[racket-users] define-syntax question

>From Greg Hendershott's Fear of Macros, section 3.3: > (define-syntax (show-me stx) (print stx) #'(void)) > (show-me '(+ 1 2)) # Why does the syntax object stx include "show-me"? Intuitively I would expect just the syntax object representing '(+ 1 2) -- You received this message

Re: [racket-users] define-syntax question

On Monday, March 13, 2017 at 1:35:12 PM UTC+1, Matthias Felleisen wrote: > > On Mar 13, 2017, at 7:06 AM, NeverTooOldToCode wrote: > > > > From Greg Hendershott's Fear of Macros, section 3.3: > > > >> (define-syntax (show-me stx) > >(print stx) > >#'(void)) > >> (show-me '(+ 1 2)) > > >

Re: [racket-users] define-syntax question

> On Mar 13, 2017, at 7:06 AM, NeverTooOldToCode wrote: > > From Greg Hendershott's Fear of Macros, section 3.3: > >> (define-syntax (show-me stx) >(print stx) >#'(void)) >> (show-me '(+ 1 2)) > > # > > Why does the syntax object stx include "show-me"?

[racket-users] linking with raco ctool : unable to find libracket3mxxxxxxx.lib

Hi, I'm compiling portaudio's callbacks.dll to have it with debug symbols but I'm running into a configuration issue. when running raco ctool --ld ... I get the message that libracket3mxxx.lib is not found. I tried running racket -l setup/winvers but did not see any change. what would be

[racket-users] Virtual connections, threads, and DSN extraction, oh my!

I've got a centralized database connector: (define dbh (virtual-connection (connection-pool (thunk (postgresl-connect ...) This gets passed around from handle to handle and into various temporary or ongoing worker threads. Thinking about it, I'd

[racket-users] refactoring help/tools?

Hi - In refactoring a some Racket code I'd love to have a "require and provide only what you need" tool to help trim down the require and provide lists. Is there such a thing? Or at least a better approach for this than inspection or trial and error? Thanks, Dna -- You received this message

Re: [racket-users] refactoring help/tools?

racket-mode in Emacs does this Jay On Mon, Mar 13, 2017 at 1:17 PM Dan Liebgold wrote: > Hi - > > In refactoring a some Racket code I'd love to have a "require and provide > only what you need" tool to help trim down the require and provide lists. > Is there such a

Re: [racket-users] Virtual connections, threads, and DSN extraction, oh my!

On 3/13/2017 5:16 PM, Ryan Culpepper wrote: When a thread uses a VC, it gets an underlying connection assigned exclusively to it for the lifetime of the thread[*]. When the thread dies, the VC releases the underlying connection; if it came from a pool, it returns to the pool and it can be

[racket-users] prepared queries

Hi Ryan, On 3/13/2017 5:43 PM, Ryan Culpepper wrote: Racket's db library always prepares a statement before executing it, even if there are no query parameters. When allowed, instead of closing the prepared statement immediately after executing it, the connection stores it in a

Re: [racket-users] refactoring help/tools?

> On Mar 13, 2017, at 5:26 PM, Stephen De Gabrielle > wrote: > > Do you mean a drracket plugin that > i. Expands #lang racket into racket/base and requires, > ii. removes the unneeded requires I am sure that one day soon someone will write a dissertation that (1)

Re: [racket-users] refactoring help/tools?

raco check-requires might do some of what you want. -Philip On Mon, Mar 13, 2017 at 12:18 PM, Jay McCarthy wrote: > racket-mode in Emacs does this > > Jay > > On Mon, Mar 13, 2017 at 1:17 PM Dan Liebgold > wrote: > >> Hi - >> >> In

Re: [racket-users] refactoring help/tools?

M-x racket-tidy-requires Jay On Mon, Mar 13, 2017 at 1:29 PM Matthias Felleisen wrote: > > Does Emacs really give you this refactoring? If so, I may have to > reconsider DrRacket. > > > > On Mar 13, 2017, at 1:18 PM, Jay McCarthy > wrote: > > > >

Re: [racket-users] refactoring help/tools?

I know that one. I want the refactoring. > On Mar 13, 2017, at 1:40 PM, Robby Findler > wrote: > > Not the same thing, but if you mouse over the requires in DrRacket, it > will put a red background on the ones that have no apparent use (of > course, requires may

Re: [racket-users] refactoring help/tools?

Not the same thing, but if you mouse over the requires in DrRacket, it will put a red background on the ones that have no apparent use (of course, requires may have an effect too; neither tool picks that up, IIUC). Robby On Mon, Mar 13, 2017 at 12:38 PM, Jay McCarthy

Re: [racket-users] refactoring help/tools?

Does Emacs really give you this refactoring? If so, I may have to reconsider DrRacket. > On Mar 13, 2017, at 1:18 PM, Jay McCarthy wrote: > > racket-mode in Emacs does this > > Jay > > On Mon, Mar 13, 2017 at 1:17 PM Dan Liebgold >

Re: [racket-users] refactoring help/tools?

On Monday, March 13, 2017 at 10:40:15 AM UTC-7, Robby Findler wrote: > Not the same thing, but if you mouse over the requires in DrRacket, it > will put a red background on the ones that have no apparent use (of > course, requires may have an effect too; neither tool picks that up, > IIUC). >

Re: [racket-users] refactoring help/tools?

The bubble in the bottom right corner turns green when it is done (or red, if it found an error). Robby On Mon, Mar 13, 2017 at 12:52 PM, Dan Liebgold wrote: > On Monday, March 13, 2017 at 10:40:15 AM UTC-7, Robby Findler wrote: >> Not the same thing, but if you

Re: [racket-users] refactoring help/tools?

Actually it is the trim option. I prefer racket-base-requires though Jay On Mon, Mar 13, 2017 at 1:37 PM Jay McCarthy wrote: > M-x racket-tidy-requires > > Jay > > On Mon, Mar 13, 2017 at 1:29 PM Matthias Felleisen > wrote: > > > Does Emacs really

Re: [racket-users] refactoring help/tools?

raco check-requires does the job. I use emacs racket-mode, but it's hobbled in ways I haven't investigated -- e.g. when I try to use tidy or trim requires it gives me a "Can't do, source file has error" when it doesn't, or at least not in a way I can see. -- You received this message because

Re: [racket-users] Virtual connections, threads, and DSN extraction, oh my!

On 03/13/2017 12:49 PM, David Storrs wrote: [...] Assuming I've understood all that correctly, my last question would be how to get around the 'can't do prepare with a virtual connection' issue for situations where I've been passed a connection (perhaps from third party code) and it might or

Re: [racket-users] Virtual connections, threads, and DSN extraction, oh my!

Hi David, On 3/13/2017 12:49 PM, David Storrs wrote: I've got a centralized database connector: (define dbh (virtual-connection (connection-pool (thunk (postgresl-connect ...) This gets passed around from handle to handle and into various temporary or

Re: [racket-users] refactoring help/tools?

The `racket-trim-requires` and `racket-base-requires` commands use `raco check-requires` behind the scenes (then format/sort as does `racket-tidy-requires`). Today I tried to use `racket-trim-requires` on a Typed Racket file containing `define-type`; and got the error you mention. This turned out

[racket-users] Re: prepared queries

On 03/13/2017 06:30 PM, George Neuner wrote: Hi Ryan, On 3/13/2017 5:43 PM, Ryan Culpepper wrote: Racket's db library always prepares a statement before executing it, even if there are no query parameters. When allowed, instead of closing the prepared statement immediately after executing it,

[racket-users] Why does 1 count as numeric in xexpr, but 0 does not?

Hi, I am creating matrices of 0s and 1s that I display in HTML-tables and somewhat surprisingly I found out that 0s are not permissible in X-expressions, while 1s are: (require web-server/http) (response/xexpr '(html 1)) ; Fine, no trouble. (response/xexpr '(html 0)) ; Blow-up. The specific

Re: [racket-users] Why does 1 count as numeric in xexpr, but 0 does not?

Numbers in x-expressions are interpreted as XML entities, not as the string representation of the number. The value of (xexpr->string '(html 1)), to use your example, is "". The 1 represents the character that Racket would represent as #\u0001, i.e. the value of (integer->char 1). In contrast,

[racket-users] Require the same file repeatedly for debugging on command line

Hi all, while trying to debug, I often change the code in the text file and then want to do a (require "file-with-code.rkt") on the command line to test the new code. This never works, because I cannot redefine imported modules. Thus I always use Dr Racket for this, where I can hit the "Run"

Re: [racket-users] refactoring help/tools?

I've started working on adding this refactoring to DrRacket[1], it's not quite as full-featured(and is definitely still a bit buggy) as what racket-mode in emacs seems to allow, but it's a first step and I'd appreciate suggestions or requests on how DrRacket can better support developers editing

[racket-users] SUBJECT: ACM/SPEC ICPE'17 - Call for Participation

ICPE 2017 8th ACM/SPEC International Conference on Performance Engineering    Sponsored by ACM SIGMETRICS, SIGSOFT, and SPEC RG L'Aquila, Italy   April 22-27,

Re: [racket-users] Virtual connections, threads, and DSN extraction, oh my!

On Mon, Mar 13, 2017 at 2:49 PM, George Neuner wrote: > > This is why you can't use prepared queries with virtual connections - > because there is no guarantee that the connection that prepared the query > will be the same one that tries to execute it. > *nod* Good,

Re: [racket-users] Virtual connections, threads, and DSN extraction, oh my!

On Mon, Mar 13, 2017 at 2:04 PM, Ryan Culpepper wrote: > On 03/13/2017 12:49 PM, David Storrs wrote: > >> [...] >> >> >> Assuming I've understood all that correctly, my last question would be >> how to get around the 'can't do prepare with a virtual connection' issue >> for

Re: [racket-users] Virtual connections, threads, and DSN extraction, oh my!

On 3/13/2017 3:41 PM, David Storrs wrote: On Mon, Mar 13, 2017 at 2:04 PM, Ryan Culpepper > wrote: If you are using `prepare` just for speed, it might help to know that most base connections have an internal statement cache that maps SQL strings to

Re: [racket-users] Virtual connections, threads, and DSN extraction, oh my!

On 03/13/2017 03:16 PM, David Storrs wrote: [...] On Mon, Mar 13, 2017 at 2:49 PM, George Neuner > wrote: - It's also fine to pass the VC into other threads. It will be shared state between the threads, but the CP will keep their

Re: [racket-users] Virtual connections, threads, and DSN extraction, oh my!

Thank you, everyone. I really appreciate the detailed answers. On Mon, Mar 13, 2017 at 5:16 PM, Ryan Culpepper wrote: > On 03/13/2017 03:16 PM, David Storrs wrote: > >> [...] >> On Mon, Mar 13, 2017 at 2:49 PM, George Neuner >

Re: [racket-users] refactoring help/tools?

Sorry - I meant to reply all. My questions weren't directed at anyone specific. S. On Mon, 13 Mar 2017 at 21:24, Stephen De Gabrielle wrote: > Do you mean a drracket plugin that > i. Expands #lang racket into racket/base and requires, > ii. removes the unneeded

Re: [racket-users] Virtual connections, threads, and DSN extraction, oh my!

On 03/13/2017 04:56 PM, George Neuner wrote: On 3/13/2017 3:41 PM, David Storrs wrote: On Mon, Mar 13, 2017 at 2:04 PM, Ryan Culpepper > wrote: If you are using `prepare` just for speed, it might help to know that most base connections have an

Re: [racket-users] Virtual connections, threads, and DSN extraction, oh my!

On 3/13/2017 3:16 PM, David Storrs wrote: ... you talk about the "real connection", singular -- aren't there multiple real connections underlying the pool? Yes, a pool maintains some number of real connections to the DBMS. Note, however, that a pool can be configured to maintain just a