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doc: Add example of 'bash-extension'.

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* doc/guix.texi (Shells Home Services): Add 'bash-extension' example.
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Ludovic Courtès 2022-07-14 01:04:59 +02:00
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@ -39663,6 +39663,23 @@ contents of the extensions will be added to the end of the corresponding
Bash configuration files (@pxref{Bash Startup Files,,, bash, The GNU
Bash Reference Manual}.
For example, here is how you would define a service that extends the
Bash service such that @file{~/.bash_profile} defines an additional
environment variable, @env{PS1}:
@lisp
(define bash-fancy-prompt-service
(simple-service 'bash-fancy-prompt
home-bash-service-type
(home-bash-extension
(environment-variables
'(("PS1" . "\\u \\wλ "))))))
@end lisp
You would then add @code{bash-fancy-prompt-service} to the list in the
@code{services} field of your @code{home-environment}. The reference of
@code{home-bash-extension} follows.
@deftp {Data Type} home-bash-extension
Available @code{home-bash-extension} fields are: