gexp: Add 'with-imported-modules' macro.
* guix/gexp.scm (<gexp>)[modules]: New field.
(gexp-modules): New procedure.
(gexp->derivation): Use it and append the result to %MODULES.
Update docstring to mark #:modules as deprecated.
(current-imported-modules, with-imported-modules): New macros.
(gexp): Pass CURRENT-IMPORTED-MODULES as second argument to 'gexp'.
(gexp->script): Use and honor 'gexp-modules'; define '%modules'.
* tests/gexp.scm ("gexp->derivation & with-imported-modules")
("gexp->derivation & nested with-imported-modules")
("gexp-modules & ungexp", "gexp-modules & ungexp-splicing"):
New tests.
("program-file"): Use 'with-imported-modules'. Remove #:modules
argument to 'program-file'.
* doc/guix.texi (G-Expressions): Document 'with-imported-modules'.
Mark #:modules of 'gexp->derivation' as deprecated.
* emacs/guix-devel.el: Add syntax for 'with-imported-modules'.
(guix-devel-keywords): Add it.
* .dir-locals.el: Likewise.
This commit is contained in:
Ludovic Courtès
parent
affd7761f3
commit
0bb9929eaa
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@ -59,6 +59,7 @@
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(eval . (put 'run-with-store 'scheme-indent-function 1))
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(eval . (put 'run-with-state 'scheme-indent-function 1))
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(eval . (put 'wrap-program 'scheme-indent-function 1))
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(eval . (put 'with-imported-modules 'scheme-indent-function 1))
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(eval . (put 'call-with-container 'scheme-indent-function 1))
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(eval . (put 'container-excursion 'scheme-indent-function 1))
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@ -3697,6 +3697,30 @@ In the example above, the native build of @var{coreutils} is used, so
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that @command{ln} can actually run on the host; but then the
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cross-compiled build of @var{emacs} is referenced.
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@cindex imported modules, for gexps
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@findex with-imported-modules
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Another gexp feature is @dfn{imported modules}: sometimes you want to be
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able to use certain Guile modules from the ``host environment'' in the
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gexp, so those modules should be imported in the ``build environment''.
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The @code{with-imported-modules} form allows you to express that:
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@example
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(let ((build (with-imported-modules '((guix build utils))
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#~(begin
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(use-modules (guix build utils))
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(mkdir-p (string-append #$output "/bin"))))))
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(gexp->derivation "empty-dir"
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#~(begin
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#$build
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(display "success!\n")
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#t)))
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@end example
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@noindent
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In this example, the @code{(guix build utils)} module is automatically
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pulled into the isolated build environment of our gexp, such that
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@code{(use-modules (guix build utils))} works as expected.
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The syntactic form to construct gexps is summarized below.
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@deffn {Scheme Syntax} #~@var{exp}
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@ -3756,6 +3780,16 @@ G-expressions created by @code{gexp} or @code{#~} are run-time objects
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of the @code{gexp?} type (see below.)
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@end deffn
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@deffn {Scheme Syntax} with-imported-modules @var{modules} @var{body}@dots{}
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Mark the gexps defined in @var{body}@dots{} as requiring @var{modules}
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in their execution environment. @var{modules} must be a list of Guile
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module names, such as @code{'((guix build utils) (guix build gremlin))}.
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This form has @emph{lexical} scope: it has an effect on the gexps
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directly defined in @var{body}@dots{}, but not on those defined, say, in
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procedures called from @var{body}@dots{}.
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@end deffn
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@deffn {Scheme Procedure} gexp? @var{obj}
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Return @code{#t} if @var{obj} is a G-expression.
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@end deffn
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@ -3781,7 +3815,9 @@ stored in a file called @var{script-name}. When @var{target} is true,
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it is used as the cross-compilation target triplet for packages referred
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to by @var{exp}.
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Make @var{modules} available in the evaluation context of @var{exp};
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@var{modules} is deprecated in favor of @code{with-imported-modules}.
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Its meaning is to
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make @var{modules} available in the evaluation context of @var{exp};
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@var{modules} is a list of names of Guile modules searched in
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@var{module-path} to be copied in the store, compiled, and made available in
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the load path during the execution of @var{exp}---e.g., @code{((guix
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@ -216,6 +216,7 @@ to find 'modify-phases' keywords."
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"with-derivation-substitute"
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"with-directory-excursion"
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"with-error-handling"
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"with-imported-modules"
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"with-monad"
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"with-mutex"
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"with-store"))
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@ -306,6 +307,7 @@ Each rule should have a form (SYMBOL VALUE). See `put' for details."
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(with-derivation-substitute 2)
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(with-directory-excursion 1)
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(with-error-handling 0)
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(with-imported-modules 1)
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(with-monad 1)
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(with-mutex 1)
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(with-store 1)
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@ -29,6 +29,7 @@
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#:use-module (ice-9 match)
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#:export (gexp
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gexp?
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with-imported-modules
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gexp-input
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gexp-input?
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@ -98,9 +99,10 @@
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;; "G expressions".
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(define-record-type <gexp>
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(make-gexp references proc)
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(make-gexp references modules proc)
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gexp?
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(references gexp-references) ;list of <gexp-input>
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(modules gexp-self-modules) ;list of module names
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(proc gexp-proc)) ;procedure
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(define (write-gexp gexp port)
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@ -384,6 +386,23 @@ whether this should be considered a \"native\" input or not."
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(set-record-type-printer! <gexp-output> write-gexp-output)
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(define (gexp-modules gexp)
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"Return the list of Guile module names GEXP relies on."
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(delete-duplicates
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(append (gexp-self-modules gexp)
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(append-map (match-lambda
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(($ <gexp-input> (? gexp? exp))
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(gexp-modules exp))
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(($ <gexp-input> (lst ...))
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(append-map (lambda (item)
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(if (gexp? item)
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(gexp-modules item)
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'()))
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lst))
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(_
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'()))
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(gexp-references gexp)))))
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(define raw-derivation
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(store-lift derivation))
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@ -465,7 +484,8 @@ derivation) on SYSTEM; EXP is stored in a file called SCRIPT-NAME. When
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TARGET is true, it is used as the cross-compilation target triplet for
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packages referred to by EXP.
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Make MODULES available in the evaluation context of EXP; MODULES is a list of
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MODULES is deprecated in favor of 'with-imported-modules'. Its meaning is to
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make MODULES available in the evaluation context of EXP; MODULES is a list of
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names of Guile modules searched in MODULE-PATH to be copied in the store,
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compiled, and made available in the load path during the execution of
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EXP---e.g., '((guix build utils) (guix build gnu-build-system)).
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@ -494,7 +514,9 @@ Similarly for DISALLOWED-REFERENCES, which can list items that must not be
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referenced by the outputs.
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The other arguments are as for 'derivation'."
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(define %modules modules)
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(define %modules
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(delete-duplicates
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(append modules (gexp-modules exp))))
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(define outputs (gexp-outputs exp))
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(define (graphs-file-names graphs)
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@ -724,6 +746,17 @@ and in the current monad setting (system type, etc.)"
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(simple-format #f "~a:~a" line column)))
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"<unknown location>")))
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(define-syntax-parameter current-imported-modules
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;; Current list of imported modules.
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(identifier-syntax '()))
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(define-syntax-rule (with-imported-modules modules body ...)
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"Mark the gexps defined in BODY... as requiring MODULES in their execution
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environment."
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(syntax-parameterize ((current-imported-modules
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(identifier-syntax modules)))
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body ...))
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(define-syntax gexp
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(lambda (s)
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(define (collect-escapes exp)
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@ -819,6 +852,7 @@ and in the current monad setting (system type, etc.)"
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(sexp (substitute-references #'exp (zip escapes formals)))
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(refs (map escape->ref escapes)))
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#`(make-gexp (list #,@refs)
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current-imported-modules
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(lambda #,formals
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#,sexp)))))))
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@ -960,8 +994,11 @@ they can refer to each other."
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#:key (modules '()) (guile (default-guile)))
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"Return an executable script NAME that runs EXP using GUILE with MODULES in
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its search path."
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(mlet %store-monad ((modules (imported-modules modules))
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(compiled (compiled-modules modules)))
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(define %modules
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(append (gexp-modules exp) modules))
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(mlet %store-monad ((modules (imported-modules %modules))
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(compiled (compiled-modules %modules)))
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(gexp->derivation name
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(gexp
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(call-with-output-file (ungexp output)
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@ -526,6 +526,18 @@
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get-bytevector-all))))
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files))))))
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(test-equal "gexp-modules & ungexp"
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'((bar) (foo))
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((@@ (guix gexp) gexp-modules)
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#~(foo #$(with-imported-modules '((foo)) #~+)
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#+(with-imported-modules '((bar)) #~-))))
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(test-equal "gexp-modules & ungexp-splicing"
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'((foo) (bar))
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((@@ (guix gexp) gexp-modules)
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#~(foo #$@(list (with-imported-modules '((foo)) #~+)
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(with-imported-modules '((bar)) #~-)))))
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(test-assertm "gexp->derivation #:modules"
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(mlet* %store-monad
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((build -> #~(begin
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@ -540,6 +552,50 @@
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(s (stat (string-append p "/guile/guix/nix"))))
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(return (eq? (stat:type s) 'directory))))))
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(test-assertm "gexp->derivation & with-imported-modules"
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;; Same test as above, but using 'with-imported-modules'.
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(mlet* %store-monad
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((build -> (with-imported-modules '((guix build utils))
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#~(begin
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(use-modules (guix build utils))
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(mkdir-p (string-append #$output "/guile/guix/nix"))
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#t)))
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(drv (gexp->derivation "test-with-modules" build)))
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(mbegin %store-monad
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(built-derivations (list drv))
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(let* ((p (derivation->output-path drv))
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(s (stat (string-append p "/guile/guix/nix"))))
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(return (eq? (stat:type s) 'directory))))))
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(test-assertm "gexp->derivation & nested with-imported-modules"
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(mlet* %store-monad
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((build1 -> (with-imported-modules '((guix build utils))
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#~(begin
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(use-modules (guix build utils))
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(mkdir-p (string-append #$output "/guile/guix/nix"))
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#t)))
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(build2 -> (with-imported-modules '((guix build bournish))
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#~(begin
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(use-modules (guix build bournish)
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(system base compile))
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#+build1
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(call-with-output-file (string-append #$output "/b")
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(lambda (port)
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(write
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(read-and-compile (open-input-string "cd /foo")
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#:from %bournish-language
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#:to 'scheme)
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port))))))
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(drv (gexp->derivation "test-with-modules" build2)))
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(mbegin %store-monad
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(built-derivations (list drv))
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(let* ((p (derivation->output-path drv))
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(s (stat (string-append p "/guile/guix/nix")))
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(b (string-append p "/b")))
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(return (and (eq? (stat:type s) 'directory)
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(equal? '(chdir "/foo")
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(call-with-input-file b read))))))))
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(test-assertm "gexp->derivation #:references-graphs"
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(mlet* %store-monad
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((one (text-file "one" (random-text)))
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@ -676,11 +732,11 @@
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(test-assertm "program-file"
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(let* ((n (random (expt 2 50)))
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(exp (gexp (begin
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(use-modules (guix build utils))
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(display (ungexp n)))))
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(exp (with-imported-modules '((guix build utils))
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(gexp (begin
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(use-modules (guix build utils))
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(display (ungexp n))))))
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(file (program-file "program" exp
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#:modules '((guix build utils))
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#:guile %bootstrap-guile)))
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(mlet* %store-monad ((drv (lower-object file))
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(out -> (derivation->output-path drv)))
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