94 lines
3.5 KiB
Scheme
94 lines
3.5 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2015, 2016 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 (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-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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(with-store store
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(let* ((guile (or (%guile-for-build)
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(default-guile-derivation store)))
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(value (run-with-store store (repl-eval repl form)
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#:guile-for-build guile)))
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(run-hook before-print-hook value)
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(pretty-print value))))
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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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