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<ellis>
sup yall
<ellis>
coming from the CL world, taking a first look at picolisp is striking fear into my heart
<ellis>
can someone help me understand a practical use-case for transient symbols for example?
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<pablo_escoberg>
You can safely think of transient symbols as stings in most languages.
<ellis>
yes but in picolisp you can also 'unsafely' think of them as other things (the value bound to it)
<aw->
hi ellis
<ellis>
hello!
<pablo_escoberg>
ellis: Yeah, you can bind values to transient symbols. It's a good idea under certain circumstances, but I personally avoid it.
<aw->
transient symbols can be seen as symbols that disappear when they're not in use anymore
<aw->
so if you have a list '(One Two "Three") then "Three" is a transient symbol
<pablo_escoberg>
that might be a safer way to think of it :).
<ellis>
ohh it is within the context of the special quote context? (or something of the sort)
<aw->
or something, I think my explanation isn't exactly correct
<aw->
what are you trying to do?
<pablo_escoberg>
There's no quote context that I know of.
<ellis>
im just trying to understand :P - maybe there's some better examples of its usage out there
<pablo_escoberg>
for now, wherever you need a string literal, use a transient symbol. As you look at some of the code in the standard distribution, you'll find cases where they're used to store values. You'll probably never need to do this yourself, but bear in mind there are cases where it's helpful and you'll see it in code sometimes.
<abu[7]>
Technically, transients are symbols currently not found in any namespace
<abu[7]>
A symbol may be interned in a namespace which is not in the current search order, then it is also transient at that moment
<abu[7]>
In effect, a symbol prints with double quotes if it is not found in the search order
<abu[7]>
When *reading*, double quotes cause a symbol *not* to be interned in the current namespace, but only in the transient namespace which has a file-local scope
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<geri>
hey, is there an official way to pipe a whole file into (pp)?
<abu[7]>
Something like (while (read) (pretty @) (prinl))
<geri>
yeah that
<geri>
thanks
<geri>
oh wait, read doesnt eval anything either, it just reads until end of expression and returns as-is?
<abu[7]>
It does eval read-macros
<geri>
ah
<abu[7]>
'read' reads a *single* exe
<geri>
(de ... ) is a single expression with a bunch nested in, no?
<abu[7]>
Yes, 1 exe
<geri>
why "exe"?
<abu[7]>
(de sym . any)
<abu[7]>
exe is a type
<abu[7]>
see doc/ref.html
<abu[7]>
distinguishes e.g. between exe and prg
<abu[7]>
var etc
<geri>
oh okay
<abu[7]>
@doc/ref.html#fun
<geri>
yeah found it
<geri>
prg is many exes and exe is just an eval'able expression
<abu[7]>
So an exe is a num, sym or cell
<abu[7]>
Yes
<abu[7]>
prg can be passed to 'run'
<geri>
is top level implemented using run
<abu[7]>
I think 'eval'
<abu[7]>
read eval print
<abu[7]>
(vi 'load)
<geri>
isnt exe kinda just a read eval (dont print) loop
<geri>
but a finite one
<abu[7]>
No
<abu[7]>
exe is data
<geri>
okee
<abu[7]>
a num, sym or cell
<abu[7]>
(vi 'load) then click on 'repl'
<abu[7]>
Hmm, I was wrong
<abu[7]>
exe is an "executable"
<abu[7]>
I mean s-expr
<abu[7]>
s-expr is read
<abu[7]>
And if it is code, it is an exe
<abu[7]>
And a prg is a list of exe's
<geri>
nice & weird :D
<abu[7]>
Simple :)
<geri>
can you show me an example of mapping a fexpr over a list?
<abu[7]>
'read' reads an s-expr
<geri>
cause ive kinda realized most of the time i cant even imagine how id do it
<abu[7]>
'eval' evaluates it if if we are in a repl
<geri>
yee
<abu[7]>
To fix the mess I told:
<abu[7]>
'repl' reads an expression, evaluates it, and prints the result if the current output channel is a stdout
<geri>
and loops!
<abu[7]>
Yess! :)
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<geri>
is there any way to force a fexp to evaluate its argument?
<geri>
like if we had `de' bu not `def' in pico
<geri>
...and we need to pass a value of a variable instead of a hardcoded variable
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<abu[7]>
Oops :)
<geri>
someone's real indecisive
<abu[7]>
"force" in which way?
<geri>
setq in common lisp also doesnt evaluate its first argument
<abu[7]>
It is
<geri>
but i can "force" it to by wrapping it in another macro
<abu[7]>
You can make a macro that uses 'setq', yes
<geri>
my bashrc, although its readability is to be questioned
<geri>
:D
<geri>
especially LS_COLORS
<geri>
and PS1
<abu[7]>
Don't you use .inputrc ?
<geri>
i use both
<geri>
although i wish i didnt have to
<abu[7]>
OK
<geri>
tab colors dont work properly unless you use inputrc
<geri>
actually the idea was to have bashrc work fine in standalone mode
<geri>
but i now use .profile and am pretty good with unconfigured bash too
<geri>
might as well migrate it all to inputrc
<abu[7]>
Pil also uses inputrc
<geri>
ye, i read about paren blink somewhere
<geri>
honestly its slightly confusing
<abu[7]>
This was one of the reasons why pil21 uses readline
<abu[7]>
Instead of the self-rolled one in pil32 and pil64
<geri>
so its configurable?
<geri>
or you mean for blinking parens
<abu[7]>
Just inputrc, out of the box
<geri>
oh wait, completions are so much better with proper inputrc
<abu[7]>
Also in PilBox
<geri>
xd
<abu[7]>
I copied my inputrc into PilBox
<abu[7]>
With readline completions A'm not satisfied
<abu[7]>
Seems we cannot configure delimites
<abu[7]>
*delimiters
<geri>
why do pair and atom not end with "?"
<abu[7]>
They are traditional Lisp functions
<abu[7]>
Most predicates in Pil don't end in ?
<geri>
why do some do but some dont :D
<abu[7]>
Historical
<abu[7]>
In some way every function is a predicate
<abu[7]>
or most
<geri>
is there anything you want to change about the language but cant because backwards compat will suffer?
<abu[7]>
Yes, some naming
<abu[7]>
T should be *T
<abu[7]>
and NIL -> *NIL
<abu[7]>
But I'm too much used to the current ones
<geri>
all capital were global, but if you add * to em they were like
<geri>
"very global"?
<geri>
xd
<abu[7]>
In fact T and NIL adhere to the conventions
<geri>
yeah, thats why im asking
<abu[7]>
"Global constants may be written all-uppercase"
<abu[7]>
T is a border line
<abu[7]>
*all* means just a single char ;)
<geri>
xd
<geri>
its totally a local variable
<abu[7]>
Yeah
<geri>
first letter is capital and none of others are!
<abu[7]>
T is easy to forget
<abu[7]>
(de f (R S T) ...
<abu[7]>
boom!
<abu[7]>
'lint' complains though
<abu[7]>
T locally bound as a param or local may terribly break a program
<abu[7]>
Cause T may evaluate to NIL
<abu[7]>
So I always recommend to call (lintAll) before going to production
<geri>
and then world goes on to take a nap
<abu[7]>
I do it from time to time in my apps
<abu[7]>
a nap?
<geri>
do companies other than yours use pil for production?
<abu[7]>
A few
<geri>
"when the world is gone to hell, go take a nap"
<abu[7]>
beneroth and aw- at least do
<geri>
neat, neat
<geri>
speaking of naps, i gotta sleep
<geri>
laters
<abu[7]>
Good! :)
<abu[7]>
C.U.
<geri>
👋
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<ellis>
i am back from my eternal slumber
<ellis>
re: setq in CL above, there is also set which will evaluate first arg, part of the spec i think
<ellis>
re transient-symbols: sounds like file-local scope may be an important consideration for em. if anyone stumbles on a real-world demo for it I would be interested in taking a look. I'm just looking for what type of design patterns it would be useful to apply to in situations where the security considerations aren't concerning, like the internals of the compiler
<abu[7]>
Yes, 'set' should be the same in CL & Pil