750 lines
27 KiB
Scheme
750 lines
27 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
||
;;; Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
|
||
;;; Copyright © 2013, 2014, 2015 Mark H Weaver <mhw@netris.org>
|
||
;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
|
||
;;; Copyright © 2014 Ian Denhardt <ian@zenhack.net>
|
||
;;;
|
||
;;; 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 utils)
|
||
#:use-module (guix config)
|
||
#:use-module (srfi srfi-1)
|
||
#:use-module (srfi srfi-9)
|
||
#:use-module (srfi srfi-11)
|
||
#:use-module (srfi srfi-26)
|
||
#:use-module (srfi srfi-39)
|
||
#:use-module (srfi srfi-60)
|
||
#:use-module (rnrs bytevectors)
|
||
#:use-module ((rnrs io ports) #:select (put-bytevector))
|
||
#:use-module ((guix build utils)
|
||
#:select (dump-port package-name->name+version))
|
||
#:use-module ((guix build syscalls) #:select (errno mkdtemp!))
|
||
#:use-module (ice-9 vlist)
|
||
#:use-module (ice-9 format)
|
||
#:autoload (ice-9 popen) (open-pipe*)
|
||
#:autoload (ice-9 rdelim) (read-line)
|
||
#:use-module (ice-9 regex)
|
||
#:use-module (ice-9 match)
|
||
#:use-module (ice-9 format)
|
||
#:use-module (system foreign)
|
||
#:re-export (package-name->name+version)
|
||
#:export (bytevector->base16-string
|
||
base16-string->bytevector
|
||
|
||
%nixpkgs-directory
|
||
nixpkgs-derivation
|
||
nixpkgs-derivation*
|
||
|
||
compile-time-value
|
||
fcntl-flock
|
||
memoize
|
||
strip-keyword-arguments
|
||
default-keyword-arguments
|
||
substitute-keyword-arguments
|
||
|
||
<location>
|
||
location
|
||
location?
|
||
location-file
|
||
location-line
|
||
location-column
|
||
source-properties->location
|
||
|
||
nix-system->gnu-triplet
|
||
gnu-triplet->nix-system
|
||
%current-system
|
||
%current-target-system
|
||
version-compare
|
||
version>?
|
||
version>=?
|
||
version-prefix
|
||
version-major+minor
|
||
guile-version>?
|
||
string-replace-substring
|
||
arguments-from-environment-variable
|
||
file-extension
|
||
file-sans-extension
|
||
call-with-temporary-output-file
|
||
call-with-temporary-directory
|
||
with-atomic-file-output
|
||
fold2
|
||
fold-tree
|
||
fold-tree-leaves
|
||
|
||
filtered-port
|
||
compressed-port
|
||
decompressed-port
|
||
call-with-decompressed-port
|
||
compressed-output-port
|
||
call-with-compressed-output-port))
|
||
|
||
|
||
;;;
|
||
;;; Compile-time computations.
|
||
;;;
|
||
|
||
(define-syntax compile-time-value
|
||
(syntax-rules ()
|
||
"Evaluate the given expression at compile time. The expression must
|
||
evaluate to a simple datum."
|
||
((_ exp)
|
||
(let-syntax ((v (lambda (s)
|
||
(let ((val exp))
|
||
(syntax-case s ()
|
||
(_ #`'#,(datum->syntax s val)))))))
|
||
v))))
|
||
|
||
|
||
;;;
|
||
;;; Base 16.
|
||
;;;
|
||
|
||
(define (bytevector->base16-string bv)
|
||
"Return the hexadecimal representation of BV's contents."
|
||
(define len
|
||
(bytevector-length bv))
|
||
|
||
(let-syntax ((base16-chars (lambda (s)
|
||
(syntax-case s ()
|
||
(_
|
||
(let ((v (list->vector
|
||
(unfold (cut > <> 255)
|
||
(lambda (n)
|
||
(format #f "~2,'0x" n))
|
||
1+
|
||
0))))
|
||
v))))))
|
||
(define chars base16-chars)
|
||
(let loop ((i len)
|
||
(r '()))
|
||
(if (zero? i)
|
||
(string-concatenate r)
|
||
(let ((i (- i 1)))
|
||
(loop i
|
||
(cons (vector-ref chars (bytevector-u8-ref bv i)) r)))))))
|
||
|
||
(define base16-string->bytevector
|
||
(let ((chars->value (fold (lambda (i r)
|
||
(vhash-consv (string-ref (number->string i 16)
|
||
0)
|
||
i r))
|
||
vlist-null
|
||
(iota 16))))
|
||
(lambda (s)
|
||
"Return the bytevector whose hexadecimal representation is string S."
|
||
(define bv
|
||
(make-bytevector (quotient (string-length s) 2) 0))
|
||
|
||
(string-fold (lambda (chr i)
|
||
(let ((j (quotient i 2))
|
||
(v (and=> (vhash-assv chr chars->value) cdr)))
|
||
(if v
|
||
(if (zero? (logand i 1))
|
||
(bytevector-u8-set! bv j
|
||
(arithmetic-shift v 4))
|
||
(let ((w (bytevector-u8-ref bv j)))
|
||
(bytevector-u8-set! bv j (logior v w))))
|
||
(error "invalid hexadecimal character" chr)))
|
||
(+ i 1))
|
||
0
|
||
s)
|
||
bv)))
|
||
|
||
|
||
|
||
;;;
|
||
;;; Filtering & pipes.
|
||
;;;
|
||
|
||
(define (filtered-port command input)
|
||
"Return an input port where data drained from INPUT is filtered through
|
||
COMMAND (a list). In addition, return a list of PIDs that the caller must
|
||
wait. When INPUT is a file port, it must be unbuffered; otherwise, any
|
||
buffered data is lost."
|
||
(let loop ((input input)
|
||
(pids '()))
|
||
(if (file-port? input)
|
||
(match (pipe)
|
||
((in . out)
|
||
(match (primitive-fork)
|
||
(0
|
||
(dynamic-wind
|
||
(const #f)
|
||
(lambda ()
|
||
(close-port in)
|
||
(close-port (current-input-port))
|
||
(dup2 (fileno input) 0)
|
||
(close-port (current-output-port))
|
||
(dup2 (fileno out) 1)
|
||
(catch 'system-error
|
||
(lambda ()
|
||
(apply execl (car command) command))
|
||
(lambda args
|
||
(format (current-error-port)
|
||
"filtered-port: failed to execute '~{~a ~}': ~a~%"
|
||
command (strerror (system-error-errno args))))))
|
||
(lambda ()
|
||
(primitive-_exit 1))))
|
||
(child
|
||
(close-port out)
|
||
(values in (cons child pids))))))
|
||
|
||
;; INPUT is not a file port, so fork just for the sake of tunneling it
|
||
;; through a file port.
|
||
(match (pipe)
|
||
((in . out)
|
||
(match (primitive-fork)
|
||
(0
|
||
(dynamic-wind
|
||
(const #t)
|
||
(lambda ()
|
||
(close-port in)
|
||
(dump-port input out))
|
||
(lambda ()
|
||
(false-if-exception (close out))
|
||
(primitive-_exit 0))))
|
||
(child
|
||
(close-port out)
|
||
(loop in (cons child pids)))))))))
|
||
|
||
(define (decompressed-port compression input)
|
||
"Return an input port where INPUT is decompressed according to COMPRESSION,
|
||
a symbol such as 'xz."
|
||
(match compression
|
||
((or #f 'none) (values input '()))
|
||
('bzip2 (filtered-port `(,%bzip2 "-dc") input))
|
||
('xz (filtered-port `(,%xz "-dc") input))
|
||
('gzip (filtered-port `(,%gzip "-dc") input))
|
||
(else (error "unsupported compression scheme" compression))))
|
||
|
||
(define (compressed-port compression input)
|
||
"Return an input port where INPUT is decompressed according to COMPRESSION,
|
||
a symbol such as 'xz."
|
||
(match compression
|
||
((or #f 'none) (values input '()))
|
||
('bzip2 (filtered-port `(,%bzip2 "-c") input))
|
||
('xz (filtered-port `(,%xz "-c") input))
|
||
('gzip (filtered-port `(,%gzip "-c") input))
|
||
(else (error "unsupported compression scheme" compression))))
|
||
|
||
(define (call-with-decompressed-port compression port proc)
|
||
"Call PROC with a wrapper around PORT, a file port, that decompresses data
|
||
read from PORT according to COMPRESSION, a symbol such as 'xz."
|
||
(let-values (((decompressed pids)
|
||
(decompressed-port compression port)))
|
||
(dynamic-wind
|
||
(const #f)
|
||
(lambda ()
|
||
(proc decompressed))
|
||
(lambda ()
|
||
(close-port decompressed)
|
||
(unless (every (compose zero? cdr waitpid) pids)
|
||
(error "decompressed-port failure" pids))))))
|
||
|
||
(define (filtered-output-port command output)
|
||
"Return an output port. Data written to that port is filtered through
|
||
COMMAND and written to OUTPUT, an output file port. In addition, return a
|
||
list of PIDs to wait for. OUTPUT must be unbuffered; otherwise, any buffered
|
||
data is lost."
|
||
(match (pipe)
|
||
((in . out)
|
||
(match (primitive-fork)
|
||
(0
|
||
(dynamic-wind
|
||
(const #f)
|
||
(lambda ()
|
||
(close-port out)
|
||
(close-port (current-input-port))
|
||
(dup2 (fileno in) 0)
|
||
(close-port (current-output-port))
|
||
(dup2 (fileno output) 1)
|
||
(catch 'system-error
|
||
(lambda ()
|
||
(apply execl (car command) command))
|
||
(lambda args
|
||
(format (current-error-port)
|
||
"filtered-output-port: failed to execute '~{~a ~}': ~a~%"
|
||
command (strerror (system-error-errno args))))))
|
||
(lambda ()
|
||
(primitive-_exit 1))))
|
||
(child
|
||
(close-port in)
|
||
(values out (list child)))))))
|
||
|
||
(define (compressed-output-port compression output)
|
||
"Return an output port whose input is compressed according to COMPRESSION,
|
||
a symbol such as 'xz, and then written to OUTPUT. In addition return a list
|
||
of PIDs to wait for."
|
||
(match compression
|
||
((or #f 'none) (values output '()))
|
||
('bzip2 (filtered-output-port `(,%bzip2 "-c") output))
|
||
('xz (filtered-output-port `(,%xz "-c") output))
|
||
('gzip (filtered-output-port `(,%gzip "-c") output))
|
||
(else (error "unsupported compression scheme" compression))))
|
||
|
||
(define (call-with-compressed-output-port compression port proc)
|
||
"Call PROC with a wrapper around PORT, a file port, that compresses data
|
||
that goes to PORT according to COMPRESSION, a symbol such as 'xz."
|
||
(let-values (((compressed pids)
|
||
(compressed-output-port compression port)))
|
||
(dynamic-wind
|
||
(const #f)
|
||
(lambda ()
|
||
(proc compressed))
|
||
(lambda ()
|
||
(close-port compressed)
|
||
(unless (every (compose zero? cdr waitpid) pids)
|
||
(error "compressed-output-port failure" pids))))))
|
||
|
||
|
||
;;;
|
||
;;; Nixpkgs.
|
||
;;;
|
||
|
||
(define %nixpkgs-directory
|
||
(make-parameter
|
||
;; Capture the build-time value of $NIXPKGS.
|
||
(or %nixpkgs
|
||
(and=> (getenv "NIXPKGS")
|
||
(lambda (val)
|
||
;; Bail out when passed an empty string, otherwise
|
||
;; `nix-instantiate' will sit there and attempt to read
|
||
;; from its standard input.
|
||
(if (string=? val "")
|
||
#f
|
||
val))))))
|
||
|
||
(define* (nixpkgs-derivation attribute #:optional (system (%current-system)))
|
||
"Return the derivation path of ATTRIBUTE in Nixpkgs."
|
||
(let* ((p (open-pipe* OPEN_READ (or (getenv "NIX_INSTANTIATE")
|
||
%nix-instantiate)
|
||
"-A" attribute (%nixpkgs-directory)
|
||
"--argstr" "system" system))
|
||
(l (read-line p))
|
||
(s (close-pipe p)))
|
||
(and (zero? (status:exit-val s))
|
||
(not (eof-object? l))
|
||
l)))
|
||
|
||
(define-syntax-rule (nixpkgs-derivation* attribute)
|
||
"Evaluate the given Nixpkgs derivation at compile-time."
|
||
(compile-time-value (nixpkgs-derivation attribute)))
|
||
|
||
|
||
;;;
|
||
;;; Advisory file locking.
|
||
;;;
|
||
|
||
(define %struct-flock
|
||
;; 'struct flock' from <fcntl.h>.
|
||
(list short ; l_type
|
||
short ; l_whence
|
||
size_t ; l_start
|
||
size_t ; l_len
|
||
int)) ; l_pid
|
||
|
||
(define F_SETLKW
|
||
;; On Linux-based systems, this is usually 7, but not always
|
||
;; (exceptions include SPARC.) On GNU/Hurd, it's 9.
|
||
(compile-time-value
|
||
(cond ((string-contains %host-type "sparc") 9) ; sparc-*-linux-gnu
|
||
((string-contains %host-type "linux") 7) ; *-linux-gnu
|
||
(else 9)))) ; *-gnu*
|
||
|
||
(define F_SETLK
|
||
;; Likewise: GNU/Hurd and SPARC use 8, while the others typically use 6.
|
||
(compile-time-value
|
||
(cond ((string-contains %host-type "sparc") 8) ; sparc-*-linux-gnu
|
||
((string-contains %host-type "linux") 6) ; *-linux-gnu
|
||
(else 8)))) ; *-gnu*
|
||
|
||
(define F_xxLCK
|
||
;; The F_RDLCK, F_WRLCK, and F_UNLCK constants.
|
||
(compile-time-value
|
||
(cond ((string-contains %host-type "sparc") #(1 2 3)) ; sparc-*-linux-gnu
|
||
((string-contains %host-type "hppa") #(1 2 3)) ; hppa-*-linux-gnu
|
||
((string-contains %host-type "linux") #(0 1 2)) ; *-linux-gnu
|
||
(else #(1 2 3))))) ; *-gnu*
|
||
|
||
(define fcntl-flock
|
||
(let* ((ptr (dynamic-func "fcntl" (dynamic-link)))
|
||
(proc (pointer->procedure int ptr `(,int ,int *))))
|
||
(lambda* (fd-or-port operation #:key (wait? #t))
|
||
"Perform locking OPERATION on the file beneath FD-OR-PORT. OPERATION
|
||
must be a symbol, one of 'read-lock, 'write-lock, or 'unlock. When WAIT? is
|
||
true, block until the lock is acquired; otherwise, thrown an 'flock-error'
|
||
exception if it's already taken."
|
||
(define (operation->int op)
|
||
(case op
|
||
((read-lock) (vector-ref F_xxLCK 0))
|
||
((write-lock) (vector-ref F_xxLCK 1))
|
||
((unlock) (vector-ref F_xxLCK 2))
|
||
(else (error "invalid fcntl-flock operation" op))))
|
||
|
||
(define fd
|
||
(if (port? fd-or-port)
|
||
(fileno fd-or-port)
|
||
fd-or-port))
|
||
|
||
;; XXX: 'fcntl' is a vararg function, but here we happily use the
|
||
;; standard ABI; crossing fingers.
|
||
(let ((err (proc fd
|
||
(if wait?
|
||
F_SETLKW ; lock & wait
|
||
F_SETLK) ; non-blocking attempt
|
||
(make-c-struct %struct-flock
|
||
(list (operation->int operation)
|
||
SEEK_SET
|
||
0 0 ; whole file
|
||
0)))))
|
||
(or (zero? err)
|
||
|
||
;; Presumably we got EAGAIN or so.
|
||
(throw 'flock-error (errno)))))))
|
||
|
||
|
||
;;;
|
||
;;; Miscellaneous.
|
||
;;;
|
||
|
||
(define (memoize proc)
|
||
"Return a memoizing version of PROC."
|
||
(let ((cache (make-hash-table)))
|
||
(lambda args
|
||
(let ((results (hash-ref cache args)))
|
||
(if results
|
||
(apply values results)
|
||
(let ((results (call-with-values (lambda ()
|
||
(apply proc args))
|
||
list)))
|
||
(hash-set! cache args results)
|
||
(apply values results)))))))
|
||
|
||
(define (strip-keyword-arguments keywords args)
|
||
"Remove all of the keyword arguments listed in KEYWORDS from ARGS."
|
||
(let loop ((args args)
|
||
(result '()))
|
||
(match args
|
||
(()
|
||
(reverse result))
|
||
(((? keyword? kw) arg . rest)
|
||
(loop rest
|
||
(if (memq kw keywords)
|
||
result
|
||
(cons* arg kw result))))
|
||
((head . tail)
|
||
(loop tail (cons head result))))))
|
||
|
||
(define (default-keyword-arguments args defaults)
|
||
"Return ARGS augmented with any keyword/value from DEFAULTS for
|
||
keywords not already present in ARGS."
|
||
(let loop ((defaults defaults)
|
||
(args args))
|
||
(match defaults
|
||
((kw value rest ...)
|
||
(loop rest
|
||
(if (assoc-ref kw args)
|
||
args
|
||
(cons* kw value args))))
|
||
(()
|
||
args))))
|
||
|
||
(define-syntax substitute-keyword-arguments
|
||
(syntax-rules ()
|
||
"Return a new list of arguments where the value for keyword arg KW is
|
||
replaced by EXP. EXP is evaluated in a context where VAR is boud to the
|
||
previous value of the keyword argument."
|
||
((_ original-args ((kw var) exp) ...)
|
||
(let loop ((args original-args)
|
||
(before '()))
|
||
(match args
|
||
((kw var rest (... ...))
|
||
(loop rest (cons* exp kw before)))
|
||
...
|
||
((x rest (... ...))
|
||
(loop rest (cons x before)))
|
||
(()
|
||
(reverse before)))))))
|
||
|
||
(define* (nix-system->gnu-triplet
|
||
#:optional (system (%current-system)) (vendor "unknown"))
|
||
"Return a guess of the GNU triplet corresponding to Nix system
|
||
identifier SYSTEM."
|
||
(match system
|
||
("armhf-linux"
|
||
(string-append "arm-" vendor "-linux-gnueabihf"))
|
||
(_
|
||
(let* ((dash (string-index system #\-))
|
||
(arch (substring system 0 dash))
|
||
(os (substring system (+ 1 dash))))
|
||
(string-append arch
|
||
"-" vendor "-"
|
||
(if (string=? os "linux")
|
||
"linux-gnu"
|
||
os))))))
|
||
|
||
(define (gnu-triplet->nix-system triplet)
|
||
"Return the Nix system type corresponding to TRIPLET, a GNU triplet as
|
||
returned by `config.guess'."
|
||
(let ((triplet (cond ((string-match "^i[345]86-(.*)$" triplet)
|
||
=>
|
||
(lambda (m)
|
||
(string-append "i686-" (match:substring m 1))))
|
||
(else triplet))))
|
||
(cond ((string-match "^arm[^-]*-([^-]+-)?linux-gnueabihf" triplet)
|
||
"armhf-linux")
|
||
((string-match "^([^-]+)-([^-]+-)?linux-gnu.*" triplet)
|
||
=>
|
||
(lambda (m)
|
||
;; Nix omits `-gnu' for GNU/Linux.
|
||
(string-append (match:substring m 1) "-linux")))
|
||
((string-match "^([^-]+)-([^-]+-)?([[:alpha:]]+)([0-9]+\\.?)*$" triplet)
|
||
=>
|
||
(lambda (m)
|
||
;; Nix strip the version number from names such as `gnu0.3',
|
||
;; `darwin10.2.0', etc., and always strips the vendor part.
|
||
(string-append (match:substring m 1) "-"
|
||
(match:substring m 3))))
|
||
(else triplet))))
|
||
|
||
(define %current-system
|
||
;; System type as expected by Nix, usually ARCHITECTURE-KERNEL.
|
||
;; By default, this is equal to (gnu-triplet->nix-system %host-type).
|
||
(make-parameter %system))
|
||
|
||
(define %current-target-system
|
||
;; Either #f or a GNU triplet representing the target system we are
|
||
;; cross-building to.
|
||
(make-parameter #f))
|
||
|
||
(define version-compare
|
||
(let ((strverscmp
|
||
(let ((sym (or (dynamic-func "strverscmp" (dynamic-link))
|
||
(error "could not find `strverscmp' (from GNU libc)"))))
|
||
(pointer->procedure int sym (list '* '*)))))
|
||
(lambda (a b)
|
||
"Return '> when A denotes a newer version than B,
|
||
'< when A denotes a older version than B,
|
||
or '= when they denote equal versions."
|
||
(let ((result (strverscmp (string->pointer a) (string->pointer b))))
|
||
(cond ((positive? result) '>)
|
||
((negative? result) '<)
|
||
(else '=))))))
|
||
|
||
(define (version-prefix version-string num-parts)
|
||
"Truncate version-string to the first num-parts components of the version.
|
||
For example, (version-prefix \"2.1.47.4.23\" 3) returns \"2.1.47\""
|
||
(string-join (take (string-split version-string #\.) num-parts) "."))
|
||
|
||
|
||
(define (version-major+minor version-string)
|
||
"Return \"<major>.<minor>\", where major and minor are the major and
|
||
minor version numbers from version-string."
|
||
(version-prefix version-string 2))
|
||
|
||
(define (version>? a b)
|
||
"Return #t when A denotes a version strictly newer than B."
|
||
(eq? '> (version-compare a b)))
|
||
|
||
(define (version>=? a b)
|
||
"Return #t when A denotes a version newer or equal to B."
|
||
(case (version-compare a b)
|
||
((> =) #t)
|
||
(else #f)))
|
||
|
||
(define (guile-version>? str)
|
||
"Return #t if the running Guile version is greater than STR."
|
||
;; Note: Using (version>? (version) "2.0.5") or similar doesn't work,
|
||
;; because the result of (version) can have a prefix, like "2.0.5-deb1".
|
||
(version>? (string-append (major-version) "."
|
||
(minor-version) "."
|
||
(micro-version))
|
||
str))
|
||
|
||
(define (file-extension file)
|
||
"Return the extension of FILE or #f if there is none."
|
||
(let ((dot (string-rindex file #\.)))
|
||
(and dot (substring file (+ 1 dot) (string-length file)))))
|
||
|
||
(define (file-sans-extension file)
|
||
"Return the substring of FILE without its extension, if any."
|
||
(let ((dot (string-rindex file #\.)))
|
||
(if dot
|
||
(substring file 0 dot)
|
||
file)))
|
||
|
||
(define* (string-replace-substring str substr replacement
|
||
#:optional
|
||
(start 0)
|
||
(end (string-length str)))
|
||
"Replace all occurrences of SUBSTR in the START--END range of STR by
|
||
REPLACEMENT."
|
||
(match (string-length substr)
|
||
(0
|
||
(error "string-replace-substring: empty substring"))
|
||
(substr-length
|
||
(let loop ((start start)
|
||
(pieces (list (substring str 0 start))))
|
||
(match (string-contains str substr start end)
|
||
(#f
|
||
(string-concatenate-reverse
|
||
(cons (substring str start) pieces)))
|
||
(index
|
||
(loop (+ index substr-length)
|
||
(cons* replacement
|
||
(substring str start index)
|
||
pieces))))))))
|
||
|
||
(define (arguments-from-environment-variable variable)
|
||
"Retrieve value of environment variable denoted by string VARIABLE in the
|
||
form of a list of strings (`char-set:graphic' tokens) suitable for consumption
|
||
by `args-fold', if VARIABLE is defined, otherwise return an empty list."
|
||
(let ((env (getenv variable)))
|
||
(if env
|
||
(string-tokenize env char-set:graphic)
|
||
'())))
|
||
|
||
(define (call-with-temporary-output-file proc)
|
||
"Call PROC with a name of a temporary file and open output port to that
|
||
file; close the file and delete it when leaving the dynamic extent of this
|
||
call."
|
||
(let* ((directory (or (getenv "TMPDIR") "/tmp"))
|
||
(template (string-append directory "/guix-file.XXXXXX"))
|
||
(out (mkstemp! template)))
|
||
(dynamic-wind
|
||
(lambda ()
|
||
#t)
|
||
(lambda ()
|
||
(proc template out))
|
||
(lambda ()
|
||
(false-if-exception (close out))
|
||
(false-if-exception (delete-file template))))))
|
||
|
||
(define (call-with-temporary-directory proc)
|
||
"Call PROC with a name of a temporary directory; close the directory and
|
||
delete it when leaving the dynamic extent of this call."
|
||
(let* ((directory (or (getenv "TMPDIR") "/tmp"))
|
||
(template (string-append directory "/guix-directory.XXXXXX"))
|
||
(tmp-dir (mkdtemp! template)))
|
||
(dynamic-wind
|
||
(const #t)
|
||
(lambda ()
|
||
(proc tmp-dir))
|
||
(lambda ()
|
||
(false-if-exception (rmdir tmp-dir))))))
|
||
|
||
(define (with-atomic-file-output file proc)
|
||
"Call PROC with an output port for the file that is going to replace FILE.
|
||
Upon success, FILE is atomically replaced by what has been written to the
|
||
output port, and PROC's result is returned."
|
||
(let* ((template (string-append file ".XXXXXX"))
|
||
(out (mkstemp! template)))
|
||
(with-throw-handler #t
|
||
(lambda ()
|
||
(let ((result (proc out)))
|
||
(close out)
|
||
(rename-file template file)
|
||
result))
|
||
(lambda (key . args)
|
||
(false-if-exception (delete-file template))))))
|
||
|
||
(define fold2
|
||
(case-lambda
|
||
((proc seed1 seed2 lst)
|
||
"Like `fold', but with a single list and two seeds."
|
||
(let loop ((result1 seed1)
|
||
(result2 seed2)
|
||
(lst lst))
|
||
(if (null? lst)
|
||
(values result1 result2)
|
||
(call-with-values
|
||
(lambda () (proc (car lst) result1 result2))
|
||
(lambda (result1 result2)
|
||
(loop result1 result2 (cdr lst)))))))
|
||
((proc seed1 seed2 lst1 lst2)
|
||
"Like `fold', but with a two lists and two seeds."
|
||
(let loop ((result1 seed1)
|
||
(result2 seed2)
|
||
(lst1 lst1)
|
||
(lst2 lst2))
|
||
(if (or (null? lst1) (null? lst2))
|
||
(values result1 result2)
|
||
(call-with-values
|
||
(lambda () (proc (car lst1) (car lst2) result1 result2))
|
||
(lambda (result1 result2)
|
||
(fold2 proc result1 result2 (cdr lst1) (cdr lst2)))))))))
|
||
|
||
(define (fold-tree proc init children roots)
|
||
"Call (PROC NODE RESULT) for each node in the tree that is reachable from
|
||
ROOTS, using INIT as the initial value of RESULT. The order in which nodes
|
||
are traversed is not specified, however, each node is visited only once, based
|
||
on an eq? check. Children of a node to be visited are generated by
|
||
calling (CHILDREN NODE), the result of which should be a list of nodes that
|
||
are connected to NODE in the tree, or '() or #f if NODE is a leaf node."
|
||
(let loop ((result init)
|
||
(seen vlist-null)
|
||
(lst roots))
|
||
(match lst
|
||
(() result)
|
||
((head . tail)
|
||
(if (not (vhash-assq head seen))
|
||
(loop (proc head result)
|
||
(vhash-consq head #t seen)
|
||
(match (children head)
|
||
((or () #f) tail)
|
||
(children (append tail children))))
|
||
(loop result seen tail))))))
|
||
|
||
(define (fold-tree-leaves proc init children roots)
|
||
"Like fold-tree, but call (PROC NODE RESULT) only for leaf nodes."
|
||
(fold-tree
|
||
(lambda (node result)
|
||
(match (children node)
|
||
((or () #f) (proc node result))
|
||
(else result)))
|
||
init children roots))
|
||
|
||
|
||
;;;
|
||
;;; Source location.
|
||
;;;
|
||
|
||
;; A source location.
|
||
(define-record-type <location>
|
||
(make-location file line column)
|
||
location?
|
||
(file location-file) ; file name
|
||
(line location-line) ; 1-indexed line
|
||
(column location-column)) ; 0-indexed column
|
||
|
||
(define location
|
||
(memoize
|
||
(lambda (file line column)
|
||
"Return the <location> object for the given FILE, LINE, and COLUMN."
|
||
(and line column file
|
||
(make-location file line column)))))
|
||
|
||
(define (source-properties->location loc)
|
||
"Return a location object based on the info in LOC, an alist as returned
|
||
by Guile's `source-properties', `frame-source', `current-source-location',
|
||
etc."
|
||
(let ((file (assq-ref loc 'filename))
|
||
(line (assq-ref loc 'line))
|
||
(col (assq-ref loc 'column)))
|
||
;; In accordance with the GCS, start line and column numbers at 1. Note
|
||
;; that unlike LINE and `port-column', COL is actually 1-indexed here...
|
||
(location file (and line (+ line 1)) col)))
|