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doc: Use G-Expressions for package definition example.

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* doc/guix.texi (Build Phases): Use G-Expressions for example.

Co-authored-by: Nicolas Goaziou <mail@nicolasgoaziou.fr>
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
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Bruno Victal 2023-05-06 15:19:40 +01:00 committed by Ludovic Courtès
parent aaa0e7b3f8
commit 8ffe52df47
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@ -10140,23 +10140,31 @@ phase before the @code{build} phase, called
;; other fields omitted
(build-system gnu-build-system)
(arguments
'(#:phases (modify-phases %standard-phases
(delete 'configure)
(add-before 'build 'set-prefix-in-makefile
(lambda* (#:key outputs #:allow-other-keys)
;; Modify the makefile so that its
;; 'PREFIX' variable points to "out".
(let ((out (assoc-ref outputs "out")))
(substitute* "Makefile"
(("PREFIX =.*")
(string-append "PREFIX = "
out "\n")))))))))))
(list
#:phases
#~(modify-phases %standard-phases
(delete 'configure)
(add-before 'build 'set-prefix-in-makefile
(lambda* (#:key inputs #:allow-other-keys)
;; Modify the makefile so that its
;; 'PREFIX' variable points to #$output and
;; 'XMLLINT' points to the correct path.
(substitute* "Makefile"
(("PREFIX =.*")
(string-append "PREFIX = " #$output "\n"))
(("XMLLINT =.*")
(string-append "XMLLINT = "
(search-input-file inputs "/bin/xmllint")
"\n"))))))))))
@end lisp
The new phase that is inserted is written as an anonymous procedure,
introduced with @code{lambda*}; it honors the @code{outputs} parameter
we have seen before. @xref{Build Utilities}, for more about the helpers
used by this phase, and for more examples of @code{modify-phases}.
introduced with @code{lambda*}; it looks for the @file{xmllint}
executable under a @file{/bin} directory among the package's inputs
(@pxref{package Reference}). It also honors the @code{outputs} parameter
we have seen before. @xref{Build Utilities}, for more about
the helpers used by this phase, and for more examples of
@code{modify-phases}.
@cindex code staging
@cindex staging, of code