I've taken a first crack at creating a
Racket (programming language)
page in wikipedia, simply by copying the first few chunks of the PLT Scheme
page.
This is a bit experimental, because it may be that Wikipedia has an existing
mechanism for renaming, so I figured I'd just spend five minutes
On Jun 9, 2010, at 5:05 AM, Sam Tobin-Hochstadt wrote:
On Tue, Jun 8, 2010 at 11:27 PM, Eric Tanter etan...@dcc.uchile.cl wrote:
Yes, Carl got my point right. And yes, that's like showing square brackets
in the stepper ;)
Right now, the two cases are slightly asymmetric, since there's a
Is there some good reason why the 'document' and 'prolog' structures in the xml
library are not transparent? In the just trying to see what's there stage of
programming, it would be a lot simpler not to have to dig through them with
explicit accessors.
John
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On this page
http://pre.racket-lang.org/release/installers/
the reported size of the Windows installer is 29M, vs. about 47 or 48 M for
other platforms. I see that this was true of the 5.0 release as well, so this
is probably expected, but I'm curious: why is this? Is it just that the other
On Jul 30, 2010, at 6:47 AM, Robby Findler wrote:
On Fri, Jul 30, 2010 at 4:05 AM, Eli Barzilay e...@barzilay.org wrote:
IMO, this thing is missing the point (the usual parens, ewww! one),
as long as it ignores infix.
Seems to me that this point directly contradicts one of Shriram's
Reality check: I can't use the Racket ffi libraries to load 64-bit x86_64
shared libs, can I?
John
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I happened upon the Racket wikipedia page again, and yet again the Hello
World section made me want to cry. So I deleted it, and replaced it with the
straightforward version of racket's Hello, World! program, viz.:
#lang racket
Hello, World!
...then I added the sierpinski example from the
On Aug 17, 2010, at 3:57 PM, Jay McCarthy wrote:
We're attempting to write down coding guidelines for the project.
Here is a first attempt:
http://faculty.cs.byu.edu/~jay/tmp/201008161509-guidelines.html
and that you and your readers will so in the future
Will so? Should that have been
On Aug 17, 2010, at 4:27 PM, Jay McCarthy wrote:
On Tue, Aug 17, 2010 at 2:24 PM, John Clements
cleme...@brinckerhoff.org wrote:
On Aug 17, 2010, at 3:57 PM, Jay McCarthy wrote:
We're attempting to write down coding guidelines for the project.
Here is a first attempt:
http
On Aug 26, 2010, at 2:51 PM, Eli Barzilay wrote:
On Aug 17, Eli Barzilay wrote:
So now I have these counts:
http://tmp.barzilay.org/r1.png 4
http://tmp.barzilay.org/r3.png 1
http://tmp.barzilay.org/r4.png 2
Update on this: the first version (r1 above) was by far the most
On Aug 26, 2010, at 10:59 AM, Shriram Krishnamurthi wrote:
Got it. Thanks for all the inputs and for the great suggestion!
A couple of comments:
1) I could very well be mis-stating his position, but I think that Guillaume
felt quite strongly that the reductions should occur in the
On Aug 26, 2010, at 5:23 PM, Shriram Krishnamurthi wrote:
I know Guillaume proposed to do it in the context of the editor. I'm
unconvinced that that's the right way to go. At any rate, integrating
into an existing bit of infrastructure (def'ns or inter's) is going to
be much more complex
Is DrDr down? The latest build I see on drdr.racket-lang.org is from
2010-08-25.
Apologies if I missed an announcement.
John
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On Sep 1, 2010, at 1:55 PM, John Clements wrote:
I'm trying to run 'make install' on a Linux VPS, and it's halting -- at
different points -- with errors that look like this:
...
raco setup: made: framework
raco setup: made: browser/private
raco setup: made: framework/private
raco setup
Match is fantastic, and sometimes you want finer control over the error
messages. This morning I whipped up a match/fail* macro, which successively
matches against a sequence of patterns, and allows you to specify a separate
fail message for each layer.
It's a simple macro, and I give a use of
On Sep 7, 2010, at 6:56 AM, mlsm...@cs.vassar.edu wrote:
A new problem report is waiting at
http://bugs.racket-lang.org/query/?cmd=viewpr=11166
Reported by Marc Smith for release: 5.0.1
*** Description:
When stepping through a program in BSL, the stepper shows current progress,
e.g.,
I'm writing code for beginners that produces sound values. I'd like to
render these values as snips that have a start and a stop button.
My first experiment looked like this:
#lang racket
(require racket/gui)
(define f (make-object image-snip%
Seems like a FAQ, but:
I want to associate a single sound player with a drscheme process. When
student code runs, it needs to send messages to that sound player. I want to
make sure there's only one running at a time.
The first thing that pops into my head is some kind of shared-require
On Sep 10, 2010, at 8:17 PM, Eli Barzilay wrote:
On Sep 10, Robby Findler wrote:
FWIW, this is one path that tools can use to circumvent DrRacket's
property (well, the property we work towards anyways) that no program
can cause DrRacket itself to crash or freeze. So if you do provide
things
=[ 1 Commits ]==
Directory summary:
100.0% collects/test-engine/
~~
a095ebc John Clements cleme...@racket-lang.org 2010-09-17 10:18
:
| added format arg to printf to avoid corner-case printf bugs, rackety changes
:
M collects
On Sep 17, 2010, at 11:03 AM, Sam Tobin-Hochstadt wrote:
On Fri, Sep 17, 2010 at 1:36 PM, John Clements
cleme...@brinckerhoff.org wrote:
Oof... it looks like doing a rename plus a few changes pretty effectively
hides those changes, though I can dig them out with 'git annotate'. Do we
I'm trying to add together big buffers. The following code creates two big fat
buffers of 16-bit integers, and adds them together destructively. It looks to
me like this code *could* run really fast, but it doesn't; this takes about 8.5
seconds. Changing + to unsafe-fx+ has no detectable
On Sep 23, 2010, at 8:16 PM, Matthew Flatt wrote:
One more thought: Do you get to pick whether you use 16-bit integers or
64-bit floating-point numbers? The `flvector-' and `f64vector-'
operations are inlined by the JIT and recognized for unboxing, so using
flonum vectors and operations
On Sep 23, 2010, at 9:46 PM, John Clements wrote:
On Sep 23, 2010, at 8:16 PM, Matthew Flatt wrote:
One more thought: Do you get to pick whether you use 16-bit integers or
64-bit floating-point numbers? The `flvector-' and `f64vector-'
operations are inlined by the JIT and recognized
I accidentally opened a sound file in DrRacket today; cue six minutes of
thrashing and computer unhappiness. Would it be okay if I added a second-check
dialog to DrRacket that checked the size of a file before opening it, and asked
for confirmation before opening files larger than, say, 5MB?
The function u8vector-cpointer is documented, but doesn't exist; this is
presumably because the u8vector functions are actually byte-string functions,
but it's not clear to me whether the absence of u8vector-cpointer is an
oversight or whether it would violate abstractions in bad ways and hence
in order
to expect reasonable performance.
Sounds good to me: go for it!
John Clements
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I'm sure I'm just missing something obvious here, but is there a library that
provides things like unsafe-vector-length that are actually references to the
safe versions? I have a core dump occurring in (someone else's) unsafe code,
and I'd much rather just import a different library than go
On Sep 27, 2010, at 3:45 PM, Robby Findler wrote:
How about prefix-in with unsafe- as the prefix?
You still have to specify the right set of functions, right? But yes, that's
all I'm thinking of.
John
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On Sep 28, 2010, at 8:23 AM, Eli Barzilay wrote:
Can we please not have this?? The whole point of having uniform names
is that you can use require/provide things easily so there's no need
for a library.
Sure, I don't feel strongly about it. Done.
To be clear, my use case is this: I'm
On Sep 28, 2010, at 10:09 AM, Eli Barzilay wrote:
An hour ago, John Clements wrote:
On Sep 28, 2010, at 8:23 AM, Eli Barzilay wrote:
Can we please not have this?? The whole point of having uniform names
is that you can use require/provide things easily so there's no need
for a library
I want to read a chunk from the middle of a 50-megabyte file. As far as I can
see, there are no random-access file primitives currently in DrRacket. Also, I
don't see a skip-bytes, so it looks like I should be allocating a junk buffer
and then repeatedly calling read-bytes to read the skipped
I have a student who hasn't succeeded in running compiled-from-source DrRacket
on 64-bit ubuntu. Specifically, he claims it dumps core with
SIGSEGV MAPERR si_code 1 fault on addr 0x4
Aborted
on startup. I have *not* tried to verify this myself, so he's almost certainly
made a minor
A couple of weeks ago, you showed me the trick that rackunit uses to allow
single-instantiation of a modules. I'm now trying to do this
for a planet package, and it looks like I have to change the required module
from being a relative to being an absolute path. That is:
(require (prefix-in
On Oct 5, 2010, at 10:37 AM, Kevin Tew wrote:
I build on 64bit ubuntu every day.
a gdb backtrace would be helpful.
gdb handle SIGSEGV nostop noprint
gdb run
Kevin
I finally got a reply from the student. Here's what he said:
Ok, sorry this took so long, but I had to do the ritual
On Oct 7, 2010, at 4:45 PM, Matthew Flatt wrote:
At Thu, 7 Oct 2010 16:23:33 -0700, John Clements wrote:
Here's the student's backtrace. And yes, I now see that it *does* look like
the font issue that Matthew mentioned.
Actually, this looks more like an OpenGL issue. I don't have any
Back on October 11, you made a change to run-teaching-languages.rkt that works
absolutely fine with the stepper.
...but it breaks the stepper's testing harness. Ugh. The problem, IIUC, is
that the expansion of the teaching-language programs refer to a module,
test-engine/racket-tests, that
in the magnitude
(didn't check the phase).
1) Is this expected? I thought the non-radix2 one was still fairly clever about
subdividing when the number of points is divisible by 2.
2) If so, would it make sense to test for powers of 2?
John Clements
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On Oct 19, 2010, at 5:17 AM, Doug Williams wrote:
On my laptop:
#lang racket
(require fft.rkt)
(define v (build-vector 16384 (lambda (i) (random
(define v1 (vector-copy v))
(collect-garbage)
(collect-garbage)
(collect-garbage)
(time (fft-complex-radix2-forward v1))
On Oct 19, 2010, at 10:02 AM, John Clements wrote:
2) The interactive tests fail like this:
given: #(struct:error-result namespace-variable-value: test~object is not
defined)
I haven't worked on this one yet... but it looks like this is also something
that was added this month
Okay, this just sounds stupid: my 'git fetch' is failing on the PLT tree. I
can ssh to the pltgit machine just fine:
john-clementss-macbook-pro:~/git-clements clements$ ssh git
PTY allocation request failed on channel 0
hello clements, the gitolite version here is v1.4-14-g36317c4
the gitolite
Okay, here's what seems to be broken:
1) cond, as Mike observed. This is related to the different expansion of cond.
2) make-foo, where foo is a user-defined structure. There's a mysterious extra
false that's showing up.
3) reduction of (cons 1 (cons 2 empty)) in beginner only.
4) local
On Oct 20, 2010, at 7:39 AM, Doug Williams wrote:
I downloaded the pre-release version this morning - 10/20 (I believe it was a
build from 10/16). The plot package and plot extensions in the science
collection all work as expected. But, I am getting different numeric answers
for some of
On Oct 21, 2010, at 4:07 PM, Ryan Culpepper wrote:
Checklist items for the v5.0.2 release
(using the v5.0.1.900 release candidate build)
* John Clements cleme...@brinckerhoff.org
- Stepper Tests
Updates:
- Stepper Updates: update HISTORY
(updates should show v5.0.2 as the most
Let me preface this by saying that I'm sure this is somehow my fault.
Nevertheless, it seems broken. Trying to *remove* a planet package triggers
its re-download and installation. See the transcript below.
I'm guessing this has something to do with my use of development links, though
I don't
On Oct 26, 2010, at 12:28 PM, Matthias Felleisen wrote:
1. BSL, BSL+, ISL, and ISL+ (HtDP teaching languages) no longer support
checked signatures.
2. The stepper should kind of mostly work for universe programs. John?
Precisely.
That is: there's more junk that could be hidden, but
On Oct 27, 2010, at 9:54 AM, Matthew Flatt wrote:
I think Robby recently changed DrRacket so that user programs don't
share `ffi/unsafe' with DrRacket. That would lead to multiple
`s16vector' structure types (which didn't occur to me when Robby asked
if it would be ok to not share), and that
I don't know whether this is better or worse, but it's different; in gracket2,
the intro lines of text in the interactions pane are closer together. I
measured the distance between the first and second line baselines to be two
pixels larger (18 vs. 16) in the old version, gracket. This is
I took a look at the size of our C code base (all files ending in .c, .h, .cpp,
and .cxx, not including those with 'xsrc' in the path) to see how much smaller
gracket2 is, and (assuming I didn't miss something major) the difference is
truly impressive. The below is ... | wc | sort -n | tail,
I've put together a fix for the inability to share FFI objects between user
namespaces... but it has a catch.
Specifically, I moved the define-struct of cpointer into a module by itself,
called ffi/unsafe/cvector-def; that way, my tool.rkt file can require this
one-line module and attach it to
This reminds me of those medication ads that have wavy text to prevent
detection. Look at the text line at the start of a program to see what I mean.
Eli, sorry for the 50K attachment.
John
inline: wavy-letters.png
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I had a not-easily-reproducible problem today where the tab-change keybinding
(shift-cmd-right) was not working as expected. In particular, hitting with two
tabs open and the first one shown would switch briefly to the second, then pop
back to the first.
As I've said, I don't know how to
Your science collection stores images as bitmaps. Storing them as png's
instead reduces their size by about 99%. This is lossless, so there's no
reduction in quality.
If I'm doing the math correctly, this could reduce the size of the installed
science collection from about 78 megabytes to
Dear Heavens, this is the most unpleasant message box I've seen in a while,
when trying to save a file with the extension scrbl in OS X 10.6.4:
boldYou cannot save this document with extension .scrbl at the end of the
name. The required extension is ../bold
You can choose to use both, so that
I like the new gc cursor. I see something interesting though, when DrRacket
starts spinning hard, which is that the recycle cursor gets left wherever it
was, and the traditional pizza returns. This is more in the realm of curiosity
than bug, though.
John
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I've just been cleaning up plot's fit functionality, and I'm starting to
wonder... did it *ever* work?
John
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Here's an ffi object I'd like to construct:
(define do-fit-int
(get-ffi-obj do_fit libfit
(_fun (func : (_fun _int _pointer - _double))
(val-num : _int = (length x-values))
(x-values : (_list i _double*))
(y-values : (_list i _double*))
frustration, and would not prevent students from
writing the programs that they wanted to.
No?
John Clements
#lang racket
(require rackunit)
(define-syntax (define/noloop stx)
(syntax-case stx ()
[(_ (funname arg ...) body ...)
#`(define funname
(let ()
(define
The documentation for '_enum says this:
3.8 Enumerations and Masks
Although the constructors below are describes as procedures, they are
implemented as syntax, so that error messages can report a type name where the
syntactic context implies one.
(_enum symbols [basetype]) → ctype?
symbols
On Nov 15, 2010, at 3:02 PM, John Clements wrote:
The documentation for '_enum says this:
3.8 Enumerations and Masks
Although the constructors below are describes as procedures, they are
implemented as syntax, so that error messages can report a type name where
the syntactic
On Nov 16, 2010, at 2:13 PM, Robby Findler wrote:
That expression at the end is somehow turning a procedure back into
its quoted form. I have no idea if a Scheme that did that would be R5
or not, but Racket definitely does not allow that (and neither did any
other programming language that
Well, he's generous about it; here's what he had to say.
John
Begin forwarded message:
From: Aaron Stump aaron-st...@uiowa.edu
Date: November 16, 2010 5:58:42 PM PST
To: John Clements cleme...@brinckerhoff.org
Subject: Re: Q. about Directly Reflective paper
Reply-To: ast...@cs.uiowa.edu
On Nov 14, 2010, at 1:35 PM, Dmitry Chestnykh wrote:
On Sun, 14 Nov 2010, Robby Findler wrote:
Currently, DrRacket uses cmd-[ and cmd-] and it seems unfortunate to
have to change that by adding another modifier. I see that terminal
uses that for cycling windows, and safari and firefox use
It appears to me that TR does not preserve source locations, which makes
testing extremely painful (which test failed? Who knows.) I'm hoping that I'm
just missing something obvious, here. I'm also in the market for obvious
workarounds. Apologies if this is a FAQ; I did actually google for the
... p.s.: anyone who uses the terrible pun Racking Your Brain in a paper
title must now treat me to a rack of lamb.
Unless that paper's already written.
John
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(followups trimmed to dev; is that an acceptable strategy?)
On Nov 24, 2010, at 12:44 PM, Robby Findler wrote:
On Wed, Nov 24, 2010 at 1:49 PM, John Clements
cleme...@brinckerhoff.org wrote:
On Wed, Nov 24, 2010 at 11:05 AM, Robby Findler
ro...@eecs.northwestern.edu wrote:
On Wed, Nov 24
While you're in meta-programmer mode, any interest in automatically computing
planet dependencies? I'd *love* to know what packages a planet package depends
on. I understand that in the presence of dynamic-require, you can only do so
well, but even a first approximation could be incredibly
, and
has collected about 3900 errors. It's not yet ready for download, but I'd be
interested in hearing whether something like this could be useful for you.
John Clements
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Begin forwarded message:
Shriram wrote:
And the syntax of local IS a problem.
(dev-only)
+1
John
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I just heard about OpenMath SCSCP, open standards (XML-based) for
representing algebraic entities and allowing remote procedure calls to a
variety of existing commercial and free algebraic solvers, and my first thought
was: yikes! Do we have bindings for this? It looks like we don't. Given the
On Dec 7, 2010, at 5:52 PM, Eli Barzilay wrote:
6 minutes ago, Robby Findler wrote:
It is a kind out of the way place but it would be a shame if someone
went there, esp. since the latest stuff is in the middle of the
list.
OK, so I'll take it as a yes vote. Any suggestion for new names?
I'm seeing this result from DrDr on one of my files:
(gracket:19767): Gdk-WARNING **: shmget failed: error 28 (No space left on
device)
... and I'm assuming that it's a drdr issue related to running files that
involve graphical display, and that I don't need to worry about it. Is this
Eli: You use a variant of TR for your PL class, right? Is your stuff fairly
straightforward, or would it be a mistake for me to try to adopt it? I just
tried installing your .plt package, and got a few install errors (below, if you
care), so it's hard for me to evaluate this myself. I took a
Debian is a slow-moving distribution, and it looks to me like the version of
libgtk in the stable version of Debian Lenny isn't new enough for DrRacket.
Here's what I get on startup:
ffi-obj: couldn't get gtk_combo_box_set_button_sensitivity from
libgtk-x11-2.0.so.0
: is there a simple mechanism that replaces this optional argument?
John Clements
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/mred/private/
~~
47e3db0 John Clements cleme...@racket-lang.org 2011-01-02 14:45
:
| change pref name to match docs
Hope this isn't too forward of me; I figured that since the docs had already
changed, it wouldn't be too presumptuous to change the implementation.
Apologies
While running drracket on Fedora Core 9, I got a bunch of stderr messages from
Gdk:
cleme...@vogon:~/.racket/5.0.99.6 $ Gdk: gdk_window_thaw_updates: assertion
`private-update_freeze_count 0' faile
Gdk: gdk_window_thaw_updates: assertion `private-update_freeze_count 0' faile
Gdk:
On Jan 7, 2011, at 7:42 AM, Robby Findler wrote:
Another question: what if I commit something just for the purpose of
moving to another machine and I don't want that commit to show up in
the main repository? Is that possible? (My tree is currently in that
state; it is one commit ahead of
Currently, you can't run the mongodb tests in DrRacket, because they use
subprocess with (current-output-port), which (in DrRacket) is not a
file-stream port.
In DrRacket's interactions window:
(file-stream-port? (current-output-port))
#f
Is this expected, or should DrRacket's
, something along the lines of There are no further
steps to take and There are no previous steps to take would be better, IMO.
Okay, I've made these messages more specific, by parameterizing over the
fail-message associated with each operation. Let me know if you have other
suggestions.
John
This article from TidBITS
http://db.tidbits.com/article/11864
describes the launch of the new Mac App Store. It's clearly Apple's intention
to make this the primary way of distributing software on the Mac, and it
wouldn't surprise me to see not-so-subtle barriers to non-app-store app
It probably won't come as a surprise to hear that the newer gr2 flavor of
DrRacket resolves all of the bizarre (and unfixed) font problems I had with
older versions of DrRacket on bare-bones debian systems.
Thanks!
John
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I have a student who's trying to compile DrRacket for Windows using cygwin, and
I have two questions:
1) Is using cygwin to build from source expected to work?
2) It looks like the cygwin build expects UNIX-style line endings, is that
correct?
Many thanks,
John
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I went looking for the immutable hash table functions in plai today, and I
discovered that since plai is based on #lang scheme rather than #lang racket,
you need to use old names in a bunch of places.
Just for the heck of it, I went ahead and changed scheme - racket in two
places in
On Jan 19, 2011, at 1:13 PM, Jay McCarthy wrote:
2011/1/19 John Clements cleme...@brinckerhoff.org:
I went looking for the immutable hash table functions in plai today, and I
discovered that since plai is based on #lang scheme rather than #lang
racket, you need to use old names in a bunch
On Jan 18, 2011, at 8:07 AM, Eli Barzilay wrote:
Two minutes ago, Noel Welsh wrote:
For posterity, this works:
On Mon, Jan 17, 2011 at 3:12 PM, Robby Findler
ro...@eecs.northwestern.edu wrote:
You can also set PLT_SETUP_OPTIONS to -D and then make install will
avoid building the docs.
On Jan 27, 2011, at 8:49 AM, Casey Klein wrote:
DrRacket indents this program
(a
)
differently than this program
{a
}
Is this intentional? I can imagine the behavior being useful for
Scribble, but it's annoying in a PLAI context where you're using curly
braces for object
, and I'll supply the
.plt file, if you like. Would you consider making this change?
Many thanks,
John Clements
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It looks like the infotab/setup field named tool-names has been renamed
drracket-tool-names. Is this correct? Should I make this change in all my
PLaneT packages?
John
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On Feb 8, 2011, at 12:15 AM, Matthew Blakley wrote:
I've been trying to duplicate the macintel builds from the meta/build system
on mac 10.6 system with 64-bit kernel (uname -m = x86_64).
So in a git plt tree...
../src/configure --enable-sdk=/Developer/SDKs/MacOSX10.4u.sdk
make
I'm scrumbling through the web server source, and it looks to me like there's a
response/xexpr but no response/sxml ... yet. Right? I'm guessing I could do a
half-assed job of building it, but I want to make sure it doesn't already exist.
John
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Updating tools from drscheme-drrracket involves two steps:
1) changing the tool to refer to drracket, and
2) changing the info.rkt file to refer to drracket-tools rather than tools.
Unfortunately, if you do #2 before #1, you get a real head-scratcher of an
error message:
define-unit-binding:
Dimitry (cc:ed) seems to be unresponsive. Currently, the sxml package has a
tiny little problem in its info.rkt file which results in a grotesquely
inflated compile time; ryan reported this quite some time ago. Based on the
license notices in some of the source files, it appears that this
Currently, raco planet does not signal an error on the removal of a nonexistent
link:
pcp070580pcs:~/sxml clements$ raco planet unlink frooty bogus.plt 3 4
pcp070580pcs:~/sxml clements$
Anyone mind if I change the code to signal an error in this case?
John Clements
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On Feb 15, 2011, at 12:55 PM, Carl Eastlund wrote:
I have a make unlink target in my Planet-development Makefile that
removes all the development links I commonly use. I use it to start
fresh, when some or all of the links are installed. I would rather
keep the ability to use it regardless
Running a particular file has been crushingly slow for me, and I finally traced
it down (apparently) to the addition of an except-in wrapper around a planet
require. Adding the wrapper changes a consistently sub-1-second compile-and
run into a big thrashing memory-fest. Is there some kind of
as a separate #%require. So it
seems plausible that except-in, rename-in, etc. might seriously impact
compile time.
Also, FWIW: this is a hard-link planet package, not a normally installed one.
John
Carl Eastlund
On Thu, Feb 17, 2011 at 5:04 PM, John Clements
cleme...@brinckerhoff.org
, especially since I have every reason to believe that sxml
provides a *lot* more names.
Thanks!
John
Carl Eastlund
On Thu, Feb 17, 2011 at 5:18 PM, John Clements
cleme...@brinckerhoff.org wrote:
On Feb 17, 2011, at 2:12 PM, Carl Eastlund wrote:
I don't know precisely what is going
On Feb 27, 2011, at 11:42 AM, Robby Findler wrote:
Yes, that's it. Also, put something into the after-save-file-method:
diff --git a/collects/framework/private/editor.rkt
b/collects/framework/private/editor.rkt
index 0c8981b..cb5504a 100644
--- a/collects/framework/private/editor.rkt
+++
I'm doing a web-server/insta example in class, and one of my students (Arlo
White, cc:'ed) pointed out that the existing framework for extracting bindings
seems to be missing a bunch of useful functions. In particular, he volunteered
to implement a few of the functions from the Spring
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