diff options
Diffstat (limited to 'guix/gexp.scm')
| -rw-r--r-- | guix/gexp.scm | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/guix/gexp.scm b/guix/gexp.scm index f005c4d296..8dea022e04 100644 --- a/guix/gexp.scm +++ b/guix/gexp.scm @@ -1,5 +1,6 @@ ;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org> +;;; Copyright © 2018 Clément Lassieur <clement@lassieur.org> ;;; ;;; This file is part of GNU Guix. ;;; @@ -86,6 +87,7 @@ define-gexp-compiler gexp-compiler? + file-like? lower-object lower-inputs @@ -182,6 +184,11 @@ procedure to lower it; otherwise return #f." (and=> (hashq-ref %gexp-compilers (struct-vtable object)) gexp-compiler-lower)) +(define (file-like? object) + "Return #t if OBJECT leads to a file in the store once unquoted in a +G-expression; otherwise return #f." + (and (struct? object) (->bool (lookup-compiler object)))) + (define (lookup-expander object) "Search for an expander for OBJECT. Upon success, return the three argument procedure to expand it; otherwise return #f." |