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I haven't come across of any project like that, but in case anyone wants to implement this and doesn't know where to start, here's a way to do it on a freedesktop-compatible linux:
Make a userspace daemon process that adds eBPF tracepoints[0] to open{,_at} etc syscalls which match files of your user directories with specific extensions (e.g. .docx).
Associate PIDs that open those files with their .desktop entries[1]
Store results in some database like sqlite3.[2]
Search this database with your favorite interface, like a CLI script or a GNOME shell search provider[3].
I have seen this Rust project on HN which does something similar but with file attribute syscalls, you can use it as reference: https://github.com/javierhonduco/sweeper
[0]: https://github.com/iovisor/bpftrace
I haven't come across of any project like that, but in case anyone wants to implement this and doesn't know where to start, here's a way to do it on a freedesktop-compatible linux:
Make a userspace daemon process that adds eBPF tracepoints[0] to open{,_at} etc syscalls which match files of your user directories with specific extensions (e.g. .docx).
Associate PIDs that open those files with their .desktop entries[1]
Store results in some database like sqlite3.[2]
Search this database with your favorite interface, like a CLI script or a GNOME shell search provider[3].
I have seen this Rust project on HN which does something similar but with file attribute syscalls, you can use it as reference: https://github.com/javierhonduco/sweeper
[0]: https://github.com/iovisor/bpftrace