IRC channel logs

<AwesomeAdam54321>Is there a procedure that can strip the list created by (map ...)?

<RhodiumToad>what do you mean by "strip"?

<AwesomeAdam54321>RhodiumToad: (map ...) returns a list like "(a b c)" and I want to turn it into just "a b c"

<RhodiumToad>"a b c" as a string...? or what?

<AwesomeAdam54321>RhodiumToad: as elements

<RhodiumToad>in separate variables?

<RhodiumToad>maybe show an example, it's really not clear what you mean

<AwesomeAdam54321>(map (lambda (name) `,(string->symbol name)) dependencies)

<RhodiumToad>so dependencies is a list of strings and you want a list of symbols?

<AwesomeAdam54321>Yes, but without the opening ( and closing ) in the output

<AwesomeAdam54321>so (php-guzzlehttp-guzzle php-psr-http-client php-http-httplug) should have the these two parentheses removed

<RhodiumToad>but that makes no sense

<RhodiumToad>(a b c) is a list and therefore can be treated as a single value. a b c is not

<AwesomeAdam54321>you're right, there probably isn't a way

<RhodiumToad>what are you trying to do with the result?

<RhodiumToad>also, why is that map not just (map string->symbol dependencies)

<AwesomeAdam54321>RhodiumToad: I want fix a Guix package importer for PHP and the importer outputs a Guix package definition which is scheme

<AwesomeAdam54321>(inputs (list a b c)) and (inputs (list (a b c))) are probably the same, but it's for aesthetics

<RhodiumToad>they're not the same

<RhodiumToad>I wonder if ,@ is what you're looking for?

<RhodiumToad>compare `(foo ,(map string->symbol '("bar" "baz")) quux) vs. `(foo ,@(map string->symbol '("bar" "baz")) quux)

<AwesomeAdam54321>yay it's what I was looking for

<AwesomeAdam54321>what does ,@ do?

<RhodiumToad>it's like , except that it splices in a list rather than substituting a single value

<RhodiumToad>this is within a `... form of course

<RhodiumToad>it's in the manual under "expression syntax" (look for quasiquote and unquote-splicing

<AwesomeAdam54321>thanks, quasiquote felt complicated but it turns out it's simple

<RhodiumToad>quasiquote is just the real name for ` which you already used in your example above

<cow_2001>how do i write end-of-file into a port?

<cow_2001>close it?

<cow_2001>close-input-port, i see

<cow_2001>no

<cow_2001>i am trying to write EOF (^D) into an (open-pipe* OPEN_BOTH …) port

<cow_2001>it's how you end a `yt-dlp -a -` download list

<civodul>cwebber: just close the port

<civodul>er, sorry, that was for cow_2001

<civodul>(hi cwebber! :-))

<cow_2001>hi cwebber! hi civodul!

<cow_2001>oh here it is!

<cow_2001>now, after i (close-port some-port) it, how do i wait for the popened process to complete?

<cow_2001>oh i know!

<cow_2001>waitpid on the port's pid

<cow_2001>no, that's not it. close-port is supposed to waitpid.

<cow_2001>oh no

<cow_2001>i did something real stupid

<cow_2001>it just exits guile and the yt-dlp process then runs in the background

<cow_2001>(close-port yt-dlp-port) is right at the end of the guile script

<flatwhatson>cow_2001: if it's a pipe, you need close-pipe

<cow_2001>oh.

<cow_2001>that's it.

<cow_2001>thank you!

<cwebber>:)

IRC channel logs

2023-04-20.log