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(define-module (tw gexp)
#:use-module (guix gexp)
#:use-module (guix modules))
;; See also: `file-join' in (gnu home services ssh).
(define-public (combined-text-file name . files)
"A file which is the concatenation of the contents of other files."
;; We need to use #$output for `computed-file' to work.
;; Of course this isn't documented anywhere!
(computed-file name
(with-imported-modules (source-module-closure
'((guix build utils))) ; for `dump-port'
#~(begin
(use-modules (guix build utils))
(call-with-output-file #$output
(lambda (oport)
(for-each (lambda (in-file)
(call-with-input-file in-file
(lambda (iport)
(dump-port iport oport))))
'#$files)))))))
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