Re: Getting the name of file-like objects

[Maxime Devos]

Justin Veilleux schreef op vr 01-04-2022 om 16:29 [-0400]:
> (define (unzip f)
>   (computed-file (string-append (name f) "-unzipped")
>     #~(begin
>         (system* (string-append #$unzip "/bin/unzip")

(unrelated) you can do #+(file-append unzip "/bin/unzip") here.  The
'file-append' is not very important here, but the #+ is.  The
difference between #+ (cf. 'native-inputs) and #$ (cf. 'inputs') is
important when cross-compiling.

Also, I would use 'invoke' instead of 'system*' here -- 'invoke' throws
an exception if it fails (making the derivation fail to build), whereas
'system*' silently returns an integer.

>                  "-d" #$output
>                  #$file))
>          #$out))
> ```
> 
>     Is there someting which ressembles the imaginary `name` function
>       I used above?

computed-file-name, local-file-name, package-name ...  I don't think
there's some generic procedure for this.

Greetings,
Maxime.

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