FreeCAD 1.1 loads addons from versioned user dir (v1-1/Mod); workbench installed to FreeCAD/Mod is silently ignored

[mattkanwisher]

Environment

• FreeCAD 1.1.1, macOS 15, freecad-mcp @ de4fed2

Bug

FreeCAD 1.1 reads user modules from the versioned data dir:

~/Library/Application Support/FreeCAD/v1-1/Mod/      # 1.1 actually loads this
~/Library/Application Support/FreeCAD/Mod/           # installed here -> silently ignored

Installing AICopilot into the unversioned Mod (which the setup flow targets, and which is the correct path for FreeCAD 1.0) produces no error — FreeCAD simply never loads the workbench, the AI socket never appears, and the MCP bridge reports "FreeCAD socket not available" with no hint why.

Suggested fix

Have the installer query the real path (FreeCAD.getUserAppDataDir() via freecadcmd -c) or install into both locations; at minimum document the v1-1 path for FreeCAD 1.1 users. A log line from the bridge listing the expected Mod dir would also make this diagnosable.

(Same underlying convention on Windows/Linux: %APPDATA%\FreeCAD\v1-1\Mod, ~/.local/share/FreeCAD/v1-1/Mod.)

[FlatterAtMainz]

Confirmed and fixed in #14 — exactly the approach you suggested. getFreeCadModDir() now shells out to freecadcmd -c "import FreeCAD; print(FreeCAD.getUserAppDataDir())" and uses the real path, falling back to the old per-OS guess only if that fails (older FreeCAD, freecadcmd not found/on PATH).

One thing worth flagging for review: naively parsing the freecadcmd output isn't quite enough — import FreeCAD triggers loading of every installed Mod addon, and some (AICopilot itself included, via its own Init.py) print their own startup message as a side effect. That corrupted the captured path during testing (got back ".../v1-1/\nAICopilot Workbench loading.../Mod" instead of a clean path). The fix in #14 tags the target line with a marker (__FREECAD_USER_DIR__:) and only reads that back out, so it's immune to any addon noise on stdout.

Verified directly against a real FreeCAD 1.1.3 install: resolves correctly to .../FreeCAD/v1-1/Mod.