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Last active March 2, 2025 21:11
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icsp ics to tsv converter in bash
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useicsp.md

icsp: a ICS to TSV converter

Alexandre Lotte, the author of icsp describes it as a "Small, fast and simple command-line tool to conver calendar exports (.ics files) into TSV/CSV files for easy analysis and usage in broader use-cases."

And so it is.

I had accidentally imported a holiday calendar into my default Proton Calendar, when I realized two very horrible things: (1) I had no backup; and (2) no one really provides tools for removing entries from calendars in bulk. Later, I would add "Proton Calendar doesn't have a versioning system". But then, no one else does either.

I was screwed.

A few minutes (OK, about a half hour) of searching the Internet, and I found icsp: which turned out to be everything its author wrote that it is.

$ icsp MyCalendar.ics > MyCalendar.tsv

Load up MyCalendar.tsv into LibreOffice Calc, sort on SUBJECT, remove the offending rows (around 100 or so) and then Save. Then convert back to ics:

$ icsp -r MyCalendar.tsv > NewCalendar.ics

(the "-r" option tells icsp to reverse the conversion process from TSV to ICS, it is required)

Then import into Proton Calendar.

Voila!

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