static library, but the Python bindings that Draft needs for its view providers, trackers, snapper, and grid are nowhere to be found. That's why the GUI Draft breaks immediately. And PySide is massive across the dependencies.

The soft imports in TechDraw, Arch, and Import modules are deferred into functions, so they're not blocking at load time. Now I need to trace through Init.py and InitGui.py to see what actually runs when the workbench registers, then figure out how the Python Mod files get packaged into the WebAssembly filesystem—whether that's through preload directives or a Python zip archive.
Fable
pivy is confirmed ABSENT. Let me check Init.py/InitGui.py load-time deps and how the Mod Python tree is packaged into the wasm FS.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Draft; echo \"=== Init.py imports ===\"; grep -nE \"^\\s*(import|from)|FreeCAD\\.\" Init.py | head -40; echo \"=== InitGui.py structure (class + imports) ===\"; grep -nE \…
tool result
=== Init.py imports ===
25:import FreeCAD as App
27:translate = FreeCAD.Qt.translate
=== InitGui.py structure (class + imports) ===
25:import os
27:import FreeCAD
28:import FreeCADGui
35:class DraftWorkbench(FreeCADGui.Workbench):
44:        self.__class__.Icon = os.path.join(__dirname__, "Resources", "icons", "DraftWorkbench.svg")
45:        self.__class__.MenuText = QT_TRANSLATE_NOOP("draft", "Draft")
48:    def Initialize(self):
57:            from pivy import coin
86:            import Draft  …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; echo \"=== How is Mod python tree packaged into wasm FS? search for preload / packaging ===\"; grep -rln \"preload-file\\|--embed-file\\|python-zip\\|Mod/Part\\|packLibrary\\|pac…
tool result
=== How is Mod python tree packaged into wasm FS? search for preload / packaging ===
--- look for wasm packaging scripts ---
/home/magik6k/lcad-wasm/check-deploy.sh
/home/magik6k/lcad-wasm/package.json
/home/magik6k/lcad-wasm/package-lock.json
/home/magik6k/lcad-wasm/LibreCAD/CLEAN.SH
/home/magik6k/lcad-wasm/node_modules/.package-lock.json
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/package
/home/magik6k/lcad-wasm/freecad-port/toolchain/assemble-python-prefix.sh
/home/magik6k/lcad-wasm/freecad-  …[truncated]
Fable
thinking
I'm checking how the workbench initializes pivy at startup — specifically looking at whether the import in InitGui.py is wrapped in error handling, since a missing pivy dependency would prevent the entire workbench from loading. Now I need to understand how existing modules like Part and Sketcher get packaged into the WebAssembly filesystem, so I'm examining the deployment scripts and package structure.
Fable
Let me examine how existing Mod Python trees reach the wasm FS and the pivy import context in InitGui.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; echo \"=== package dir ===\"; ls -la package/ 2>/dev/null | head; echo \"=== check-deploy.sh ===\"; cat /home/magik6k/lcad-wasm/check-deploy.sh 2>/dev/null | head -80", "descript…
tool result
=== package dir ===
total 0
drwxr-xr-x 1 agent agent  96 Jul  3 17:58 .
drwxr-xr-x 1 agent agent 616 Jul  3 18:27 ..
drwxr-xr-x 1 agent agent 298 Jul  3 17:58 WindowsInstaller
drwxr-xr-x 1 agent agent  34 Jul  3 17:58 fedora
drwxr-xr-x 1 agent agent 182 Jul  3 17:58 rattler-build
drwxr-xr-x 1 agent agent  96 Jul  3 17:58 scripts
drwxr-xr-x 1 agent agent  46 Jul  3 17:58 ubuntu
=== check-deploy.sh ===
#!/usr/bin/env bash
# check-deploy.sh — verify the live site matches the local ./deploy folder.
  …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; sed -n '48,100p' src/Mod/Draft/InitGui.py", "description": "Read InitGui Initialize method"}
tool result
    def Initialize(self):
        """When the workbench is first loaded."""

        def QT_TRANSLATE_NOOP(context, text):
            return text

        # Run self-tests
        dependencies_OK = False
        try:
            from pivy import coin

            if FreeCADGui.getSoDBVersion() != coin.SoDB.getVersion():
                raise AssertionError(
                    "FreeCAD and Pivy use different versions "
                    "of Coin. "
                    "This will lead to unexp  …[truncated]
Fable
thinking
So InitGui.py has a hard dependency on pivy — if it's not available, the entire workbench initialization fails and returns early, which means the GUI tools won't load at all. This is a critical blocker for getting the FreeCAD GUI working in WebAssembly. Now I need to figure out how the Python modules are being packaged into the WebAssembly filesystem and where the existing Part workbench files are deployed so I can understand the build process.
Fable
Let me find how the deploy/data files are built and whether Part's Python Mod files are already bundled (the packaging mechanism).
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm; ls -la freecad-port/*deploy* freecad-port/FreeCAD/deploy 2>/dev/null; find . -maxdepth 4 -name \"*.data\" 2>/dev/null | grep -i freecad | head; echo \"=== find FreeCAD.wasm / .data build outputs ===\…
tool result
freecad-port/deploy:
total 275080
drwxr-xr-x 1 agent agent       312 Jul  5 01:29 .
drwxr-xr-x 1 agent agent       636 Jul  4 20:50 ..
-rw-r--r-- 1 agent agent    531487 Jul  5 01:26 FreeCAD.js
-rw-r--r-- 1 agent agent     98929 Jul  5 01:27 FreeCAD.js.gz
-rwxr-xr-x 1 agent agent 188407835 Jul  5 01:26 FreeCAD.wasm
-rwxr-xr-x 1 agent agent  68143106 Jul  5 01:27 FreeCAD.wasm.gz
-rw-r--r-- 1 agent agent      1613 Jul  4 20:38 README.md
-rw-r--r-- 1 agent agent      1206 Jul  5 01:24 boot.py
-rw-r  …[truncated]
Fable
thinking
I need to trace how freecad.data gets built from the file_packager output and find the script responsible for generating it along with boot.py, then examine how the Mod directories are being packaged into it.
Fable
The `freecad.data` is a file_packager bundle. Let me find how it's generated and what Mod dirs it contains.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port; echo \"=== find packaging script for freecad.data ===\"; grep -rln \"file_packager\\|freecad.data\\|--preload\" . --include=*.sh --include=*.mjs --include=*.js --include=*.py 2>/dev/null…
tool result
=== find packaging script for freecad.data ===
deploy-gui/FreeCAD.js
deploy-t1/FreeCADCmd.js
deploy-jspi/FreeCAD.js
deploy-t1/test-memfs.js
deploy-gui/freecad.data.js
deploy-t1/freecad.data.js
deploy-jspi/freecad.data.js
=== what's inside freecad.data.js (paths) ===
"/freecad/Mod/Material
"/freecad/Mod/Material"
"/freecad/Mod/Part
"/freecad/Mod/Part"
"/freecad/Mod/Sketcher
"/freecad/Mod/Sketcher"
"/freecad/Mod/Start
"/freecad/Mod/pivy
"/freecad/Mod/pivy"
"/freecad/share/Mod/Material
"/freecad/sh  …[truncated]
Fable
thinking
So pivy is actually bundled in the FreeCAD data directory, just not where I was searching for it. Let me dig into what's actually in that pivy folder and cross-reference it with the freecad.data.js file to understand the structure better.
Fable
Interesting — there IS a `/freecad/Mod/pivy` in the bundle. Let me inspect what pivy contains and how the packaging is driven.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port; echo \"=== pivy paths in bundle ===\"; grep -oE '\"/freecad/Mod/pivy[^\"]*\"' deploy/freecad.data.js | head -30; echo \"=== find the actual pivy source dir on disk ===\"; find /opt/toolc…
tool result
=== pivy paths in bundle ===
"/freecad/Mod/pivy"
"/freecad/Mod/pivy"
"/freecad/Mod/pivy"
"/freecad/Mod/pivy/qt"
"/freecad/Mod/pivy/qt"
"/freecad/Mod/pivy/qt"
"/freecad/Mod/pivy/qt"
"/freecad/Mod/pivy"
"/freecad/Mod/pivy/quarter"
"/freecad/Mod/pivy/quarter"
"/freecad/Mod/pivy/quarter"
"/freecad/Mod/pivy/quarter/plugins"
"/freecad/Mod/pivy/quarter/plugins/designer"
"/freecad/Mod/pivy/__init__.py"
"/freecad/Mod/pivy/_coin.pyi"
"/freecad/Mod/pivy/coin.py"
"/freecad/Mod/pivy/coin.pyi"
"/freecad/Mod/p  …[truncated]
Fable
thinking
I need to figure out whether the native `_coin` C extension module actually exists in the bundle. The pivy package imports it as a SWIG binding, and while there's a type stub file present, I'm not sure if the actual compiled module is built or registered in the initialization table.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port; echo \"=== is native _coin built / in inittab? ===\"; grep -rn \"_coin\\|PyInit__coin\\|pivy\" /opt/toolchains/src/freecad-gui-build/src/Main/WasmInittab*.cpp 2>/dev/null; grep -roE \"Py…
tool result
=== is native _coin built / in inittab? ===
=== find pivy source tree on disk (where packaged from) ===
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/3rdParty/pivy
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/3rdParty/pivy; echo \"=== pivy dir contents ===\"; ls -la; echo \"=== __init__.py head ===\"; head -40 __init__.py 2>/dev/null; echo \"=== coin.py head (how _coin imported) ==…
tool result
=== pivy dir contents ===
total 424
drwxr-xr-x 1 agent agent    670 Jul  3 17:58 .
drwxr-xr-x 1 agent agent    312 Jul  3 17:58 ..
-rw-r--r-- 1 agent agent   6148 Jul  3 17:58 .DS_Store
-rw-r--r-- 1 agent agent     48 Jul  3 17:58 .git
-rw-r--r-- 1 agent agent     86 Jul  3 17:58 .gitattributes
drwxr-xr-x 1 agent agent     18 Jul  3 17:58 .github
-rw-r--r-- 1 agent agent    246 Jul  3 17:58 .gitignore
drwxr-xr-x 1 agent agent     76 Jul  3 17:58 .vscode
-rw-r--r-- 1 agent agent    107 Jul  3 17:  …[truncated]
Fable
thinking
The pivy Python module is included in the bundle, but it's essentially non-functional because the critical `_coin` SWIG extension—which provides the C++ bindings to Coin3D/Inventor—was never built. Without that native binding, the packaged pivy code can't actually do anything.

However, there's a bigger blocker: Draft's GUI components rely heavily on PySide (QtCore, QtGui, QtWidgets), and PySide isn't available in this wasm build. So even if I could get pivy working, the GUI-heavy parts of Draft wouldn't function anyway.

The practical path forward is simpler: the two C++ utility files compile trivially since they only depend on Base and Part modules that are already present. For the Python   …
Fable
pivy native `_coin` is NOT built (only Python packaged). Let me verify whether headless `import Draft` / make functions are usable without GUI (PySide-free path).
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Draft; echo \"=== Draft.py imports ===\"; grep -nE \"^\\s*(import|from)\" Draft.py | head -40; echo; echo \"=== does draftmake/make_line import PySide/gui at module level?…
tool result
=== Draft.py imports ===
37:import FreeCAD as App
40:    import Draft_rc
57:from draftutils.utils import ARROW_TYPES as arrowtypes
59:from draftutils.utils import type_check, typecheck, precision, tolerance
61:from draftutils.utils import (
80:from draftutils.utils import (
94:from draftfunctions.svg import get_svg, getSVG
96:from draftfunctions.dxf import get_dxf, getDXF
98:from draftutils.gui_utils import (
120:from draftutils.gui_utils import dim_symbol, dimSymbol, dim_dash, dimDash
122:from   …[truncated]
Fable
thinking
I'm checking whether Draft.py's unconditional import of view_base at line 175 triggers any GUI dependencies like pivy or PySide at module load time. The make_circle function does guard its view_base import with `App.GuiUp`, but that doesn't help if Draft.py itself imports it unconditionally earlier, so I need to trace through what view_base and gui_utils actually load.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Draft; echo \"=== view_base.py module-level imports ===\"; grep -nE \"^\\s*(import|from)\" draftviewproviders/view_base.py | head; echo \"=== gui_utils.py module-level imp…
tool result
=== view_base.py module-level imports ===
36:import PySide.QtCore as QtCore
37:import PySide.QtGui as QtGui
38:from PySide.QtCore import QT_TRANSLATE_NOOP
40:import FreeCAD as App
41:from draftutils import gui_utils
42:from draftutils import params
43:from draftutils import utils
44:from draftutils.translate import translate
47:    from pivy import coin
48:    import FreeCADGui as Gui
=== gui_utils.py module-level imports ===
42:import importlib
43:import math
44:import os
46:import FreeCAD as A  …[truncated]
Fable
thinking
I'm spotting a critical issue: `view_base.py` unconditionally imports PySide at the module level, and since Draft.py imports view_base at the top level, any attempt to import Draft will fail with an ImportError even in headless mode. The PySide imports aren't protected by a GuiUp check, though I need to verify whether the pivy import on line 47 is actually guarded.

Since PySide isn't available in the WASM environment, this blocks Draft entirely. The core issue is that PySide.QtCore is used for translation utilities and Qt classes in view providers, which are only needed when the GUI is active. Wrapping these behind GuiUp checks would require invasive patching across multiple files, especial  …
Fable
view_base imports PySide UNCONDITIONALLY and Draft.py imports view_base at module level — so even headless `import Draft` breaks on PySide. Let me confirm the most-imported core utils (translate, params, utils) and their PySide coupling.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Draft; for f in draftutils/translate.py draftutils/messages.py draftutils/params.py draftutils/utils.py; do echo \"=== $f ===\"; grep -nE \"^\\s*(import|from) (PySide|pivy…
tool result
=== draftutils/translate.py ===
38:import PySide.QtCore as QtCore
39:import PySide.QtWidgets as QtWidgets
=== draftutils/messages.py ===
=== draftutils/params.py ===
27:import PySide.QtCore as QtCore
41:    import FreeCADGui as Gui
42:    from PySide import QtWidgets
403:        from PySide import QtGui
=== draftutils/utils.py ===
42:import PySide.QtCore as QtCore
54:    import FreeCADGui as Gui
169:        from pivy import coin
=== confirm PySide import fails in wasm python ===
/opt/toolchains/  …[truncated]
Fable
thinking
I'm seeing that several foundational modules in the Draft utilities have hard dependencies on PySide at the module level—`translate.py` imports it unconditionally and is used extensively throughout the codebase, while `utils.py` and `params.py` do the same, creating tight coupling that would need to be addressed for any GUI abstraction.

Since `Draft.py` itself imports these modules at the top level, the entire library fails to import without PySide available, making it impossible to use Draft in a headless context. The real blockers are porting PySide and shiboken to WebAssembly (a massive undertaking involving Clang-based binding generation and runtime compilation) plus getting pivy's nati  …
Fable
PySide coupling is confirmed pervasive at the deepest util level. Let me confirm the file_packager driver and the Sketcher/make_sketch dependency, then I have enough.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm; echo \"=== find the script that builds freecad.data (file_packager driver) ===\"; grep -rln \"file_packager\\|freecad.data\\|--preload\\|/freecad/Mod\" freecad-port/ --include=*.sh --include=*.py --i…
tool result
=== find the script that builds freecad.data (file_packager driver) ===
=== toolchain dir scripts ===
__pycache__
assemble-python-prefix.sh
configure-stage1.sh
configure-stage2.sh
patches
run-freecadcmd.js
t1-smoke.py
versions.lock
=== make_sketch imports ===
90:    import Part
91:    from Sketcher import Constraint
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm; echo \"=== search entire lcad-wasm for file_packager usage & data build ===\"; grep -rln \"file_packager\\|preload-file\\|/freecad/Mod\\|freecad.data\" . --include=*.sh --include=*.py --include=*.mjs…
tool result
=== search entire lcad-wasm for file_packager usage & data build ===
deploy/librecad.js
deploy-debug/librecad.js
=== any Makefile/justfile/README describing packaging ===
=== how many make_sketch-like modules import Sketcher/other C++ ===
draftguitools/gui_trackers.py
draftmake/make_sketch.py
Fable
thinking
The file_packager tool from emscripten generates the freecad.data bundle, and since the repo already packages several Mod directories like Part, Sketcher, and Material, I just need to add Draft to that same packaged set following the established convention. Now I'm looking at boot.py to see how the Mod directories are loaded during startup.
Fable
Let me check boot.py and how Mod dirs are discovered/registered, to complete the packaging picture.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/deploy; echo \"=== boot.py ===\"; cat boot.py; echo \"=== Mod path setup / workbench discovery in FreeCAD ===\"; cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; grep -rn \"Mod\\b\" src/A…
tool result
=== boot.py ===
import FreeCAD as App, FreeCADGui as Gui, Part, PartGui

# Suppress non-intrusive notification toasts (they cover the viewport on wasm,
# e.g. "Unknown command" for a few unregistered toolbar extras).
try:
    App.ParamGet("User parameter:BaseApp/Preferences/NotificationArea").SetBool("NonIntrusiveNotificationsEnabled", False)
except Exception as e:
    App.Console.PrintMessage("notif err " + str(e) + "\n")

# Demo document: a Box with a cylindrical cut.
d = App.newDocument("Demo  …[truncated]
Fable
thinking
Now I understand the full picture—FreeCAD discovers modules in the Mod directories and automatically runs their Init.py at startup for application-level setup and InitGui.py for GUI registration. The InitGui.Initialize() method can gracefully disable itself if dependencies like pivy aren't available. With this grounded understanding, I'm ready to write out the plan and provide the structured summary.
Fable
I have a complete, grounded picture. Let me write the plan and supporting files.
Fable
⚙ Bash {"command": "mkdir -p /home/magik6k/lcad-wasm/porting/draft; echo created", "description": "Create porting dir"}
tool result
created
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Draft; echo \"=== confirm which modules import PySide at top-level (module scope, unguarded) among the CORE chain pulled by Draft.py ===\"; for f in draftutils/utils.py dr…
tool result
=== confirm which modules import PySide at top-level (module scope, unguarded) among the CORE chain pulled by Draft.py ===
draftutils/utils.py : top-level-PySide=1
draftutils/translate.py : top-level-PySide=2
draftutils/params.py : top-level-PySide=1
draftutils/gui_utils.py : top-level-PySide=0
draftutils/groups.py : top-level-PySide=0
draftfunctions/svg.py : top-level-PySide=0
draftfunctions/dxf.py : top-level-PySide=0
draftobjects/base.py : top-level-PySide=0
draftviewproviders/view_base.py :   …[truncated]
Fable
thinking
So the import chain is clear: Draft.py depends on draftutils.utils at the top level, and that's where PySide is blocking everything. Now I'm putting together the plan document and a patch to handle the optional C++ inittab registration along with enabling the BUILD_DRAFT flag in CMake.
Fable
All confirmed. Now writing the deliverables.
Fable
⚙ Write {"file_path": "/home/magik6k/lcad-wasm/porting/draft/plan.md", "content": "# Draft Workbench → FreeCAD-WASM Port Plan\n\n**Slug:** `draft`\n**Scope:** Package the Draft workbench (242 Python files + 2 C++ files) into the single-threaded\nAS…
tool result
File created successfully at: /home/magik6k/lcad-wasm/porting/draft/plan.md (file state is current in your context — no need to Read it back)
Fable
Now the optional patch file for the C++ inittab registration.
Fable
⚙ Write {"file_path": "/home/magik6k/lcad-wasm/porting/draft/0001-optional-draftutils-inittab.patch", "content": "--- a/src/Main/CMakeLists.txt\n+++ b/src/Main/CMakeLists.txt\n@@ -20,6 +20,11 @@ if(EMSCRIPTEN)\n if(BUILD_PART_DESIGN)\n …
tool result
File created successfully at: /home/magik6k/lcad-wasm/porting/draft/0001-optional-draftutils-inittab.patch (file state is current in your context — no need to Read it back)
Fable
thinking
I'm putting together the final summary now.
Fable
Deliverables written to `/home/magik6k/lcad-wasm/porting/draft/` (plan.md + optional inittab patch). Returning the structured summary.
Fable
⚙ StructuredOutput {"slug": "draft", "title": "Draft workbench (Python + minimal C++) wasm packaging", "feasibility": "needs-dep-port", "oneLineVerdict": "The 2 C++ files build fine and all 242 .py package trivially, but Draft is unusable (even headless impor…
tool result
Structured output provided successfully