Colorize test output.

This adds a dependency on awk for testing.

Closes #812

Makefile

@@ -90,7 +90,9 @@ dunstify: dunstify.o
 
 .PHONY: test test-valgrind test-coverage
 test: test/test clean-coverage-run
-	./test/test -v
+	# Make sure an error code is returned when the test fails
+	/usr/bin/env bash -c 'set -euo pipefail;\
+	./test/test -v | ./test/greenest.awk '
 
 test-valgrind: test/test
 	${VALGRIND} \

test/greenest.awk

@@ -0,0 +1,33 @@
+#!/usr/bin/awk -f
+# Copyright (c) 2016 Scott Vokes <vokes.s@gmail.com>
+#
+# 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.
+
+BEGIN {
+    GREEN = "\033[32m"
+    RED = "\033[31m"
+    YELLOW = "\033[33m"
+    RESET = "\033[m"
+}
+
+/^PASS/ { sub("PASS", GREEN "PASS" RESET) }
+/^SKIP/ { sub("SKIP", YELLOW "SKIP" RESET) }
+/^FAIL/ { sub("FAIL", RED "FAIL" RESET) }
+
+# highlight hexdump difference markers
+/^[0-9a-f]/ {
+    sub("X", GREEN "X" RESET, $2)
+    gsub("<", GREEN "<" RESET, $0)
+}
+
+{ print($0) }