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Add (guix repl).

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* guix/scripts/repl.scm: Use (guix repl).
(self-quoting?, machine-repl): Remove.
* guix/repl.scm: New file.
* Makefile.am (MODULES): Add it.
This commit is contained in:
Ludovic Courtès 2019-06-10 17:09:35 +02:00
parent 2ca41030d5
commit 92a4087bf4
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GPG key ID: 090B11993D9AEBB5
3 changed files with 90 additions and 53 deletions
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56
guix/scripts/repl.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -19,6 +19,7 @@
(define-module (guix scripts repl)
#:use-module (guix ui)
#:use-module (guix scripts)
#:use-module (guix repl)
#:use-module (guix utils)
#:use-module (guix packages)
#:use-module (gnu packages)
@ -29,8 +30,7 @@
#:autoload (system repl repl) (start-repl)
#:autoload (system repl server)
(make-tcp-server-socket make-unix-domain-server-socket)
#:export (machine-repl
guix-repl))
#:export (guix-repl))
;;; Commentary:
;;;
@ -68,62 +68,12 @@ Start a Guile REPL in the Guix execution environment.\n"))
(newline)
(show-bug-report-information))
(define (self-quoting? x)
"Return #t if X is self-quoting."
(letrec-syntax ((one-of (syntax-rules ()
((_) #f)
((_ pred rest ...)
(or (pred x)
(one-of rest ...))))))
(one-of symbol? string? pair? null? vector?
bytevector? number? boolean?)))
(define user-module
;; Module where we execute user code.
(let ((module (resolve-module '(guix-user) #f #f #:ensure #t)))
(beautify-user-module! module)
module))
(define* (machine-repl #:optional
(input (current-input-port))
(output (current-output-port)))
"Run a machine-usable REPL over ports INPUT and OUTPUT.
The protocol of this REPL is meant to be machine-readable and provides proper
support to represent multiple-value returns, exceptions, objects that lack a
read syntax, and so on. As such it is more convenient and robust than parsing
Guile's REPL prompt."
(define (value->sexp value)
(if (self-quoting? value)
`(value ,value)
`(non-self-quoting ,(object-address value)
,(object->string value))))
(write `(repl-version 0 0) output)
(newline output)
(force-output output)
(let loop ()
(match (read input)
((? eof-object?) #t)
(exp
(catch #t
(lambda ()
(let ((results (call-with-values
(lambda ()
(primitive-eval exp))
list)))
(write `(values ,@(map value->sexp results))
output)
(newline output)
(force-output output)))
(lambda (key . args)
(write `(exception ,key ,@(map value->sexp args)))
(newline output)
(force-output output)))
(loop)))))
(define (call-with-connection spec thunk)
"Dynamically-bind the current input and output ports according to SPEC and
call THUNK."