1 files changed, 61 insertions, 0 deletions
diff --git a/share/txr/stdlib/package.tl b/share/txr/stdlib/package.tl
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+++ b/share/txr/stdlib/package.tl
@@ -0,0 +1,61 @@
+;; Copyright 2016
+;; Kaz Kylheku <kaz@kylheku.com>
+;; Vancouver, Canada
+;; All rights reserved.
+;;
+;; Redistribution and use in source and binary forms, with or without
+;; modification, are permitted provided that the following conditions are met:
+;;
+;; 1. Redistributions of source code must retain the above copyright notice, this
+;;    list of conditions and the following disclaimer.
+;;
+;; 2. Redistributions in binary form must reproduce the above copyright notice,
+;;    this list of conditions and the following disclaimer in the documentation
+;;    and/or other materials provided with the distribution.
+;;
+;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+;; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+;; DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+;; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+;; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+;; CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+;; OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+;; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+(macro-time
+  (defun sys:name-str (kind sym-or-string)
+    (cond
+      ((symbolp sym-or-string) (symbol-name sym-or-string))
+      ((stringp sym-or-string) sym-or-string)
+      (t (throw 'eval-error "~s: ~s isn't a valid ~a name"
+                'defpackage sym-or-string kind)))))
+
+(defmacro defpackage (name . clauses)
+  (let* ((pkg (gensym "pkg-"))
+         (name-str (sys:name-str 'package name))
+         (exp-clauses (append-each ((c clauses))
+                        (tree-case c
+                          ((keyword . rest)
+                            (caseql keyword
+                              (:use
+                                (if rest ^((use-package ',rest ,pkg))))
+                              (:use-syms
+                                ^((each ((s ',rest))
+                                    (use-sym s ,pkg))))
+                              (:local
+                                ^((each ((n ',(mapcar (op sys:name-str 'symbol)
+                                                      rest)))
+                                    (let ((s (intern n ,pkg)))
+                                      (unless (eq (symbol-package s) ,pkg)
+                                        (unuse-sym s ,pkg)
+                                        (intern n ,pkg))))))))
+                          (atom
+                            (throwf 'eval-error "~s: invalid clause: ~s"
+                                    'defpackage atom))))))
+    ^(let ((,pkg (or (find-package ,name-str)
+                     (make-package ,name-str))))
+       ,*(unless (assoc :use clauses) ^((use-package "usr" ,pkg)))
+       ,*exp-clauses
+       ,pkg)))