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<ArneBab>unmatched-paren: this is SRFI-105, wisp just re-uses that because it neatly solves a problem without having to do any non-standard stuff :-)

<chrislck>sneek: botsnack

<sneek>:)

<lechner>Hi, both resolve-module and resolve-interface raise exceptions when a named module cannot be found. (They do not return #false as documented.) How may I test whether a module is available before using it, please? Thanks! https://www.gnu.org/software/guile/manual/html_node/Module-System-Reflection.html#Module-System-Reflection

<lampilelo>lechner: you can do (false-if-exception (resolve-interface ...))

<lampilelo>or this if you don't want to discard all errors: (and=> (resolve-module '(srfi goo) #:ensure #f) module-public-interface)

<lechner>lampilelo: thanks!

<lechner>Hi, should 'end' in substring be strictly less than string-length, due to zero-start indexing? https://www.gnu.org/software/guile/manual/html_node/String-Selection.html#String-Selection

<lampilelo>substring doc addresses that: 0 <= START <= END <= ‘(string-length STR)’

<lampilelo>or am i misunderstanding something?

<lechner>lampilelo: actually, i think i misread. end is exclusive

<lechner>a bit of a misnomer, perhaps. it could be called 'discard-start'

<lechner>but the 'exclusive' part works well when stripping comments with string-index

<lampilelo>isn't it a convention to call it 'end'? it's the same in c++ for example

<lechner>lampilelo: dunno, i have never used c++ in earnest

<lechner>lampilelo: C's strncpy and c++'s string::substr seem to take a length, leaving the arithmetic to the caller https://www.cplusplus.com/reference/string/string/substr/

<lechner>but i like guile's interface

<lampilelo>in c++ std::end gives you a pointer/iterator to the element past the end of data, so basically outside the container, and other functions that expect it as input also call it 'end'

<lampilelo>i think this is the first time i mentioned c++ on #guile, lol

<lechner>they seem so different

<lechner>Hi, does Guile have a string-split with limit, akin to Perl's split(regex, string, max-terms) or a lazy language's 'take max-terms' ?

<lampilelo>lechner: not to my knowledge, you can use take and drop (and others) from srfi-1 to remove unwanted stuff from the result

<lilyp>lechner: w.r.t. std::end, if you use iterators in c++, the end item is also excluded, just like the end position in guile's substring

<lilyp>you never dereference the std::end iterator, that'd be UB

<lilyp>same in Guile, you don't do (string-ref s (string-length s)), because string-ref is only valid on 0 <= K < END.

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<chrislck>sneek: botsnack

<sneek>:)

<lechner>Hi, is the init file ~/.guile is ever called when Guile starts from C via scm_with_guile()? What about scm_shell() ? Thanks!

<stis>Hello guilers!

<lampilelo>lechner: afaik it is loaded only when you're opening a repl with `guile` command

<lechner>lampilelo: thanks!

<lechner>Hi, is there a "not equal" comparison predicate for integers, please? https://www.gnu.org/software/guile/manual/html_node/Comparison.html#Comparison

<lilyp>lechner: (negate =)?

<lechner>lilyp: thanks!

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<lechner>Hi, how does one interpret an error message like this one, please? http://ix.io/3ZtS

<lechner>i get the wrong type part, but which file, function or line number, please?

<lilyp>you're in the interpreter, there's no debug info

IRC channel logs

2022-06-05.log