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01:11 lewis1711: is there a construct like "try and do (this), if that returns an error, do (this) instead" ?
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01:11 lewis1711: err, where the two (this) are different things
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01:40 jonrafkind: lewis1711, `with-handlers', at least with that you could make up such a construct
01:41 lewis1711: thats a starting point, thanks
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01:41 lewis1711: I am mainly trying to write a function where you can pass undefined variables in
01:47 Natalkas_pms: jonrafkind, you never answer my quaestions with such love.
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06:21 mentus: hi all
06:22 mentus: i am new here
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06:22 mentus: i am using racket for fun and for refreshing my programming knowledge
06:23 mentus: i got to know about racket/scheme at my university in the first year course
06:23 mentus: i really like this language
06:23 mentus: now i am doing some exercises for my own
06:23 mentus: and i have a concrete question
06:24 mentus: i am exercises with programming tree structures
06:24 mentus: i would like to graphically print the defined trees
06:24 mentus: i was thinking about using the slideshow library
06:24 mentus: do You have any experiences using that for trees?
07:17 eli: mentus: Might not be a best fit, but ask on the list -- there might be some code somewhere.
07:17 mentus: Thanks for tip eli
07:18 mentus: i will take a look, but still try to implement something which can print directly in REPL with standard library
07:18 eli: mentus: Better to start from some existing code.
07:18 eli: BTW, there is code that draws graphs that is used by redex and the module browser.
07:19 eli: It's not using slideshow, and I don't know if it's in shape to be used outside of these tools, but it won't hurt to ask.
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07:21 kingping: (moin)
07:22 mentus: yes, i saw some post suggesting redex
07:22 kingping: Is there some kind of backtrace info I can add to an exception when raising one to allow a developer debug the code?
07:23 mentus: but for that i need to know how to use regular expressions, don't i?
07:30 Demosthenex: eli:  i refuse to believe you sleep
07:33 Demosthenex: so if i'm making a list that i want expanded without the extra braces,ie: (func (1 2 3)) vs (func 1 2 3) where i made a syntax entry of (1 2 3), where do i look?
07:35 kingping: maybe '(1 2 3) or (list 1 2 3) ?
07:36 Demosthenex: *ponder* yeah, i'm still fighting with this syntax thing
07:36 Demosthenex: i think i've got it down pat for individual replacements...
07:36 Demosthenex: i'm trying to make a list of items to pass now, and getting too many layers
07:37 kingping: (map (lambda (x) (+ x)) (list 1 2 3))  ?
07:39 eli: mentus: exceptions already have backtrace information -- that's the continuation marks field, which is a kind of a user-extensible stacktrace thing.
07:39 kingping: rudybot: (map (lambda (x) (+ x)) (list 1 2 3))
07:39 rudybot: kingping: ; Value: (1 2 3)
07:39 eli: Demosthenex: In this case I'm writing a test, but I do sleep, occasionally.
07:41 kingping: eli: So I suspect I can determine as to where the exception occured, and what functions are called in turn.
07:42 eli: kingping: Yes, roughly.
07:42 eli: rudybot: (define (foo x) (/ x 0))
07:42 rudybot: eli: your racket sandbox is ready
07:42 rudybot: eli: Done.
07:42 eli: rudybot: (define (bar x) (+ (foo x) 1))
07:42 rudybot: eli: Done.
07:43 eli: rudybot: (define e (with-handlers ([(lambda (_) #t) values]) (foo 4)))
07:43 rudybot: eli: Done.
07:43 eli: rudybot: (exn-message e)
07:43 rudybot: eli: ; Value: "/: division by zero"
07:43 eli: rudybot: (exn-continuation-marks e)
07:43 rudybot: eli: ; Value: #<continuation-mark-set>
07:43 eli: rudybot: (continuation-mark-set->context (exn-continuation-marks e))
07:43 rudybot: eli: ; Value: ((foo . #(struct:srcloc eval 1 0 1 24)) (call-with-limits . #(struct:srcloc #<path:/usr/local/plt/collects/racket/sandbox.rkt> 333 0 13350 1825)) (call-with-custodian-shutdown . #(struct:srcloc #<path:/usr/local/plt/collects/racket/sandbox.rkt> 383 0 15343 326)) (call-with-break-parameterization . #(struct:srcloc #<path:/usr/local/plt/collects/racket/private/more-scheme.rkt> 158 2 5099 519)) (loop . #(struct:srcloc #<path:/usr/
07:43 eli: rudybot: (map car (continuation-mark-set->context (exn-continuation-marks e)))
07:43 rudybot: eli: ; Value: (foo call-with-limits call-with-custodian-shutdown call-with-break-parameterization loop)
07:43 kingping: Oh great. Thank you eli. ^^
07:44 eli: That list is your stack trace.
07:44 eli: It's a list of pairs, each one has the name of the function (if any) and its location (again, if any).
07:44 eli: In the above case you see some context from the sandbox that rudybot is making all code run in.
07:47 kingping: Yes, that's helpful
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08:59 Demosthenex: is there a standard way of naming syntax tamplate vars to id them in the template?
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09:14 clklein: "to id them in the template"?
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09:27 Demosthenes: ugh, got knocked
09:28 clklein: Demosthenes: What do you mean by "to id them in the template?"
09:29 Demosthenes: i saw a code piece that did ?var in the templates, i was curious if there was a standard
09:31 clklein: Used the name `?var' for a template variable? No, I wouldn't say that's a convention.
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10:55 Demosthenes: hrm.
10:55 Demosthenes: i still can't seem to splice proper
10:57 samth: Demosthenes, can you give an example?
10:58 Demosthenes: samth: yeah, i'm posting to pastebin :P
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11:05 Demosthenes: nm, i got it...
11:05 Demosthenes: was trying to splice using #,@, turned out not needed
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11:13 Demosthenes: omg, i'm loving scheme. this is what this project should have been all along
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11:17 askhader: Which project?
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14:54 jonrafkind: (require redex) used to necessitate using 'gracket', right? its nice that i can do it in the command line repl now
15:09 clklein: yes, you used to have to use redex/reduction-semantics to avoid the GUI baggage
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16:16 Natalkas_pms: jonrafkind, what place does the eval function have in your model?
16:16 Natalkas_pms: Is (eval some-symbol) still a symbol?
16:17 jonrafkind: if some-symbol is bound to an identifier whose value is a symbol it is
16:18 Natalkas_pms: Can strings be bound to identifiers whose  values are symbols?
16:18 Natalkas_pms: Immutable strings, that is.
16:18 jonrafkind: no
16:20 Natalkas_pms: Hmm
16:20 Natalkas_pms: jonrafkind,
16:20 Natalkas_pms: But you say that 'jonrafkind is a symbol.
16:20 Natalkas_pms: Surely this cannot be bound to anything?
16:20 Natalkas_pms: Only jonrafkind can
16:20 jonrafkind: ok lets do this later
16:20 Natalkas_pms: No
16:20 Natalkas_pms: =(
16:20 Natalkas_pms: I wish to make you see the evil of your ways.
16:20 Natalkas_pms: So that you can turn
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19:34 (nick) Natalkas_pms -> talibs_pms
19:35 (nick) talibs_pms -> pms_ul_talib
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20:23 Demosthenes: man, thats awesome
20:24 Demosthenes: i think i'm hooked on racket. between the builtin regexp, snooze, and macros, i'm now parsing text reports (ala mainframe) with typechecking, direcly into sql
20:24 Demosthenes: with only the bare minimum code for each ;]
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20:50 pms_ul_talib: All it needs is a way to forbid republicans how to vote.
20:50 pms_ul_talib: but it'sll get there
20:50 pms_ul_talib: It's totally amazing
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