#commonlisp on 2023-05-22 — irc logs at libera.irclog.whitequark.org

2022-07-28 16:55 jackdaniel changed the topic of #commonlisp to: Common Lisp, the #1=(programmable . #1#) programming language | Wiki: <https://www.cliki.net> | IRC Logs: <https://irclog.tymoon.eu/libera/%23commonlisp> | Cookbook: <https://lispcookbook.github.io/cl-cookbook> | Pastebin: <https://plaster.tymoon.eu/>

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10:17 <mi6x3m> hey friends, how can I setf a symbol that holds a variable's name?

10:18 <mi6x3m> (defvar *foo* 5), i have (let ((foo '*foo*)) (setf ... 5)) ?

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10:20 <scymtym> mi6x3m: (let ((foo '*foo*)) (setf (symbol-value foo) 10))

10:22 <mi6x3m> thanks!!

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10:26 <edgar-rft> not sure if it's a good idea, but isn't that what SET is for? like (let ((foo '*foo*)) (set foo 10))

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10:27 <beach> Yes, it's probably better, even though it is indicated as deprecated.

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10:57 <mi6x3m> hmmm

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11:33 <mi6x3m> sorry, it's me again with the symbol-value questions

11:34 <mi6x3m> I can't get it to work

11:34 <mi6x3m> do I need to prepend the symbols with the package I am in-package'd in?

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11:36 <White_Flame> any unadorned symbol which was read into the same current package will be the exact same EQ symbol

11:37 <White_Flame> but if you're doing stuff across multiple packages, it can't hurt to try

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11:44 <pve> mi6x3m: perhaps use https://plaster.tymoon.eu to show what you have so far

11:45 <mi6x3m> hmm, I get the value of '*foo* is not a symbol

11:45 <mi6x3m> but i defineit with (defvar *foo* 3)

11:46 <mi6x3m> how do I get a symbol of *foo*?

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11:47 <jackdaniel> what makes you think that the value of '*foo* is not a symbol?

11:47 <jackdaniel> CL-USER> (type-of '*foo*) ; -> SYMBOL

11:48 <mi6x3m> OK something very weird is going on

11:48 <mi6x3m> symbol-value exists with '*foo* is not of type SYMBOL

11:49 <jackdaniel> CL-USER> (defvar *foo* 42) ; -> *FOO*

11:49 <jackdaniel> CL-USER> (symbol-value '*foo*) ; -> 42

11:50 <jackdaniel> ,(progn (defvar *foo* 42) (symbol-value '*foo*))

11:50 <ixelp> (progn (defvar *foo* 42) (symbol-value '*foo*)) => 42

11:51 <jackdaniel> pve: had an excellent suggestion, paste a minimized example of whatever it is that doesn't work for you

11:51 <jackdaniel> (on plaster.tymoon.eu)

11:51 <mi6x3m> ok found it out

11:51 <jackdaniel> s/pve:/pve/

11:51 <mi6x3m> what i was actually needing was SETQ

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11:55 <mi6x3m> no that's not it too

11:55 <mi6x3m> damn

11:56 <pve> mi6x3m: if you show the code, you will receive an answer in approximately one nanosecond :)

11:57 <yitzi> And often constructive suggestions about other/better ways to accomplish your task.

11:59 <mi6x3m> pve I am trying, the weird thing is it works in the REPL

11:59 <mi6x3m> just gimme a few =) you friends are indeed always quick and helpful!

11:59 <jackdaniel> you are trying to paste it on the pastebin?

11:59 <jackdaniel> why doesn't the pastebin work?

11:59 <Shinmera> https://github.com/lem-project/lem/releases/tag/v2.0.0

12:00 <ixelp> Release v2.0.0 · lem-project/lem · GitHub

12:00 <Shinmera> Dang, nice

12:00 <mi6x3m> OK I get it

12:00 <mi6x3m> i am SO STUPID

12:00 <mi6x3m> I was quouting in an already quoted list

12:01 <jackdaniel> mi6x3m: are you listening what people actually ask you to do?

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12:01 <mi6x3m> yes jackdaniel :)

12:01 <mi6x3m> sometimes it's hard to provide a sample

12:01 <jackdaniel> I have a strong conviction that you are not

12:02 <mi6x3m> I understand it appears that way from this one interaction

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12:02 <mi6x3m> but I did solve it now

12:02 <pve> your very first error message "the value of '*foo* is not a symbol" gave it away :)

12:03 <mi6x3m> I had (destructuring-bind (foo bar) '("foo" '*foo*)) (setf (symbol-value bar) 3))

12:03 <mi6x3m> pve, yeah hehe :)

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12:08 <jackdaniel> Shinmera: very cool indeed. do you use lem?

12:09 <Shinmera> I'm not very adventurous in my tool use, so no

12:09 <Shinmera> But if the project keeps trucking along as well as it has so far I very well might in the future :)

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12:11 <pve> Speaking of conditions, SBCL signals a warning when a defpackage form is evaluated and the package exports symbols that are not specified by the defpackage form ("WARNING: ... also exports the following symbols: ...").

12:11 <pve> My tests show that CCL does not signal such a warning. Is this unique to SBCL, or do other implementations also do this?

12:12 <jackdaniel> it is a warning that sbcl devs found to be an important clue to the programmer, it is not demanded by the standard

12:12 <pve> ok, thanks

12:13 <jackdaniel> sure

12:13 <pve> does ECL do it?

12:13 <jackdaniel> I don't remember, but I'd be surprised if it did

12:13 <pve> alright

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13:51 <scymtym> the reason for SBCL's default behavior is that the specification says "If the new definition is at variance with the current state of that package, the consequences are undefined". the behavior can be customized: https://www.sbcl.org/manual/#Package-Variance

13:51 <ixelp> SBCL 2.3.4 User Manual

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13:54 <scymtym> counterintuitively, requesting the :ERROR behavior makes it easier for a compilation to succeed since restarts for (interactively) resolving the variance issues are established when an error is signaled but not when a warning is signaled

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14:53 <Demosthenex> https://github.com/gansm/finalcut looks so good, i may have to learn more about doing FFI in CL so i can use it

14:53 <ixelp> GitHub - gansm/finalcut: A text-based widget toolkit

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15:27 <_death> Demosthenex: reminds me of the old norton anti virus TUI

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15:31 <_death> or cpav really

15:31 <Demosthenex> _death: or Turbovision ;]

15:32 <Demosthenex> and that's really what i want, is a lightweight TUI library for simple apps over ssh ;]

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15:38 <_death> right, I was talking about the aesthetics.. for turbovision there was https://github.com/magiblot/tvision .. my old TUI thing is still in deep freeze

15:38 <ixelp> GitHub - magiblot/tvision: A modern port of Turbo Vision 2.0, the classical framework for text-based user interfaces. No [...]

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15:50 <Demosthenex> yep

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16:57 <phoe> pve: use UIOP:DEFINE-PACKAGE to avoid this warning since it also defines what happens in case of package variance

16:57 <phoe> (in a way that doesn't require interactive interventions such as restarts)

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17:39 <pve> phoe: Thanks for reminding me about uiop:define-package. This is about my capitalized-export library, which is pretty incompatible with sbcl's defpackage :) So with sbcl I just use make-package. But I'm going to add a note that the uiop version could be used too.

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