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1 files changed, 38 insertions, 0 deletions

diff --git a/guix/taler-helpers.scm b/guix/taler-helpers.scm
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+(define-module taler-helpers
+  #:use-module (guix)
+  #:use-module (guix utils)
+  #: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 rest ...)
+       #'(%%concat-local-files (current-source-directory) outname rest ...))
+      ((_)
+       #'(syntax-error "missing arguments"))
+      (id
+       (identifier? #'id)
+       #'(syntax-error
+          "'concat-local-files' is a macro and cannot be used like this")))))