Re: Running a shell command with home-run-on-change-service-type

[Jelle Licht]

Elias Kueny <elias.kueny@posteo.net> writes:

Hello Elias!

Buyer beware; I am not a G-expression guru. Having said that...

> Hello,
>
> I'm trying to extend the home-run-on-change-service-type service to run the 
> fish command "fisher update" when the file ~/.config/fish/fish_plugins 
> changed, so that fisher plugins are installed or removed by guix home 
> reconfigure.
>
> My service definitions are:
>
>> (define-module (modules shells)
>>   #:use-module (guix gexp)
>>   #:use-module (gnu packages)
>>   #:use-module (gnu services)
>>   #:use-module (gnu home services)
>>   #:use-module (gnu home services shells))
>>
>> (define-public fish-services
>>             (list
>>              (simple-service 'fisher-update-on-change
>>                              home-run-on-change-service-type
>>                              `(("files/.config/fish/fish_plugins"
>>                                 #~(system* #$(file-append fish "/bin/fish") 
>> "-c" "fisher update"))))

... here you quasi-quote the service extension configuration with
"`". To make use of a gexp in the expression, we need to unquote the gexp
expression, so replace "#~" by ",#~".

HTH and gets you unstuck!
- Jelle