158 lines
5.5 KiB
Scheme
158 lines
5.5 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2018, 2019 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 scripts repl)
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#:use-module (guix ui)
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#:use-module (guix scripts)
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#:use-module (guix repl)
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#:use-module (guix utils)
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#:use-module (guix packages)
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#:use-module (gnu packages)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-37)
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#:use-module (ice-9 match)
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#:use-module (rnrs bytevectors)
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#:autoload (system repl repl) (start-repl)
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#:autoload (system repl server)
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(make-tcp-server-socket make-unix-domain-server-socket)
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#:export (guix-repl))
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;;; Commentary:
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;;;
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;;; This command provides a Guile REPL
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(define %default-options
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`((type . guile)))
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(define %options
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(list (option '(#\h "help") #f #f
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(lambda args
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(show-help)
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(exit 0)))
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(option '(#\V "version") #f #f
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(lambda args
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(show-version-and-exit "guix repl")))
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(option '(#\t "type") #t #f
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(lambda (opt name arg result)
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(alist-cons 'type (string->symbol arg) result)))
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(option '("listen") #t #f
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(lambda (opt name arg result)
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(alist-cons 'listen arg result)))))
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(define (show-help)
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(display (G_ "Usage: guix repl [OPTIONS...]
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Start a Guile REPL in the Guix execution environment.\n"))
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(display (G_ "
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-t, --type=TYPE start a REPL of the given TYPE"))
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(newline)
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(display (G_ "
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-h, --help display this help and exit"))
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(display (G_ "
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-V, --version display version information and exit"))
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(newline)
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(show-bug-report-information))
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(define user-module
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;; Module where we execute user code.
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(let ((module (resolve-module '(guix-user) #f #f #:ensure #t)))
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(beautify-user-module! module)
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module))
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(define (call-with-connection spec thunk)
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"Dynamically-bind the current input and output ports according to SPEC and
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call THUNK."
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(if (not spec)
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(thunk)
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;; Note: the "PROTO:" prefix in SPEC is here so that we can eventually
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;; parse things like "fd:123" in a non-ambiguous way.
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(match (string-index spec #\:)
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(#f
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(leave (G_ "~A: invalid listen specification~%") spec))
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(index
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(let ((protocol (string-take spec index))
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(address (string-drop spec (+ index 1))))
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(define socket
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(match protocol
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("tcp"
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(make-tcp-server-socket #:port (string->number address)))
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("unix"
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(make-unix-domain-server-socket #:path address))
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(_
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(leave (G_ "~A: unsupported protocol family~%")
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protocol))))
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(listen socket 10)
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(let loop ()
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(match (accept socket)
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((connection . address)
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(if (= AF_UNIX (sockaddr:fam address))
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(info (G_ "accepted connection~%"))
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(info (G_ "accepted connection from ~a~%")
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(inet-ntop (sockaddr:fam address)
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(sockaddr:addr address))))
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(dynamic-wind
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(const #t)
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(lambda ()
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(parameterize ((current-input-port connection)
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(current-output-port connection))
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(thunk)))
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(lambda ()
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(false-if-exception (close-port connection))
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(info (G_ "connection closed~%"))))))
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(loop)))))))
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(define (guix-repl . args)
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(define opts
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;; Return the list of package names.
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(args-fold* args %options
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(lambda (opt name arg result)
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(leave (G_ "~A: unrecognized option~%") name))
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(lambda (arg result)
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(leave (G_ "~A: extraneous argument~%") arg))
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%default-options))
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(with-error-handling
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(let ((type (assoc-ref opts 'type)))
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(call-with-connection (assoc-ref opts 'listen)
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(lambda ()
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(case type
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((guile)
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(save-module-excursion
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(lambda ()
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(set-current-module user-module)
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(and=> (getenv "HOME")
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(lambda (home)
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(let ((guile (string-append home "/.guile")))
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(when (file-exists? guile)
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(load guile)))))
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;; Do not exit repl on SIGINT.
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((@@ (ice-9 top-repl) call-with-sigint)
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(lambda ()
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(start-repl))))))
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((machine)
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(machine-repl))
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(else
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(leave (G_ "~a: unknown type of REPL~%") type))))))))
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;; Local Variables:
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;; eval: (put 'call-with-connection 'scheme-indent-function 1)
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;; End:
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