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Enhancing `modify-services' to support name in addition to type

From: Brice Waegeneire
Subject: Enhancing `modify-services' to support name in addition to type
Date: Thu, 26 Mar 2020 15:07:40 +0000
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I was thinking of improving `modify-services' by adding the ability to
specify a service to modify based on it's name and not just it's type. This
would allow us to modify singleton services like the ones returned by
`simple-service'. I'm not sure if that's a good idea, that's why I prefer to ask before starting to write a patch. Following is an example of how it
would like when modifying `set-xorg-configuration':

--8<---------------cut here---------------start------------->8---
(define t430-xorg-extra-config "
Section \"InputClass\"
  Identifier \"touchpad\"
  Driver \"synaptics\"
  Option \"HorizTwoFingerScroll\" \"on\"

(define t430-services
  (modify-services workstation-services
     config => (xorg-configuration
                (inherit config)
                (extra-config (list t430-xorg-extra-config))))))
--8<---------------cut here---------------end--------------->8---


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