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diff --git a/src/geiser/completion.scm b/src/geiser/completion.scm
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+;;; completion.scm -- completing known symbols and module names
+
+;; Copyright (C) 2009, 2012 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: Mon Mar 02, 2009 02:22
+
+(define-module (geiser completion)
+  #:export (completions module-completions)
+  #:use-module (geiser utils)
+  #:use-module (geiser modules)
+  #:use-module (ice-9 session)
+  #:use-module (ice-9 regex))
+
+(define (completions prefix)
+  (let ((prefix (string-append "^" (regexp-quote prefix))))
+    (sort! (map symbol->string (apropos-internal prefix)) string<?)))
+
+(define (module-completions prefix)
+  (let* ((prefix (string-append "^" (regexp-quote prefix)))
+         (matcher (lambda (s) (string-match prefix s)))
+         (names (filter matcher (all-modules))))
+    (sort! names string<?)))