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<dre>
oh my gosh guys
<dre>
i had a ~brainwave~
<dre>
at work in python land, I wrote a function that is just a one-line return
<dre>
return { set comprehension } *
<dre>
and someone asked me about it and I said "the function is basically a documenting label to the set comprehension"
<jcowan>
I think that requiring SORT to support both lists and :start :end would be obnoxious.
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<dre>
is that why CL uses `labels` as defining functions? you're literally labelling some lisp forms as their own little name thing
<hayley>
I recall gilberth mentioned it was a reference to "labels" in assembly, especially when you consider tail-calling to be jumping.
<hayley>
JMC's original LISP used the singular LABEL to introduce self-reference still.
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<dre>
oh that makes better sense
<dre>
sorry I'm really dumb :P
<dre>
I sometimes find the CL naming to be a little bit difficult but that's just my newbiness
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<jcowan>
dre: Everyone agrees that CL naming is unsystematic.
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<aeth>
When CL has better names than Scheme, it's accidental. e.g. CL:MAP is better because the generic name was available, but Scheme already renamed MAPCAR to MAP.
<hayley>
MAPCAR implies the existence of MAPCDR
<aeth>
CL also contains a lot of legacy, e.g. SET, SETQ, SETF
<aeth>
hayley: why stop there when you can have MAPCADR?
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<an_origamian>
MAPCADDAR
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<kakuhen>
MAPNTH
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<fiddlerwoaroof>
SORT on a displaced array probably has an undefined effect on the underlying array
<fiddlerwoaroof>
Kills two arrays with one FUNCALL
<fiddlerwoaroof>
Although I can't actually find the language in the standard that says this
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<aeth>
(defun mapeven (function list) (loop :for item :in list :for evenp := t :then (not evenp) :when evenp :collect (funcall function item)))
<an_origamian>
beach: I am. I'm pretty new to IRC as well.
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<phantomics>
Is there a reason I can't alter lists that are properties of objects? For example...
<phantomics>
If I do this: (setf bbb nil) (setf (getf bbb :cc) (list :ee)) (setf (getf (rest (getf bbb :cc)) :ii) 10)
<phantomics>
I will get my expected output, (:CC (:EE :II 10))
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<phantomics>
However, if bbb is replaced with (obj-plist myobject), where obj-plist is the list accessor for the class of myobject, then the list does not get changed
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<beach>
Works for me.
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<phantomics>
Ok, must be missing something somewhere down the line
<pjb>
phantomics: this is not a valid p-list: (progn (setf bbb nil) (setf (getf bbb :cc) (list :ee)) (setf (getf (rest (getf bbb :cc)) :ii) 10) (getf bbb :cc)) #| --> (:ee :ii 10) |#
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<pjb>
Sorry, I'm confused. I need to wake up.
<verisimilitude>
Why would it, fiddlerwoaroof?
<phantomics>
pbj: it's not, but the (rest) of it is
<phantomics>
That way it can be passed to various places and it'll share the same storage everywhere including newly added properties
<beach>
phantomics: Can you show the code that doesn't work?
<beach>
phantomics: Also, you need to create bbb before assigning to it.
<phantomics>
Ok, I'll paste it. I did (defvar bbb) before the code above
<beach>
OK.
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<phantomics>
Here it is, should be somewhat clear. The shape-of method populates a metadata slot that's part of an object, while the render method attempts to modify a part of the metadata
<phantomics>
I've also tried (setf (getf (rest (getf (varray-meta varray) :gen-meta)) :index-width) stuff) and that doesn't work either, (varray-meta) is the accessor for the metadata slot
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<beach>
I just meant the same two lines but with the replacement you mentioned.
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<phantomics>
Ok, I figured it out, I was running something that overwrote the metadata that got reassigned
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<beach>
I see.
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<beach>
phantomics: By the way, the indentation on that page is messed up, so either your code contains TABs, or it is incorrectly indented.
<phantomics>
I've noticed that the recent version of Emacs I had does indenting in a different way
<phantomics>
Like the alignment of clauses in (loop), has anyone else noticed this?
<beach>
I take that back. The second time I loaded it, it looks better.
<beach>
For LOOP I use the slime-indentation contribution which is basically required for it to be right.
<phantomics>
Are the :for and :collect in the loop clauses toward the bottom supposed to be aligned? In older Emacs the :for would be further left
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<beach>
Yes, they should be aligned and they are.
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<beach>
I would put the clause starting with :when on a new line.
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<verisimilitude>
I just manually align the LOOPs I write.
<verisimilitude>
I don't specially align any clauses, however.
<beach>
Oh, that's bad.
<beach>
Both.
<beach>
If you submit code that is manually aligned, that means the person reading it can't trust the indentation, so you force that person to count parentheses.
<beach>
But maybe you don't submit your code.
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<verisimilitude>
Maybe I don't submit my code to whom?
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<pjb>
verisimilitude: to the open source gods.
<beach>
verisimilitude: Anyone you might collaborate with, or ask for help or advice.
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<verisimilitude>
I work alone, so no I don't have that issue.
<beach>
Fair enough.
<verisimilitude>
Regardless, no indentation can be trusted, because these programs are unfortunately distributed as text files.
<beach>
So we should all count parentheses?
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<verisimilitude>
I have my computer count parentheses for me.
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<verisimilitude>
I don't generally read Lisp code I didn't write, anyway.
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<fiddlerwoaroof>
verisimilitude: I was under the impression that there was a clause along the lines of "the user must use the return value of SORT" in the standard and that the state of the input sequence was undefined after SORT exits
<verisimilitude>
I believe I checked for just that before I wrote the implementation of grade I shared earlier, because it also occurred to me.
<jackdaniel>
fiddlerwoaroof: basically yes ("The sorting operation can be destructive in all cases. In the case of a vector argument, this is accomplished by permuting the elements in place. In the case of a list, the list is destructively reordered in the same manner as for nreverse. " - from the standard)
<fiddlerwoaroof>
Yeah, although if you're assuming a vector, I think it's safe to assume the input sequence hasn't been ruined?
<fiddlerwoaroof>
For lists, this clause in NREVERSE seems to apply: "The result might or might not be identical to sequence"
<jackdaniel>
right, in case of a vector the imaginary "head" never changes
<acma>
SLIME indents the LOOP clauses correctly anyway, so never had to bother about taking special care myself to indent them
<jackdaniel>
in case of nreverse and co the head may end up in the middle of the sequence, so the new head is in a different place (so the old variable may reference a cons that is in not at the beginning of the sequence)
<beach>
acma: As I recall, it has to do with slime-indentation being the default, but perhaps it did not use to be.
<jackdaniel>
(in case of nreverse it will be probably at the end of the sequence, not the middle of course)
<acma>
how can I check if slime-indentation is enabled in my editor?
<beach>
Beats me. Sorry.
<fiddlerwoaroof>
jackdaniel: that only applies to lists, though
<jackdaniel>
yes, I've said that (and agreed with you) above
<fiddlerwoaroof>
The standard seems to restrict operations on vectors to reordering items, in both cases
<fiddlerwoaroof>
Sorry, missed that :)
<jackdaniel>
no worries
<jackdaniel>
that said all depends on your definition of being "ruined" - sometimes you don't want to modify the original sequence order (in this case a vector)
<jackdaniel>
then calling sort on it may be undesired, because the original order will be ruined
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<Josh_2>
Good Morning :sunglasses:
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<gamaliel>
Hi, I'm relatively new to Lisp, and was wondering if there was some way to wrap docstrings when documenting my functions. For now I am using (concatenate 'string "<doc-piece1>" ... "<doc-piece-n>") and it seems awfully clunky.
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<beach>
gamaliel: And it won't work, because docstrings are not evaluated.
<Bike>
like linebreaks? you can just put them in the string
<Bike>
"This function does bla bla bla [newline goes here] and such and such"
<gamaliel>
@Bike: I tried it, but it doesn't seem to allow it. I am using paredit-mode.
<Bike>
Doesn't allow it how?
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<gamaliel>
Sorry, I meant, it places the cursor directly on the first column of the code after the newline instead of respecting the indentation of the previous line.
<gamaliel>
So, if I start on the 8th space to write my docstring, placing newline moves the rest of the docstring to the 1st space.
<semz>
if you want to get rid of the linebreaks entirely for aesthetic reasons or want to indent your docstrings in the source without that showing up in the docstring itself, you could do #.(format nil "your docstring here~<newline> bottom text"), which results in "your docstring herebottom text".
<semz>
~<newline> is a format command that ignores the newline and all whitespace at the beginning of the next line
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<gamaliel>
Ok, so to be clear, for writing a docstring I'd wrap it around #.(format nil "<my-docstring-text-piece1>~<newline><my-doc-string-text-piece2>") and add enters, spaces, etc. for manually indenting. Format would then take care of eliminating all extra space.
<_death>
gamaliel: the indentation makes sense, because the text starts after the first double quote
<edgar-rft>
gamalie: If you start the doctring on the 8th space in your code and also indent all following lines in the docstring by 8 spaces, then when the docstring gets printed the first line will start at line position 0 (because the docstring starts with the double quotes) and all subsequent lines will be printed with an indentation of 8 spaces. This is probably not what you want.
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<semz>
gamaliel: Pretty much, although keep in mind that ~<newline> by itself won't add a space between the concatenated pieces (you'd have to put one before the ~<newline>). You can test this without the #. in the REPL, it's just a format call after all
<semz>
actually I suppose you can test it with the #. in the REPL as well, it makes no difference
<beach>
gamaliel: The ~@<newline> FORMAT directive means that initial space on the next line is ignored, so the lines of the documentation string are aligned in the left column even though the lines in the code are indented.
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<_death>
beach: what's the point of using #. there?
<beach>
Not much.
<beach>
Good point.
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<gamaliel>
It seems to do the trick for now. Thank you all.
<beach>
Pleasure.
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<fiddlerwoaroof>
I recently used a function to trim leading whitespace up to a sentinel character in docstrings
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<pjb>
gamaliel: when I type ( d e f u n SPC foo SPC ( ) RET " h e l l o RET I get: https://termbin.com/g2aju with | being the cursor.
<pjb>
gamaliel: If typing RET on the closing " gets you out of the string, then you could use instead C-q C-j to insert a newline.
<pjb>
gamaliel: But it would mean you have misconfigured your buffer.
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<b3lm0nt_>
Question: does anyone here using Vim + Vlime + SBCL successfully on OpenBSD? i've been using that combination on my Macbook Pro just fine, but on OpenBSD I have an issues where the sldb debugger doesn't work (no sldb buffer opens when an error occurs).
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