7e75a6739b
Fixes a regression introduced in f9efe56.
* guix/gexp.scm (gexp-outputs): Add call to 'delete-duplicates'.
* tests/gexp.scm ("output list, combined gexps, duplicate output"): New
test.
771 lines
30 KiB
Scheme
771 lines
30 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2015 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 gexp)
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#:use-module (guix store)
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#:use-module (guix monads)
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#:use-module (guix derivations)
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#:use-module (guix packages)
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#:use-module (guix utils)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-9)
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#:use-module (srfi srfi-9 gnu)
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#:use-module (srfi srfi-26)
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#:use-module (ice-9 match)
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#:export (gexp
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gexp?
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gexp->derivation
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gexp->file
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gexp->script
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text-file*
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imported-files
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imported-modules
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compiled-modules))
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;;; Commentary:
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;;;
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;;; This module implements "G-expressions", or "gexps". Gexps are like
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;;; S-expressions (sexps), with two differences:
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;;;
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;;; 1. References (un-quotations) to derivations or packages in a gexp are
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;;; replaced by the corresponding output file name; in addition, the
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;;; 'ungexp-native' unquote-like form allows code to explicitly refer to
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;;; the native code of a given package, in case of cross-compilation;
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;;;
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;;; 2. Gexps embed information about the derivations they refer to.
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;;;
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;;; Gexps make it easy to write to files Scheme code that refers to store
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;;; items, or to write Scheme code to build derivations.
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;;;
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;;; Code:
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;; "G expressions".
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(define-record-type <gexp>
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(make-gexp references natives proc)
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gexp?
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(references gexp-references) ; ((DRV-OR-PKG OUTPUT) ...)
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(natives gexp-native-references) ; ((DRV-OR-PKG OUTPUT) ...)
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(proc gexp-proc)) ; procedure
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(define (write-gexp gexp port)
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"Write GEXP on PORT."
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(display "#<gexp " port)
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;; Try to write the underlying sexp. Now, this trick doesn't work when
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;; doing things like (ungexp-splicing (gexp ())) because GEXP's procedure
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;; tries to use 'append' on that, which fails with wrong-type-arg.
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(false-if-exception
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(write (apply (gexp-proc gexp)
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(append (gexp-references gexp)
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(gexp-native-references gexp)))
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port))
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(format port " ~a>"
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(number->string (object-address gexp) 16)))
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(set-record-type-printer! <gexp> write-gexp)
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;; Reference to one of the derivation's outputs, for gexps used in
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;; derivations.
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(define-record-type <output-ref>
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(output-ref name)
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output-ref?
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(name output-ref-name))
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(define raw-derivation
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(store-lift derivation))
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(define* (lower-inputs inputs
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#:key system target)
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"Turn any package from INPUTS into a derivation for SYSTEM; return the
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corresponding input list as a monadic value. When TARGET is true, use it as
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the cross-compilation target triplet."
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(with-monad %store-monad
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(sequence %store-monad
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(map (match-lambda
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(((? package? package) sub-drv ...)
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(mlet %store-monad
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((drv (if target
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(package->cross-derivation package target
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system)
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(package->derivation package system))))
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(return `(,drv ,@sub-drv))))
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(((? origin? origin) sub-drv ...)
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(mlet %store-monad ((drv (origin->derivation origin)))
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(return `(,drv ,@sub-drv))))
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(input
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(return input)))
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inputs))))
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(define* (lower-reference-graphs graphs #:key system target)
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"Given GRAPHS, a list of (FILE-NAME INPUT ...) lists for use as a
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#:reference-graphs argument, lower it such that each INPUT is replaced by the
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corresponding derivation."
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(match graphs
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(((file-names . inputs) ...)
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(mlet %store-monad ((inputs (lower-inputs inputs
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#:system system
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#:target target)))
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(return (map cons file-names inputs))))))
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(define* (lower-references lst #:key system target)
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"Based on LST, a list of output names and packages, return a list of output
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names and file names suitable for the #:allowed-references argument to
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'derivation'."
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;; XXX: Currently outputs other than "out" are not supported, and things
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;; other than packages aren't either.
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(with-monad %store-monad
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(define lower
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(match-lambda
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((? string? output)
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(return output))
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((? package? package)
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(mlet %store-monad ((drv
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(if target
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(package->cross-derivation package target
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#:system system
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#:graft? #f)
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(package->derivation package system
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#:graft? #f))))
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(return (derivation->output-path drv))))))
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(sequence %store-monad (map lower lst))))
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(define* (gexp->derivation name exp
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#:key
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system (target 'current)
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hash hash-algo recursive?
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(env-vars '())
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(modules '())
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(module-path %load-path)
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(guile-for-build (%guile-for-build))
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(graft? (%graft?))
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references-graphs
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allowed-references
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local-build?)
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"Return a derivation NAME that runs EXP (a gexp) with GUILE-FOR-BUILD (a
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derivation) on SYSTEM. When TARGET is true, it is used as the
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cross-compilation target triplet for 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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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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GRAFT? determines whether packages referred to by EXP should be grafted when
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applicable.
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When REFERENCES-GRAPHS is true, it must be a list of tuples of one of the
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following forms:
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(FILE-NAME PACKAGE)
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(FILE-NAME PACKAGE OUTPUT)
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(FILE-NAME DERIVATION)
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(FILE-NAME DERIVATION OUTPUT)
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(FILE-NAME STORE-ITEM)
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The right-hand-side of each element of REFERENCES-GRAPHS is automatically made
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an input of the build process of EXP. In the build environment, each
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FILE-NAME contains the reference graph of the corresponding item, in a simple
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text format.
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ALLOWED-REFERENCES must be either #f or a list of output names and packages.
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In the latter case, the list denotes store items that the result is allowed to
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refer to. Any reference to another store item will lead to a build error.
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The other arguments are as for 'derivation'."
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(define %modules modules)
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(define outputs (gexp-outputs exp))
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(define (graphs-file-names graphs)
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;; Return a list of (FILE-NAME . STORE-PATH) pairs made from GRAPHS.
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(map (match-lambda
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((file-name (? derivation? drv))
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(cons file-name (derivation->output-path drv)))
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((file-name (? derivation? drv) sub-drv)
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(cons file-name (derivation->output-path drv sub-drv)))
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((file-name thing)
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(cons file-name thing)))
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graphs))
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(mlet* %store-monad (;; The following binding forces '%current-system' and
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;; '%current-target-system' to be looked up at >>=
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;; time.
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(graft? (set-grafting graft?))
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(system -> (or system (%current-system)))
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(target -> (if (eq? target 'current)
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(%current-target-system)
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target))
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(normals (lower-inputs (gexp-inputs exp)
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#:system system
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#:target target))
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(natives (lower-inputs (gexp-native-inputs exp)
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#:system system
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#:target #f))
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(inputs -> (append normals natives))
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(sexp (gexp->sexp exp
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#:system system
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#:target target))
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(builder (text-file (string-append name "-builder")
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(object->string sexp)))
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(modules (if (pair? %modules)
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(imported-modules %modules
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#:system system
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#:module-path module-path
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#:guile guile-for-build)
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(return #f)))
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(compiled (if (pair? %modules)
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(compiled-modules %modules
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#:system system
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#:module-path module-path
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#:guile guile-for-build)
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(return #f)))
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(graphs (if references-graphs
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(lower-reference-graphs references-graphs
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#:system system
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#:target target)
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(return #f)))
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(allowed (if allowed-references
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(lower-references allowed-references
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#:system system
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#:target target)
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(return #f)))
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(guile (if guile-for-build
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(return guile-for-build)
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(package->derivation (default-guile)
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system))))
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(mbegin %store-monad
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(set-grafting graft?) ;restore the initial setting
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(raw-derivation name
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(string-append (derivation->output-path guile)
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"/bin/guile")
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`("--no-auto-compile"
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,@(if (pair? %modules)
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`("-L" ,(derivation->output-path modules)
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"-C" ,(derivation->output-path compiled))
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'())
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,builder)
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#:outputs outputs
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#:env-vars env-vars
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#:system system
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#:inputs `((,guile)
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(,builder)
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,@(if modules
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`((,modules) (,compiled) ,@inputs)
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inputs)
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,@(match graphs
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(((_ . inputs) ...) inputs)
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(_ '())))
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#:hash hash #:hash-algo hash-algo #:recursive? recursive?
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#:references-graphs (and=> graphs graphs-file-names)
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#:allowed-references allowed
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#:local-build? local-build?))))
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(define* (gexp-inputs exp #:optional (references gexp-references))
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"Return the input list for EXP, using REFERENCES to get its list of
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references."
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(define (add-reference-inputs ref result)
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(match ref
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(((? derivation?) (? string?))
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(cons ref result))
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(((? package?) (? string?))
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(cons ref result))
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(((? origin?) (? string?))
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(cons ref result))
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((? gexp? exp)
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(append (gexp-inputs exp references) result))
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(((? string? file))
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(if (direct-store-path? file)
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(cons ref result)
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result))
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((refs ...)
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(fold-right add-reference-inputs result refs))
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(_
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;; Ignore references to other kinds of objects.
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result)))
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(fold-right add-reference-inputs
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'()
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(references exp)))
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(define gexp-native-inputs
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(cut gexp-inputs <> gexp-native-references))
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(define (gexp-outputs exp)
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"Return the outputs referred to by EXP as a list of strings."
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(define (add-reference-output ref result)
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(match ref
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(($ <output-ref> name)
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(cons name result))
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((? gexp? exp)
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(append (gexp-outputs exp) result))
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((lst ...)
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(fold-right add-reference-output result lst))
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(_
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result)))
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(delete-duplicates
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(add-reference-output (gexp-references exp) '())))
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(define* (gexp->sexp exp #:key
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(system (%current-system))
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(target (%current-target-system)))
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"Return (monadically) the sexp corresponding to EXP for the given OUTPUT,
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and in the current monad setting (system type, etc.)"
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(define* (reference->sexp ref #:optional native?)
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(with-monad %store-monad
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(match ref
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(((? derivation? drv) (? string? output))
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(return (derivation->output-path drv output)))
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(((? package? p) (? string? output))
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(package-file p
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#:output output
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#:system system
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#:target (if native? #f target)))
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(((? origin? o) (? string? output))
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(mlet %store-monad ((drv (origin->derivation o)))
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(return (derivation->output-path drv output))))
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(($ <output-ref> output)
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;; Output file names are not known in advance but the daemon defines
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;; an environment variable for each of them at build time, so use
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;; that trick.
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(return `((@ (guile) getenv) ,output)))
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((? gexp? exp)
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(gexp->sexp exp
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#:system system
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#:target (if native? #f target)))
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(((? string? str))
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(return (if (direct-store-path? str) str ref)))
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((refs ...)
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(sequence %store-monad
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(map (cut reference->sexp <> native?) refs)))
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(x
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(return x)))))
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(mlet %store-monad
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((args (sequence %store-monad
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(append (map reference->sexp (gexp-references exp))
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(map (cut reference->sexp <> #t)
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(gexp-native-references exp))))))
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(return (apply (gexp-proc exp) args))))
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(define (canonicalize-reference ref)
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"Return a canonical variant of REF, which adds any missing output part in
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package/derivation references."
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(match ref
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((? package? p)
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`(,p "out"))
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((? origin? o)
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`(,o "out"))
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((? derivation? d)
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`(,d "out"))
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(((? package?) (? string?))
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ref)
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(((? origin?) (? string?))
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ref)
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(((? derivation?) (? string?))
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ref)
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((? string? s)
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(if (direct-store-path? s) `(,s) s))
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((refs ...)
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(map canonicalize-reference refs))
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(x x)))
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(define (syntax-location-string s)
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"Return a string representing the source code location of S."
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(let ((props (syntax-source s)))
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(if props
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(let ((file (assoc-ref props 'filename))
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(line (and=> (assoc-ref props 'line) 1+))
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(column (assoc-ref props 'column)))
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(if file
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(simple-format #f "~a:~a:~a"
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file line column)
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(simple-format #f "~a:~a" line column)))
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"<unknown location>")))
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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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;; Return all the 'ungexp' present in EXP.
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(let loop ((exp exp)
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(result '()))
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(syntax-case exp (ungexp ungexp-splicing)
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((ungexp _)
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(cons exp result))
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((ungexp _ _)
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(cons exp result))
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((ungexp-splicing _ ...)
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(cons exp result))
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((exp0 exp ...)
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(let ((result (loop #'exp0 result)))
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(fold loop result #'(exp ...))))
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(_
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result))))
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(define (collect-native-escapes exp)
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;; Return all the 'ungexp-native' forms present in EXP.
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(let loop ((exp exp)
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(result '()))
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(syntax-case exp (ungexp-native ungexp-native-splicing)
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((ungexp-native _)
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(cons exp result))
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((ungexp-native _ _)
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(cons exp result))
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((ungexp-native-splicing _ ...)
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(cons exp result))
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((exp0 exp ...)
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(let ((result (loop #'exp0 result)))
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(fold loop result #'(exp ...))))
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(_
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result))))
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(define (escape->ref exp)
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;; Turn 'ungexp' form EXP into a "reference".
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(syntax-case exp (ungexp ungexp-splicing
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ungexp-native ungexp-native-splicing
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output)
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((ungexp output)
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#'(output-ref "out"))
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((ungexp output name)
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#'(output-ref name))
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((ungexp thing)
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#'thing)
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((ungexp drv-or-pkg out)
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#'(list drv-or-pkg out))
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((ungexp-splicing lst)
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#'lst)
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((ungexp-native thing)
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#'thing)
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((ungexp-native drv-or-pkg out)
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#'(list drv-or-pkg out))
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((ungexp-native-splicing lst)
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#'lst)))
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(define (substitute-ungexp exp substs)
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;; Given EXP, an 'ungexp' or 'ungexp-native' form, substitute it with
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;; the corresponding form in SUBSTS.
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(match (assoc exp substs)
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((_ id)
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id)
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(_
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#'(syntax-error "error: no 'ungexp' substitution"
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#'ref))))
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(define (substitute-ungexp-splicing exp substs)
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(syntax-case exp ()
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((exp rest ...)
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(match (assoc #'exp substs)
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((_ id)
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(with-syntax ((id id))
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#`(append id
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#,(substitute-references #'(rest ...) substs))))
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(_
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#'(syntax-error "error: no 'ungexp-splicing' substitution"
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#'ref))))))
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(define (substitute-references exp substs)
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;; Return a variant of EXP where all the cars of SUBSTS have been
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;; replaced by the corresponding cdr.
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(syntax-case exp (ungexp ungexp-native
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ungexp-splicing ungexp-native-splicing)
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((ungexp _ ...)
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(substitute-ungexp exp substs))
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((ungexp-native _ ...)
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(substitute-ungexp exp substs))
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(((ungexp-splicing _ ...) rest ...)
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(substitute-ungexp-splicing exp substs))
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(((ungexp-native-splicing _ ...) rest ...)
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(substitute-ungexp-splicing exp substs))
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((exp0 exp ...)
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#`(cons #,(substitute-references #'exp0 substs)
|
||
#,(substitute-references #'(exp ...) substs)))
|
||
(x #''x)))
|
||
|
||
(syntax-case s (ungexp output)
|
||
((_ exp)
|
||
(let* ((normals (delete-duplicates (collect-escapes #'exp)))
|
||
(natives (delete-duplicates (collect-native-escapes #'exp)))
|
||
(escapes (append normals natives))
|
||
(formals (generate-temporaries escapes))
|
||
(sexp (substitute-references #'exp (zip escapes formals)))
|
||
(refs (map escape->ref normals))
|
||
(nrefs (map escape->ref natives)))
|
||
#`(make-gexp (map canonicalize-reference (list #,@refs))
|
||
(map canonicalize-reference (list #,@nrefs))
|
||
(lambda #,formals
|
||
#,sexp)))))))
|
||
|
||
|
||
;;;
|
||
;;; Module handling.
|
||
;;;
|
||
|
||
(define %mkdir-p-definition
|
||
;; The code for 'mkdir-p' is copied from (guix build utils). We use it in
|
||
;; derivations that cannot use the #:modules argument of 'gexp->derivation'
|
||
;; precisely because they implement that functionality.
|
||
(gexp
|
||
(define (mkdir-p dir)
|
||
(define absolute?
|
||
(string-prefix? "/" dir))
|
||
|
||
(define not-slash
|
||
(char-set-complement (char-set #\/)))
|
||
|
||
(let loop ((components (string-tokenize dir not-slash))
|
||
(root (if absolute? "" ".")))
|
||
(match components
|
||
((head tail ...)
|
||
(let ((path (string-append root "/" head)))
|
||
(catch 'system-error
|
||
(lambda ()
|
||
(mkdir path)
|
||
(loop tail path))
|
||
(lambda args
|
||
(if (= EEXIST (system-error-errno args))
|
||
(loop tail path)
|
||
(apply throw args))))))
|
||
(() #t))))))
|
||
|
||
(define* (imported-files files
|
||
#:key (name "file-import")
|
||
(system (%current-system))
|
||
(guile (%guile-for-build)))
|
||
"Return a derivation that imports FILES into STORE. FILES must be a list
|
||
of (FINAL-PATH . FILE-NAME) pairs; each FILE-NAME is read from the file
|
||
system, imported, and appears under FINAL-PATH in the resulting store path."
|
||
(define file-pair
|
||
(match-lambda
|
||
((final-path . file-name)
|
||
(mlet %store-monad ((file (interned-file file-name
|
||
(basename final-path))))
|
||
(return (list final-path file))))))
|
||
|
||
(mlet %store-monad ((files (sequence %store-monad
|
||
(map file-pair files))))
|
||
(define build
|
||
(gexp
|
||
(begin
|
||
(use-modules (ice-9 match))
|
||
|
||
(ungexp %mkdir-p-definition)
|
||
|
||
(mkdir (ungexp output)) (chdir (ungexp output))
|
||
(for-each (match-lambda
|
||
((final-path store-path)
|
||
(mkdir-p (dirname final-path))
|
||
(symlink store-path final-path)))
|
||
'(ungexp files)))))
|
||
|
||
;; TODO: Pass FILES as an environment variable so that BUILD remains
|
||
;; exactly the same regardless of FILES: less disk space, and fewer
|
||
;; 'add-to-store' RPCs.
|
||
(gexp->derivation name build
|
||
#:system system
|
||
#:guile-for-build guile
|
||
#:local-build? #t)))
|
||
|
||
(define search-path*
|
||
;; A memoizing version of 'search-path' so 'imported-modules' does not end
|
||
;; up looking for the same files over and over again.
|
||
(memoize search-path))
|
||
|
||
(define* (imported-modules modules
|
||
#:key (name "module-import")
|
||
(system (%current-system))
|
||
(guile (%guile-for-build))
|
||
(module-path %load-path))
|
||
"Return a derivation that contains the source files of MODULES, a list of
|
||
module names such as `(ice-9 q)'. All of MODULES must be in the MODULE-PATH
|
||
search path."
|
||
;; TODO: Determine the closure of MODULES, build the `.go' files,
|
||
;; canonicalize the source files through read/write, etc.
|
||
(let ((files (map (lambda (m)
|
||
(let ((f (string-append
|
||
(string-join (map symbol->string m) "/")
|
||
".scm")))
|
||
(cons f (search-path* module-path f))))
|
||
modules)))
|
||
(imported-files files #:name name #:system system
|
||
#:guile guile)))
|
||
|
||
(define* (compiled-modules modules
|
||
#:key (name "module-import-compiled")
|
||
(system (%current-system))
|
||
(guile (%guile-for-build))
|
||
(module-path %load-path))
|
||
"Return a derivation that builds a tree containing the `.go' files
|
||
corresponding to MODULES. All the MODULES are built in a context where
|
||
they can refer to each other."
|
||
(mlet %store-monad ((modules (imported-modules modules
|
||
#:system system
|
||
#:guile guile
|
||
#:module-path
|
||
module-path)))
|
||
(define build
|
||
(gexp
|
||
(begin
|
||
(use-modules (ice-9 ftw)
|
||
(ice-9 match)
|
||
(srfi srfi-26)
|
||
(system base compile))
|
||
|
||
(ungexp %mkdir-p-definition)
|
||
|
||
(define (regular? file)
|
||
(not (member file '("." ".."))))
|
||
|
||
(define (process-directory directory output)
|
||
(let ((entries (map (cut string-append directory "/" <>)
|
||
(scandir directory regular?))))
|
||
(for-each (lambda (entry)
|
||
(if (file-is-directory? entry)
|
||
(let ((output (string-append output "/"
|
||
(basename entry))))
|
||
(mkdir-p output)
|
||
(process-directory entry output))
|
||
(let* ((base (string-drop-right
|
||
(basename entry)
|
||
4)) ;.scm
|
||
(output (string-append output "/" base
|
||
".go")))
|
||
(compile-file entry
|
||
#:output-file output
|
||
#:opts
|
||
%auto-compilation-options))))
|
||
entries)))
|
||
|
||
(set! %load-path (cons (ungexp modules) %load-path))
|
||
(mkdir (ungexp output))
|
||
(chdir (ungexp modules))
|
||
(process-directory "." (ungexp output)))))
|
||
|
||
;; TODO: Pass MODULES as an environment variable.
|
||
(gexp->derivation name build
|
||
#:system system
|
||
#:guile-for-build guile
|
||
#:local-build? #t)))
|
||
|
||
|
||
;;;
|
||
;;; Convenience procedures.
|
||
;;;
|
||
|
||
(define (default-guile)
|
||
;; Lazily resolve 'guile-final'. This module must not refer to (gnu …)
|
||
;; modules directly, to avoid circular dependencies, hence this hack.
|
||
(module-ref (resolve-interface '(gnu packages commencement))
|
||
'guile-final))
|
||
|
||
(define* (gexp->script name exp
|
||
#:key (modules '()) (guile (default-guile)))
|
||
"Return an executable script NAME that runs EXP using GUILE with MODULES in
|
||
its search path."
|
||
(mlet %store-monad ((modules (imported-modules modules))
|
||
(compiled (compiled-modules modules)))
|
||
(gexp->derivation name
|
||
(gexp
|
||
(call-with-output-file (ungexp output)
|
||
(lambda (port)
|
||
;; Note: that makes a long shebang. When the store
|
||
;; is /gnu/store, that fits within the 128-byte
|
||
;; limit imposed by Linux, but that may go beyond
|
||
;; when running tests.
|
||
(format port
|
||
"#!~a/bin/guile --no-auto-compile~%!#~%"
|
||
(ungexp guile))
|
||
|
||
;; Write the 'eval-when' form so that it can be
|
||
;; compiled.
|
||
(write
|
||
'(eval-when (expand load eval)
|
||
(set! %load-path
|
||
(cons (ungexp modules) %load-path))
|
||
(set! %load-compiled-path
|
||
(cons (ungexp compiled)
|
||
%load-compiled-path)))
|
||
port)
|
||
(write '(ungexp exp) port)
|
||
(chmod port #o555)))))))
|
||
|
||
(define (gexp->file name exp)
|
||
"Return a derivation that builds a file NAME containing EXP."
|
||
(gexp->derivation name
|
||
(gexp
|
||
(call-with-output-file (ungexp output)
|
||
(lambda (port)
|
||
(write '(ungexp exp) port))))
|
||
#:local-build? #t))
|
||
|
||
(define* (text-file* name #:rest text)
|
||
"Return as a monadic value a derivation that builds a text file containing
|
||
all of TEXT. TEXT may list, in addition to strings, packages, derivations,
|
||
and store file names; the resulting store file holds references to all these."
|
||
(define builder
|
||
(gexp (call-with-output-file (ungexp output "out")
|
||
(lambda (port)
|
||
(display (string-append (ungexp-splicing text)) port)))))
|
||
|
||
(gexp->derivation name builder))
|
||
|
||
|
||
;;;
|
||
;;; Syntactic sugar.
|
||
;;;
|
||
|
||
(eval-when (expand load eval)
|
||
(define* (read-ungexp chr port #:optional native?)
|
||
"Read an 'ungexp' or 'ungexp-splicing' form from PORT. When NATIVE? is
|
||
true, use 'ungexp-native' and 'ungexp-native-splicing' instead."
|
||
(define unquote-symbol
|
||
(match (peek-char port)
|
||
(#\@
|
||
(read-char port)
|
||
(if native?
|
||
'ungexp-native-splicing
|
||
'ungexp-splicing))
|
||
(_
|
||
(if native?
|
||
'ungexp-native
|
||
'ungexp))))
|
||
|
||
(match (read port)
|
||
((? symbol? symbol)
|
||
(let ((str (symbol->string symbol)))
|
||
(match (string-index-right str #\:)
|
||
(#f
|
||
`(,unquote-symbol ,symbol))
|
||
(colon
|
||
(let ((name (string->symbol (substring str 0 colon)))
|
||
(output (substring str (+ colon 1))))
|
||
`(,unquote-symbol ,name ,output))))))
|
||
(x
|
||
`(,unquote-symbol ,x))))
|
||
|
||
(define (read-gexp chr port)
|
||
"Read a 'gexp' form from PORT."
|
||
`(gexp ,(read port)))
|
||
|
||
;; Extend the reader
|
||
(read-hash-extend #\~ read-gexp)
|
||
(read-hash-extend #\$ read-ungexp)
|
||
(read-hash-extend #\+ (cut read-ungexp <> <> #t)))
|
||
|
||
;;; gexp.scm ends here
|