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: Show, Plot, OpenSCAD, Assembly, Inspection (slug: small-python-mods) === For EACH of Show (0cpp/15py — referenced by Sketcher/others, currently missing -> "No module named Show"), Plot (matplotlib?), OpenSCAD (21py), Assembly, Inspection (7cpp/2py): give the deps, PySide requirement, cmake/packaging, inittab, and effort. Prioritize Show (small, unblocks Sketcher visibility automation). Keep each clearly separated. Write your full plan + any patch/new-file contents under /home/magik6k/lcad-wasm/porting/small-python-mods/ (create the dir; plan.md is required). Then return the structured summary with deliverableFile=/home/magik6k/lcad-wasm/porting/small-python-mods/plan.md.
Fable
thinking
I'm starting by exploring the source tree to understand the key modules—Show, Plot, OpenSCAD, Assembly, and Inspection—and then examining the module directories and build configuration.
Fable
I'll investigate the real code for each module. Let me start by exploring the module structure and build config.
Fable
⚙ Bash {"command": "ls src/Mod/ && echo \"---SHOW---\" && ls -R src/Mod/Show 2>/dev/null | head -50 && echo \"---PLOT---\" && ls src/Mod/Plot 2>/dev/null | head && echo \"---OPENSCAD---\" && ls src/Mod/OpenSCAD 2>/dev/null | head -40", "descriptio…
tool result
AddonManager
Assembly
BIM
CAM
CMakeLists.txt
Draft
Fem
Help
Import
Inspection
JtReader
Material
Measure
Mesh
MeshPart
OpenSCAD
Part
PartDesign
Plot
Points
ReverseEngineering
Robot
Show
Sketcher
Spreadsheet
Start
Surface
TechDraw
TemplatePyMod
Test
Tux
Web
__init__.py
mod.dox
---SHOW---
src/Mod/Show:
CMakeLists.txt
Containers.py
DepGraphTools.py
SceneDetail.py
SceneDetails
ShowUtils.py
TVObserver.py
TVStack.py
__init__.py
mTempoVis.py

src/Mod/Show/SceneDetails:
Camera.py
ClipPlane.py
ObjectClipP  …[truncated]
Fable
⚙ Bash {"command": "echo \"---ASSEMBLY---\" && ls src/Mod/Assembly 2>/dev/null | head -40 && echo \"---INSPECTION---\" && ls src/Mod/Inspection 2>/dev/null | head -40 && echo \"===INSPECTION APP===\" && ls src/Mod/Inspection/App 2>/dev/null", "des…
tool result
---ASSEMBLY---
App
Assembly
AssemblyGlobal.h
AssemblyImport.py
AssemblyTests
CMakeLists.txt
CommandCreateAssembly.py
CommandCreateBom.py
CommandCreateJoint.py
CommandCreateSimulation.py
CommandCreateView.py
CommandExportASMT.py
CommandInsertLink.py
CommandInsertNewPart.py
CommandSolveAssembly.py
Gui
Init.py
InitGui.py
JointObject.py
Preferences.py
SoSwitchMarker.py
TestAssemblyWorkbench.py
UtilsAssembly.py
assembly.dox
---INSPECTION---
App
CMakeLists.txt
Gui
Init.py
InitGui.py
Inspection.dox
Ins  …[truncated]
Fable
⚙ Bash {"command": "grep -nE \"BUILD_(SHOW|PLOT|OPENSCAD|ASSEMBLY|INSPECTION|PART|SKETCHER|MATERIAL|START)\" /opt/toolchains/src/freecad-gui-build/CMakeCache.txt 2>/dev/null", "description": "Check build flags for target modules"}
tool result
21:BUILD_ASSEMBLY:BOOL=OFF
64:BUILD_INSPECTION:BOOL=OFF
70:BUILD_MATERIAL:BOOL=ON
73:BUILD_MATERIAL_EXTERNAL:BOOL=OFF
85:BUILD_OPENSCAD:BOOL=OFF
88:BUILD_PART:BOOL=ON
91:BUILD_PART_DESIGN:BOOL=OFF
94:BUILD_PLOT:BOOL=OFF
109:BUILD_SHOW:BOOL=OFF
112:BUILD_SKETCHER:BOOL=ON
118:BUILD_START:BOOL=ON
Fable
thinking
I'm starting by looking at the Show module's CMakeLists and its dependencies since that's the priority.
Fable
Let me examine each module's CMakeLists and Python dependencies.
Fable
⚙ Bash {"command": "cd src/Mod/Show && echo \"===SHOW CMakeLists===\" && cat CMakeLists.txt && echo \"===SHOW __init__===\" && cat __init__.py | head -40", "description": "Read Show CMakeLists and init"}
tool result
===SHOW CMakeLists===
# SPDX-License-Identifier: LGPL-2.1-or-later

SET(Show_SRCS
    __init__.py
    Containers.py
    DepGraphTools.py
    SceneDetail.py
    mTempoVis.py
    TVObserver.py
    TVStack.py
    ShowUtils.py
)

SET(Show_SceneDetails_SRCS
    SceneDetails/__init__.py
    SceneDetails/Camera.py
    SceneDetails/ClipPlane.py
    SceneDetails/ObjectClipPlane.py
    SceneDetails/Pickability.py
    SceneDetails/VProperty.py
    SceneDetails/Workbench.py
)

SET(Show_All_SRCS
    ${Show_S  …[truncated]
Fable
⚙ Bash {"command": "cd src/Mod/Show && echo \"===IMPORTS in Show py files===\" && grep -rnE \"^\\s*(import|from)\\s\" *.py SceneDetails/*.py | grep -viE \"from __future__\" | sort -u", "description": "Find all imports in Show module"}
tool result
===IMPORTS in Show py files===
SceneDetails/Camera.py:25:from Show.SceneDetail import SceneDetail
SceneDetails/Camera.py:27:import FreeCADGui
SceneDetails/ClipPlane.py:25:from Show.SceneDetail import SceneDetail
SceneDetails/ClipPlane.py:26:import FreeCAD as App
SceneDetails/ClipPlane.py:27:import FreeCADGui as Gui
SceneDetails/ObjectClipPlane.py:114:        from Show import TempoVis
SceneDetails/ObjectClipPlane.py:25:from Show.SceneDetail import SceneDetail
SceneDetails/ObjectClipPlane.py:27:im  …[truncated]
Fable
thinking
Looking at the Show module, it's a pure Python custom target that just copies sources without any CMake gating I can see. I need to check how BUILD_SHOW is actually gated in the parent CMakeLists file. Show depends on FreeCAD, FreeCADGui, and pivy.coin along with standard library modules like weakref, copy, sys, and traceback—pivy is conditionally imported inside the code.

The real issue is that Show needs to be registered so `import Show` works, and since it's pure Python with no compiled dependencies, it needs to be on the Python path. I'm trying to figure out how pure Python modules get bundled into the wasm filesystem and how the module path is configured for the wasm build.
Fable
⚙ Bash {"command": "cd src/Mod && grep -nE \"SHOW|PLOT|OPENSCAD|ASSEMBLY|INSPECTION|Show|Plot|OpenSCAD|Assembly|Inspection\" CMakeLists.txt", "description": "Check how modules are gated in Mod CMakeLists"}
tool result
13:if(BUILD_ASSEMBLY)
14:  add_subdirectory(Assembly)
15:endif(BUILD_ASSEMBLY)
33:if(BUILD_INSPECTION)
34:  add_subdirectory(Inspection)
35:endif(BUILD_INSPECTION)
53:if(BUILD_OPENSCAD)
54:  add_subdirectory(OpenSCAD)
55:endif(BUILD_OPENSCAD)
69:if(BUILD_PLOT)
70:  add_subdirectory(Plot)
71:endif(BUILD_PLOT)
89:if(BUILD_SHOW)
90:    add_subdirectory(Show)
91:endif(BUILD_SHOW)
Fable
⚙ Bash {"command": "grep -rnE \"BUILD_SHOW|BUILD_PLOT|BUILD_OPENSCAD|BUILD_ASSEMBLY|BUILD_INSPECTION\" src/ CMakeLists.txt cMake/ 2>/dev/null | head -40", "description": "Find BUILD flag option definitions"}
tool result
src/3rdParty/CMakeLists.txt:18:if (BUILD_ASSEMBLY AND NOT FREECAD_USE_EXTERNAL_ONDSELSOLVER)
src/Mod/CMakeLists.txt:13:if(BUILD_ASSEMBLY)
src/Mod/CMakeLists.txt:15:endif(BUILD_ASSEMBLY)
src/Mod/CMakeLists.txt:33:if(BUILD_INSPECTION)
src/Mod/CMakeLists.txt:35:endif(BUILD_INSPECTION)
src/Mod/CMakeLists.txt:53:if(BUILD_OPENSCAD)
src/Mod/CMakeLists.txt:55:endif(BUILD_OPENSCAD)
src/Mod/CMakeLists.txt:69:if(BUILD_PLOT)
src/Mod/CMakeLists.txt:71:endif(BUILD_PLOT)
src/Mod/CMakeLists.txt:89:if(BUILD_SHOW  …[truncated]
Fable
thinking
I'm diving deeper into the CheckInterModuleDependencies function to see what each dependency requires.
Fable
⚙ Bash {"command": "sed -n '15,40p' cMake/FreeCAD_Helpers/CheckInterModuleDependencies.cmake", "description": "Read inter-module dependency requirements"}
tool result
                endif(NOT ${prerequisite})
            endforeach()
        endif(${dependent})
    endfunction(REQUIRES_MODS)

    REQUIRES_MODS(BUILD_ASSEMBLY           BUILD_PART BUILD_PART_DESIGN BUILD_SPREADSHEET)
    REQUIRES_MODS(BUILD_BIM                BUILD_PART BUILD_MESH BUILD_MESH_PART BUILD_DRAFT)
    REQUIRES_MODS(BUILD_DRAFT              BUILD_SKETCHER BUILD_TECHDRAW)
    REQUIRES_MODS(BUILD_FEM                BUILD_PART)
    REQUIRES_MODS(BUILD_IMPORT             BUILD_PART BUIL  …[truncated]
Fable
⚙ Bash {"command": "echo \"===How pure-python mods get to wasm FS - check MainGui/inittab and packaging===\" && ls src/Main/ && echo \"---\" && grep -rn \"Mod/Sketcher\\|Mod/Part\\|--preload\\|preload-file\\|Mod/Start\" /opt/toolchains/src/freecad…
tool result
===How pure-python mods get to wasm FS - check MainGui/inittab and packaging===
CMakeLists.txt
FreeCADGuiPy.cpp
MainCmd.cpp
MainGui.cpp
MainPy.cpp
core-main.dox
freecad.rc.cmake
freecadCmd.rc.cmake
icon.ico
---
Fable
thinking
I'm trying to understand how the Show module works as a custom CMake target that copies sources to the binary directory, and I need to figure out how the WebAssembly build packages the filesystem—given the ~180MB binary size, it's likely embedding everything via a preload mechanism. Let me trace through the main CMakeLists and GUI configuration to see how the Mod directories get bundled into the wasm package.
Fable
⚙ Bash {"command": "grep -rn \"preload\\|embed\\|--preload-file\\|file_packager\\|Mod\\b\\|EMSCRIPTEN\\|WASM\" src/Main/CMakeLists.txt | head -40", "description": "Check Main CMakeLists wasm packaging"}
tool result
src/Main/CMakeLists.txt:8:if(EMSCRIPTEN)
src/Main/CMakeLists.txt:11:    set(FREECAD_WASM_PY_MODULES "")
src/Main/CMakeLists.txt:12:    set(FREECAD_WASM_PY_GUI_MODULES "")
src/Main/CMakeLists.txt:14:        list(APPEND FREECAD_WASM_PY_MODULES Part)
src/Main/CMakeLists.txt:15:        list(APPEND FREECAD_WASM_PY_GUI_MODULES PartGui)
src/Main/CMakeLists.txt:18:        list(APPEND FREECAD_WASM_PY_MODULES Sketcher)
src/Main/CMakeLists.txt:19:        list(APPEND FREECAD_WASM_PY_GUI_MODULES SketcherGui)  …[truncated]
Fable
⚙ Bash {"command": "cat src/Main/WasmInittab.cpp 2>/dev/null | head -80; echo \"=====GUI=====\"; cat src/Main/WasmInittabGui.cpp 2>/dev/null | head -100", "description": "Read generated inittab files"}
tool result
=====GUI=====
Fable
thinking
I need to track down where the WasmInittab.cpp files are generated during the build process and understand how modules get registered. Let me examine the full CMakeLists.txt to see the inittab generation logic and how the Python files are being packaged or mounted into the system.
Fable
⚙ Bash {"command": "sed -n '1,215p' src/Main/CMakeLists.txt", "description": "Read full wasm section of Main CMakeLists"}
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
thinking
I see the distinction now—pure Python modules like Show just need to be accessible on the Python path, while C++ modules like Part and Sketcher require PyImport_AppendInittab registration. Now I'm trying to figure out how the .py files end up on the WebAssembly virtual filesystem, whether through preloading or embedding, and how the packaging works for modules that include Python files.
Fable
⚙ Bash {"command": "cd /opt/toolchains/src/freecad-gui-build && ls && echo \"===Mod dir in build===\" && ls Mod/ 2>/dev/null && echo \"===data/Mod===\" && find . -maxdepth 3 -name \"*.data\" 2>/dev/null | head; echo \"===how FS packaged - look for…
tool result
CMakeCache.txt
CMakeFiles
Coin.pc
Ext
FreeCAD.thumbnailer
LibraryVersions.h
backtrace.cpp
bin
build.ninja
cMake
cmake_install.cmake
coin-default.cfg
compile_commands.json
config.h
data
freecad-thumbnailer
lib
org.freecad.FreeCAD.metainfo.xml
share
src
===Mod dir in build===
===how FS packaged - look for run scripts / html===
Fable
⚙ Bash {"command": "cd /opt/toolchains/src/freecad-gui-build && ls Ext/ 2>/dev/null | head; echo \"===bin===\" && ls -la bin/ | head -30; echo \"===Mod location===\" && find . -type d -name \"Sketcher\" 2>/dev/null | head; find . -type d -path \"*…
tool result
PySide
freecad
===bin===
total 184528
drwxr-xr-x  2 agent agent      4096 Jul  5 01:26 .
drwxr-xr-x 11 agent agent      4096 Jul  5 01:26 ..
-rw-r--r--  1 agent agent    531487 Jul  5 01:26 FreeCAD.js
-rwxr-xr-x  1 agent agent 188407835 Jul  5 01:26 FreeCAD.wasm
===Mod location===
./share/Mod/Sketcher
./src/Mod/Sketcher
./share/Mod/Part
./src/Mod/Part
Fable
thinking
I'm trying to figure out how the modules in `share/Mod/` get loaded into the browser's filesystem. There's no `.data` file, so the filesystem must be mounted at runtime using something like NODEFS, IDBFS, or FETCH. Given that FETCH=1 is set and there's no preload, files are probably being fetched on demand.

The critical thing for my plan is that pure-Python modules need their `.py` files in `share/Mod/<Name>/` and the BUILD flag needs to be ON so the custom target copies and installs them. I should verify that Show actually lands in `share/Mod/` when built, but right now BUILD_SHOW=OFF so it's not there. Let me check how the wasm app loads `share/Mod/` and find the JavaScript harness that s  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm && ls && echo \"===find html harness / loader===\" && find . -maxdepth 3 -name \"*.html\" 2>/dev/null | grep -vi node_modules | head; echo \"===find where share/Mod is served/mounted===\" && grep -rln…
tool result
00-OVERVIEW.md
LibreCAD
aqtinstall.log
boot-test.mjs
boot-test2.mjs
bootshot.mjs
boxrender.mjs
boxrender2.mjs
build-clean.log
build-ctx.log
build-vg.log
build-vh.log
build-vi.log
build-vj.log
build-vk.log
build-vl.log
build-vm.log
build-vn.log
build-vo.log
build-vp.log
build-vp2.log
build-vp3.log
build-vp4.log
build-vp5.log
build-vp6.log
build-vp7.log
build-vp8.log
build-vp9.log
build-vpa.log
build-vpb.log
build-vpc.log
build-vpd.log
build-vpe.log
build-vpf.log
canvassize.mjs
check-deploy.sh
con  …[truncated]
Fable
thinking
I'm looking at the freecad.data.js file, which is a preload bundle generated by the file_packager, and trying to understand how it's built and which module directories it includes.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm && echo \"===what Mod dirs are in the data bundle===\" && grep -oE \"Mod/[A-Za-z]+\" freecad-port/deploy-t1/freecad.data.js 2>/dev/null | sort -u | head -40; echo \"===how data.js built - find file_pa…
tool result
===what Mod dirs are in the data bundle===
Mod/Material
Mod/Part
Mod/Sketcher
===how data.js built - find file_packager invocation===
phase-1-core-engine.md
phase-5-browser-file-io.md
openscad-feasibility.md
freecad-port/deploy/README.md
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm && grep -rn \"file_packager\\|freecad.data\\|--preload\\|share/Mod\\|Mod/Start\" freecad-port/deploy/README.md phase-3-boot-gui.md 2>/dev/null | head -30", "description": "Find file_packager recipe in…
tool result
freecad-port/deploy/README.md:18:`index.html` boots everything. `FreeCAD.js` + `FreeCAD.wasm` (~188 MB) + `freecad.data`
freecad-port/deploy/README.md:19:(virtual FS: stdlib, resources) + `freecad.data.js` (loader). `*.gz` are pre-gzipped
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm && sed -n '1,80p' freecad-port/deploy/README.md", "description": "Read deploy README fully"}
tool result
# FreeCAD → WebAssembly — rough deploy

A rough browser build of FreeCAD (GUI + OCCT kernel + CPython, all compiled to
WebAssembly). Boots the full Qt main window and opens a demo document (a Box with
a cylindrical cut) in a 3D `View3DInventor`.

## Status
- ✅ GUI main window, menus, Report view, workbenches, Python console path.
- ✅ Python → OCCT geometry kernel works (solids are really computed).
- ✅ 3D viewport **composites** (offscreen-FBO trick): gradient background,
  navigation cube, RGB   …[truncated]
Fable
thinking
I need to track down the actual file_packager command that was used to create the freecad.data bundle, so I'm going through the build logs and configuration files to find it.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm && grep -rln \"file_packager\\|\\.data\\b\\|preloadPackage\\|package_uuid\" freecad-port/ 2>/dev/null | grep -viE \"node_modules|\\.wasm$|\\.data$\" | head; echo \"===search build logs and scripts for…
tool result
freecad-port/stage-6-mvp-productionize.md
freecad-port/FreeCAD/package/rattler-build/osx/Info.plist.template
freecad-port/FreeCAD/src/3rdParty/3Dconnexion/inc/SpaceMouse/CActionInput.hpp
freecad-port/FreeCAD/src/3rdParty/3Dconnexion/inc/SpaceMouse/CNavlibInterface.hpp
freecad-port/FreeCAD/src/3rdParty/3Dconnexion/inc/SpaceMouse/CImage.hpp
freecad-port/FreeCAD/src/3rdParty/3Dconnexion/inc/navlib/navlib_ostream.h
freecad-port/FreeCAD/src/3rdParty/3Dconnexion/inc/SpaceMouse/CNavigation3D.hpp
freeca  …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm && grep -rn \"file_packager\\|freecad.data\\|preload\\|share/Mod\\|\\.data\\.js\" freecad-port/stage-6-mvp-productionize.md phase-5-browser-file-io.md 2>/dev/null | head -30", "description": "Find pac…
tool result
phase-5-browser-file-io.md:43:   - Larger/optional → `--preload-file dir@/virtual/path` so Emscripten fetches a
phase-5-browser-file-io.md:67:- Asset bundling strategy implemented (`.qrc` + `--preload-file` data package).
phase-5-browser-file-io.md:70:- A default preloaded part library.
phase-5-browser-file-io.md:83:| Large asset packages slow cold load | Lazy/preload only defaults; fetch extras on demand; compress (Phase 6) |
phase-5-browser-file-io.md:91:- Emscripten FS: MEMFS, IDBFS, `--prelo  …[truncated]
Fable
thinking
I need to track down the actual build script that generates the freecad.data.js file—it's likely in a Makefile, shell script, or the ninja build configuration, so I'm going to search through the build logs and build system files to find where this data bundle gets created.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm && head -c 3000 freecad-port/deploy-t1/freecad.data.js | grep -oE \"loadPackage|Mod/[A-Za-z/]+|share/[A-Za-z/]+\" | sort -u | head -40; echo \"=== is there a mk script in freecad-port? ===\"; ls freec…
tool result
loadPackage
=== is there a mk script in freecad-port? ===
/opt/toolchains/emsdk/upstream/emscripten/ChangeLog.md
/opt/toolchains/emsdk/upstream/emscripten/system/lib/README.md
/opt/toolchains/emsdk/upstream/emscripten/tools/file_packager.py
/opt/toolchains/emsdk/upstream/emscripten/docs/emcc.txt
/opt/toolchains/emsdk/upstream/emscripten/test/test_browser.py
/opt/toolchains/emsdk/upstream/emscripten/tools/shared.py
/opt/toolchains/emsdk/upstream/emscripten/test/test_other.py
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm && python3 -c \"\nimport re\ndata=open('freecad-port/deploy-t1/freecad.data.js').read(2000000)\n# find the metadata json with file listing\nm=re.search(r'metadata\\s*=\\s*({.*?});', data, re.S)\npaths…
tool result
/Mod/Material
/Mod/Part
/Mod/Sketcher
/share/Mod
/share/doc
/share/examples
Fable
thinking
I'm checking the directory structure and mount points to figure out where the Show module needs to be located, looking at how the data.js file mounts things and how Python's sys.path is configured.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm && python3 -c \"\nimport re\ndata=open('freecad-port/deploy-t1/freecad.data.js').read(4000000)\npaths=set(re.findall(r'\\\"filename\\\"\\s*:\\s*\\\"([^\\\"]+)\\\"', data))\ntops=set()\nfor p in paths:…
tool result
freecad/Ext
freecad/Mod/Material
freecad/Mod/Part
freecad/Mod/Sketcher
freecad/share
freecad/share/Mod
python/_sysconfigdata__emscripten_wasm32-emscripten.py
python/python3.14.zip
Fable
thinking
FreeCAD's module structure places modules under `freecad/Mod/` and `freecad/share/Mod`, which the file_packager preloads. Since Show is a pure Python module that installs to `Mod/Show`, I need to enable `BUILD_SHOW=ON` with its dependencies satisfied so the custom target copies and installs it properly, then re-run file_packager to bundle it.

Show has no inittab or C++ registration needed since it's pure Python. It's standalone with no prerequisite modules listed in `BUILD_SHOW`. The runtime dependencies—FreeCAD, FreeCADGui, pivy.coin, weakref, copy, sys, traceback—should all be available, though I need to verify whether pivy is built in the wasm environment since it's the Python binding to  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm && echo \"=== pivy in data bundle? ===\"; python3 -c \"\nimport re\ndata=open('freecad-port/deploy-t1/freecad.data.js').read(4000000)\npaths=set(re.findall(r'\\\"filename\\\"\\s*:\\s*\\\"([^\\\"]+)\\\…
tool result
=== pivy in data bundle? ===
pivy files: []
PySide files: []
=== pivy in source/build ===
/opt/toolchains/src/freecad-gui-build/CMakeCache.txt:576://Check for pivy version using Python at build time
/opt/toolchains/src/freecad-gui-build/CMakeCache.txt:634:FREECAD_USE_PYSIDE:BOOL=OFF
Fable
thinking
Pivy isn't available, so any SceneDetails code paths that import from it—like Camera, ClipPlane, and related utilities—will break if executed, but those imports are safely guarded inside functions rather than at the module level. The core TempoVis show/hide functionality relies on ViewObject.Visibility which doesn't depend on pivy, so I need to check what mTempoVis actually imports at the top level versus what's tucked inside functions.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Show && sed -n '25,55p' mTempoVis.py; echo \"=== ShowUtils full (small) ===\"; cat ShowUtils.py | sed -n '25,60p'", "description": "Check import guards in mTempoVis and Sh…
tool result
# module is named mTempoVis, because Show.TimpoVis exposes the class as its member, and hides the module TempoVis.py

from . import Containers

from . import TVStack

import FreeCAD as App

if App.GuiUp:
    import FreeCADGui as Gui
Wrn = lambda msg: App.Console.PrintWarning(msg + "\n")
Err = lambda msg: App.Console.PrintError(msg + "\n")
Log = lambda msg: App.Console.PrintLog(msg + "\n")

from copy import copy

S_EMPTY = 0  # TV is initialized, but no changes were done through it
S_ACTIVE = 1    …[truncated]
Fable
thinking
The `is3DObject` function handles the missing pivy import gracefully by catching the error and defaulting to True, which means Show degrades well without it. The core show/hide functionality works fine, so enabling and packaging Show requires no special dependencies like inittab, PySide, or pivy. Now I'm moving through the other workbenches more quickly—checking Plot next, which needs matplotlib and PySide.
Fable
Now let me examine Plot, OpenSCAD, Assembly, and Inspection dependencies.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Plot && echo \"===PLOT CMakeLists===\" && cat CMakeLists.txt && echo \"===PLOT imports===\" && grep -nE \"^\\s*(import|from)\\s\" Plot.py | head -40", "description": "Plot…
tool result
===PLOT CMakeLists===
# SPDX-License-Identifier: LGPL-2.1-or-later

SET(PlotMain_SRCS
    Plot.py
)
SOURCE_GROUP("" FILES ${PlotMain_SRCS})

SET(all_files ${PlotMain_SRCS})

ADD_CUSTOM_TARGET(Plot ALL
    SOURCES ${all_files}
)

fc_copy_sources(Plot "${CMAKE_BINARY_DIR}/Mod/Plot" ${all_files})

INSTALL(
    FILES
        ${PlotMain_SRCS}
    DESTINATION
        Mod/Plot
)
===PLOT imports===
24:import FreeCAD
26:import PySide
27:from PySide import QtCore, QtGui
28:import sys
31:    import matplot  …[truncated]
Fable
thinking
Looking at the Plot module structure, it's just a single Python file with minimal dependencies listed in CMakeLists, but it actually requires PySide, matplotlib, and the matplotlib Qt backend — that's a substantial set of dependencies. The module seems incomplete since a typical FreeCAD Plot module would include PlotGui and InitGui.py, but those aren't present here, and the dependency chain appears to be cut off mid-sentence.

The core issue is that matplotlib's Qt backend needs C extensions like _path, ft2font, and Agg compiled against a Qt binding, which makes it impractical to port to WebAssembly without significant effort. matplotlib doesn't have an official wasm build integrated into th  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/OpenSCAD && echo \"===OPENSCAD CMakeLists===\" && cat CMakeLists.txt | head -60 && echo \"===OPENSCAD imports (external only)===\" && grep -rhnE \"^\\s*(import|from)\\s\" …
tool result
===OPENSCAD CMakeLists===
# SPDX-License-Identifier: LGPL-2.1-or-later

IF (BUILD_GUI)
    PYSIDE_WRAP_RC(OpenSCAD_QRC_SRCS Resources/OpenSCAD.qrc)
ENDIF (BUILD_GUI)

SET(OpenSCAD_SRCS
    Init.py
    InitGui.py
    OpenSCAD2Dgeom.py
    OpenSCADFeatures.py
    OpenSCADUtils.py
    OpenSCADCommands.py
    exportCSG.py
    importCSG.py
    tokrules.py
    colorcodeshapes.py
    expandplacements.py
    replaceobj.py
    TestOpenSCADApp.py
)
IF (BUILD_GUI)
	LIST(APPEND OpenSCAD_SRCS TestOpenSCADGui  …[truncated]
Fable
thinking
Looking at the OpenSCAD integration, I need to handle several dependencies: the BUILD_MESH_PART and BUILD_DRAFT modules are disabled since Draft requires additional components like Sketcher, TechDraw, and PySide which aren't available. I'm using ply for parsing CSG expressions and calling the external openscad binary through subprocess to handle mesh operations.

The challenge is that subprocess won't work in WebAssembly environments since there's no process spawning capability. The CSG parser itself could theoretically run headless using just ply, but the module won't load cleanly without Draft and PySide in the initialization chain. The importDXF functions also depend on the Draft module,   …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Assembly && echo \"===ASM App CMakeLists top===\" && sed -n '1,60p' App/CMakeLists.txt; echo \"===ASM external cpp deps / ondsel===\"; grep -rn \"OndselSolver\\|ondsel\\|3…
tool result
===ASM App CMakeLists top===
# SPDX-License-Identifier: LGPL-2.1-or-later

set(Assembly_LIBS
    Part
    PartDesign
    Spreadsheet
    FreeCADApp
    OndselSolver
)

generate_from_py(AssemblyObject)
generate_from_py(AssemblyLink)
generate_from_py(BomObject)
generate_from_py(BomGroup)
generate_from_py(JointGroup)
generate_from_py(ViewGroup)
generate_from_py(SimulationGroup)


SET(Python_SRCS
    AssemblyObject.pyi
    AssemblyObjectPyImp.cpp
    AssemblyLink.pyi
    AssemblyLinkPyImp.cpp
    Bo  …[truncated]
Fable
thinking
Assembly has a dependency chain issue: it needs PartDesign and Spreadsheet to build, but Spreadsheet depends on Draft, which is blocked by a PySide requirement. The module also bundles OndselSolver, a C++ constraint solver for assembly operations.

Now I'm checking whether OndselSolver has any threading hazards, since Assembly's UI layer is heavily Python and PySide-based with commands and initialization code, while also interfacing with C++ libraries from PartDesign and Spreadsheet.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src && echo \"=== OndselSolver threading ===\"; grep -rnE \"std::thread|std::async|thread_local|QThread|std::mutex|<thread>|pthread\" 3rdParty/OndselSolver/ 2>/dev/null | grep -v …
tool result
=== OndselSolver threading ===
3rdParty/OndselSolver/tests/CMakeLists.txt:17:    option(gtest_disable_pthreads "Disable uses of pthreads in gtest." ON)
=== count ===
0
Fable
thinking
OndselSolver is pure C++ math with no threading issues, so it would compile to WebAssembly without problems. Assembly still depends on Spreadsheet, Draft, and PySide though, plus its own UI relies heavily on PySide. Now I'm looking at Inspection, which has both C++ and GUI components—let me check what it depends on and whether it has any threading concerns.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Inspection && echo \"===App CMakeLists LIBS===\"; grep -nE \"LIBS|_link|Mesh|Points|Part\" App/CMakeLists.txt | head; echo \"===Inspection threading hazards===\"; grep -rn…
tool result
Exit code 2
===App CMakeLists LIBS===
3:set(Inspection_LIBS
5:    Mesh
6:    Points
7:    Part
37:target_link_libraries(Inspection ${Inspection_LIBS})
===Inspection threading hazards===
App/PreCompiled.h:46:#include <QFuture>
App/PreCompiled.h:47:#include <QFutureWatcher>
App/PreCompiled.h:48:#include <QtConcurrentMap>
App/InspectionFeature.cpp:39:#include <QFuture>
App/InspectionFeature.cpp:40:#include <QFutureWatcher>
App/InspectionFeature.cpp:41:#include <QtConcurrentMap>
App/Inspe  …[truncated]
Fable
thinking
I'm seeing a serious threading issue in the Inspection code—it's using QtConcurrent::mapped with QFutureWatcher and nesting a QEventLoop, which creates exactly the kind of threading hazard we need to avoid. On WebAssembly where pthreads aren't available, QtConcurrent will either hang or run synchronously on the calling thread since QThreadPool has no actual threads to work with.

Beyond the threading problem, Inspection also requires the Mesh and Points modules to be built, but both are currently disabled. Mesh is a substantial module with external dependencies, so I need to check whether those have WebAssembly ports available. The real fix involves addressing the QtConcurrent hazard directl  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Inspection && sed -n '840,975p' App/InspectionFeature.cpp", "description": "Read InspectionFeature QtConcurrent region"}
tool result
        if (nominal) {
            inspectNominal.push_back(nominal);
        }
    }
    // clang-format on

#if 0
# if 1  // test with some huge data sets
    std::vector<unsigned long> index(actual->countPoints());
    std::generate(index.begin(), index.end(), Base::iotaGen<unsigned long>(0));
    DistanceInspection check(this->SearchRadius.getValue(), actual, inspectNominal);
    QFuture<float> future = QtConcurrent::mapped
        (index, std::bind(&DistanceInspection::mapped, &  …[truncated]
Fable
thinking
I need to locate where `useMultithreading` gets set, since disabling it on WebAssembly is the solution for fixing the Inspection issue.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Inspection && grep -n \"useMultithreading\" App/InspectionFeature.cpp; echo \"===single threaded else branch===\"; sed -n '975,1010p' App/InspectionFeature.cpp", "descript…
tool result
796:    bool useMultithreading = true;
813:        useMultithreading = false;
836:            useMultithreading = false;
933:    if (useMultithreading) {
===single threaded else branch===
        str << "Inspecting " << this->Label.getValue() << "…";
        Base::SequencerLauncher seq(str.str().c_str(), count);

        for (unsigned int i = 0; i < count; i++) {
            res += fMap(i);
        }
    }

    Base::Console().message(
        "RMS value for '%s' with search radius   …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Inspection && sed -n '793,838p' App/InspectionFeature.cpp", "description": "Read useMultithreading decision logic"}
tool result
App::DocumentObjectExecReturn* Feature::execute()
{
    bool useMultithreading = true;

    App::DocumentObject* pcActual = Actual.getValue();
    if (!pcActual) {
        throw Base::ValueError("No actual geometry to inspect specified");
    }

    InspectActualGeometry* actual = nullptr;
    if (pcActual->isDerivedFrom<Mesh::Feature>()) {
        Mesh::Feature* mesh = static_cast<Mesh::Feature*>(pcActual);
        actual = new InspectActualMesh(mesh->Mesh.getValue());
    }
    e  …[truncated]
Fable
thinking
For the Inspection module's threading issue on WebAssembly, I'm disabling multithreading by using a preprocessor conditional that sets `useMultithreading` to false specifically for wasm builds, which bypasses QtConcurrent and the nested event loop problem entirely. Now I'm moving on to examine the C++ module itself.

I need to verify that Inspection's dependencies—specifically the Mesh and Points modules—are portable to wasm, but given the scope and effort involved, that's likely out of scope for now. Let me check the Python initialization files to see how Inspection registers its module names in the inittab, since the App module produces "Inspection" and the Gui module produces "InspectionG  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Inspection && echo \"===App module init name===\"; grep -n \"initModule\\|PyInit\\|InitModule\\|Py_InitModule\\|Base::Interpreter\\|Module = \\|InitModule\\|\\\"Inspection…
tool result
===App module init name===
38:        : Py::ExtensionModule<Module>("Inspection")
46:PyObject* initModule()
48:    return Base::Interpreter().addModule(new Module);
60:    PyObject* mod = Inspection::initModule();
===Gui module===
AppInspectionGui.cpp
CMakeLists.txt
Command.cpp
PreCompiled.h
Resources
ViewProviderInspection.cpp
ViewProviderInspection.h
VisualInspection.cpp
VisualInspection.h
VisualInspection.ui
Workbench.cpp
Workbench.h
===InitGui.py PySide===
Fable
thinking
I'm examining the Inspection module structure—it's written in C++ with separate App and Gui components, minimal Python setup files, and a VisualInspection dialog in the Gui. I need to verify whether the dialog runs modally and check for any threading issues, plus confirm the PyInit macro names for the module initialization table.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Inspection && grep -n \"PyMOD_INIT_FUNC\\|PyInit\\|InitModule\\|initInspection\" App/AppInspection.cpp Gui/AppInspectionGui.cpp; echo \"===modal dialog in Gui===\"; grep -…
tool result
Gui/AppInspectionGui.cpp:62:PyMOD_INIT_FUNC(InspectionGui)
App/AppInspection.cpp:55:PyMOD_INIT_FUNC(Inspection)
===modal dialog in Gui===
Gui/VisualInspection.cpp:81:    : QDialog(parent, fl)
Gui/VisualInspection.cpp:89:        &QDialogButtonBox::helpRequested,
Gui/VisualInspection.cpp:104:    buttonOk = ui->buttonBox->button(QDialogButtonBox::Ok);
Gui/VisualInspection.cpp:217:        QDialog::accept();
Gui/Command.cpp:58:    dlg.exec();
Gui/VisualInspection.h:27:#include <QDialog>
Gui/V  …[truncated]
Fable
thinking
I'm looking at a modal dialog issue in the Inspection GUI where `QDialog::exec()` is called, which creates a blocking modal that could be problematic under asyncify despite Qt's support for nested exec calls. The VisualInspection dialog uses this same modal pattern for the "Inspect..." command, which represents a potential hazard. I need to check whether the Mesh and Points modules build successfully and remain portable since Inspection depends on them, and Assembly has its own dependencies to verify.

Spreadsheet requires Draft, which in turn requires Sketcher and TechDraw along with Python and PySide support, so the entire Assembly chain is blocked by PySide dependencies. Let me now check   …
Fable
⚙ Bash {"command": "grep -nE \"BUILD_MESH:|BUILD_POINTS:|BUILD_MESH_PART:|BUILD_DRAFT:|BUILD_SPREADSHEET:|BUILD_TECHDRAW:|BUILD_PART_DESIGN:\" /opt/toolchains/src/freecad-gui-build/CMakeCache.txt; echo \"=== Mesh external deps ===\"; grep -rnE \"f…
tool result
33:BUILD_DRAFT:BOOL=OFF
79:BUILD_MESH:BOOL=OFF
82:BUILD_MESH_PART:BOOL=OFF
91:BUILD_PART_DESIGN:BOOL=OFF
97:BUILD_POINTS:BOOL=OFF
115:BUILD_SPREADSHEET:BOOL=OFF
124:BUILD_TECHDRAW:BOOL=OFF
=== Mesh external deps ===
src/Mod/Mesh/App/CMakeLists.txt:25:set(Mesh_LIBS
src/Mod/Mesh/App/CMakeLists.txt:30:list(APPEND Mesh_LIBS
src/Mod/Mesh/App/CMakeLists.txt:418:target_link_libraries(Mesh ${Mesh_LIBS})
Fable
thinking
I need to verify what dependencies Mesh actually requires—it has its own algorithms but might optionally use external SMESH libraries through MeshPart/Fem. Let me check what Mesh_LIBS links to and whether there are any threading issues I should be aware of before porting this for Inspection.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src && sed -n '25,45p' Mod/Mesh/App/CMakeLists.txt; echo \"=== Mesh threading ===\"; grep -rlE \"std::thread|std::async\\(|QtConcurrent|QThreadPool|QThread \" Mod/Mesh/App/ 2>/dev…
tool result
set(Mesh_LIBS
    FreeCADBase
    FreeCADApp
)

list(APPEND Mesh_LIBS
    ${QtConcurrent_LIBRARIES}
)

generate_from_py(Edge)
generate_from_py(Facet)
generate_from_py(MeshFeature)
generate_from_py(MeshPoint)
generate_from_py(Mesh)

SET(Mesh_XML_SRCS
    Edge.pyi
    Facet.pyi
    MeshFeature.pyi
    MeshPoint.pyi
    Mesh.pyi
=== Mesh threading ===
Mod/Mesh/App/CMakeLists.txt
Mod/Mesh/App/Core/Functional.h
Mod/Mesh/App/Core/Builder.cpp
Mod/Mesh/App/Core/Curvature.cpp
Mod/Mesh/App/Core/Evaluation  …[truncated]
Fable
thinking
Mesh relies on QtConcurrent across several core files like Functional.h, Builder, Curvature, and Evaluation, which introduces threading hazards that need addressing. Points has a dependency on the external E57Format library that needs porting, plus its own QtConcurrent usage issues. This means tackling Inspection's prerequisites—Mesh and Points—requires fixing those QtConcurrent hazards in both modules and getting E57Format ported first. Let me look at how Mesh's Functional.h uses QtConcurrent to understand the scope of what needs fixing.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src && sed -n '25,45p' Mod/Points/App/CMakeLists.txt; echo \"=== Mesh Functional.h concurrent pattern ===\"; grep -nE \"QtConcurrent|blockingMapped|ThreadSize|QThreadPool|serial|#…
tool result
    target_include_directories(
        Points
        SYSTEM
        PUBLIC
        ${CMAKE_BINARY_DIR}/src/3rdParty/libE57Format
        ${CMAKE_SOURCE_DIR}/src/3rdParty/libE57Format/include
    )
else()
  find_package(E57Format REQUIRED)
endif()

set(Points_LIBS
    FreeCADApp
    ${QtConcurrent_LIBRARIES}
)

generate_from_py(Points)

SET(Points_SRCS
    AppPoints.cpp
    AppPointsPy.cpp
=== Mesh Functional.h concurrent pattern ===
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src && grep -nE \"QtConcurrent|namespace|template|inline|return\" Mod/Mesh/App/Core/Functional.h | head -20; echo \"=== count QtConcurrent call sites in Mesh ===\"; grep -rn \"QtC…
tool result
31:namespace MeshCore
33:template<class Iter, class Pred>
64:}  // namespace MeshCore
=== count QtConcurrent call sites in Mesh ===
1
=== Points E57 3rdParty present? ===
CHANGELOG.md
CMakeLists.txt
CONTRIBUTING.md
Fable
thinking
I found there's only one QtConcurrent call site in the Mesh code within Functional.h, so I need to examine that template file closely to identify the exact fix needed. I also notice Points has libE57Format bundled in the 3rdParty directory, which is relevant context for understanding the dependencies.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src && cat Mod/Mesh/App/Core/Functional.h; echo \"=== who uses parallel_transform ===\"; grep -rn \"parallel_transform\\|Functional.h\" Mod/Mesh/App/ | head", "description": "Read…
tool result
// SPDX-License-Identifier: LGPL-2.1-or-later

/***************************************************************************
 *   Copyright (c) 2018 Werner Mayer <wmayer[at]users.sourceforge.net>     *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or    …[truncated]
Fable
thinking
I'm seeing that `std::async` with `std::launch::async` causes issues on WebAssembly since it tries to spawn threads that don't work properly there. The problem cascades even when the thread count is set to 2 or higher — it still hangs. Since callers are passing a `threads` parameter (likely derived from hardware concurrency), the cleanest solution would be to either force serial execution on wasm by always using `std::sort` in parallel_sort, or ensure callers pass `threads=1` on that platform.

For the Mesh code, I found threading hazards in Functional.h with `std::async`, and there's at least one QtConcurrent usage somewhere in the codebase. Now I need to trace back where Show is being impo  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src && echo \"=== who imports Show ===\"; grep -rln \"import Show\\|from Show\" Mod/Sketcher Mod/Part Gui 2>/dev/null | head; grep -rn \"import Show\\|from Show\" Mod/Sketcher/Gui…
tool result
=== who imports Show ===
Mod/Sketcher/Gui/ViewProviderSketch.cpp
Mod/Part/AttachmentEditor/TaskAttachmentEditor.py
Mod/Part/Gui/DlgExtrusion.cpp
Mod/Part/Gui/TaskAttacher.cpp
=== the one QtConcurrent:: in Mesh ===
Mod/Mesh/App/Core/Curvature.cpp:86:            = QtConcurrent::mapped(mySegment, std::bind(&FacetCurvature::Compute, &face, sp::_1));
Fable
thinking
The Show module is being imported from multiple places in the codebase—ViewProviderSketch.cpp, DlgExtrusion.cpp, and TaskAttacher.cpp on the C++ side, plus TaskAttachmentEditor.py in Python—which explains the "No module named Show" error and why fixing it is critical for enabling visibility automation in Sketcher and the Part attachment editor. Now I'm checking how ViewProviderSketch.cpp actually uses Show to understand the dependency chain.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src && grep -n \"Show\" Mod/Sketcher/Gui/ViewProviderSketch.cpp | head; echo \"=== Part DlgExtrusion ===\"; grep -n \"import Show\\|Show\\.\" Mod/Part/Gui/DlgExtrusion.cpp | head …
tool result
305:        {"ShowLinks",
309:          &Client.ShowLinks}},
310:        {"ShowSupport",
314:          &Client.ShowSupport}},
453:    updateBoolProperty("ShowGrid", &Client.ShowGrid, true);
611:        ShowLinks,
617:        ShowSupport,
862:        if (detectAndShowPreselection(result) && sketchHandler) {
1214:                    detectAndShowPreselection(resolvedClickResult);
1422:                    detectAndShowPreselection(resolvedClickResult);
=== Part DlgExtrusion ===
235:                  …[truncated]
Fable
thinking
So Show is being imported and used at runtime through the Python interpreter in both DlgExtrusion.cpp and TaskAttacher.cpp, which means it's needed by the Part's extrusion dialog, the attachment editor, and Sketcher. This confirms that enabling BUILD_SHOW and fixing the packaging should resolve the issue since Show is purely a runtime Python dependency. Let me verify the Show usage in TaskAttacher.cpp to be complete.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src && grep -n \"Show\\.\\|TempoVis\\|tv\\.\" Mod/Part/Gui/TaskAttacher.cpp Mod/Part/Gui/DlgExtrusion.cpp | grep -iE \"TempoVis|tv\\.|Show\\.\" | head -20", "description": "Check …
tool result
Mod/Part/Gui/DlgExtrusion.cpp:236:                "tv = Show.TempoVis(App.ActiveDocument, tag= 'PartGui::DlgExtrusion')\n"
Mod/Part/Gui/DlgExtrusion.cpp:237:                "tv.hide([%1])"
Mod/Part/Gui/TaskAttacher.cpp:1355:                      "from Show.Containers import isAContainer\n"
Mod/Part/Gui/TaskAttacher.cpp:1356:                      "_tv_%4 = Show.TempoVis(App.ActiveDocument, tag= 'PartGui::TaskAttacher')\n"
Fable
thinking
I'm checking whether the hide() method relies on pivy by tracing through the TempoVis implementation to confirm it operates directly on ViewObject.Visibility without any pivy dependencies on the critical path.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src && grep -n \"def hide\\|def show\\|def modifyVPProperty\\|VProperty\" Mod/Show/mTempoVis.py | head; sed -n '270,300p' Mod/Show/mTempoVis.py", "description": "Inspect TempoVis.…
tool result
124:        example: tv.has(VProperty(obj, "Visibility"))"""
157:        Example: tv.modify(VProperty(obj, "Visibility", True))"""
246:    def modifyVPProperty(self, doc_obj_or_list, prop_names, new_value=JUST_SAVE, mild_restore=None):
277:                from .SceneDetails.VProperty import VProperty
284:                    self.save(VProperty(doc_obj, prop_name, new_value))
286:                    self.modify(VProperty(doc_obj, prop_name, new_value), mild_restore)
290:        from .SceneDetails  …[truncated]
Fable
thinking
Checking VProperty.py to confirm it doesn't have pivy imports at the top level — it only brings in SceneDetail, which also avoids pivy dependencies. The visibility hiding mechanism works through ViewObject without needing pivy, so the Show core module is completely independent. Now I'm ready to write out the full plan.

I'll create a directory structure with plan.md documenting the feasibility assessment and patch files for the Inspection threading issue and Mesh Functional.h fix. Show is ready to go — it's pure Python with no PySide or pivy requirements on the core path, just needs the build configuration updated to copy the module into the data bundle. That's a matter of hours. Plot won't   …
Fable
⚙ Bash {"command": "grep -nE \"CMAKE_INSTALL_PREFIX|FREECAD_WASM_NODERAWFS|CMAKE_BINARY_DIR\" /opt/toolchains/src/freecad-gui-build/CMakeCache.txt | head; echo \"=== how Mod dirs land: build vs install ===\"; ls /opt/toolchains/src/freecad-gui-bui…
tool result
<persisted-output>
Output too large (43KB). Full output saved to: /home/agent/.claude/projects/-home-magik6k-lcad-wasm/17f09f89-ce7c-4f49-aa6a-cf0521026805/tool-results/b2vss3t2d.txt

Preview (first 2KB):
285:CMAKE_INSTALL_PREFIX:PATH=/opt/toolchains/freecad-dist
666:FREECAD_WASM_NODERAWFS:BOOL=OFF
2663://CMAKE_INSTALL_PREFIX during last run
2664:_GNUInstallDirs_LAST_CMAKE_INSTALL_PREFIX:INTERNAL=/opt/toolchains/freecad-dist
=== how Mod dirs land: build vs install ===
Material
Part
Sketcher
Star  …[truncated]
Fable
thinking
I'm working through the file system layout where the FreeCAD Mod directories get mapped from the build location at `/opt/toolchains/freecad-dist/Mod/<Name>` to the runtime path `/freecad/Mod/<Name>`, and the data bundle was configured with file_packager to handle this mapping. After running the install step, I need to verify where the Show module ends up in this structure.

Now I'm setting up the file_packager recipe with the correct preload paths based on the install prefix, making sure the Ext, share, and python directories are properly mounted. The key is that Python's sys.path needs to include `/freecad/Mod` for module discovery, which already works for existing modules like Sketcher and  …
Fable
I have all the information I need. Let me create the deliverables directory and write the plan and patches.
Fable
⚙ Bash {"command": "mkdir -p /home/magik6k/lcad-wasm/porting/small-python-mods && echo created", "description": "Create output directory"}
tool result
created
Fable
⚙ Write {"file_path": "/home/magik6k/lcad-wasm/porting/small-python-mods/inspection-wasm.patch", "content": "--- a/src/Mod/Inspection/App/InspectionFeature.cpp\n+++ b/src/Mod/Inspection/App/InspectionFeature.cpp\n@@ -793,7 +793,15 @@\n App::Documen…
tool result
File created successfully at: /home/magik6k/lcad-wasm/porting/small-python-mods/inspection-wasm.patch (file state is current in your context — no need to Read it back)
Fable
⚙ Write {"file_path": "/home/magik6k/lcad-wasm/porting/small-python-mods/mesh-functional-wasm.patch", "content": "--- a/src/Mod/Mesh/App/Core/Functional.h\n+++ b/src/Mod/Mesh/App/Core/Functional.h\n@@ -30,6 +30,13 @@\n namespace MeshCore\n {\n temp…
tool result
File created successfully at: /home/magik6k/lcad-wasm/porting/small-python-mods/mesh-functional-wasm.patch (file state is current in your context — no need to Read it back)
Fable
thinking
I need to examine the Curvature.cpp file and check how Points are handled with QtConcurrent to ensure the Mesh and Points fixes are complete.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src && sed -n '70,110p' Mod/Mesh/App/Core/Curvature.cpp; echo \"=== Points QtConcurrent sites ===\"; grep -rn \"QtConcurrent::\" Mod/Points/App/ | head; echo \"=== Evaluation.cpp …
tool result
{
    myCurvature.clear();
    MeshRefPointToFacets search(myKernel);
    FacetCurvature face(myKernel, search, myRadius, myMinPoints);

    if (!parallel) {
        Base::SequencerLauncher seq("Curvature estimation", mySegment.size());
        for (FacetIndex it : mySegment) {
            CurvatureInfo info = face.Compute(it);
            myCurvature.push_back(info);
            seq.next();
        }
    }
    else {
        // NOLINTBEGIN
        QFuture<CurvatureInfo> future
            = QtC  …[truncated]
Fable
thinking
I'm tracking down where the `parallel` parameter gets set in Curvature.cpp — the issue is that `waitForFinished()` will hang on WebAssembly with QtConcurrent::mapped, so I need to either force `parallel=false` for wasm builds or add a guard at the call site. Meanwhile, I'm checking whether Points.cpp's use of `blockingMap` automatically falls back to serial execution on single-threaded wasm environments.

QtConcurrent::blockingMap relies on QThreadPool, which can deadlock when there are zero threads available on a no-pthread wasm build. Qt's concurrent utilities don't have a built-in serial fallback flag, so I'll need to replace the blocking map calls with explicit serial loops guarded by pr  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src && grep -rn \"SetComputeMode\\|bool parallel\\|parallel =\\|Parallel\\|hardware_concurrency\\|int threads\" Mod/Mesh/App/Core/Curvature.h Mod/Mesh/App/Core/Curvature.cpp Mod/M…
tool result
Mod/Mesh/App/Core/Curvature.h:70:    void ComputePerFace(bool parallel);
Mod/Mesh/App/Core/Curvature.cpp:69:void MeshCurvature::ComputePerFace(bool parallel)
Mod/Mesh/App/Core/Evaluation.cpp:993:    int threads = int(std::thread::hardware_concurrency());
=== threads source in Evaluation ===
        }
    }

    // sort the edges
    // std::sort(edges.begin(), edges.end(), Edge_Less());
    int threads = int(std::thread::hardware_concurrency());
    MeshCore::parallel_sort(edges.begin(), edges.e  …[truncated]
Fable
thinking
The `threads=1` guard in Functional.h handles the Evaluation.cpp case safely, and I should add a similar guard inside ComputePerFace to force serial execution on wasm regardless of what callers pass. For Points.cpp, I need to replace the blockingMap with a serial alternative using ifdef guards.
Fable
Now I'll write the comprehensive plan.
Fable
⚙ Write {"file_path": "/home/magik6k/lcad-wasm/porting/small-python-mods/plan.md", "content": "# WASM Port Plan — Small Python Modules: Show, Plot, OpenSCAD, Assembly, Inspection\n\nScope slug: `small-python-mods`. Target tree: `/home/magik6k/lcad-…
tool result
File created successfully at: /home/magik6k/lcad-wasm/porting/small-python-mods/plan.md (file state is current in your context — no need to Read it back)
Fable
thinking
I'm structuring the summary with the required fields—slug, title, feasibility, oneLineVerdict, effort, buildOrder, and deliverableFile—while deciding how to represent the overall feasibility across these five modules with varying complexity levels. Since the Show module is configuration-only and takes priority, I'll set the top-level feasibility to reflect that, though the verdict needs to capture the full scope. Now I'm listing the external dependencies and build configuration — the Inspection track modules that need to be initialized, the cmake flags to enable Show, Mesh, Points, and Inspection builds while keeping the E57 format as an internal dependency, and I'll finalize the deliverable  …
Fable
The plan and patch files are written. Let me return the structured summary.
Fable
⚙ StructuredOutput {"slug": "small-python-mods", "title": "Small Python Modules: Show, Plot, OpenSCAD, Assembly, Inspection", "feasibility": "config-only", "oneLineVerdict": "Show is a trivial config-only win (pure Python, no PySide/pivy on the critical path)…
tool result
Structured output provided successfully