X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/sod/blobdiff_plain/9a3cb4610ab59001fd44c13dcdc6ea206acf0e50..a351d620c0162c2230f257f93f60beecfd7d05c2:/src/module-impl.lisp

diff --git a/src/module-impl.lisp b/src/module-impl.lisp
index 1eb2531..fc068d3 100644
--- a/src/module-impl.lisp
+++ b/src/module-impl.lisp
@@ -25,6 +25,56 @@
 
 (cl:in-package #:sod)
 
+;; Establish a standard environment within the body of a module.  This is an
+;; attempt -- but not a wholly successful one -- to present the same
+;; environment to a module independent of the context in which we imported
+;; it.
+
+;;;--------------------------------------------------------------------------
+;;; Module variables.
+
+(eval-when (:load-toplevel :execute)
+  (macrolet ((fix (var &optional (value var))
+	       (once-only (value)
+		 `(add-module-binding ',var (lambda () ,value)))))
+
+    ;; Use `sod-user' package by default.  This seems the most useful.  Alas,
+    ;; some tenants might not keep it as tidy as we'd like, but there are
+    ;; probably useful ways to side-effect the package too.
+    (fix *package* (find-package "SOD-USER"))
+
+    ;; Stream bindings.  Hope that the values we find at load time are
+    ;; sufficiently sensible.
+    (fix *debug-io*)
+    (fix *error-output*)
+    (fix *query-io*)
+    (fix *standard-input*)
+    (fix *standard-output*)
+    (fix *terminal-io*)
+    (fix *trace-output*)
+
+    ;; Print state.
+    (fix *print-array* t)
+    (fix *print-base* 10)
+    (fix *print-case* :upcase)
+    (fix *print-circle* nil)
+    (fix *print-escape* t)
+    (fix *print-gensym* t)
+    (fix *print-length* nil)
+    (fix *print-level* nil)
+    (fix *print-lines* nil)
+    (fix *print-miser-width*)
+    (fix *print-pretty* t)
+    (fix *print-radix* nil)
+    (fix *print-readably* nil)
+    (fix *print-right-margin*)
+
+    ;; Read state.
+    (fix *read-base* 10)
+    (fix *read-eval* t)
+    (fix *read-suppress* nil)
+    (fix *readtable* (copy-readtable nil))))
+
 ;;;--------------------------------------------------------------------------
 ;;; Module basics.