records: Add `recutils->alist' for public consumption.

* guix/records.scm (%recutils-field-rx): New variable.
  (recutils->alist): New procedure, formerly known as `fields->alist'.
* guix/scripts/substitute-binary.scm (fields->alist): Use it.
* tests/records.scm ("recutils->alist"): New test.

1 files changed, 2 insertions, 17 deletions

diff --git a/guix/scripts/substitute-binary.scm b/guix/scripts/substitute-binary.scm
index 24e5d68c4f..fb2eb4dbe8 100755
--- a/guix/scripts/substitute-binary.scm
+++ b/guix/scripts/substitute-binary.scm
@@ -102,23 +102,8 @@ output port, and PROC's result is returned."
 (define (fields->alist port)
   "Read recutils-style record from PORT and return them as a list of key/value
 pairs."
-  (define field-rx
-    (make-regexp "^([[:graph:]]+): (.*)$"))
-
-  (let loop ((line   (read-line port))
-             (result '()))
-    (cond ((eof-object? line)
-           (reverse result))
-          ((with-mutex %regexp-exec-mutex
-             (regexp-exec field-rx line))
-           =>
-           (lambda (match)
-             (loop (read-line port)
-                   (alist-cons (match:substring match 1)
-                               (match:substring match 2)
-                               result))))
-          (else
-           (error "unmatched line" line)))))
+  (with-mutex %regexp-exec-mutex
+    (recutils->alist port)))
 
 (define %fetch-timeout
   ;; Number of seconds after which networking is considered "slow".