[bug#50967] [PATCH 13/14] home: services: configuration: Support file-like objects.

[Andrew Tropin <andrewtropin@gmail.com>]

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On 2021-10-02 19:38, Oleg Pykhalov wrote:

> * gnu/home/services/configuration.scm (interpose): Include content of files.
> (string-or-gexp?): Rename to 'file-or-string-or-gexp?' and check for file-like
> object.
> (serialize-string-or-gexp): Rename to 'serialize-file-or-string-or-gexp'.
> (text-config?): Call 'file-or-string-or-gexp?' intead of 'string-or-gexp?'.
> * guix/scripts/home/import.scm:
> (generate-bash-module+configuration): Don't call slurp-file-gexp.
> ---
>  gnu/home/services/configuration.scm | 14 ++++++++++----
>  guix/scripts/home/import.scm        |  8 +++-----
>  2 files changed, 13 insertions(+), 9 deletions(-)
>
> diff --git a/gnu/home/services/configuration.scm b/gnu/home/services/configuration.scm
> index 5e7743e7d6..39db7a5693 100644
> --- a/gnu/home/services/configuration.scm
> +++ b/gnu/home/services/configuration.scm
> @@ -59,7 +59,12 @@ DELIMITER interposed LS.  Support 'infix and 'suffix GRAMMAR values."
>        (G_ "The GRAMMAR value must be 'infix or 'suffix, but ~a provided.")
>        grammar)))
>    (fold-right (lambda (e acc)
> -		(cons e
> +		(cons (if (file-like? e)
> +                          #~(begin
> +                              (use-modules (ice-9 rdelim))
> +                              (with-fluids ((%default-port-encoding "UTF-8"))
> +                                (with-input-from-file #$e read-string)))

This transformation should not be a part of interpose function,
interpose does know nothing about elements type and doesn't have to
know.  This addition is semantically incorrect and also contradictionary
to docstring.  It also breaks downstream channels.

The version of change in master is different, it doesn't even check
element type.

I'm strongly against this change.  If it necessary to make
transformation of elements of the list it should be done outside of
interpose.

> +                          e)
>  		      (if (and (null? acc) (eq? grammar 'infix))
>  			  acc
>  			  (cons delimiter acc))))
> @@ -79,11 +84,12 @@ the list result in @code{#t} when applying PRED? on them."
>  
>  (define alist? list?)
>  
> -(define (string-or-gexp? sg) (or (string? sg) (gexp? sg)))
> -(define (serialize-string-or-gexp field-name val) "")
> +(define (file-or-string-or-gexp? fsg)
> +  (or (string? fsg) (gexp? fsg) (file-like? fsg)))
> +(define (serialize-file-or-string-or-gexp field-name val) "")
>  
>  (define (text-config? config)
> -  (and (list? config) (every string-or-gexp? config)))
> +  (and (list? config) (every file-or-string-or-gexp? config)))
>  (define (serialize-text-config field-name val)
>    #~(string-append #$@(interpose val "\n" 'suffix)))
>  
> diff --git a/guix/scripts/home/import.scm b/guix/scripts/home/import.scm
> index c977ec3861..611f580e85 100644
> --- a/guix/scripts/home/import.scm
> +++ b/guix/scripts/home/import.scm
> @@ -46,17 +46,15 @@
>                   (home-bash-configuration
>                    ,@(if (file-exists? rc)
>                          `((bashrc
> -                           (list (slurp-file-gexp (local-file ,rc)))))
> +                           (list (local-file ,rc))))
>                          '())
>                    ,@(if (file-exists? profile)
>                          `((bash-profile
> -                           (list (slurp-file-gexp
> -                                  (local-file ,profile)))))
> +                           (list (local-file ,profile))))
>                          '())
>                    ,@(if (file-exists? logout)
>                          `((bash-logout
> -                           (list (slurp-file-gexp
> -                                  (local-file ,logout)))))
> +                           (list (local-file ,logout))))
>                          '()))))))

-- 
Best regards,
Andrew Tropin

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