diff options
Diffstat (limited to 'guix/gexp.scm')
| -rw-r--r-- | guix/gexp.scm | 33 |
1 files changed, 18 insertions, 15 deletions
diff --git a/guix/gexp.scm b/guix/gexp.scm index 80d8f735b3..d9c4cb461e 100644 --- a/guix/gexp.scm +++ b/guix/gexp.scm @@ -459,21 +459,24 @@ whether this should be considered a \"native\" input or not." (set-record-type-printer! <gexp-output> write-gexp-output) (define (gexp-modules gexp) - "Return the list of Guile module names GEXP relies on." - (delete-duplicates - (append (gexp-self-modules gexp) - (append-map (match-lambda - (($ <gexp-input> (? gexp? exp)) - (gexp-modules exp)) - (($ <gexp-input> (lst ...)) - (append-map (lambda (item) - (if (gexp? item) - (gexp-modules item) - '())) - lst)) - (_ - '())) - (gexp-references gexp))))) + "Return the list of Guile module names GEXP relies on. If (gexp? GEXP) is +false, meaning that GEXP is a plain Scheme object, return the empty list." + (if (gexp? gexp) + (delete-duplicates + (append (gexp-self-modules gexp) + (append-map (match-lambda + (($ <gexp-input> (? gexp? exp)) + (gexp-modules exp)) + (($ <gexp-input> (lst ...)) + (append-map (lambda (item) + (if (gexp? item) + (gexp-modules item) + '())) + lst)) + (_ + '())) + (gexp-references gexp)))) + '())) ;plain Scheme data type (define* (lower-inputs inputs #:key system target) |