bug#40137: 25.1; ERC ignore function should allow specifying a limited duration

[Lars Ingebrigtsen]

Amin Bandali <bandali@gnu.org> writes:

> Anyhow, if anyone knows functions for parsing relative dates/times, I'd
> appreciate it if you could point them out to me.

Looks like org-element-timestamp-parser is the org time parser...
probably a bit excessive.  :-)

We'd want to parse stuff like 1m3d, right?  Which is awfully like what
iso8601-parse-duration accepts:

(iso8601-parse-duration "P3Y6M4DT12H30M5S")
=> (5 30 12 4 6 3 nil -1 nil)

(iso8601-parse-duration "P3W")
=> (nil nil nil 21 nil nil nil -1 nil)

So just upcase and add a P to the start and we're there.  :-)

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