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Sun, 29 May 2022 18:55:39 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.7.0-alpha0-591-gfe6c3a2700-fm-20220427.001-gfe6c3a27 Mime-Version: 1.0 Message-Id: <41f13468-b9b9-4b64-845a-aadbcc3b8472@www.fastmail.com> In-Reply-To: References: <20220525025403.GA97860@zira.vinc17.org> <20220525084920.GB97860@zira.vinc17.org> <20220526143602.GA1236826@zira.vinc17.org> <20220526155329.GF19001@tarpaulin.shahaf.local2> <1936193667.415066.1653581604546@mail2.virginmedia.com> <20220528000720.GB1236826@zira.vinc17.org> <20220528100639.GB29128@tarpaulin.shahaf.local2> Date: Sun, 29 May 2022 22:55:18 +0000 From: "Daniel Shahaf" To: "Zsh Users" Subject: Re: prevent some lines directly coming from the history from being executed Content-Type: multipart/mixed; boundary=4ebbaa244088437da8e4c896a485f354 X-Seq: 27822 Archived-At: X-Loop: zsh-users@zsh.org Errors-To: zsh-users-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-users-request@zsh.org X-no-archive: yes List-Id: List-Help: List-Subscribe: List-Unsubscribe: List-Post: List-Owner: List-Archive: --4ebbaa244088437da8e4c896a485f354 Content-Type: text/plain Bart Schaefer wrote on Sat, 28 May 2022 18:43 +00:00: > On Sat, May 28, 2022 at 3:06 AM Daniel Shahaf wrote: >> +cindex(widgets, shadowing standard) > > "Shadow(ing)" is not a term I'd think to search for in this context. > Wrap, override, overload, replace, re-implement, ...? > Most of these terms imply particular semantics (e.g., "wrap" implies the new definition calls the old one). I think "shadow" is the right term here, so how about: +cindex(widgets, shadowing standard) +cindex(widgets, overriding standard) +User-defined widgets may shadow (override) standard widgets: for instance, >> +However, each standard widget `var(foo)' is also available under the >> +name `tt(.)var(foo)', and this name can't be rebound to a different widget. > > I would probably have used something like var(std) or even > var(stdwidg) here, but that's a nit. > Personally I find it easier to read with "foo", but I suppose that's a matter of taste. I'll write it whichever way is the house style. >> +Therefore, for forward compatibility with future versions of the shell, >> +it is recommended that user-defined widgets should not have names >> starting with `tt(.)'. > > It's actually prohibited to name a user-defined widget the same as one > of the reserved dot-names, so this recommendation could be more > specific. > OK, can spell out the problem. Wouldn't that make the paragraph a bit of a wall of text, though? Also, it would further break the flow (example, recommendation, rationale of the recommendation, continuation of example). That flow was one of the things that I wasn't happy about regarding the v1 of the patch. +Therefore, for forward compatibility with future versions of the shell, +it is recommended that user-defined widgets should not have names -starting with `tt(.)'. +starting with `tt(.)'. (If a user-defined widget is named `tt(.)var(some-name)' +and a future version of the shell introduces a built-in `var(some-name)' widget, +the user-defined widget's definition will raise an error under that future +version of the shell.) >> +then tt(myfunc) would have been called again, effecting a bottomless >> +recursion. > > Perhaps my old-fogey-ness (or USA-centrism) is showing, but I've never > seen the word "bottomless" used in this context before, only > "infinite" or more rarely "endless". Another nit, as it doesn't > really change the clarity, just mentioning because I found it curious. Prior art: (1995) https://github.com/freebsd/freebsd-src/commit/cd02a0b741846be432ea4646890e617c8c3b445d (2003) https://www.freebsd.org/cgi/man.cgi?query=exit&apropos=0&sektion=3&manpath=FreeBSD+5.0-RELEASE&arch=default&format=html It does seem to be rather rare, though. Thanks for the review! Daniel --4ebbaa244088437da8e4c896a485f354 Content-Disposition: attachment;filename="v2.txt" Content-Type: text/plain; name="v2.txt" Content-Transfer-Encoding: BASE64 LS0tIGEvRG9jL1pzaC96bGUueW8KKysrIGIvRG9jL1pzaC96bGUueW8KQEAgLTc0NiwxNyAr NzQ2LDQ2IEBAIGlmbnptYW4obm9kZXJlZihTdGFuZGFyZCBXaWRnZXRzKSkuCiBPdGhlciBi dWlsdC1pbiB3aWRnZXRzIGNhbiBiZSBkZWZpbmVkIGJ5IG90aGVyIG1vZHVsZXMgKHNlZQog aWZ6bWFuKHptYW5yZWYoenNobW9kdWxlcykpXAogaWZuem1hbihub2RlcmVmKFpzaCBNb2R1 bGVzKSlcCi0pLiAgRWFjaCBidWlsdC1pbiB3aWRnZXQgaGFzIHR3byBuYW1lczogaXRzIG5v cm1hbCBjYW5vbmljYWwgbmFtZSwgYW5kIHRoZQotc2FtZSBuYW1lIHByZWNlZGVkIGJ5IGEg YHR0KC4pJy4gIFRoZSBgdHQoLiknIG5hbWUgaXMgc3BlY2lhbDogaXQgY2FuJ3QgYmUKLXJl Ym91bmQgdG8gYSBkaWZmZXJlbnQgd2lkZ2V0LiAgVGhpcyBtYWtlcyB0aGUgd2lkZ2V0IGF2 YWlsYWJsZSBldmVuIHdoZW4KLWl0cyB1c3VhbCBuYW1lIGhhcyBiZWVuIHJlZGVmaW5lZC4K KykuCiAKIFVzZXItZGVmaW5lZCB3aWRnZXRzIGFyZSBkZWZpbmVkIHVzaW5nIGB0dCh6bGUg LU4pJywgYW5kIGltcGxlbWVudGVkCiBhcyBzaGVsbCBmdW5jdGlvbnMuICBXaGVuIHRoZSB3 aWRnZXQgaXMgZXhlY3V0ZWQsIHRoZSBjb3JyZXNwb25kaW5nCiBzaGVsbCBmdW5jdGlvbiBp cyBleGVjdXRlZCwgYW5kIGNhbiBwZXJmb3JtIGVkaXRpbmcgKG9yIG90aGVyKSBhY3Rpb25z LgotSXQgaXMgcmVjb21tZW5kZWQgdGhhdCB1c2VyLWRlZmluZWQgd2lkZ2V0cyBzaG91bGQg bm90IGhhdmUgbmFtZXMKKworY2luZGV4KHdpZGdldHMsIHNoYWRvd2luZyBzdGFuZGFyZCkK K2NpbmRleCh3aWRnZXRzLCBvdmVycmlkaW5nIHN0YW5kYXJkKQorVXNlci1kZWZpbmVkIHdp ZGdldHMgbWF5IHNoYWRvdyAob3ZlcnJpZGUpIHN0YW5kYXJkIHdpZGdldHM6IGZvciBpbnN0 YW5jZSwKK2FmdGVyIGB0dCh6bGUgLU4gc2VsZi1pbnNlcnQgbXlmdW5jKScsIGFueSBpbnZv Y2F0aW9uIG9mIHRoZSBzdGFuZGFyZAordHQoc2VsZi1pbnNlcnQpIHdpZGdldCAoaW5jbHVk aW5nIGV2ZXJ5IGtleXByZXNzIHRoYXQgYXBwZW5kcyBhbiBhbHBoYW51bWVyaWMKK29yIHNw YWNlIGNoYXJhY3RlciB0byB0aGUgY29tbWFuZCBsaW5lKSB3b3VsZCBpbnZva2UgdGhlIHVz ZXItZGVmaW5lZAorZnVuY3Rpb24gdHQobXlmdW5jKSByYXRoZXIgdGhhbiB0aGUgc3RhbmRh cmQgaW1wbGVtZW50YXRpb24gb2YgdGhhdCB3aWRnZXQuCitIb3dldmVyLCBlYWNoIHN0YW5k YXJkIHdpZGdldCBgdmFyKGZvbyknIGlzIGFsc28gYXZhaWxhYmxlIHVuZGVyIHRoZQorbmFt ZSBgdHQoLil2YXIoZm9vKScsIGFuZCB0aGlzIG5hbWUgY2FuJ3QgYmUgcmVib3VuZCB0byBh IGRpZmZlcmVudCB3aWRnZXQuCitUaGlzIG1ha2VzIHRoZSBzdGFuZGFyZCB3aWRnZXQgYXZh aWxhYmxlIHRvIGJlIGNhbGxlZCBvciBib3VuZCBldmVuIHdoZW4KK2l0cyB1c3VhbCBuYW1l IGhhcyBiZWVuIHJlZGVmaW5lZC4KK1RoZXJlZm9yZSwgZm9yIGZvcndhcmQgY29tcGF0aWJp bGl0eSB3aXRoIGZ1dHVyZSB2ZXJzaW9ucyBvZiB0aGUgc2hlbGwsCitpdCBpcyByZWNvbW1l bmRlZCB0aGF0IHVzZXItZGVmaW5lZCB3aWRnZXRzIHNob3VsZCBub3QgaGF2ZSBuYW1lcwot c3RhcnRpbmcgd2l0aCBgdHQoLiknLgorc3RhcnRpbmcgd2l0aCBgdHQoLiknLiAgKElmIGEg dXNlci1kZWZpbmVkIHdpZGdldCBpcyBuYW1lZCBgdHQoLil2YXIoc29tZS1uYW1lKScKK2Fu ZCBhIGZ1dHVyZSB2ZXJzaW9uIG9mIHRoZSBzaGVsbCBpbnRyb2R1Y2VzIGEgYnVpbHQtaW4g YHZhcihzb21lLW5hbWUpJyB3aWRnZXQsCit0aGUgdXNlci1kZWZpbmVkIHdpZGdldCdzIGRl ZmluaXRpb24gd2lsbCByYWlzZSBhbiBlcnJvciB1bmRlciB0aGF0IGZ1dHVyZQordmVyc2lv biBvZiB0aGUgc2hlbGwuKQogCitDb250aW51aW5nIHRoZSBleGFtcGxlLCB0dChteWZ1bmMp IHdvdWxkIHR5cGljYWxseSBpbnZva2UgdGhlIGJ1aWx0LWluIHdpZGdldAoraXQgaXMgcmVw bGFjaW5nIHVzaW5nIHRoZSBkb3QtcHJlZml4IHN5bnRheDoKKworZXhhbXBsZSh6bGUgLU4g c2VsZi1pbnNlcnQgbXlmdW5jCitteWZ1bmMrTFBBUigpK1JQQVIoKSB7CisgIFtbICRLRVlT ID09IFthZWlvdV0gXV0gJiYgemxlIC5zZWxmLWluc2VydCAtLSAiJEAiCisgIHpsZSAuc2Vs Zi1pbnNlcnQgLS0gIiRAIiAKK30pCisKK1RoaXMgZXhhbXBsZSBjYXVzZXMgdm93ZWxzIHRv IGJlIGluc2VydGVkIHR3aWNlLgorCitOb3RlIHRoZSB1c2Ugb2YgdGhlIGRvdC1wcmVmaXgg c3ludGF4LiAgSWYgdGhlIHR0KHNlbGYtaW5zZXJ0KSB3aWRnZXQgaGFkIGJlZW4KK2ludm9r ZWQgd2l0aG91dCB0aGUgZG90IERBU0goKS0gdGhhdCBpcywgYXMgYHR0KHpsZSBzZWxmLWlu c2VydCAtLSAiJEAiKScgREFTSCgpLQordGhlbiB0dChteWZ1bmMpIHdvdWxkIGhhdmUgYmVl biBjYWxsZWQgYWdhaW4sIGVmZmVjdGluZyBhIGJvdHRvbWxlc3MKK3JlY3Vyc2lvbi4KKwog dGV4aW5vZGUoVXNlci1EZWZpbmVkIFdpZGdldHMpKFN0YW5kYXJkIFdpZGdldHMpKFpsZSBX aWRnZXRzKShac2ggTGluZSBFZGl0b3IpCiBzZWN0KFVzZXItRGVmaW5lZCBXaWRnZXRzKQog Y2luZGV4KHdpZGdldHMsIHVzZXItZGVmaW5lZCkK --4ebbaa244088437da8e4c896a485f354--