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utils: Add #:options parameter for compression output ports.

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* guix/utils.scm (compressed-output-port,
  call-with-compressed-output-port): Add #:options parameter and honor
  it.
This commit is contained in:
Ludovic Courtès 2015-09-25 22:34:16 +02:00
parent 1f321f8763
commit 62d2b57157
1 changed files with 13 additions and 8 deletions
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21
guix/utils.scm
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@ -283,22 +283,27 @@ (define (filtered-output-port command output)
(close-port in)
(values out (list child)))))))
(define (compressed-output-port compression output)
(define* (compressed-output-port compression output
#:key (options '()))
"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."
of PIDs to wait for. OPTIONS is a list of strings passed to the compression
program--e.g., '(\"--fast\")."
(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))
('bzip2 (filtered-output-port `(,%bzip2 "-c" ,@options) output))
('xz (filtered-output-port `(,%xz "-c" ,@options) output))
('gzip (filtered-output-port `(,%gzip "-c" ,@options) output))
(else (error "unsupported compression scheme" compression))))
(define (call-with-compressed-output-port compression port proc)
(define* (call-with-compressed-output-port compression port proc
#:key (options '()))
"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."
that goes to PORT according to COMPRESSION, a symbol such as 'xz. OPTIONS is
a list of command-line arguments passed to the compression program."
(let-values (((compressed pids)
(compressed-output-port compression port)))
(compressed-output-port compression port
#:options options)))
(dynamic-wind
(const #f)
(lambda ()