1365 lines
54 KiB
Scheme
1365 lines
54 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2018 Clément Lassieur <clement@lassieur.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 grafts)
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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 (srfi srfi-34)
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#:use-module (srfi srfi-35)
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#:use-module (ice-9 match)
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#:export (gexp
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gexp?
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with-imported-modules
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gexp-input
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gexp-input?
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local-file
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local-file?
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local-file-file
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local-file-absolute-file-name
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local-file-name
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local-file-recursive?
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plain-file
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plain-file?
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plain-file-name
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plain-file-content
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computed-file
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computed-file?
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computed-file-name
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computed-file-gexp
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computed-file-options
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program-file
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program-file?
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program-file-name
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program-file-gexp
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program-file-guile
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program-file-module-path
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scheme-file
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scheme-file?
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scheme-file-name
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scheme-file-gexp
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file-append
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file-append?
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file-append-base
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file-append-suffix
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load-path-expression
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gexp-modules
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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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mixed-text-file
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file-union
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directory-union
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imported-files
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imported-modules
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compiled-modules
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define-gexp-compiler
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gexp-compiler?
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file-like?
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lower-object
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lower-inputs
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&gexp-error
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gexp-error?
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&gexp-input-error
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gexp-input-error?
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gexp-error-invalid-input))
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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 modules proc)
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gexp?
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(references gexp-references) ;list of <gexp-input>
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(modules gexp-self-modules) ;list of module names
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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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(gexp-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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;;;
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;;; Methods.
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;;;
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;; Compiler for a type of objects that may be introduced in a gexp.
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(define-record-type <gexp-compiler>
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(gexp-compiler type lower expand)
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gexp-compiler?
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(type gexp-compiler-type) ;record type descriptor
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(lower gexp-compiler-lower)
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(expand gexp-compiler-expand)) ;#f | DRV -> sexp
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(define-condition-type &gexp-error &error
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gexp-error?)
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(define-condition-type &gexp-input-error &gexp-error
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gexp-input-error?
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(input gexp-error-invalid-input))
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(define %gexp-compilers
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;; 'eq?' mapping of record type descriptor to <gexp-compiler>.
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(make-hash-table 20))
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(define (default-expander thing obj output)
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"This is the default expander for \"things\" that appear in gexps. It
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returns its output file name of OBJ's OUTPUT."
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(match obj
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((? derivation? drv)
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(derivation->output-path drv output))
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((? string? file)
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file)))
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(define (register-compiler! compiler)
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"Register COMPILER as a gexp compiler."
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(hashq-set! %gexp-compilers
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(gexp-compiler-type compiler) compiler))
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(define (lookup-compiler object)
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"Search for a compiler for OBJECT. Upon success, return the three argument
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procedure to lower it; otherwise return #f."
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(and=> (hashq-ref %gexp-compilers (struct-vtable object))
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gexp-compiler-lower))
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(define (file-like? object)
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"Return #t if OBJECT leads to a file in the store once unquoted in a
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G-expression; otherwise return #f."
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(and (struct? object) (->bool (lookup-compiler object))))
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(define (lookup-expander object)
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"Search for an expander for OBJECT. Upon success, return the three argument
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procedure to expand it; otherwise return #f."
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(and=> (hashq-ref %gexp-compilers (struct-vtable object))
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gexp-compiler-expand))
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(define* (lower-object obj
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#:optional (system (%current-system))
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#:key target)
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"Return as a value in %STORE-MONAD the derivation or store item
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corresponding to OBJ for SYSTEM, cross-compiling for TARGET if TARGET is true.
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OBJ must be an object that has an associated gexp compiler, such as a
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<package>."
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(match (lookup-compiler obj)
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(#f
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(raise (condition (&gexp-input-error (input obj)))))
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(lower
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(lower obj system target))))
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(define-syntax define-gexp-compiler
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(syntax-rules (=> compiler expander)
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"Define NAME as a compiler for objects matching PREDICATE encountered in
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gexps.
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In the simplest form of the macro, BODY must return a derivation for PARAM, an
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object that matches PREDICATE, for SYSTEM and TARGET (the latter of which is
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#f except when cross-compiling.)
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The more elaborate form allows you to specify an expander:
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(define-gexp-compiler something something?
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compiler => (lambda (param system target) ...)
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expander => (lambda (param drv output) ...))
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The expander specifies how an object is converted to its sexp representation."
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((_ (name (param record-type) system target) body ...)
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(define-gexp-compiler name record-type
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compiler => (lambda (param system target) body ...)
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expander => default-expander))
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((_ name record-type
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compiler => compile
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expander => expand)
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(begin
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(define name
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(gexp-compiler record-type compile expand))
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(register-compiler! name)))))
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(define-gexp-compiler (derivation-compiler (drv <derivation>) system target)
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;; Derivations are the lowest-level representation, so this is the identity
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;; compiler.
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(with-monad %store-monad
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(return drv)))
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;;;
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;;; File declarations.
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;;;
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;; A local file name. FILE is the file name the user entered, which can be a
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;; relative file name, and ABSOLUTE is a promise that computes its canonical
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;; absolute file name. We keep it in a promise to compute it lazily and avoid
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;; repeated 'stat' calls.
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(define-record-type <local-file>
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(%%local-file file absolute name recursive? select?)
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local-file?
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(file local-file-file) ;string
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(absolute %local-file-absolute-file-name) ;promise string
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(name local-file-name) ;string
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(recursive? local-file-recursive?) ;Boolean
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(select? local-file-select?)) ;string stat -> Boolean
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(define (true file stat) #t)
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(define* (%local-file file promise #:optional (name (basename file))
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#:key recursive? (select? true))
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;; This intermediate procedure is part of our ABI, but the underlying
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;; %%LOCAL-FILE is not.
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(%%local-file file promise name recursive? select?))
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(define (absolute-file-name file directory)
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"Return the canonical absolute file name for FILE, which lives in the
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vicinity of DIRECTORY."
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(canonicalize-path
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(cond ((string-prefix? "/" file) file)
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((not directory) file)
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((string-prefix? "/" directory)
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(string-append directory "/" file))
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(else file))))
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(define-syntax local-file
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(lambda (s)
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"Return an object representing local file FILE to add to the store; this
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object can be used in a gexp. If FILE is a relative file name, it is looked
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up relative to the source file where this form appears. FILE will be added to
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the store under NAME--by default the base name of FILE.
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When RECURSIVE? is true, the contents of FILE are added recursively; if FILE
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designates a flat file and RECURSIVE? is true, its contents are added, and its
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permission bits are kept.
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When RECURSIVE? is true, call (SELECT? FILE STAT) for each directory entry,
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where FILE is the entry's absolute file name and STAT is the result of
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'lstat'; exclude entries for which SELECT? does not return true.
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This is the declarative counterpart of the 'interned-file' monadic procedure.
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It is implemented as a macro to capture the current source directory where it
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appears."
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(syntax-case s ()
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((_ file rest ...)
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#'(%local-file file
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(delay (absolute-file-name file (current-source-directory)))
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rest ...))
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((_)
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#'(syntax-error "missing file name"))
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(id
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(identifier? #'id)
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;; XXX: We could return #'(lambda (file . rest) ...). However,
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;; (syntax-source #'id) is #f so (current-source-directory) would not
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;; work. Thus, simply forbid this form.
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#'(syntax-error
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"'local-file' is a macro and cannot be used like this")))))
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(define (local-file-absolute-file-name file)
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"Return the absolute file name for FILE, a <local-file> instance. A
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'system-error' exception is raised if FILE could not be found."
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(force (%local-file-absolute-file-name file)))
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(define-gexp-compiler (local-file-compiler (file <local-file>) system target)
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;; "Compile" FILE by adding it to the store.
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(match file
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(($ <local-file> file (= force absolute) name recursive? select?)
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;; Canonicalize FILE so that if it's a symlink, it is resolved. Failing
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;; to do that, when RECURSIVE? is #t, we could end up creating a dangling
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;; symlink in the store, and when RECURSIVE? is #f 'add-to-store' would
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;; just throw an error, both of which are inconvenient.
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(interned-file absolute name
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#:recursive? recursive? #:select? select?))))
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(define-record-type <plain-file>
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(%plain-file name content references)
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plain-file?
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(name plain-file-name) ;string
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(content plain-file-content) ;string
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(references plain-file-references)) ;list (currently unused)
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(define (plain-file name content)
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"Return an object representing a text file called NAME with the given
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CONTENT (a string) to be added to the store.
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This is the declarative counterpart of 'text-file'."
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;; XXX: For now just ignore 'references' because it's not clear how to use
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;; them in a declarative context.
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(%plain-file name content '()))
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(define-gexp-compiler (plain-file-compiler (file <plain-file>) system target)
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;; "Compile" FILE by adding it to the store.
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(match file
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(($ <plain-file> name content references)
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(text-file name content references))))
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(define-record-type <computed-file>
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(%computed-file name gexp guile options)
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computed-file?
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(name computed-file-name) ;string
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(gexp computed-file-gexp) ;gexp
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(guile computed-file-guile) ;<package>
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(options computed-file-options)) ;list of arguments
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(define* (computed-file name gexp
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#:key guile (options '(#:local-build? #t)))
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"Return an object representing the store item NAME, a file or directory
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computed by GEXP. OPTIONS is a list of additional arguments to pass
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to 'gexp->derivation'.
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This is the declarative counterpart of 'gexp->derivation'."
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(%computed-file name gexp guile options))
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(define-gexp-compiler (computed-file-compiler (file <computed-file>)
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system target)
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;; Compile FILE by returning a derivation whose build expression is its
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;; gexp.
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(match file
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(($ <computed-file> name gexp guile options)
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(if guile
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(mlet %store-monad ((guile (lower-object guile system
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#:target target)))
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(apply gexp->derivation name gexp #:guile-for-build guile
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options))
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(apply gexp->derivation name gexp options)))))
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(define-record-type <program-file>
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(%program-file name gexp guile path)
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program-file?
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(name program-file-name) ;string
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(gexp program-file-gexp) ;gexp
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(guile program-file-guile) ;package
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(path program-file-module-path)) ;list of strings
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(define* (program-file name gexp #:key (guile #f) (module-path %load-path))
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"Return an object representing the executable store item NAME that runs
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GEXP. GUILE is the Guile package used to execute that script. Imported
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modules of GEXP are looked up in MODULE-PATH.
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This is the declarative counterpart of 'gexp->script'."
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(%program-file name gexp guile module-path))
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(define-gexp-compiler (program-file-compiler (file <program-file>)
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system target)
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;; Compile FILE by returning a derivation that builds the script.
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(match file
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(($ <program-file> name gexp guile module-path)
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(gexp->script name gexp
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#:module-path module-path
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#:guile (or guile (default-guile))))))
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|
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(define-record-type <scheme-file>
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(%scheme-file name gexp splice?)
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||
scheme-file?
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(name scheme-file-name) ;string
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||
(gexp scheme-file-gexp) ;gexp
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||
(splice? scheme-file-splice?)) ;Boolean
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||
|
||
(define* (scheme-file name gexp #:key splice?)
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"Return an object representing the Scheme file NAME that contains GEXP.
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||
|
||
This is the declarative counterpart of 'gexp->file'."
|
||
(%scheme-file name gexp splice?))
|
||
|
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(define-gexp-compiler (scheme-file-compiler (file <scheme-file>)
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system target)
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||
;; Compile FILE by returning a derivation that builds the file.
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(match file
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||
(($ <scheme-file> name gexp splice?)
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||
(gexp->file name gexp #:splice? splice?))))
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||
|
||
;; Appending SUFFIX to BASE's output file name.
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||
(define-record-type <file-append>
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||
(%file-append base suffix)
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||
file-append?
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||
(base file-append-base) ;<package> | <derivation> | ...
|
||
(suffix file-append-suffix)) ;list of strings
|
||
|
||
(define (file-append base . suffix)
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||
"Return a <file-append> object that expands to the concatenation of BASE and
|
||
SUFFIX."
|
||
(%file-append base suffix))
|
||
|
||
(define-gexp-compiler file-append-compiler <file-append>
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||
compiler => (lambda (obj system target)
|
||
(match obj
|
||
(($ <file-append> base _)
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||
(lower-object base system #:target target))))
|
||
expander => (lambda (obj lowered output)
|
||
(match obj
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||
(($ <file-append> base suffix)
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||
(let* ((expand (lookup-expander base))
|
||
(base (expand base lowered output)))
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||
(string-append base (string-concatenate suffix)))))))
|
||
|
||
|
||
;;;
|
||
;;; Inputs & outputs.
|
||
;;;
|
||
|
||
;; The input of a gexp.
|
||
(define-record-type <gexp-input>
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||
(%gexp-input thing output native?)
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||
gexp-input?
|
||
(thing gexp-input-thing) ;<package> | <origin> | <derivation> | ...
|
||
(output gexp-input-output) ;string
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||
(native? gexp-input-native?)) ;Boolean
|
||
|
||
(define (write-gexp-input input port)
|
||
(match input
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||
(($ <gexp-input> thing output #f)
|
||
(format port "#<gexp-input ~s:~a>" thing output))
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||
(($ <gexp-input> thing output #t)
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||
(format port "#<gexp-input native ~s:~a>" thing output))))
|
||
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||
(set-record-type-printer! <gexp-input> write-gexp-input)
|
||
|
||
(define* (gexp-input thing ;convenience procedure
|
||
#:optional (output "out")
|
||
#:key native?)
|
||
"Return a new <gexp-input> for the OUTPUT of THING; NATIVE? determines
|
||
whether this should be considered a \"native\" input or not."
|
||
(%gexp-input thing output native?))
|
||
|
||
;; Reference to one of the derivation's outputs, for gexps used in
|
||
;; derivations.
|
||
(define-record-type <gexp-output>
|
||
(gexp-output name)
|
||
gexp-output?
|
||
(name gexp-output-name))
|
||
|
||
(define (write-gexp-output output port)
|
||
(match output
|
||
(($ <gexp-output> name)
|
||
(format port "#<gexp-output ~a>" name))))
|
||
|
||
(set-record-type-printer! <gexp-output> write-gexp-output)
|
||
|
||
(define (gexp-modules gexp)
|
||
"Return the list of Guile module names GEXP relies on. If (gexp? GEXP) is
|
||
false, meaning that GEXP is a plain Scheme object, return the empty list."
|
||
(if (gexp? gexp)
|
||
(delete-duplicates
|
||
(append (gexp-self-modules gexp)
|
||
(append-map (match-lambda
|
||
(($ <gexp-input> (? gexp? exp))
|
||
(gexp-modules exp))
|
||
(($ <gexp-input> (lst ...))
|
||
(append-map (lambda (item)
|
||
(if (gexp? item)
|
||
(gexp-modules item)
|
||
'()))
|
||
lst))
|
||
(_
|
||
'()))
|
||
(gexp-references gexp))))
|
||
'())) ;plain Scheme data type
|
||
|
||
(define* (lower-inputs inputs
|
||
#:key system target)
|
||
"Turn any package from INPUTS into a derivation for SYSTEM; return the
|
||
corresponding input list as a monadic value. When TARGET is true, use it as
|
||
the cross-compilation target triplet."
|
||
(with-monad %store-monad
|
||
(sequence %store-monad
|
||
(map (match-lambda
|
||
(((? struct? thing) sub-drv ...)
|
||
(mlet %store-monad ((drv (lower-object
|
||
thing system #:target target)))
|
||
(return `(,drv ,@sub-drv))))
|
||
(input
|
||
(return input)))
|
||
inputs))))
|
||
|
||
(define* (lower-reference-graphs graphs #:key system target)
|
||
"Given GRAPHS, a list of (FILE-NAME INPUT ...) lists for use as a
|
||
#:reference-graphs argument, lower it such that each INPUT is replaced by the
|
||
corresponding derivation."
|
||
(match graphs
|
||
(((file-names . inputs) ...)
|
||
(mlet %store-monad ((inputs (lower-inputs inputs
|
||
#:system system
|
||
#:target target)))
|
||
(return (map cons file-names inputs))))))
|
||
|
||
(define* (lower-references lst #:key system target)
|
||
"Based on LST, a list of output names and packages, return a list of output
|
||
names and file names suitable for the #:allowed-references argument to
|
||
'derivation'."
|
||
(with-monad %store-monad
|
||
(define lower
|
||
(match-lambda
|
||
((? string? output)
|
||
(return output))
|
||
(($ <gexp-input> thing output native?)
|
||
(mlet %store-monad ((drv (lower-object thing system
|
||
#:target (if native?
|
||
#f target))))
|
||
(return (derivation->output-path drv output))))
|
||
(thing
|
||
(mlet %store-monad ((drv (lower-object thing system
|
||
#:target target)))
|
||
(return (derivation->output-path drv))))))
|
||
|
||
(sequence %store-monad (map lower lst))))
|
||
|
||
(define default-guile-derivation
|
||
;; Here we break the abstraction by talking to the higher-level layer.
|
||
;; Thus, do the resolution lazily to hide the circular dependency.
|
||
(let ((proc (delay
|
||
(let ((iface (resolve-interface '(guix packages))))
|
||
(module-ref iface 'default-guile-derivation)))))
|
||
(lambda (system)
|
||
((force proc) system))))
|
||
|
||
(define* (gexp->derivation name exp
|
||
#:key
|
||
system (target 'current)
|
||
hash hash-algo recursive?
|
||
(env-vars '())
|
||
(modules '())
|
||
(module-path %load-path)
|
||
(guile-for-build (%guile-for-build))
|
||
(graft? (%graft?))
|
||
references-graphs
|
||
allowed-references disallowed-references
|
||
leaked-env-vars
|
||
local-build? (substitutable? #t)
|
||
deprecation-warnings
|
||
(script-name (string-append name "-builder")))
|
||
"Return a derivation NAME that runs EXP (a gexp) with GUILE-FOR-BUILD (a
|
||
derivation) on SYSTEM; EXP is stored in a file called SCRIPT-NAME. When
|
||
TARGET is true, it is used as the cross-compilation target triplet for
|
||
packages referred to by EXP.
|
||
|
||
MODULES is deprecated in favor of 'with-imported-modules'. Its meaning is to
|
||
make MODULES available in the evaluation context of EXP; MODULES is a list of
|
||
names of Guile modules searched in MODULE-PATH to be copied in the store,
|
||
compiled, and made available in the load path during the execution of
|
||
EXP---e.g., '((guix build utils) (guix build gnu-build-system)).
|
||
|
||
GRAFT? determines whether packages referred to by EXP should be grafted when
|
||
applicable.
|
||
|
||
When REFERENCES-GRAPHS is true, it must be a list of tuples of one of the
|
||
following forms:
|
||
|
||
(FILE-NAME PACKAGE)
|
||
(FILE-NAME PACKAGE OUTPUT)
|
||
(FILE-NAME DERIVATION)
|
||
(FILE-NAME DERIVATION OUTPUT)
|
||
(FILE-NAME STORE-ITEM)
|
||
|
||
The right-hand-side of each element of REFERENCES-GRAPHS is automatically made
|
||
an input of the build process of EXP. In the build environment, each
|
||
FILE-NAME contains the reference graph of the corresponding item, in a simple
|
||
text format.
|
||
|
||
ALLOWED-REFERENCES must be either #f or a list of output names and packages.
|
||
In the latter case, the list denotes store items that the result is allowed to
|
||
refer to. Any reference to another store item will lead to a build error.
|
||
Similarly for DISALLOWED-REFERENCES, which can list items that must not be
|
||
referenced by the outputs.
|
||
|
||
DEPRECATION-WARNINGS determines whether to show deprecation warnings while
|
||
compiling modules. It can be #f, #t, or 'detailed.
|
||
|
||
The other arguments are as for 'derivation'."
|
||
(define %modules
|
||
(delete-duplicates
|
||
(append modules (gexp-modules exp))))
|
||
(define outputs (gexp-outputs exp))
|
||
|
||
(define (graphs-file-names graphs)
|
||
;; Return a list of (FILE-NAME . STORE-PATH) pairs made from GRAPHS.
|
||
(map (match-lambda
|
||
;; TODO: Remove 'derivation?' special cases.
|
||
((file-name (? derivation? drv))
|
||
(cons file-name (derivation->output-path drv)))
|
||
((file-name (? derivation? drv) sub-drv)
|
||
(cons file-name (derivation->output-path drv sub-drv)))
|
||
((file-name thing)
|
||
(cons file-name thing)))
|
||
graphs))
|
||
|
||
(mlet* %store-monad (;; The following binding forces '%current-system' and
|
||
;; '%current-target-system' to be looked up at >>=
|
||
;; time.
|
||
(graft? (set-grafting graft?))
|
||
|
||
(system -> (or system (%current-system)))
|
||
(target -> (if (eq? target 'current)
|
||
(%current-target-system)
|
||
target))
|
||
(normals (lower-inputs (gexp-inputs exp)
|
||
#:system system
|
||
#:target target))
|
||
(natives (lower-inputs (gexp-native-inputs exp)
|
||
#:system system
|
||
#:target #f))
|
||
(inputs -> (append normals natives))
|
||
(sexp (gexp->sexp exp
|
||
#:system system
|
||
#:target target))
|
||
(builder (text-file script-name
|
||
(object->string sexp)))
|
||
(modules (if (pair? %modules)
|
||
(imported-modules %modules
|
||
#:system system
|
||
#:module-path module-path
|
||
#:guile guile-for-build)
|
||
(return #f)))
|
||
(compiled (if (pair? %modules)
|
||
(compiled-modules %modules
|
||
#:system system
|
||
#:module-path module-path
|
||
#:guile guile-for-build
|
||
#:deprecation-warnings
|
||
deprecation-warnings)
|
||
(return #f)))
|
||
(graphs (if references-graphs
|
||
(lower-reference-graphs references-graphs
|
||
#:system system
|
||
#:target target)
|
||
(return #f)))
|
||
(allowed (if allowed-references
|
||
(lower-references allowed-references
|
||
#:system system
|
||
#:target target)
|
||
(return #f)))
|
||
(disallowed (if disallowed-references
|
||
(lower-references disallowed-references
|
||
#:system system
|
||
#:target target)
|
||
(return #f)))
|
||
(guile (if guile-for-build
|
||
(return guile-for-build)
|
||
(default-guile-derivation system))))
|
||
(mbegin %store-monad
|
||
(set-grafting graft?) ;restore the initial setting
|
||
(raw-derivation name
|
||
(string-append (derivation->output-path guile)
|
||
"/bin/guile")
|
||
`("--no-auto-compile"
|
||
,@(if (pair? %modules)
|
||
`("-L" ,(derivation->output-path modules)
|
||
"-C" ,(derivation->output-path compiled))
|
||
'())
|
||
,builder)
|
||
#:outputs outputs
|
||
#:env-vars env-vars
|
||
#:system system
|
||
#:inputs `((,guile)
|
||
(,builder)
|
||
,@(if modules
|
||
`((,modules) (,compiled) ,@inputs)
|
||
inputs)
|
||
,@(match graphs
|
||
(((_ . inputs) ...) inputs)
|
||
(_ '())))
|
||
#:hash hash #:hash-algo hash-algo #:recursive? recursive?
|
||
#:references-graphs (and=> graphs graphs-file-names)
|
||
#:allowed-references allowed
|
||
#:disallowed-references disallowed
|
||
#:leaked-env-vars leaked-env-vars
|
||
#:local-build? local-build?
|
||
#:substitutable? substitutable?))))
|
||
|
||
(define* (gexp-inputs exp #:key native?)
|
||
"Return the input list for EXP. When NATIVE? is true, return only native
|
||
references; otherwise, return only non-native references."
|
||
(define (add-reference-inputs ref result)
|
||
(match ref
|
||
(($ <gexp-input> (? gexp? exp) _ #t)
|
||
(if native?
|
||
(append (gexp-inputs exp)
|
||
(gexp-inputs exp #:native? #t)
|
||
result)
|
||
result))
|
||
(($ <gexp-input> (? gexp? exp) _ #f)
|
||
(append (gexp-inputs exp #:native? native?)
|
||
result))
|
||
(($ <gexp-input> (? string? str))
|
||
(if (direct-store-path? str)
|
||
(cons `(,str) result)
|
||
result))
|
||
(($ <gexp-input> (? struct? thing) output n?)
|
||
(if (and (eqv? n? native?) (lookup-compiler thing))
|
||
;; THING is a derivation, or a package, or an origin, etc.
|
||
(cons `(,thing ,output) result)
|
||
result))
|
||
(($ <gexp-input> (lst ...) output n?)
|
||
(fold-right add-reference-inputs result
|
||
;; XXX: For now, automatically convert LST to a list of
|
||
;; gexp-inputs. Inherit N?.
|
||
(map (match-lambda
|
||
((? gexp-input? x)
|
||
(%gexp-input (gexp-input-thing x)
|
||
(gexp-input-output x)
|
||
n?))
|
||
(x
|
||
(%gexp-input x "out" n?)))
|
||
lst)))
|
||
(_
|
||
;; Ignore references to other kinds of objects.
|
||
result)))
|
||
|
||
(fold-right add-reference-inputs
|
||
'()
|
||
(gexp-references exp)))
|
||
|
||
(define gexp-native-inputs
|
||
(cut gexp-inputs <> #:native? #t))
|
||
|
||
(define (gexp-outputs exp)
|
||
"Return the outputs referred to by EXP as a list of strings."
|
||
(define (add-reference-output ref result)
|
||
(match ref
|
||
(($ <gexp-output> name)
|
||
(cons name result))
|
||
(($ <gexp-input> (? gexp? exp))
|
||
(append (gexp-outputs exp) result))
|
||
(($ <gexp-input> (lst ...) output native?)
|
||
;; XXX: Automatically convert LST.
|
||
(add-reference-output (map (match-lambda
|
||
((? gexp-input? x) x)
|
||
(x (%gexp-input x "out" native?)))
|
||
lst)
|
||
result))
|
||
((lst ...)
|
||
(fold-right add-reference-output result lst))
|
||
(_
|
||
result)))
|
||
|
||
(delete-duplicates
|
||
(add-reference-output (gexp-references exp) '())))
|
||
|
||
(define* (gexp->sexp exp #:key
|
||
(system (%current-system))
|
||
(target (%current-target-system)))
|
||
"Return (monadically) the sexp corresponding to EXP for the given OUTPUT,
|
||
and in the current monad setting (system type, etc.)"
|
||
(define* (reference->sexp ref #:optional native?)
|
||
(with-monad %store-monad
|
||
(match ref
|
||
(($ <gexp-output> output)
|
||
;; Output file names are not known in advance but the daemon defines
|
||
;; an environment variable for each of them at build time, so use
|
||
;; that trick.
|
||
(return `((@ (guile) getenv) ,output)))
|
||
(($ <gexp-input> (? gexp? exp) output n?)
|
||
(gexp->sexp exp
|
||
#:system system
|
||
#:target (if (or n? native?) #f target)))
|
||
(($ <gexp-input> (refs ...) output n?)
|
||
(sequence %store-monad
|
||
(map (lambda (ref)
|
||
;; XXX: Automatically convert REF to an gexp-input.
|
||
(reference->sexp
|
||
(if (gexp-input? ref)
|
||
ref
|
||
(%gexp-input ref "out" n?))
|
||
(or n? native?)))
|
||
refs)))
|
||
(($ <gexp-input> (? struct? thing) output n?)
|
||
(let ((target (if (or n? native?) #f target))
|
||
(expand (lookup-expander thing)))
|
||
(mlet %store-monad ((obj (lower-object thing system
|
||
#:target target)))
|
||
;; OBJ must be either a derivation or a store file name.
|
||
(return (expand thing obj output)))))
|
||
(($ <gexp-input> x)
|
||
(return x))
|
||
(x
|
||
(return x)))))
|
||
|
||
(mlet %store-monad
|
||
((args (sequence %store-monad
|
||
(map reference->sexp (gexp-references exp)))))
|
||
(return (apply (gexp-proc exp) args))))
|
||
|
||
(define (syntax-location-string s)
|
||
"Return a string representing the source code location of S."
|
||
(let ((props (syntax-source s)))
|
||
(if props
|
||
(let ((file (assoc-ref props 'filename))
|
||
(line (and=> (assoc-ref props 'line) 1+))
|
||
(column (assoc-ref props 'column)))
|
||
(if file
|
||
(simple-format #f "~a:~a:~a"
|
||
file line column)
|
||
(simple-format #f "~a:~a" line column)))
|
||
"<unknown location>")))
|
||
|
||
(define-syntax-parameter current-imported-modules
|
||
;; Current list of imported modules.
|
||
(identifier-syntax '()))
|
||
|
||
(define-syntax-rule (with-imported-modules modules body ...)
|
||
"Mark the gexps defined in BODY... as requiring MODULES in their execution
|
||
environment."
|
||
(syntax-parameterize ((current-imported-modules
|
||
(identifier-syntax modules)))
|
||
body ...))
|
||
|
||
(define-syntax gexp
|
||
(lambda (s)
|
||
(define (collect-escapes exp)
|
||
;; Return all the 'ungexp' present in EXP.
|
||
(let loop ((exp exp)
|
||
(result '()))
|
||
(syntax-case exp (ungexp
|
||
ungexp-splicing
|
||
ungexp-native
|
||
ungexp-native-splicing)
|
||
((ungexp _)
|
||
(cons exp result))
|
||
((ungexp _ _)
|
||
(cons exp result))
|
||
((ungexp-splicing _ ...)
|
||
(cons exp result))
|
||
((ungexp-native _ ...)
|
||
(cons exp result))
|
||
((ungexp-native-splicing _ ...)
|
||
(cons exp result))
|
||
((exp0 . exp)
|
||
(let ((result (loop #'exp0 result)))
|
||
(loop #'exp result)))
|
||
(_
|
||
result))))
|
||
|
||
(define (escape->ref exp)
|
||
;; Turn 'ungexp' form EXP into a "reference".
|
||
(syntax-case exp (ungexp ungexp-splicing
|
||
ungexp-native ungexp-native-splicing
|
||
output)
|
||
((ungexp output)
|
||
#'(gexp-output "out"))
|
||
((ungexp output name)
|
||
#'(gexp-output name))
|
||
((ungexp thing)
|
||
#'(%gexp-input thing "out" #f))
|
||
((ungexp drv-or-pkg out)
|
||
#'(%gexp-input drv-or-pkg out #f))
|
||
((ungexp-splicing lst)
|
||
#'(%gexp-input lst "out" #f))
|
||
((ungexp-native thing)
|
||
#'(%gexp-input thing "out" #t))
|
||
((ungexp-native drv-or-pkg out)
|
||
#'(%gexp-input drv-or-pkg out #t))
|
||
((ungexp-native-splicing lst)
|
||
#'(%gexp-input lst "out" #t))))
|
||
|
||
(define (substitute-ungexp exp substs)
|
||
;; Given EXP, an 'ungexp' or 'ungexp-native' form, substitute it with
|
||
;; the corresponding form in SUBSTS.
|
||
(match (assoc exp substs)
|
||
((_ id)
|
||
id)
|
||
(_ ;internal error
|
||
(with-syntax ((exp exp))
|
||
#'(syntax-error "error: no 'ungexp' substitution" exp)))))
|
||
|
||
(define (substitute-ungexp-splicing exp substs)
|
||
(syntax-case exp ()
|
||
((exp rest ...)
|
||
(match (assoc #'exp substs)
|
||
((_ id)
|
||
(with-syntax ((id id))
|
||
#`(append id
|
||
#,(substitute-references #'(rest ...) substs))))
|
||
(_
|
||
#'(syntax-error "error: no 'ungexp-splicing' substitution"
|
||
exp))))))
|
||
|
||
(define (substitute-references exp substs)
|
||
;; Return a variant of EXP where all the cars of SUBSTS have been
|
||
;; replaced by the corresponding cdr.
|
||
(syntax-case exp (ungexp ungexp-native
|
||
ungexp-splicing ungexp-native-splicing)
|
||
((ungexp _ ...)
|
||
(substitute-ungexp exp substs))
|
||
((ungexp-native _ ...)
|
||
(substitute-ungexp exp substs))
|
||
(((ungexp-splicing _ ...) rest ...)
|
||
(substitute-ungexp-splicing exp substs))
|
||
(((ungexp-native-splicing _ ...) rest ...)
|
||
(substitute-ungexp-splicing exp substs))
|
||
((exp0 . exp)
|
||
#`(cons #,(substitute-references #'exp0 substs)
|
||
#,(substitute-references #'exp substs)))
|
||
(x #''x)))
|
||
|
||
(syntax-case s (ungexp output)
|
||
((_ exp)
|
||
(let* ((escapes (delete-duplicates (collect-escapes #'exp)))
|
||
(formals (generate-temporaries escapes))
|
||
(sexp (substitute-references #'exp (zip escapes formals)))
|
||
(refs (map escape->ref escapes)))
|
||
#`(make-gexp (list #,@refs)
|
||
current-imported-modules
|
||
(lambda #,formals
|
||
#,sexp)))))))
|
||
|
||
|
||
;;;
|
||
;;; Module handling.
|
||
;;;
|
||
|
||
(define %utils-module
|
||
;; This file provides 'mkdir-p', needed to implement 'imported-files' and
|
||
;; other primitives below. Note: We give the file name relative to this
|
||
;; file you are currently reading; 'search-path' could return a file name
|
||
;; relative to the current working directory.
|
||
(local-file "build/utils.scm"
|
||
"build-utils.scm"))
|
||
|
||
(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) pairs. Each FILE is mapped to FINAL-PATH in the
|
||
resulting store path. FILE can be either a file name, or a file-like object,
|
||
as returned by 'local-file' for example."
|
||
(define file-pair
|
||
(match-lambda
|
||
((final-path . (? string? file-name))
|
||
(mlet %store-monad ((file (interned-file file-name
|
||
(basename final-path))))
|
||
(return (list final-path file))))
|
||
((final-path . file-like)
|
||
(mlet %store-monad ((file (lower-object file-like system)))
|
||
(return (list final-path file))))))
|
||
|
||
(mlet %store-monad ((files (sequence %store-monad
|
||
(map file-pair files))))
|
||
(define build
|
||
(gexp
|
||
(begin
|
||
(primitive-load (ungexp %utils-module)) ;for 'mkdir-p'
|
||
(use-modules (ice-9 match))
|
||
|
||
(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* (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 either names of
|
||
modules to be found in the MODULE-PATH search path, or a module name followed
|
||
by an arrow followed by a file-like object. For example:
|
||
|
||
(imported-modules `((guix build utils)
|
||
(guix gcrypt)
|
||
((guix config) => ,(scheme-file …))))
|
||
|
||
In this example, the first two modules are taken from MODULE-PATH, and the
|
||
last one is created from the given <scheme-file> object."
|
||
(mlet %store-monad ((files
|
||
(mapm %store-monad
|
||
(match-lambda
|
||
(((module ...) '=> file)
|
||
(return
|
||
(cons (module->source-file-name module)
|
||
file)))
|
||
((module ...)
|
||
(let ((f (module->source-file-name module)))
|
||
(return
|
||
(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)
|
||
(deprecation-warnings #f))
|
||
"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."
|
||
(define total (length modules))
|
||
|
||
(mlet %store-monad ((modules (imported-modules modules
|
||
#:system system
|
||
#:guile guile
|
||
#:module-path
|
||
module-path)))
|
||
(define build
|
||
(gexp
|
||
(begin
|
||
(primitive-load (ungexp %utils-module)) ;for 'mkdir-p'
|
||
|
||
(use-modules (ice-9 ftw)
|
||
(ice-9 format)
|
||
(srfi srfi-1)
|
||
(srfi srfi-26)
|
||
(system base compile))
|
||
|
||
(define (regular? file)
|
||
(not (member file '("." ".."))))
|
||
|
||
(define (process-entry entry output processed)
|
||
(if (file-is-directory? entry)
|
||
(let ((output (string-append output "/" (basename entry))))
|
||
(mkdir-p output)
|
||
(process-directory entry output processed))
|
||
(let* ((base (basename entry ".scm"))
|
||
(output (string-append output "/" base ".go")))
|
||
(format #t "[~2@a/~2@a] Compiling '~a'...~%"
|
||
(+ 1 processed) (ungexp total) entry)
|
||
(compile-file entry
|
||
#:output-file output
|
||
#:opts %auto-compilation-options)
|
||
(+ 1 processed))))
|
||
|
||
(define (process-directory directory output processed)
|
||
(let ((entries (map (cut string-append directory "/" <>)
|
||
(scandir directory regular?))))
|
||
(fold (cut process-entry <> output <>)
|
||
processed
|
||
entries)))
|
||
|
||
(setvbuf (current-output-port)
|
||
(cond-expand (guile-2.2 'line) (else _IOLBF)))
|
||
|
||
(set! %load-path (cons (ungexp modules) %load-path))
|
||
(mkdir (ungexp output))
|
||
(chdir (ungexp modules))
|
||
(process-directory "." (ungexp output) 0))))
|
||
|
||
;; TODO: Pass MODULES as an environment variable.
|
||
(gexp->derivation name build
|
||
#:system system
|
||
#:guile-for-build guile
|
||
#:local-build? #t
|
||
#:env-vars
|
||
(case deprecation-warnings
|
||
((#f)
|
||
'(("GUILE_WARN_DEPRECATED" . "no")))
|
||
((detailed)
|
||
'(("GUILE_WARN_DEPRECATED" . "detailed")))
|
||
(else
|
||
'())))))
|
||
|
||
|
||
;;;
|
||
;;; Convenience procedures.
|
||
;;;
|
||
|
||
(define (default-guile)
|
||
;; Lazily resolve 'guile-2.2' (not 'guile-final' because this is for
|
||
;; programs returned by 'program-file' and we don't want to keep references
|
||
;; to several Guile packages). This module must not refer to (gnu …)
|
||
;; modules directly, to avoid circular dependencies, hence this hack.
|
||
(module-ref (resolve-interface '(gnu packages guile))
|
||
'guile-2.2))
|
||
|
||
(define* (load-path-expression modules #:optional (path %load-path))
|
||
"Return as a monadic value a gexp that sets '%load-path' and
|
||
'%load-compiled-path' to point to MODULES, a list of module names. MODULES
|
||
are searched for in PATH."
|
||
(mlet %store-monad ((modules (imported-modules modules
|
||
#:module-path path))
|
||
(compiled (compiled-modules modules
|
||
#:module-path path)))
|
||
(return (gexp (eval-when (expand load eval)
|
||
(set! %load-path
|
||
(cons (ungexp modules) %load-path))
|
||
(set! %load-compiled-path
|
||
(cons (ungexp compiled)
|
||
%load-compiled-path)))))))
|
||
|
||
(define* (gexp->script name exp
|
||
#:key (guile (default-guile))
|
||
(module-path %load-path))
|
||
"Return an executable script NAME that runs EXP using GUILE, with EXP's
|
||
imported modules in its search path. Look up EXP's modules in MODULE-PATH."
|
||
(mlet %store-monad ((set-load-path
|
||
(load-path-expression (gexp-modules exp)
|
||
module-path)))
|
||
(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 '(ungexp set-load-path) port)
|
||
(write '(ungexp exp) port)
|
||
(chmod port #o555))))
|
||
#:module-path module-path)))
|
||
|
||
(define* (gexp->file name exp #:key
|
||
(set-load-path? #t)
|
||
(module-path %load-path)
|
||
(splice? #f))
|
||
"Return a derivation that builds a file NAME containing EXP. When SPLICE?
|
||
is true, EXP is considered to be a list of expressions that will be spliced in
|
||
the resulting file.
|
||
|
||
When SET-LOAD-PATH? is true, emit code in the resulting file to set
|
||
'%load-path' and '%load-compiled-path' to honor EXP's imported modules.
|
||
Lookup EXP's modules in MODULE-PATH."
|
||
(match (if set-load-path? (gexp-modules exp) '())
|
||
(() ;zero modules
|
||
(gexp->derivation name
|
||
(gexp
|
||
(call-with-output-file (ungexp output)
|
||
(lambda (port)
|
||
(for-each (lambda (exp)
|
||
(write exp port))
|
||
'(ungexp (if splice?
|
||
exp
|
||
(gexp ((ungexp exp)))))))))
|
||
#:local-build? #t
|
||
#:substitutable? #f))
|
||
((modules ...)
|
||
(mlet %store-monad ((set-load-path (load-path-expression modules
|
||
module-path)))
|
||
(gexp->derivation name
|
||
(gexp
|
||
(call-with-output-file (ungexp output)
|
||
(lambda (port)
|
||
(write '(ungexp set-load-path) port)
|
||
(for-each (lambda (exp)
|
||
(write exp port))
|
||
'(ungexp (if splice?
|
||
exp
|
||
(gexp ((ungexp exp)))))))))
|
||
#:module-path module-path
|
||
#:local-build? #t
|
||
#:substitutable? #f)))))
|
||
|
||
(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, objects of any type that
|
||
can be used in a gexp: packages, derivations, local file objects, etc. 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
|
||
#:local-build? #t
|
||
#:substitutable? #f))
|
||
|
||
(define* (mixed-text-file name #:rest text)
|
||
"Return an object representing store file NAME containing TEXT. TEXT is a
|
||
sequence of strings and file-like objects, as in:
|
||
|
||
(mixed-text-file \"profile\"
|
||
\"export PATH=\" coreutils \"/bin:\" grep \"/bin\")
|
||
|
||
This is the declarative counterpart of 'text-file*'."
|
||
(define build
|
||
(gexp (call-with-output-file (ungexp output "out")
|
||
(lambda (port)
|
||
(display (string-append (ungexp-splicing text)) port)))))
|
||
|
||
(computed-file name build))
|
||
|
||
(define (file-union name files)
|
||
"Return a <computed-file> that builds a directory containing all of FILES.
|
||
Each item in FILES must be a two-element list where the first element is the
|
||
file name to use in the new directory, and the second element is a gexp
|
||
denoting the target file. Here's an example:
|
||
|
||
(file-union \"etc\"
|
||
`((\"hosts\" ,(plain-file \"hosts\"
|
||
\"127.0.0.1 localhost\"))
|
||
(\"bashrc\" ,(plain-file \"bashrc\"
|
||
\"alias ls='ls --color'\"))))
|
||
|
||
This yields an 'etc' directory containing these two files."
|
||
(computed-file name
|
||
(gexp
|
||
(begin
|
||
(mkdir (ungexp output))
|
||
(chdir (ungexp output))
|
||
(ungexp-splicing
|
||
(map (match-lambda
|
||
((target source)
|
||
(gexp
|
||
(begin
|
||
;; Stat the source to abort early if it does
|
||
;; not exist.
|
||
(stat (ungexp source))
|
||
|
||
(symlink (ungexp source)
|
||
(ungexp target))))))
|
||
files))))))
|
||
|
||
(define* (directory-union name things
|
||
#:key (copy? #f) (quiet? #f)
|
||
(resolve-collision 'warn-about-collision))
|
||
"Return a directory that is the union of THINGS, where THINGS is a list of
|
||
file-like objects denoting directories. For example:
|
||
|
||
(directory-union \"guile+emacs\" (list guile emacs))
|
||
|
||
yields a directory that is the union of the 'guile' and 'emacs' packages.
|
||
|
||
Call RESOLVE-COLLISION when several files collide, passing it the list of
|
||
colliding files. RESOLVE-COLLISION must return the chosen file or #f, in
|
||
which case the colliding entry is skipped altogether.
|
||
|
||
When HARD-LINKS? is true, create hard links instead of symlinks. When QUIET?
|
||
is true, the derivation will not print anything."
|
||
(define symlink
|
||
(if copy?
|
||
(gexp (lambda (old new)
|
||
(if (file-is-directory? old)
|
||
(symlink old new)
|
||
(copy-file old new))))
|
||
(gexp symlink)))
|
||
|
||
(define log-port
|
||
(if quiet?
|
||
(gexp (%make-void-port "w"))
|
||
(gexp (current-error-port))))
|
||
|
||
(match things
|
||
((one)
|
||
;; Only one thing; return it.
|
||
one)
|
||
(_
|
||
(computed-file name
|
||
(with-imported-modules '((guix build union))
|
||
(gexp (begin
|
||
(use-modules (guix build union)
|
||
(srfi srfi-1)) ;for 'first' and 'last'
|
||
|
||
(union-build (ungexp output)
|
||
'(ungexp things)
|
||
|
||
#:log-port (ungexp log-port)
|
||
#:symlink (ungexp symlink)
|
||
#:resolve-collision
|
||
(ungexp resolve-collision)))))))))
|
||
|
||
|
||
;;;
|
||
;;; 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
|