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(define-module (taler-helpers)
#:use-module (guix)
#:use-module (guix utils)
#:use-module (ice-9 textual-ports)
#:export (concat-local-files))
;;;
;;; Helpers
;;;
(define (absolute-file-name file directory)
"Return the canonical absolute file name for FILE, which lives in the
vicinity of DIRECTORY."
(canonicalize-path
(cond ((string-prefix? "/" file) file)
((not directory) file)
((string-prefix? "/" directory)
(string-append directory "/" file))
(else file))))
(define (%%concat-local-files srcdir outname files)
(define (slurp f)
(call-with-input-file (absolute-file-name f srcdir) get-string-all))
(define (file-concat files)
(string-concatenate (map slurp files)))
(plain-file outname (file-concat files)))
(define-syntax concat-local-files
(lambda (s)
(syntax-case s ()
((_ outname files)
#'(%%concat-local-files (current-source-directory) outname files))
((_)
#'(syntax-error "missing arguments"))
(id
(identifier? #'id)
#'(syntax-error
"'concat-local-files' is a macro and cannot be used like this")))))
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