diff --git a/ansi.scm b/ansi.scm
new file mode 100644
index 0000000..04fe68a
--- /dev/null
+++ b/ansi.scm
@@ -0,0 +1,70 @@
+;;
+;; ansi.scm
+;;
+;; ANSI terminal support.
+;;
+;; ISC License
+;;
+;; Copyright 2023 Brmlab, z.s.
+;; Dominik Pantůček <dominik.pantucek@trustica.cz>
+;;
+;; Permission to use, copy, modify, and/or distribute this software
+;; for any purpose with or without fee is hereby granted, provided
+;; that the above copyright notice and this permission notice appear
+;; in all copies.
+;; 
+;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+;;
+
+(module
+ ansi
+ (
+  ansi
+  ansi-tests!
+  )
+
+ (import scheme
+	 (chicken base)
+	 testing)
+
+ ;; Only basic ANSI colors and bold attribute support.
+ (define colors
+   '((#:black . 30)
+     (#:red . 31)
+     (#:green . 32)
+     (#:yellow . 33)
+     (#:blue . 34)
+     (#:magenta . 35)
+     (#:cyan . 36)
+     (#:white . 37)
+     (#:default . 0)
+     (#:bold . 1)))
+
+ ;; Returns a list with elements matching pred? predicate.
+ (define (filter pred? lst)
+   (let loop ((lst lst)
+	      (res '()))
+     (if (null? lst)
+	 (reverse res)
+	 (if (pred? (car lst))
+	     (loop (cdr lst)
+		   (cons (car lst) res))
+	     (loop (cdr lst)
+		   res)))))
+
+ (define (ansi . args)
+   "")
+
+ (define (ansi-tests!)
+   (run-tests
+    ansi
+    ))
+
+ )
diff --git a/brmsaptool.scm b/brmsaptool.scm
index aeab131..d5f4b2b 100644
--- a/brmsaptool.scm
+++ b/brmsaptool.scm
@@ -29,7 +29,8 @@
 	month
 	period
 	member-file
-	command-line)
+	command-line
+	ansi)
 
 ;; Print banner
 (print "brmsaptool 0.2 (c) 2023 Brmlab, z.s.")
@@ -42,6 +43,7 @@
 (period-tests!)
 (member-file-tests!)
 (command-line-tests!)
+(ansi-tests!)
 (newline)
 
 (command-line