Support Foment

Foment had some peculiarities:

1. Parameterize objects are initialized with the objects themselves at
   some point, which broke the previous code.
2. Foment cannot discard multiple value returns in some scenarios.

1 files changed, 45 insertions, 0 deletions

diff --git a/lib/rewriters.foment.scm b/lib/rewriters.foment.scm
new file mode 100644
index 0000000..4d26429
--- /dev/null
+++ b/lib/rewriters.foment.scm
@@ -0,0 +1,45 @@
+#| Copyright © 2025 Peter McGoron
+ |
+ | Permission is hereby granted, free of charge, to any person obtaining
+ | a copy of this software and associated documentation files (the
+ | “Software”), to deal in the Software without restriction, including
+ | without limitation the rights to use, copy, modify, merge, publish,
+ | distribute, sublicense, and/or sell copies of the Software, and to
+ | permit persons to whom the Software is furnished to do so, subject to
+ | the following conditions:
+ |
+ | The above copyright notice and this permission notice shall be included
+ | in all copies or substantial portions of the Software.
+ |
+ | THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND,
+ | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+ | NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ | DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ | OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
+ | THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ |#
+
+(import (only (foment base)
+              error-object-type
+              error-object-who
+              error-object-kind))
+
+(begin
+  (define (default-on-pair pair)
+    (cons (test-rewrite (car pair))
+          (test-rewrite (cdr pair))))
+  (define (default-on-vector vec)
+    (vector-map test-rewrite vec))
+  (define (default-on-error error)
+    (let ((msg (error-object-message error))
+          (irritants (error-object-irritants error)))
+      `(error (type ,(test-rewrite (error-object-type error)))
+              (who ,(test-rewrite (error-object-who error)))
+              (kind ,(test-rewrite (error-object-kind error)))
+              (msg ,(test-rewrite (error-object-message error)))
+              (irritants ,@(map test-rewrite (error-object-irritants error))))))
+  (define default-rewriters
+    `((,pair? . ,default-on-pair)
+      (,vector? . ,default-on-vector)
+      (,error-object? . ,default-on-error))))
\ No newline at end of file