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| author | Ludovic Courtès <ludo@gnu.org> | 2014-04-30 23:16:03 +0200 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2014-04-30 23:16:23 +0200 |
| commit | 7560b00b1c9f24ceff7a9295ac3453594b14242d (patch) | |
| tree | 3ab5bfec7d310218b4ba43d7bc44ae482cd243cd /guix/gexp.scm | |
| parent | e1485c7b3846dabc6f9ea2d55bf5766657d0b19b (diff) | |
gexp: Add pretty printer.
* guix/gexp.scm (write-gexp): New procedure.
<top level>: Add call to 'set-record-type-printer!'.
Diffstat (limited to 'guix/gexp.scm')
| -rw-r--r-- | guix/gexp.scm | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/guix/gexp.scm b/guix/gexp.scm index a52360cd11..79b6ec7085 100644 --- a/guix/gexp.scm +++ b/guix/gexp.scm @@ -26,6 +26,7 @@ #:use-module (guix packages) #:use-module (srfi srfi-1) #:use-module (srfi srfi-9) + #:use-module (srfi srfi-9 gnu) #:use-module (srfi srfi-26) #:use-module (ice-9 match) #:export (gexp @@ -56,6 +57,15 @@ (references gexp-references) ; ((DRV-OR-PKG OUTPUT) ...) (proc gexp-proc)) ; procedure +(define (write-gexp gexp port) + "Write GEXP on PORT." + (display "#<gexp " port) + (write (apply (gexp-proc gexp) (gexp-references gexp)) port) + (format port " ~a>" + (number->string (object-address gexp) 16))) + +(set-record-type-printer! <gexp> write-gexp) + ;; Reference to one of the derivation's outputs, for gexps used in ;; derivations. (define-record-type <output-ref> |