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Move record utilities to (guix records).

Browse source 
* guix/utils.scm (define-record-type*): Move to...
* guix/records.scm: ... here.  New file.
* guix/build-system.scm, guix/packages.scm: Use it.
* guix/gnu-maintenance.scm: Likewise.
  (official-gnu-packages)[alist->record]: Remove.
* guix/scripts/substitute-binary.scm: Likewise.
  (alist->record, object->fields): Remove.
* tests/utils.scm ("define-record-type*", "define-record-type* with
  letrec* behavior", "define-record-type* & inherit",
  "define-record-type* & inherit & letrec* behavior",
  "define-record-type* & thunked", "define-record-type* & thunked &
  default", "define-record-type* & thunked & inherited"): Move to...
* tests/records.scm: ... here.  New file.
This commit is contained in:
Ludovic Courtès 2013-05-12 15:46:16 +02:00
parent 9b1ef2f323
commit c0cd1b3ea7
9 changed files with 368 additions and 307 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

22
Makefile.am
View file

@ -35,6 +35,7 @@ MODULES = \
guix/scripts/substitute-binary.scm \
guix/scripts/refresh.scm \
guix/base32.scm \
guix/records.scm \
guix/utils.scm \
guix/serialization.scm \
guix/nar.scm \
@ -85,7 +86,7 @@ MODULES = \
gnu/packages/cpio.scm \
gnu/packages/cppi.scm \
gnu/packages/cross-base.scm \
gnu/packages/cryptsetup.scm \
gnu/packages/cryptsetup.scm \
gnu/packages/curl.scm \
gnu/packages/cyrus-sasl.scm \
gnu/packages/dejagnu.scm \
@ -121,11 +122,11 @@ MODULES = \
gnu/packages/icu4c.scm \
gnu/packages/idutils.scm \
gnu/packages/indent.scm \
gnu/packages/irssi.scm \
gnu/packages/irssi.scm \
gnu/packages/ld-wrapper.scm \
gnu/packages/less.scm \
gnu/packages/lesstif.scm \
gnu/packages/libapr.scm \
gnu/packages/libapr.scm \
gnu/packages/libdaemon.scm \
gnu/packages/libevent.scm \
gnu/packages/libffi.scm \
@ -156,7 +157,7 @@ MODULES = \
gnu/packages/ncurses.scm \
gnu/packages/netpbm.scm \
gnu/packages/nettle.scm \
gnu/packages/ocaml.scm \
gnu/packages/ocaml.scm \
gnu/packages/oggvorbis.scm \
gnu/packages/openldap.scm \
gnu/packages/openssl.scm \
@ -176,22 +177,22 @@ MODULES = \
gnu/packages/rsync.scm \
gnu/packages/samba.scm \
gnu/packages/scheme.scm \
gnu/packages/screen.scm \
gnu/packages/screen.scm \
gnu/packages/shishi.scm \
gnu/packages/smalltalk.scm \
gnu/packages/sqlite.scm \
gnu/packages/sqlite.scm \
gnu/packages/ssh.scm \
gnu/packages/subversion.scm \
gnu/packages/subversion.scm \
gnu/packages/system.scm \
gnu/packages/tcl.scm \
gnu/packages/tcsh.scm \
gnu/packages/tcsh.scm \
gnu/packages/texinfo.scm \
gnu/packages/texlive.scm \
gnu/packages/time.scm \
gnu/packages/tmux.scm \
gnu/packages/tmux.scm \
gnu/packages/tor.scm \
gnu/packages/version-control.scm \
gnu/packages/vim.scm \
gnu/packages/vim.scm \
gnu/packages/vpn.scm \
gnu/packages/w3m.scm \
gnu/packages/wdiff.scm \
@ -313,6 +314,7 @@ SCM_TESTS = \
tests/builders.scm \
tests/derivations.scm \
tests/ui.scm \
tests/records.scm \
tests/utils.scm \
tests/build-utils.scm \
tests/packages.scm \

4
guix/build-system.scm
View file

@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -17,7 +17,7 @@
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix build-system)
#:use-module (guix utils)
#:use-module (guix records)
#:export (build-system
build-system?
build-system-name

7
guix/gnu-maintenance.scm
View file

@ -32,6 +32,7 @@ (define-module (guix gnu-maintenance)
#:use-module (guix ftp-client)
#:use-module (guix ui)
#:use-module (guix utils)
#:use-module (guix records)
#:use-module (guix packages)
#:use-module ((guix download) #:select (download-to-store))
#:use-module (guix gnupg)
@ -150,12 +151,6 @@ (define (match-field str)
(remove null-list? state)
(match-field line))))
(define (alist->record alist make keys)
;; Apply MAKE, which should be a syntactic constructor, to the
;; values associated with KEYS in ALIST.
(let ((args (map (cut assoc-ref alist <>) keys)))
(apply make args)))
(reverse
(map (lambda (alist)
(alist->record alist

1
guix/packages.scm
View file

@ -18,6 +18,7 @@
(define-module (guix packages)
#:use-module (guix utils)
#:use-module (guix records)
#:use-module (guix store)
#:use-module (guix base32)
#:use-module (guix derivations)

214
guix/records.scm Normal file
View file

@ -0,0 +1,214 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix records)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-26)
#:use-module (ice-9 match)
#:export (define-record-type*
alist->record
object->fields))
;;; Commentary:
;;;
;;; Utilities for dealing with Scheme records.
;;;
;;; Code:
(define-syntax define-record-type*
(lambda (s)
"Define the given record type such that an additional \"syntactic
constructor\" is defined, which allows instances to be constructed with named
field initializers, à la SRFI-35, as well as default values."
(define (make-syntactic-constructor type name ctor fields thunked defaults)
"Make the syntactic constructor NAME for TYPE, that calls CTOR, and
expects all of FIELDS to be initialized. DEFAULTS is the list of
FIELD/DEFAULT-VALUE tuples, and THUNKED is the list of identifiers of
thunked fields."
(with-syntax ((type type)
(name name)
(ctor ctor)
(expected fields)
(defaults defaults))
#`(define-syntax name
(lambda (s)
(define (record-inheritance orig-record field+value)
;; Produce code that returns a record identical to
;; ORIG-RECORD, except that values for the FIELD+VALUE alist
;; prevail.
(define (field-inherited-value f)
(and=> (find (lambda (x)
(eq? f (car (syntax->datum x))))
field+value)
car))
#`(make-struct type 0
#,@(map (lambda (field index)
(or (field-inherited-value field)
#`(struct-ref #,orig-record
#,index)))
'expected
(iota (length 'expected)))))
(define (thunked-field? f)
(memq (syntax->datum f) '#,thunked))
(define (field-bindings field+value)
;; Return field to value bindings, for use in `letrec*' below.
(map (lambda (field+value)
(syntax-case field+value ()
((field value)
#`(field
#,(if (thunked-field? #'field)
#'(lambda () value)
#'value)))))
field+value))
(syntax-case s (inherit #,@fields)
((_ (inherit orig-record) (field value) (... ...))
#`(letrec* #,(field-bindings #'((field value) (... ...)))
#,(record-inheritance #'orig-record
#'((field value) (... ...)))))
((_ (field value) (... ...))
(let ((fields (map syntax->datum #'(field (... ...))))
(dflt (map (match-lambda
((f v)
(list (syntax->datum f) v)))
#'defaults)))
(define (field-value f)
(or (and=> (find (lambda (x)
(eq? f (car (syntax->datum x))))
#'((field value) (... ...)))
car)
(let ((value
(car (assoc-ref dflt
(syntax->datum f)))))
(if (thunked-field? f)
#`(lambda () #,value)
value))))
(let-syntax ((error*
(syntax-rules ()
((_ fmt args (... ...))
(syntax-violation 'name
(format #f fmt args
(... ...))
s)))))
(let ((fields (append fields (map car dflt))))
(cond ((lset= eq? fields 'expected)
#`(letrec* #,(field-bindings
#'((field value) (... ...)))
(ctor #,@(map field-value 'expected))))
((pair? (lset-difference eq? fields 'expected))
(error* "extraneous field initializers ~a"
(lset-difference eq? fields 'expected)))
(else
(error* "missing field initializers ~a"
(lset-difference eq? 'expected
fields)))))))))))))
(define (field-default-value s)
(syntax-case s (default)
((field (default val) _ ...)
(list #'field #'val))
((field _ options ...)
(field-default-value #'(field options ...)))
(_ #f)))
(define (thunked-field? s)
;; Return the field name if the field defined by S is thunked.
(syntax-case s (thunked)
((field (thunked) _ ...)
#'field)
((field _ options ...)
(thunked-field? #'(field options ...)))
(_ #f)))
(define (thunked-field-accessor-name field)
;; Return the name (an unhygienic syntax object) of the "real"
;; getter for field, which is assumed to be a thunked field.
(syntax-case field ()
((field get options ...)
(let* ((getter (syntax->datum #'get))
(real-getter (symbol-append '% getter '-real)))
(datum->syntax #'get real-getter)))))
(define (field-spec->srfi-9 field)
;; Convert a field spec of our style to a SRFI-9 field spec of the
;; form (field get).
(syntax-case field ()
((name get options ...)
#`(name
#,(if (thunked-field? field)
(thunked-field-accessor-name field)
#'get)))))
(define (thunked-field-accessor-definition field)
;; Return the real accessor for FIELD, which is assumed to be a
;; thunked field.
(syntax-case field ()
((name get _ ...)
(with-syntax ((real-get (thunked-field-accessor-name field)))
#'(define-inlinable (get x)
;; The real value of that field is a thunk, so call it.
((real-get x)))))))
(syntax-case s ()
((_ type syntactic-ctor ctor pred
(field get options ...) ...)
(let* ((field-spec #'((field get options ...) ...)))
(with-syntax (((field-spec* ...)
(map field-spec->srfi-9 field-spec))
((thunked-field-accessor ...)
(filter-map (lambda (field)
(and (thunked-field? field)
(thunked-field-accessor-definition
field)))
field-spec)))
#`(begin
(define-record-type type
(ctor field ...)
pred
field-spec* ...)
(begin thunked-field-accessor ...)
#,(make-syntactic-constructor #'type #'syntactic-ctor #'ctor
#'(field ...)
(filter-map thunked-field? field-spec)
(filter-map field-default-value
#'((field options ...)
...))))))))))
(define (alist->record alist make keys)
"Apply MAKE to the values associated with KEYS in ALIST."
(let ((args (map (cut assoc-ref alist <>) keys)))
(apply make args)))
(define (object->fields object fields port)
"Write OBJECT (typically a record) as a series of recutils-style fields to
PORT, according to FIELDS. FIELDS must be a list of field name/getter pairs."
(let loop ((fields fields))
(match fields
(()
object)
(((field . get) rest ...)
(format port "~a: ~a~%" field (get object))
(loop rest)))))
;;; records.scm ends here

17
guix/scripts/substitute-binary.scm
View file

@ -21,6 +21,7 @@ (define-module (guix scripts substitute-binary)
#:use-module (guix store)
#:use-module (guix utils)
#:use-module (guix config)
#:use-module (guix records)
#:use-module (guix nar)
#:use-module ((guix build utils) #:select (mkdir-p))
#:use-module (ice-9 rdelim)
@ -103,22 +104,6 @@ (define field-rx
(else
(error "unmatched line" line)))))
(define (alist->record alist make keys)
"Apply MAKE to the values associated with KEYS in ALIST."
(let ((args (map (cut assoc-ref alist <>) keys)))
(apply make args)))
(define (object->fields object fields port)
"Write OBJECT (typically a record) as a series of recutils-style fields to
PORT, according to FIELDS. FIELDS must be a list of field name/getter pairs."
(let loop ((fields fields))
(match fields
(()
object)
(((field . get) rest ...)
(format port "~a: ~a~%" field (get object))
(loop rest)))))
(define (fetch uri)
"Return a binary input port to URI and the number of bytes it's expected to
provide."

165
guix/utils.scm
View file

@ -42,7 +42,6 @@ (define-module (guix utils)
nixpkgs-derivation
nixpkgs-derivation*
define-record-type*
compile-time-value
memoize
default-keyword-arguments
@ -239,170 +238,6 @@ (define-syntax-rule (nixpkgs-derivation* attribute)
;;; Miscellaneous.
;;;
(define-syntax define-record-type*
(lambda (s)
"Define the given record type such that an additional \"syntactic
constructor\" is defined, which allows instances to be constructed with named
field initializers, à la SRFI-35, as well as default values."
(define (make-syntactic-constructor type name ctor fields thunked defaults)
"Make the syntactic constructor NAME for TYPE, that calls CTOR, and
expects all of FIELDS to be initialized. DEFAULTS is the list of
FIELD/DEFAULT-VALUE tuples, and THUNKED is the list of identifiers of
thunked fields."
(with-syntax ((type type)
(name name)
(ctor ctor)
(expected fields)
(defaults defaults))
#`(define-syntax name
(lambda (s)
(define (record-inheritance orig-record field+value)
;; Produce code that returns a record identical to
;; ORIG-RECORD, except that values for the FIELD+VALUE alist
;; prevail.
(define (field-inherited-value f)
(and=> (find (lambda (x)
(eq? f (car (syntax->datum x))))
field+value)
car))
#`(make-struct type 0
#,@(map (lambda (field index)
(or (field-inherited-value field)
#`(struct-ref #,orig-record
#,index)))
'expected
(iota (length 'expected)))))
(define (thunked-field? f)
(memq (syntax->datum f) '#,thunked))
(define (field-bindings field+value)
;; Return field to value bindings, for use in `letrec*' below.
(map (lambda (field+value)
(syntax-case field+value ()
((field value)
#`(field
#,(if (thunked-field? #'field)
#'(lambda () value)
#'value)))))
field+value))
(syntax-case s (inherit #,@fields)
((_ (inherit orig-record) (field value) (... ...))
#`(letrec* #,(field-bindings #'((field value) (... ...)))
#,(record-inheritance #'orig-record
#'((field value) (... ...)))))
((_ (field value) (... ...))
(let ((fields (map syntax->datum #'(field (... ...))))
(dflt (map (match-lambda
((f v)
(list (syntax->datum f) v)))
#'defaults)))
(define (field-value f)
(or (and=> (find (lambda (x)
(eq? f (car (syntax->datum x))))
#'((field value) (... ...)))
car)
(let ((value
(car (assoc-ref dflt
(syntax->datum f)))))
(if (thunked-field? f)
#`(lambda () #,value)
value))))
(let-syntax ((error*
(syntax-rules ()
((_ fmt args (... ...))
(syntax-violation 'name
(format #f fmt args
(... ...))
s)))))
(let ((fields (append fields (map car dflt))))
(cond ((lset= eq? fields 'expected)
#`(letrec* #,(field-bindings
#'((field value) (... ...)))
(ctor #,@(map field-value 'expected))))
((pair? (lset-difference eq? fields 'expected))
(error* "extraneous field initializers ~a"
(lset-difference eq? fields 'expected)))
(else
(error* "missing field initializers ~a"
(lset-difference eq? 'expected
fields)))))))))))))
(define (field-default-value s)
(syntax-case s (default)
((field (default val) _ ...)
(list #'field #'val))
((field _ options ...)
(field-default-value #'(field options ...)))
(_ #f)))
(define (thunked-field? s)
;; Return the field name if the field defined by S is thunked.
(syntax-case s (thunked)
((field (thunked) _ ...)
#'field)
((field _ options ...)
(thunked-field? #'(field options ...)))
(_ #f)))
(define (thunked-field-accessor-name field)
;; Return the name (an unhygienic syntax object) of the "real"
;; getter for field, which is assumed to be a thunked field.
(syntax-case field ()
((field get options ...)
(let* ((getter (syntax->datum #'get))
(real-getter (symbol-append '% getter '-real)))
(datum->syntax #'get real-getter)))))
(define (field-spec->srfi-9 field)
;; Convert a field spec of our style to a SRFI-9 field spec of the
;; form (field get).
(syntax-case field ()
((name get options ...)
#`(name
#,(if (thunked-field? field)
(thunked-field-accessor-name field)
#'get)))))
(define (thunked-field-accessor-definition field)
;; Return the real accessor for FIELD, which is assumed to be a
;; thunked field.
(syntax-case field ()
((name get _ ...)
(with-syntax ((real-get (thunked-field-accessor-name field)))
#'(define-inlinable (get x)
;; The real value of that field is a thunk, so call it.
((real-get x)))))))
(syntax-case s ()
((_ type syntactic-ctor ctor pred
(field get options ...) ...)
(let* ((field-spec #'((field get options ...) ...)))
(with-syntax (((field-spec* ...)
(map field-spec->srfi-9 field-spec))
((thunked-field-accessor ...)
(filter-map (lambda (field)
(and (thunked-field? field)
(thunked-field-accessor-definition
field)))
field-spec)))
#`(begin
(define-record-type type
(ctor field ...)
pred
field-spec* ...)
(begin thunked-field-accessor ...)
#,(make-syntactic-constructor #'type #'syntactic-ctor #'ctor
#'(field ...)
(filter-map thunked-field? field-spec)
(filter-map field-default-value
#'((field options ...)
...))))))))))
(define (memoize proc)
"Return a memoizing version of PROC."
(let ((cache (make-hash-table)))

137
tests/records.scm Normal file
View file

@ -0,0 +1,137 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (test-records)
#:use-module (srfi srfi-64)
#:use-module (ice-9 match)
#:use-module (guix records))
(test-begin "records")
(test-assert "define-record-type*"
(begin
(define-record-type* <foo> foo make-foo
foo?
(bar foo-bar)
(baz foo-baz (default (+ 40 2))))
(and (match (foo (bar 1) (baz 2))
(($ <foo> 1 2) #t))
(match (foo (baz 2) (bar 1))
(($ <foo> 1 2) #t))
(match (foo (bar 1))
(($ <foo> 1 42) #t)))))
(test-assert "define-record-type* with letrec* behavior"
;; Make sure field initializers can refer to each other as if they were in
;; a `letrec*'.
(begin
(define-record-type* <bar> bar make-bar
foo?
(x bar-x)
(y bar-y (default (+ 40 2)))
(z bar-z))
(and (match (bar (x 1) (y (+ x 1)) (z (* y 2)))
(($ <bar> 1 2 4) #t))
(match (bar (x 7) (z (* x 3)))
(($ <bar> 7 42 21)))
(match (bar (z 21) (x (/ z 3)))
(($ <bar> 7 42 21))))))
(test-assert "define-record-type* & inherit"
(begin
(define-record-type* <foo> foo make-foo
foo?
(bar foo-bar)
(baz foo-baz (default (+ 40 2))))
(let* ((a (foo (bar 1)))
(b (foo (inherit a) (baz 2)))
(c (foo (inherit b) (bar -2)))
(d (foo (inherit c)))
(e (foo (inherit (foo (bar 42))) (baz 77))))
(and (match a (($ <foo> 1 42) #t))
(match b (($ <foo> 1 2) #t))
(match c (($ <foo> -2 2) #t))
(equal? c d)
(match e (($ <foo> 42 77) #t))))))
(test-assert "define-record-type* & inherit & letrec* behavior"
(begin
(define-record-type* <foo> foo make-foo
foo?
(bar foo-bar)
(baz foo-baz (default (+ 40 2))))
(let* ((a (foo (bar 77)))
(b (foo (inherit a) (bar 1) (baz (+ bar 1))))
(c (foo (inherit b) (baz 2) (bar (- baz 1)))))
(and (match a (($ <foo> 77 42) #t))
(match b (($ <foo> 1 2) #t))
(equal? b c)))))
(test-assert "define-record-type* & thunked"
(begin
(define-record-type* <foo> foo make-foo
foo?
(bar foo-bar)
(baz foo-baz (thunked)))
(let* ((calls 0)
(x (foo (bar 2)
(baz (begin (set! calls (1+ calls)) 3)))))
(and (zero? calls)
(equal? (foo-bar x) 2)
(equal? (foo-baz x) 3) (= 1 calls)
(equal? (foo-baz x) 3) (= 2 calls)))))
(test-assert "define-record-type* & thunked & default"
(begin
(define-record-type* <foo> foo make-foo
foo?
(bar foo-bar)
(baz foo-baz (thunked) (default 42)))
(let ((mark (make-parameter #f)))
(let ((x (foo (bar 2) (baz (mark))))
(y (foo (bar 2))))
(and (equal? (foo-bar x) 2)
(parameterize ((mark (cons 'a 'b)))
(eq? (foo-baz x) (mark)))
(equal? (foo-bar y) 2)
(equal? (foo-baz y) 42))))))
(test-assert "define-record-type* & thunked & inherited"
(begin
(define-record-type* <foo> foo make-foo
foo?
(bar foo-bar (thunked))
(baz foo-baz (thunked) (default 42)))
(let ((mark (make-parameter #f)))
(let* ((x (foo (bar 2) (baz (mark))))
(y (foo (inherit x) (bar (mark)))))
(and (equal? (foo-bar x) 2)
(parameterize ((mark (cons 'a 'b)))
(eq? (foo-baz x) (mark)))
(parameterize ((mark (cons 'a 'b)))
(eq? (foo-bar y) (mark)))
(parameterize ((mark (cons 'a 'b)))
(eq? (foo-baz y) (mark))))))))
(test-end)
(exit (= (test-runner-fail-count (test-runner-current)) 0))

108
tests/utils.scm
View file

@ -126,114 +126,6 @@ (define-module (test-utils)
(append pids1 pids2)))
(equal? (get-bytevector-all decompressed) data)))))
(test-assert "define-record-type*"
(begin
(define-record-type* <foo> foo make-foo
foo?
(bar foo-bar)
(baz foo-baz (default (+ 40 2))))
(and (match (foo (bar 1) (baz 2))
(($ <foo> 1 2) #t))
(match (foo (baz 2) (bar 1))
(($ <foo> 1 2) #t))
(match (foo (bar 1))
(($ <foo> 1 42) #t)))))
(test-assert "define-record-type* with letrec* behavior"
;; Make sure field initializers can refer to each other as if they were in
;; a `letrec*'.
(begin
(define-record-type* <bar> bar make-bar
foo?
(x bar-x)
(y bar-y (default (+ 40 2)))
(z bar-z))
(and (match (bar (x 1) (y (+ x 1)) (z (* y 2)))
(($ <bar> 1 2 4) #t))
(match (bar (x 7) (z (* x 3)))
(($ <bar> 7 42 21)))
(match (bar (z 21) (x (/ z 3)))
(($ <bar> 7 42 21))))))
(test-assert "define-record-type* & inherit"
(begin
(define-record-type* <foo> foo make-foo
foo?
(bar foo-bar)
(baz foo-baz (default (+ 40 2))))
(let* ((a (foo (bar 1)))
(b (foo (inherit a) (baz 2)))
(c (foo (inherit b) (bar -2)))
(d (foo (inherit c)))
(e (foo (inherit (foo (bar 42))) (baz 77))))
(and (match a (($ <foo> 1 42) #t))
(match b (($ <foo> 1 2) #t))
(match c (($ <foo> -2 2) #t))
(equal? c d)
(match e (($ <foo> 42 77) #t))))))
(test-assert "define-record-type* & inherit & letrec* behavior"
(begin
(define-record-type* <foo> foo make-foo
foo?
(bar foo-bar)
(baz foo-baz (default (+ 40 2))))
(let* ((a (foo (bar 77)))
(b (foo (inherit a) (bar 1) (baz (+ bar 1))))
(c (foo (inherit b) (baz 2) (bar (- baz 1)))))
(and (match a (($ <foo> 77 42) #t))
(match b (($ <foo> 1 2) #t))
(equal? b c)))))
(test-assert "define-record-type* & thunked"
(begin
(define-record-type* <foo> foo make-foo
foo?
(bar foo-bar)
(baz foo-baz (thunked)))
(let* ((calls 0)
(x (foo (bar 2)
(baz (begin (set! calls (1+ calls)) 3)))))
(and (zero? calls)
(equal? (foo-bar x) 2)
(equal? (foo-baz x) 3) (= 1 calls)
(equal? (foo-baz x) 3) (= 2 calls)))))
(test-assert "define-record-type* & thunked & default"
(begin
(define-record-type* <foo> foo make-foo
foo?
(bar foo-bar)
(baz foo-baz (thunked) (default 42)))
(let ((mark (make-parameter #f)))
(let ((x (foo (bar 2) (baz (mark))))
(y (foo (bar 2))))
(and (equal? (foo-bar x) 2)
(parameterize ((mark (cons 'a 'b)))
(eq? (foo-baz x) (mark)))
(equal? (foo-bar y) 2)
(equal? (foo-baz y) 42))))))
(test-assert "define-record-type* & thunked & inherited"
(begin
(define-record-type* <foo> foo make-foo
foo?
(bar foo-bar (thunked))
(baz foo-baz (thunked) (default 42)))
(let ((mark (make-parameter #f)))
(let* ((x (foo (bar 2) (baz (mark))))
(y (foo (inherit x) (bar (mark)))))
(and (equal? (foo-bar x) 2)
(parameterize ((mark (cons 'a 'b)))
(eq? (foo-baz x) (mark)))
(parameterize ((mark (cons 'a 'b)))
(eq? (foo-bar y) (mark)))
(parameterize ((mark (cons 'a 'b)))
(eq? (foo-baz y) (mark))))))))
;; This is actually in (guix store).
(test-equal "store-path-package-name"
"bash-4.2-p24"