<erkin>
I'm inserting a bunch of lines between begin-edit-operation and end-edit-operation on a separate thread, but this is painting the canvas white for that interval, instead of what I specified with set-canvas-background.
<erkin>
Inserting to the canvas's editor (a text%), that is.
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<lavaflow>
the documentation for racket-mode is really nice
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<ermo>
Hi. I'm creating a build recipe (exheres) for racket on Exherbo Linux. I'm wondering under which circumstances it makes sense to enable the --enable-jitframe option?
<ermo>
tips and pointers welcome =)
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<escew>
hello, i made a parser using the brag library and it's really slow. is that normal? here's the code for the parser http://pasterack.org/pastes/87363
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<greghendershott>
escew: I don't know if it's normal but in my limited experience sometimes the grammar is the biggest factor in performance.
<greghendershott>
You know how a different algorithm can be the biggest improvement; well the grammar is effectively your parsing algorithm.
<greghendershott>
Sometimes a small tweak can improve it. Minimize re-parsing prefixes, minimize needing to back-track, etc.
<greghendershott>
I'm afraid that's all I can suggest; hopefully others will have better ideas. Meanwhile you could try tweaking the grammar.
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<samth>
ermo: in general, you don't need it. it's primarily useful if you're using gdb
<ermo>
samth: so if I'm debugging a compiled racket program with gdb you mean?
<samth>
or, more likely, if you want to use profiling tools like perf that need the frame pointer
<samth>
but I can't remember ever having used it
<ermo>
Exherbo supports the concept of options. I'd like to be able to set a 'debug' option to get a build with maximum inspectability of racket programs enabled. Which configure variables would you suggest enable for that specific (non-general) case?
<samth>
so almost certainly you won't want to do that
<ermo>
(exherbo is a from-source distribution)
<ermo>
samth: ... and thanks for engaging with me ^^'
<ermo>
I'm new(-ish) to racket, so I'm just trying to find my feet
<samth>
none of the configure options are likely to be useful for someone debugging their own racket programs
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<ermo>
oh, so the debugging-related configure options are mostly useful to racket-the-language developers who might need to inspect its internals for correctness and to suss out the root cause of bugs/performance deficiencies?
<samth>
yes
<ermo>
thanks -- that clears things up for me :)
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<escew>
greghendershott: thanks. i already tried minimizing it to the point where it's not even useful anymore but it was still very slow so i'm kind of lost at this point.
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<ermo>
samth: Do you happen to know what the '--enable-docs/--disable-docs' configure switch is supposed to turn off? When I compare a build of racket-7.3 with either option, it comes out exactly the same in terms of the files that are installed to the system?
<ermo>
despite the fact that the ./configure script clearly outputs different things with the option enabled/disabled?
<ermo>
is it supposed to change the generated Makefile install target or somesuch?
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<samth>
it passes --no-docs to the `raco setup` command
<ermo>
could it be because I'm packaging the tarball containing pre-compiled racket bytecode?
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<samth>
i doubt it
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<spacedbat>
according to the racket help, -I <path> : Set <init-lib> to <path> (sets language)
<spacedbat>
racket -I typed/racket works fine
<spacedbat>
but racket -I web-server/insta doesn't
<spacedbat>
open-input-file: cannot open module file
<samth>
spacedbat: web-server/insta doesn't work at the REPL
<spacedbat>
is there any way to know which langs work in the repl?
<samth>
ermo: mostly I'm suggestion something more like the debian text -- lead with what Racket is, not the history
<ermo>
bremner: and thanks for the pointer
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<samth>
I'd drop the (formerly PLT Scheme) thing from the debian text as well -- 2010 was a long time ago
* ermo
adopts the debian text
<bremner>
samth: yeah, I should do a "forget plt-scheme" cleanup, there are virtual packages and so on that could also go
<ermo>
my current summary is "Racket is a LISP/Scheme-family full spectrum programming language."
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<samth>
I would say "Racket is a general purpose programming language with a focus on extensibility and constructing domain-specific languages" or something like that
<ermo>
samth: Why would you prefer not to mention the LISP/Scheme roots?
<samth>
ermo: I don't think it helps people much in understanding Racket
<samth>
of course, other people may disagree
<ermo>
I'm genuinely curious about why you feel that way ^^'
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<ermo>
bremner: may I pm?
<danderson>
depends what you're using the description for.
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<danderson>
mentioning that it's a lisp will cause ~3 reactions: (1) "yay, a lisp!" (2) "what's a lisp?" (3) "ugh lisp"
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<ermo>
danderson: the same can be said for a C-like language though.
<danderson>
so, it depends on the audience.
<bremner>
ermo: ok
<danderson>
if you're trying to sell Racket to a room of folks who've done nothing but Java for 10 years, "it looks and feels very different" is a problem and you probably want to focus on the benefits before getting into the switching costs
<ermo>
danderson: My audience is tinkerers with a strong diy and comp.sci. background
<danderson>
if it's for a room of freshmen doing CS101, "it's a lisp" won't mean anything without a history lesson, etc. :)
<danderson>
then mentioning lisp isn't a big deal, imo. It helps people load in the right context.
<ermo>
or, that's one audience. The other audience is a "What's this Solus thing I keep hearing about?" type of audience
<ermo>
danderson: that's what I was thinking
<danderson>
that said, I think samth's overall phrasing is better, specifically because it focuses on what Racket is *for*, not where it comes from
<danderson>
maybe a bit of merging of the two, if you want to keep the lisp mention
<danderson>
... what is this solus thing? I find a linux distro and a playstation VR game
<ermo>
the former
<ermo>
samth: switching to the sources with no precompiled bytecode packages and using --disable-docs resulted in a substantial reduction in installed files and much fewer .html files.
<samth>
ermo: note that that will result in programs running much more slowly
<ermo>
samth: so clearly it would appear that `raco setup` ignores the --no-docs argument for the sources that contain pre-compiled bytecode.
<samth>
because of the lack of compiled byte code
<ermo>
samth: can I add an extra compile step in the compile phase of my package?
<ermo>
tradition in exherbo dictates that documentation not be installed by default
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<ermo>
(don't ask)
<samth>
I think the --no-docs flag may not be working correctly
<ermo>
^^'
<ermo>
samth: can I instruct raco to pre-compile bytecode during the compile step somehow?
<samth>
raco setup does that
<samth>
but I'm not sure exactly what you mean about precompiled bytecode
<ermo>
AIUI, racket is distributed in unix source format with and without "built packages". The version with "built packages" is the one where I have found that --disable-docs doesn't work
<ermo>
I assume that "built packages" means "pre-compiled bytecode" for said packages? Am I mistaken?
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<ermo>
samth: ^
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<samth>
I think that version comes with the docs already built
<samth>
which is why it doesn't disable them
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<ermo>
samth: the sources without precompiled packages calls 'raco setup' which precompiles all .rkt into compiled/.zo files locally -- it makes the build take a little longer, but it's not a problem for the target audience.
* ermo
is curious to see where typed racket will end up
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