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services: Document the 'delete' clause of 'modify-services'.

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* doc/guix.texi (Service Reference): Mention the 'delete' clause of
'modify-services'.
* gnu/services.scm (modify-services): Likewise in docstring.
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Ludovic Courtès 2021-11-27 18:38:33 +01:00
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9
doc/guix.texi
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@ -35724,6 +35724,15 @@ are created using @code{define-record-type*}, you can write a succinct
@var{body} that evaluates to the new service parameters by using the @var{body} that evaluates to the new service parameters by using the
@code{inherit} feature that @code{define-record-type*} provides. @code{inherit} feature that @code{define-record-type*} provides.
Clauses can also have the following form:
@lisp
(delete @var{type})
@end lisp
Such a clause removes all services of the given @var{type} from
@var{services}.
@xref{Using the Configuration System}, for example usage. @xref{Using the Configuration System}, for example usage.
@end deffn @end deffn

8
gnu/services.scm
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@ -319,7 +319,13 @@ the resulting list of services. Each clause must have the form:
where TYPE is a service type, such as 'guix-service-type', and VARIABLE is an where TYPE is a service type, such as 'guix-service-type', and VARIABLE is an
identifier that is bound within BODY to the value of the service of that identifier that is bound within BODY to the value of the service of that
TYPE. Consider this example: TYPE.
Clauses can also remove services of a given type:
(delete TYPE)
Consider this example:
(modify-services %base-services (modify-services %base-services
(guix-service-type config => (guix-service-type config =>