From f82c58539e1f7b9b864e68ea2ab0c6a17c15fbb5 Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Mon, 6 Jun 2016 18:12:31 +0200
Subject: bournish: Allow compilation of multiple expressions.

* guix/build/bournish.scm (%bournish-language): Add a joiner to SCHEME.
Compile only to Scheme.
* tests/bournish.scm: New file.
* Makefile.am (SCM_TESTS): Add it.
---
 guix/build/bournish.scm | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

(limited to 'guix')

diff --git a/guix/build/bournish.scm b/guix/build/bournish.scm
index 3bea1c80c2..1f17e0a22d 100644
--- a/guix/build/bournish.scm
+++ b/guix/build/bournish.scm
@@ -149,11 +149,24 @@ (define (read-bournish port env)
 
 (define %bournish-language
   (let ((scheme (lookup-language 'scheme)))
+    ;; XXX: The 'scheme' language lacks a "joiner", so we add one here.  This
+    ;; allows us to have 'read-bournish' read one shell statement at a time
+    ;; instead of having to read until EOF.
+    (set! (language-joiner scheme)
+      (lambda (exps env)
+        (match exps
+          (()   '(begin))
+          ((exp) exp)
+          (_    `(begin ,@exps)))))
+
     (make-language #:name 'bournish
                    #:title "Bournish"
+
+                   ;; The reader does all the heavy lifting.
                    #:reader read-bournish
-                   #:compilers (language-compilers scheme)
-                   #:decompilers (language-decompilers scheme)
+                   #:compilers `((scheme . ,(lambda (exp env options)
+                                              (values exp env env))))
+                   #:decompilers '()
                    #:evaluator (language-evaluator scheme)
                    #:printer (language-printer scheme)
                    #:make-default-environment
-- 
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