Add file_assoc: resolve the app registered for a file type#428
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shell_open opens a file with whatever app is registered for it; file_assoc answers the inverse, read-only question - which app is that? Given a path, .ext or bare ext it returns the registered executable, friendly app name, open command line and MIME content type via the Windows AssocQueryStringW shell API. normalize_ext is the pure path/.ext/bare-ext to .ext helper. The assembly logic is unit-testable without Windows through an injectable resolver seam. The natural companion to open_path: one tells you what would open a file, the other opens it.
Up to standards ✅🟢 Issues
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| Metric | Results |
|---|---|
| Complexity | 34 |
| Duplication | 0 |
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Why
open_path(shell_open) opens a file with whatever app is registered for it; this answers the inverse, read-only question — which app is that? Useful to assert "PDFs open in Acrobat, not the browser" before driving an open. Third feature of the ROUND-15 cross-app OS lane (aftershell_openandidle_keepawake).What
A headless
utils/file_assoc/module:normalize_ext(target)— pure helper: path /.ext/ bareext→ lowercased.ext(takes the last extension; rejects empty / extensionless).file_association(target, *, resolver=None)— returns{ext, command, exe, friendly, content_type}for the file type, via the WindowsAssocQueryStringWshell API. The app fields areNonewhen nothing is registered.The assembly logic is unit-testable without Windows through an injectable
resolverseam; the live lookup is Windows-only (raises elsewhere directing to passresolver=, mirroringidle_keepawake's probe).AssocQueryStringWis a single documented two-pass ctypes call (size query → buffer), no COM.Five-layer coverage
je_auto_control/utils/file_assoc/(noPySide6).je_auto_control/__init__.py+__all__.AC_normalize_ext(pure),AC_file_association.ac_*tools (both read-only).Docs: EN/Zh
v205_features_doc.rst+ WHATS_NEW. Headless testtest_file_assoc_batch.py(10 tests, injected resolver). Verified the real Win32AssocQueryStringWpath end-to-end on Windows (.txt→Notepad,.html→Edge). ruff / pylint 10.00 / bandit / radon clean.