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diff --git a/scheme/racket/geiser/completions.rkt b/scheme/racket/geiser/completions.rkt
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+;;; completions.rkt -- completion support
+
+;; Copyright (C) 2009, 2010 Jose Antonio Ortega Ruiz
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the Modified BSD License. You should
+;; have received a copy of the license along with this program. If
+;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
+
+;; Start date: Sun Apr 26, 2009 19:02
+
+#lang racket
+
+(provide symbol-completions
+         module-completions)
+
+(require srfi/13 geiser/utils geiser/modules)
+
+(define (filter-prefix prefix lst sort?)
+  (filter (lambda (s) (string-prefix? prefix s))
+          (if sort? (sort lst string<?) lst)))
+
+(define (symbol-completions prefix)
+  (filter-prefix prefix
+                 (map symbol->string (namespace-mapped-symbols))
+                 #t))
+
+(define (module-completions prefix)
+  (filter-prefix prefix (module-list) #f))
+
+;;; completions.rkt ends here