142 lines
5.5 KiB
Scheme
142 lines
5.5 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2015, 2016, 2022 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix monad-repl)
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#:use-module (guix store)
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#:use-module (guix monads)
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#:use-module (guix utils)
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#:use-module (guix packages)
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#:use-module (guix status)
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#:autoload (guix gexp) (lower-object)
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#:use-module ((guix derivations)
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#:select (derivation?
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derivation->output-paths built-derivations))
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#:use-module (ice-9 match)
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#:use-module (ice-9 pretty-print)
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#:use-module (system repl repl)
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#:use-module (system repl common)
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#:use-module (system repl command)
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#:use-module (system base language)
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#:use-module (system base compile)
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#:use-module (srfi srfi-26)
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#:export (run-in-store
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enter-store-monad))
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;;; Comment:
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;;;
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;;; This modules provides a couple of REPL meta-commands that make it easier
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;;; to work with monadic procedures in the store monad.
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;;;
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;;; Code:
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(define* (monad-language monad run #:optional (name 'monad))
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"Return a language with a special evaluator that causes monadic values
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to be \"run\" in MONAD using procedure RUN."
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(let ((scheme (lookup-language 'scheme)))
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(define (evaluate-monadic-expression exp env)
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(let ((mvalue (compile exp #:to 'value #:env env)))
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(run mvalue)))
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(make-language #:name name
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#:title "Monad"
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#:reader (language-reader scheme)
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#:compilers (language-compilers scheme)
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#:decompilers (language-decompilers scheme)
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#:evaluator evaluate-monadic-expression
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#:printer (language-printer scheme)
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#:make-default-environment
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(language-make-default-environment scheme))))
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(define* (default-guile-derivation store #:optional (system (%current-system)))
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"Return the derivation of the default "
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(package-derivation store (default-guile) system))
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(define (store-monad-language store)
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"Return a compiler language for the store monad using STORE."
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(let ((guile (or (%guile-for-build)
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(default-guile-derivation store))))
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(monad-language %store-monad
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(cut run-with-store store <>
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#:guile-for-build guile)
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'store-monad)))
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(define %build-verbosity
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;; Current build verbosity level.
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1)
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(define* (evaluate/print-with-store mvalue #:key build?)
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"Run monadic value MVALUE in the store monad and print its value."
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(with-store store
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(set-build-options store
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#:print-build-trace #t
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#:print-extended-build-trace? #t
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#:multiplexed-build-output? #t)
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(with-status-verbosity %build-verbosity
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(let* ((guile (or (%guile-for-build)
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(default-guile-derivation store)))
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(values (run-with-store store
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(if build?
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(mlet %store-monad ((obj mvalue))
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(if (derivation? obj)
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(mbegin %store-monad
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(built-derivations (list obj))
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(return
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(match (derivation->output-paths obj)
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(((_ . files) ...) files))))
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(return (list obj))))
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(mlet %store-monad ((obj mvalue))
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(return (list obj))))
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#:guile-for-build guile)))
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(for-each (lambda (value)
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(run-hook before-print-hook value)
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(pretty-print value))
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values)))))
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(define-meta-command ((run-in-store guix) repl (form))
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"run-in-store EXP
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Run EXP through the store monad."
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(evaluate/print-with-store (repl-eval repl form)))
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(define-meta-command ((verbosity guix) repl (level))
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"verbosity LEVEL
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Change build verbosity to LEVEL."
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(set! %build-verbosity (repl-eval repl level)))
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(define-meta-command ((lower guix) repl (form))
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"lower OBJECT
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Lower OBJECT into a derivation or store file and return it."
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(evaluate/print-with-store (lower-object (repl-eval repl form))))
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(define-meta-command ((build guix) repl (form))
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"build OBJECT
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Lower OBJECT and build it, returning its output file name(s)."
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(evaluate/print-with-store (lower-object (repl-eval repl form))
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#:build? #t))
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(define-meta-command ((enter-store-monad guix) repl)
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"enter-store-monad
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Enter a REPL for values in the store monad."
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(with-store store
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(let ((new (make-repl (store-monad-language store))))
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;; Force interpretation so that our specially-crafted language evaluator
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;; is actually used.
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(repl-option-set! new 'interp #t)
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(run-repl new))))
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;;; monad-repl.scm ends here
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