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Set by lizmat on 6 September 2022.
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defaultxr Hi. What would be the best way to define some kind of syntax sugar wrapping `sub` that will automatically add the name of the subroutine being defined to an array. I was thinking of doing that with a macro like macro my-sub($name) { quasi { sub {{{$name}}}($param) { ... } OUR::<@my-array>.push: {{{$name}}}; } } but I get "variable $text is not defined" when i try to call it like this: my-sub foo { 06:02
say "Hi"; } I know macros are experimental, so is there a more "Raku" way to do what i'm looking for?
In this case, $text should be an argument in the resulting function, which is why it's not an argument to the macro. 06:03
Oh I mistyped, $param in my macro should say $text 06:04
disbot3 <jubilatious1_98524> @defaulfxr I don't know about arrays, but you can do that with a Pair literal variant, see: discord.com/channels/5384078799804...1835083856 06:41
<jubilatious1_98524> m: my $var =42; say ~:$var 06:42
<Raku eval> var 42
<cerumod> oh, i forgot about this discord server.. but yeah, thanks, though i'm not sure i'm understanding how that can be used to do what i'm looking for. it looks like that is for getting a string of the variable name and its value? 06:51
<cerumod> basically what i want is a sugary way to do raku sub foo(...) { ... } @my-array.push: &foo; without having to manually remember to write the second line of that every time 06:54
<cerumod> instead i'd like to be able to just write raku my-sub foo { ... } 06:55
<cerumod> my attempt seems close, but i get a "variable $text is not declared" error when i try to use this: raku macro my-sub($name, &body) { quasi { sub {{{$name}}}($text) { &body; } OUR::<@my-array>.push: {{{$name}}}; } } 06:56
<cerumod> not sure if there's some way to escape the $text so that the macro isn't trying to expand it at macro expansion time 07:01
Voldenet I don't really get what you're trying to do, but you're getting into very deep hole with this 07:31
which may be not even necessary 07:32
m: my @all; sub trait_mod:<is>(&sub, :$known) { @all.push(&sub.name); &sub.wrap( -> |c { say "do you even need it wrapped tho?"; callsame }) }; sub huh is known { 2 }; say huh; say @all
camelia do you even need it wrapped tho?
2
[huh]
Voldenet it's not exactly the same syntax, but I'd argue it's more flexible, composable etc. 07:36
tiny problem is of the approach is that it's possible to create a sub with non-reachable name 07:46
m: my @all; sub trait_mod:<is>(&sub, :$known) { @all.push(&sub.name); &sub.wrap( -> |c { say "do you even need it wrapped tho?"; callsame }) }; sub p(&x){}; p(sub huh is known { 2 }); say @all 07:47
camelia [huh]
disbot3 <cerumod> yeah i'm not married to the idea of using macros or anything, they're just what i'm used to using for tasks like this when i'm writing in other languages. this trait_mod snippet looks like exactly what i need though, thank you! 07:59
Voldenet it should be `multi trait_mod` probably 08:02
m: my @all; multi trait_mod:<is>(Sub $sub, :$known) { say $sub.name.WHAT; @all.push($sub.name); $sub.wrap( -> |c { say "do you even need it wrapped tho?"; callsame }) }; sub huh is known { }; say @all 08:06
camelia (Str)
[huh]
disbot3 <jubilatious1_98524> m: raku -e 'sub foo($name) { put $name; }; say ~:foo("arnold");'
<Raku eval> Exit code: 1 ===SORRY!=== Error while compiling /home/glot/main.raku Two terms in a row at /home/glot/main.raku:1 ------> raku -e⏏ 'sub foo($name) { put $name; }; say ~:f expecting any of: infix infix stopper postfix statement end statement modifier statement modifier loop
<jubilatious1_98524> m: sub foo($name) { put $name; }; say ~:foo("arnold");' 08:08
<Raku eval> Exit code: 1 ===SORRY!=== Error while compiling /home/glot/main.raku Unable to parse expression in single quotes; couldn't find final "'" (corresponding starter was at line 1) at /home/glot/main.raku:1 ------> e) { put $name; }; say ~:foo("arnold");'⏏<EOL> expecting any of: single quotes term
<jubilatious1_98524> m: sub foo($name) { put $name; }; say ~:foo("arnold"); 08:09
<Raku eval> foo arnold
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disbot3 <librasteve> weekly: dev.to/fco/cromponent-new-features-3bhf 09:47
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SmokeMachine m: raku -e 'sub foo($name) { put $name; }; say ~:&foo("arnold");' 12:14
camelia ===SORRY!=== Error while compiling <tmp>
Two terms in a row
at <tmp>:1
------> raku -e<HERE> 'sub foo($name) { put $name; }; say ~:&
expecting any of:
infix
infix stopper
postfix
statement end
…
SmokeMachine m: sub foo($name) { put $name }; say ~:&foo 12:15
camelia Sub object coerced to string (please use .gist or .raku to do that)
foo foo
in block <unit> at <tmp> line 1
SmokeMachine cerumod: I don’t know what you want to do, but maybe storing the subs themselves would be better than storing their names? 12:18
m: my @all; multi trait_mod:<is>(Sub $sub, :$known) { @all.push($sub) }; sub huh is known { say 42 }; .() for @all 12:21
camelia 42
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arkiuat So the solution that y'all proposed yesterday using subsets and a parameterized role is coming along nicely; thanks for your help! 14:14
or was it day before yesterday?
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SmokeMachine :) 14:47
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tbrowder hi 15:53
is there any way to make a subroutine private other than not exporting it? 15:54
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tbrowder if not, in a package, can a lower-levej sub be made private to external users for higher-level subs? 15:58
i'm talking about normal use, not exotic access by determined users of Raku who can probably inspect everything. 16:00
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disbot3 <librasteve> hi tom … as docs.raku.org/type/Sub says subs are private already, nothing outside the block can see it … they are “my” scoped 17:08
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tbrowder librasteve: ah, that sound familiar, thank you very much! 17:51
tellable6 tbrowder, I'll pass your message to librasteve_
tbrowder back to the docs… 17:52
disbot3 <librasteve> you're welcome 17:55
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disbot3 <librasteve> weekly: rakujourney.wordpress.com/2025/07/...modelling/ 19:49
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arkiuat okay, I know there is a way to provide two different names for the same method, but I'm blanking on it. noai.duckduckgo.com mostly comes up with docs on multi subs or other irrelevancies no matter what search phrase I try, and I haven't turned it up in docs.raku.org after many searches 20:59
and yes, I've also been trying all sorts of things in the REPL, and seeing a lot of different error messages there 21:01
guifa uh I don't think for methods there is 21:06
I've added a quick trait in the past allowing for aliasing of method names
m: multi sub trait_mod:<is>(Method \m, Str :$also-called) { $*PACKAGE.^add_method($also-called,m) }; class A { method foo is also-called<bar> { say 42 } }; Foo.foo; Foo.bar; 21:09
camelia ===SORRY!=== Error while compiling <tmp>
Undeclared name:
Foo used at lines 1, 1
guifa err
m: multi sub trait_mod:<is>(Method \m, Str :$also-called) { $*PACKAGE.^add_method($also-called,m) }; class A { method foo is also-called<bar> { say 42 } }; A.foo; A.bar;
camelia 42
42
guifa arkiuat: ^^ you can obviously change the name of the trait as suits you 21:10
arkiuat guifa++ thanks 21:20
guifa I think the only reason I did that kind of aliasing was to allow for kebab and camel case simultaneously 21:22
arkiuat I just wanted to have a long name that was clear and a short name for typing in the REPL and whatnot 21:23
guifa ah yeah 21:24
totally good usecase
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arkiuat I just realized the "technique" I had originally been thinking of but was unable to bring to mind, a much simpler one: declaring a method that simply passes its args through to the method that I wanted to alias 22:22
weird how blanking on things works
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arkiuat the only special sauce is using |@_, |%_ as the args for the internal call 22:33
SmokeMachine arkiuat: maybe it would be better to use a Capture for that… 22:55
m: sub a(|c) { b |c }; sub b(|d) { say d }; a 42, :13bla 22:56
camelia \(42, :bla(13))
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