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+;;; ccwl --- Concise Common Workflow Language
+;;; Copyright © 2021, 2022 Arun Isaac <arunisaac@systemreboot.net>
+;;;
+;;; This file is part of ccwl.
+;;;
+;;; ccwl is free software: you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation, either version 3 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; ccwl is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with ccwl.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This is a better test driver for Guile's (srfi srfi-64).
+;;
+;; TODO: Improve Guile's test driver so this module won't be
+;; necessary.
+
+;;; Code:
+
+(use-modules (ice-9 format)
+             (ice-9 match)
+             (srfi srfi-26)
+             (srfi srfi-64))
+
+(define (color code str color?)
+  (if color?
+      (format #f "~a[~am~a~a[0m" #\esc code str #\esc)
+      str))
+
+(define red (cut color 31 <> <>))
+(define green (cut color 32 <> <>))
+(define magenta (cut color 35 <> <>))
+
+(define (my-gnu-runner color?)
+  (let ((runner (test-runner-null)))
+    (test-runner-on-group-begin! runner
+      (lambda (runner suite-name count)
+        (format #t (magenta "%%%% ~a~%" color?) suite-name)))
+    (test-runner-on-group-end! runner
+      (lambda _
+        (newline)))
+    (test-runner-on-test-end! runner
+      (lambda (runner)
+        (let ((name (test-runner-test-name runner))
+              (result (string-upcase
+                       (symbol->string (test-result-kind runner))))
+              (result-alist (test-result-alist runner)))
+          (format #t "~a ~a~%"
+                  (case (test-result-kind runner)
+                    ((pass) (green result color?))
+                    (else (red result color?)))
+                  name)
+          ;; If test did not pass, print details.
+          (unless (eq? (test-result-kind runner) 'pass)
+            (format (current-error-port)
+                    "~a:~a~%expected: ~s~%actual: ~s~%"
+                    (assq-ref result-alist 'source-file)
+                    (assq-ref result-alist 'source-line)
+                    (match (assq-ref result-alist 'source-form)
+                      (('test-assert _ ...) #t)
+                      (_ (assq-ref result-alist 'expected-value)))
+                    (assq-ref result-alist 'actual-value))))))
+    runner))
+
+(match (command-line)
+  ((_ test-files ...)
+   (let ((runner (my-gnu-runner #t)))
+     (test-with-runner runner
+       (for-each load-from-path test-files)
+       (display (magenta "SUMMARY" #t))
+       (newline)
+       (format #t "PASS: ~a
+FAIL: ~a
+XPASS: ~a
+XFAIL: ~a
+SKIP: ~a
+"
+               (test-runner-pass-count runner)
+               (test-runner-fail-count runner)
+               (test-runner-xpass-count runner)
+               (test-runner-xfail-count runner)
+               (test-runner-skip-count runner))
+       (exit (zero? (test-runner-fail-count runner)))))))