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Wed, 12 Feb 2025 00:20:54 -0500 (EST) From: Richard Lawrence <rwl@HIDDEN> To: Paul Eggert <eggert@HIDDEN>, Stefan Kangas <stefankangas@HIDDEN> Subject: Re: bug#74869: Fwd: [PATCH] Add predicates for decoded times and time deltas In-Reply-To: <a10d8686-72fa-427a-a2c6-1c1331d887c3@HIDDEN> References: <e6537a9d-3f74-46a0-9bbd-ef63d045f4c2@HIDDEN> <7be82ecf-0d4f-488a-94ae-3f39fe886edb@HIDDEN> <CADwFkmmZgoQicu+p9+SsRchsupiRDRhkMNPjtrxPjr_npfpt6w@HIDDEN> <a10d8686-72fa-427a-a2c6-1c1331d887c3@HIDDEN> Date: Wed, 12 Feb 2025 06:20:45 +0100 Message-ID: <87bjv7kac2.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 74869 Cc: 74869 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.7 (-) Paul Eggert <eggert@HIDDEN> writes: > On 2/11/25 11:14, Stefan Kangas wrote: > >> Does that mean to imply that this bug is a wontfix? > > Given rwl's December 29 message > <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=74869#16> it sounds like > it might be better to have something like an icalendar-decoded-time-p > function, which follows the iCalendar standard as opposed to Emacs's > more-idiosyncratic rules. So, not a wontfix; more a "let's keep this in > iCalendar for now". Yes, that's fine with me; so I guess this bug can be closed. By the way, Paul, since you seem to be the (a?) local expert on time-related stuff: I think I am getting close to having a working implementation of iCalendar recurrence rules, which are needed to have fully working semantics for iCalendar date-time values (because time zone definitions use recurrence rules). But the code has been difficult to write and I would really appreciate having an expert look over it when it's ready...would you have any time for that in the nearish future?
bug-gnu-emacs@HIDDEN:bug#74869; Package emacs.
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Tue, 11 Feb 2025 16:44:21 -0800 (PST) Message-ID: <a10d8686-72fa-427a-a2c6-1c1331d887c3@HIDDEN> Date: Tue, 11 Feb 2025 16:44:21 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: bug#74869: Fwd: [PATCH] Add predicates for decoded times and time deltas To: Stefan Kangas <stefankangas@HIDDEN> References: <e6537a9d-3f74-46a0-9bbd-ef63d045f4c2@HIDDEN> <7be82ecf-0d4f-488a-94ae-3f39fe886edb@HIDDEN> <CADwFkmmZgoQicu+p9+SsRchsupiRDRhkMNPjtrxPjr_npfpt6w@HIDDEN> Content-Language: en-US From: Paul Eggert <eggert@HIDDEN> Autocrypt: addr=eggert@HIDDEN; keydata= xsFNBEyAcmQBEADAAyH2xoTu7ppG5D3a8FMZEon74dCvc4+q1XA2J2tBy2pwaTqfhpxxdGA9 Jj50UJ3PD4bSUEgN8tLZ0san47l5XTAFLi2456ciSl5m8sKaHlGdt9XmAAtmXqeZVIYX/UFS 96fDzf4xhEmm/y7LbYEPQdUdxu47xA5KhTYp5bltF3WYDz1Ygd7gx07Auwp7iw7eNvnoDTAl KAl8KYDZzbDNCQGEbpY3efZIvPdeI+FWQN4W+kghy+P6au6PrIIhYraeua7XDdb2LS1en3Ss mE3QjqfRqI/A2ue8JMwsvXe/WK38Ezs6x74iTaqI3AFH6ilAhDqpMnd/msSESNFt76DiO1ZK QMr9amVPknjfPmJISqdhgB1DlEdw34sROf6V8mZw0xfqT6PKE46LcFefzs0kbg4GORf8vjG2 Sf1tk5eU8MBiyN/bZ03bKNjNYMpODDQQwuP84kYLkX2wBxxMAhBxwbDVZudzxDZJ1C2VXujC OJVxq2kljBM9ETYuUGqd75AW2LXrLw6+MuIsHFAYAgRr7+KcwDgBAfwhPBYX34nSSiHlmLC+ KaHLeCLF5ZI2vKm3HEeCTtlOg7xZEONgwzL+fdKo+D6SoC8RRxJKs8a3sVfI4t6CnrQzvJbB n6gxdgCu5i29J1QCYrCYvql2UyFPAK+do99/1jOXT4m2836j1wARAQABzSBQYXVsIEVnZ2Vy dCA8ZWdnZXJ0QGNzLnVjbGEuZWR1PsLBlQQTAQgAPwIbAwYLCQgHAwIGFQgCCQoLBBYCAwEC HgECF4AWIQR+N5Kp2Kz31jO8FYjtl+kOYqp+NAUCZiLOewUJHWQLDAAKCRDtl+kOYqp+NHGE D/9Wmbk+cAaQsYLPGBvyzIjZIRzo/V2p3ZwckVA1VEQivx5azu1cs86qDoVIe45AtwmKOvdV wTQd/QeglkZR6D2YPW7UR/7emajyJZZcy+etVTDKoaw1i6/hmd/CpGjUeUSvgoPs6nYR+1lo pSXTpaGrh1W0qQHalSkOOwCHG3HtGk9Ve2AERDUYxmcn8/eZHb7xpUJEJMBBI1bx/zcw1EtB rjsQ1R1faJ/r/7LPAyV36RLvnbX69PylHKQEbJoaY9aUb2Vpm63ni3FeTA7/3jpPvaSRWHJh vPYx6Fm2Ln8pI0Yf/W2B8QMiPTnF/LnH2kvUcf9VXm+1mQJ3fBFU25HZwBhuqZ24IeKymPEt BUMQAum97Dto0jSgR2OUvX7z+twhpQEgRGBzPHYwDi4SxF5Z4Q5Y7B7a++HP9tIxG6CVFIwI 4xVaZud18bPa0YBL+cISmMgxq7h7yoVXl6u3pm9Yiv+W6Lp9QGN8Rw1VuJMOoFCYuoxG8mXO TA5b1jvlQ32gHFFhqErDAhNJRsfgrpe9Gok4Ycp+rWljbvS5Wrl0uth5MP7FbaHN2kmTZibq KXAd//IqczhDyU6qnW6ao+h4iDBDgYgRbQjmToX/vmIdEMzvPGqWXKhe/q1TYMuOO+IfP+bI fyPFH29nVN/o9c4J7myeKvv3HKSXdSVjlh2V787BTQRMgHJkARAApoXrvxP3DIfjCNOtXU/P dwMShKdX/RlSs5PfunV1wbKP8herXHrvQdFVqECaTSxmlhzbk8X0PkY9gcVaU2O49T3qsOd1 cHeF52YFGEt0LhsBeMjgNX5uZ1V76r8gyeVlFpWWb0SIwJUBHrDXexF67upeRb2vdHBjYDNe ySn+0B7gFEqvVmZu+LadudDp6kQLjatFvHQHUSGNshBnkkcaTbiI9Pst0GCc2aiznBiPPA2W QxAPlPRh3OGTsn5THADmbjqY6FEMLasVX8DSCblMvLwNeO/8SxziBidhqLpJCqdQRWHku5Xx gIkGeKOz5OLDvXHWJyafrEYjjkS6Ak6B5z6svKliClWnjHQcjlPzyoFFgKTEfcqDxCj4RY0D 0DgtFD0NfyeOidrSB/SzTe2hwryQE3rpSiqo+0cGdzh4yAHKYJ+UrXZ4p93ZhjGfKD1xlrNY DlWyW9PGmbvqFuDmiIAQf9WD/wzEfICc+F+uDDI+uYkRxUFp92ykmdhDEFg1yjYsU8iGU69a Hyvhq36z4zctvbqhRNzOWB1bVJ/dIMDvsExGcXQVDIT7sDNXv0wE3jKSKpp7NDG1oXUXL+2+ SF99Kjy753AbQSAmH617fyBNwhJWvQYg+mUvPpiGOtses9EXUI3lS4v0MEaPG43flEs1UR+1 rpFQWVHo1y1OO+sAEQEAAcLBfAQYAQgAJgIbDBYhBH43kqnYrPfWM7wViO2X6Q5iqn40BQJm Is58BQkdZAsMAAoJEO2X6Q5iqn40Q68QAJ9GubS/ej30Vc4idoZdc0IyMcL7kQJbMohF+Tyn ZE+TGn9WvzP10yLyzoI0vNlcNfP92d2MS//pFjOuANb5mwyiEYA+rDZIdS4ZZpHxCs2sxMC4 afLCf3kv4aMnTeBvb9na403dlczz9cAacvsmniSFdpb1+BzMpYbybglU5oYMGhYT2nnCRjXN 6S2nKYt4mjJeeOuxHrdeqQQdVBNYeNfTcPePeqvZ2+bD6u9yxZtaV+wxdpqglosQvjqhOYz7 h50/ZTSq70/npoCq44TzdJKttaYvlW6ziRz0g4RRAqZyoxjYXiy5qj8r8zXJuB11ApZCGuKn /usbji9RYbflAhxFeh4LMmpDVi6BrF30b73Md59K7PuEKN1NxzlWiqqQHZZ9momN0GXLPcGq 4uyfq7yVEy7wP5PMOh6oqscKklE3gFQtq0P1Ki0xqdF6Fq5LPJc+0Db2CYkVIy7Xaa/f74I3 sOfQfEeDylVXR5iDfUJEYv/0DYhOr7q5/0b1kh3M4wkrB4C5jVNHjIIj+RsAK90c3t38OhAl jiSN7Bkwy24Afy8eIu6wWzvhnsQGpZPB+IffmxT1wkTy8UxZKjUWV0C82iphVgCUUi2f9sDV Q/tNcwVWmOS+gdv9Wk6tdGeM+Ee+Qs6YG05jcSoajzF0TL07ajLcayRq2j1Os2CtQ8qu Organization: UCLA Computer Science Department In-Reply-To: <CADwFkmmZgoQicu+p9+SsRchsupiRDRhkMNPjtrxPjr_npfpt6w@HIDDEN> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 74869 Cc: 74869 <at> debbugs.gnu.org, Richard Lawrence <rwl@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) On 2/11/25 11:14, Stefan Kangas wrote: > Does that mean to imply that this bug is a wontfix? Given rwl's December 29 message <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=74869#16> it sounds like it might be better to have something like an icalendar-decoded-time-p function, which follows the iCalendar standard as opposed to Emacs's more-idiosyncratic rules. So, not a wontfix; more a "let's keep this in iCalendar for now".
bug-gnu-emacs@HIDDEN:bug#74869; Package emacs.
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I need type predicates to >> do such dispatching. > > Not necessarily; you can instead try each function in turn and use the first > that works. > > I have some qualms about saying that decoded times are a "type". Whether a > decoded time is valid depends on the timezone: (0 30 2 10 3 2024 0 t -21600) is > a valid decoded time in Phoenix but not in Denver, because clocks sprang forward > over that time in Denver but not in Phoenix. When data interpretation gets that > complicated, the Emacs notion of "type" is not always the best. Does that mean to imply that this bug is a wontfix?
bug-gnu-emacs@HIDDEN:bug#74869; Package emacs.
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Sun, 5 Jan 2025 03:45:18 -0500 (EST) From: Richard Lawrence <rwl@HIDDEN> To: 74869 <at> debbugs.gnu.org Subject: Re: [PATCH] Add predicates for decoded times and time deltas References: <87zfkeud74.fsf@HIDDEN> Date: Sun, 05 Jan 2025 09:45:10 +0100 Message-ID: <878qrp8x9l.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 74869 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.7 (-) I'm also forwarding a mis-addressed email back to the relevant bug list -------------------- Start of forwarded message -------------------- From: Richard Lawrence <rwl@HIDDEN> To: Paul Eggert <eggert@HIDDEN> Subject: Re: [PATCH] Add predicates for decoded times and time deltas Date: Sun, 29 Dec 2024 09:05:03 +0100 Paul Eggert <eggert@HIDDEN> writes: > On 12/28/24 07:56, Richard Lawrence wrote: >> I need to use >> `calendar-extract-month' with a plain date value, but >> `decoded-time-month' with a date-time value. I need type predicates to >> do such dispatching. > > Not necessarily; you can instead try each function in turn and use the > first that works. Well, in this case, they'll both "work" but can return incorrect values: `calendar-extract-month' is just implemented as `car', so if I call it on a decoded time, I'll get the seconds slot value rather than the month slot value. Similarly, `decoded-time-second' will return the month if called on a calendar date. If both calendar dates and decoded times were implemented as records/cl-structs, rather than plain lists, then these accessor functions could signal an error if passed a value of the wrong type. But they aren't, and that doesn't seem likely to change anytime soon, so having a predicate seems important. > I have some qualms about saying that decoded times are a "type". Whether > a decoded time is valid depends on the timezone: (0 30 2 10 3 2024 0 t > -21600) is a valid decoded time in Phoenix but not in Denver, because > clocks sprang forward over that time in Denver but not in Phoenix. When > data interpretation gets that complicated, the Emacs notion of "type" is > not always the best. I see. Would it help to change the name, or add some documentation, to make it clear that the predicate doesn't (can't?) test for cases like this? What about calling it something like `decoded-time-like-p' or `maybe-decoded-time-p'? The iCalendar standard sets clear limits on the slot values, but these aren't fine grained enough to rule out cases like the one you gave. All it says is basically: a date-time consists of a year, month, month-day, hour, minute, second, and (possibly) a UTC offset a year is a four digit (positive) integer a month is in the range 1-12 a month-day is in the range 1-28, 1-29, 1-30, or 1-31, depending on the month and year an hour is in the range 0-23 a minute is in the range 0-59 a second is in the range 0-60 (60 represents a leap second) a UTC offset is a sign together with an hour, minute, and second, where the second cannot be 60 So that's what the iCalendar code needs to check for. If it would be better to keep this predicate in the iCalendar code, I can certainly do that. I thought it would be more generally useful and should therefore go with the existing code for decoded times, but maybe I was wrong about that. Best, Richard -------------------- End of forwarded message --------------------
bug-gnu-emacs@HIDDEN:bug#74869; Package emacs.
Full text available.Stefan Kangas <stefankangas@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Received: (at 74869) by debbugs.gnu.org; 29 Dec 2024 19:18:41 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sun Dec 29 14:18:40 2024 Received: from localhost ([127.0.0.1]:56248 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tRyoC-0000Lf-Jl for submit <at> debbugs.gnu.org; Sun, 29 Dec 2024 14:18:40 -0500 Received: from mail.cs.ucla.edu ([131.179.128.66]:49528) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eggert@HIDDEN>) id 1tRyoB-0000LR-1h for 74869 <at> debbugs.gnu.org; Sun, 29 Dec 2024 14:18:39 -0500 Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id BEF063C005176; Sun, 29 Dec 2024 11:18:33 -0800 (PST) Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10032) with ESMTP id 5bNG9tZDcn60; Sun, 29 Dec 2024 11:18:33 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id 7F0713C026D7F; Sun, 29 Dec 2024 11:18:33 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.cs.ucla.edu 7F0713C026D7F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.ucla.edu; s=9D0B346E-2AEB-11ED-9476-E14B719DCE6C; t=1735499913; bh=B5R95gHqVc7v7fMCAiXl/YAbhUp0CNGVHEr6iwp39pQ=; h=Message-ID:Date:MIME-Version:To:From; b=IwMbi9xK0bha5xcNoIGDHEZN4rfe+ataZDrWGUkNnCWxKKVIjF90qSWulM/UDm++O B4K9UOIr6ZOGHNGZoAsQDyo40iMcbLmX/+/EwMdU3eDuwXJ+U6n66g55sjOBhE9d5c ma1JMqtz/nxCeydPnN0MLmu9p+RGR6Our1TT65VBhZ73CbCNUimOs0YIORCXZTJirq /bDmwEKTcOj/NLcco24kopq/mvtr+M3zpsEF81OXE9jLQXY/Gdv60052wZsJlWjLxH Nc5nxwB9vFGx+wpeF4b2XxtXF5H00XpEAuRkVRfkbrJqir5KFrikvwy8XBRwt+yc2j bDTycyKAYpQCQ== X-Virus-Scanned: amavis at mail.cs.ucla.edu Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10026) with ESMTP id opntULYYUG9F; Sun, 29 Dec 2024 11:18:33 -0800 (PST) Received: from [192.168.0.102] (unknown [47.154.28.214]) by mail.cs.ucla.edu (Postfix) with ESMTPSA id 577A63C005176; Sun, 29 Dec 2024 11:18:33 -0800 (PST) Message-ID: <7be82ecf-0d4f-488a-94ae-3f39fe886edb@HIDDEN> Date: Sun, 29 Dec 2024 11:18:33 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Fwd: [PATCH] Add predicates for decoded times and time deltas Content-Language: en-US References: <e6537a9d-3f74-46a0-9bbd-ef63d045f4c2@HIDDEN> To: 74869 <at> debbugs.gnu.org From: Paul Eggert <eggert@HIDDEN> In-Reply-To: <e6537a9d-3f74-46a0-9bbd-ef63d045f4c2@HIDDEN> X-Forwarded-Message-Id: <e6537a9d-3f74-46a0-9bbd-ef63d045f4c2@HIDDEN> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 74869 Cc: Richard Lawrence <rwl@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Forwarding another mis-addressed email of mine. -------- Forwarded Message -------- Subject: Re: [PATCH] Add predicates for decoded times and time deltas Date: Sat, 28 Dec 2024 09:26:23 -0800 From: Paul Eggert <eggert@HIDDEN> To: Richard Lawrence <rwl@HIDDEN> CC: 74689 <at> debbugs.gnu.org On 12/28/24 07:56, Richard Lawrence wrote: > I need to use > `calendar-extract-month' with a plain date value, but > `decoded-time-month' with a date-time value. I need type predicates to > do such dispatching. Not necessarily; you can instead try each function in turn and use the first that works. I have some qualms about saying that decoded times are a "type". Whether a decoded time is valid depends on the timezone: (0 30 2 10 3 2024 0 t -21600) is a valid decoded time in Phoenix but not in Denver, because clocks sprang forward over that time in Denver but not in Phoenix. When data interpretation gets that complicated, the Emacs notion of "type" is not always the best.
bug-gnu-emacs@HIDDEN:bug#74869; Package emacs.
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bug-gnu-emacs@HIDDEN:bug#74869; Package emacs.
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Sat, 14 Dec 2024 11:11:48 -0500 (EST) From: Richard Lawrence <rwl@HIDDEN> To: bug-gnu-emacs@HIDDEN Subject: [PATCH] Add predicates for decoded times and time deltas Date: Sat, 14 Dec 2024 17:11:41 +0100 Message-ID: <8734iqp7lu.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="=-=-=" Received-SPF: pass client-ip=202.12.124.152; envelope-from=rwl@HIDDEN; helo=fhigh-b1-smtp.messagingengine.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_PASS=-0.001, T_SPF_HELO_TEMPERROR=0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -1.6 (-) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -2.6 (--) --=-=-= Content-Type: text/plain Tags: patch This is a rough draft of a patch to add two new predicates related to decoded times: `decoded-time-p', which checks that a value is a decoded time (as documented in `decode-time'), and `decoded-time-delta-p', which checks that a value is a time delta (as documented in `decoded-time-add'). Some questions: 1) Should these functions go in simple.el? I put them there because that is where the structure definition for decoded-time is. (The definition does not generate a predicate automatically because it uses :type but not :named; see Info node `(cl)Structures'.) But at least `decoded-time-delta-p' might be better off in time-date.el, which is where `decoded-time-add' is defined. 2) Should `decoded-time-p' also check the weekday slot of decoded times? See the FIXME comment in the middle of the function: `make-decoded-time' neither sets this slot nor provides an argument to let the caller set it. This is apparently intentional: there is a comment in the definition of `make-decoded-time', ;; Do not set decoded-time-weekday or decoded-time-dst, ;; as encode-time can infer them well enough when unknown. but if the slot is not meant to be set I don't understand why it's there. It would be useful, for iCalendar purposes, to have the weekday slot automatically calculated from the date values when a decoded time is constructed. I'm not sure if this use was just not envisioned, or if there was a more substantial reason not to do it in make-decoded-time. Hopefully I got the commit message right this time, but please let me know if that needs tweaking too... Best, Richard --=-=-= Content-Type: text/patch Content-Disposition: attachment; filename=0001-Add-predicates-for-decoded-times-and-time-deltas.patch From a9075f0dc459c1b3b0c3d2e4b7eb33553d7adac9 Mon Sep 17 00:00:00 2001 From: Richard Lawrence <rwl@HIDDEN> Date: Sat, 14 Dec 2024 16:36:45 +0100 Subject: [PATCH] Add predicates for decoded times and time deltas * lisp/simple.el (decoded-time-p): Add predicate for decoded times. * lisp/simple.el (decoded-time-delta-p): Add predicate for time deltas. --- lisp/simple.el | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/lisp/simple.el b/lisp/simple.el index f2ee4a5df67..ac06a49402f 100644 --- a/lisp/simple.el +++ b/lisp/simple.el @@ -11228,6 +11228,41 @@ capitalize-dwim the number of seconds east of Greenwich.") ) +(defun decoded-time-p (val) + "Return non-nil if VAL is a decoded time. +See `decode-time' for the expected format of VAL." + (and (listp val) + (length= val 9 + ;; TODO: according to `decode-time', sec can also be a "Lisp + ;; timestamp"...is there a predicate for that? + (cl-typep (decoded-time-second val) '(integer 0 60)) + (cl-typep (decoded-time-minute val) '(integer 0 59)) + (cl-typep (decoded-time-hour val) '(integer 0 23)) + (cl-typep (decoded-time-day val) '(integer 1 31)) + ;; FIXME: the weekday slot value should ideally be automatically + ;; calculated from month, day, and year on construction, like: + ;; (calendar-day-of-week (list month day year)) + ;; `make-decoded-time' does not do this at present, and also has no + ;; option to set the weekday slot. + ;; (cl-typep (decoded-time-weekday val) '(integer 0 6)) + (cl-typep (decoded-time-month val) '(integer 1 12)) + (cl-typep (decoded-time-year val) 'integer) + (cl-typep (decoded-time-dst val) '(member t nil -1)) + (cl-typep (decoded-time-zone val) '(or integer null))))) + +(defun decoded-time-delta-p (val) + "Return non-nil if VAL is a decoded time delta of the sort required by +`decoded-time-add'." + (and (listp val) + (length= val 9) + ;; weekday, dst, zone can be ignored + (cl-typep (decoded-time-second val) '(or null integer)) + (cl-typep (decoded-time-minute val) '(or null integer)) + (cl-typep (decoded-time-hour val) '(or null integer)) + (cl-typep (decoded-time-day val) '(or null integer)) + (cl-typep (decoded-time-month val) '(or null integer)) + (cl-typep (decoded-time-year val) '(or null integer)))) + ;; Document that decoded-time-dst is problematic on 6-element lists. ;; It should return -1 indicating unknown DST, but currently returns ;; nil indicating standard time. -- 2.39.5 --=-=-=--
Richard Lawrence <rwl@HIDDEN>:bug-gnu-emacs@HIDDEN.
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