'make test': Colorize output.

Color is only added when "make test"'s stdout is a tty.

Makefile

@@ -26,7 +26,7 @@ test:
 			$(ZSH) -f tests/test-highlighting.zsh "$${test##*/}"; \
 			: $$(( result |= $$? )); \
 		fi \
-	done; \
+	done | $(ZSH) -f tests/tap-colorizer.zsh; \
 	exit $$result
 
 .PHONY: all install test

tests/tap-colorizer.zsh

@@ -0,0 +1,67 @@
+#!/usr/bin/env zsh
+# -------------------------------------------------------------------------------------------------
+# Copyright (c) 2015 zsh-syntax-highlighting contributors
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification, are permitted
+# provided that the following conditions are met:
+#
+#  * Redistributions of source code must retain the above copyright notice, this list of conditions
+#    and the following disclaimer.
+#  * Redistributions in binary form must reproduce the above copyright notice, this list of
+#    conditions and the following disclaimer in the documentation and/or other materials provided
+#    with the distribution.
+#  * Neither the name of the zsh-syntax-highlighting contributors nor the names of its contributors
+#    may be used to endorse or promote products derived from this software without specific prior
+#    written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+# FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# -------------------------------------------------------------------------------------------------
+# -*- mode: zsh; sh-indentation: 2; indent-tabs-mode: nil; sh-basic-offset: 2; -*-
+# vim: ft=zsh sw=2 ts=2 et
+# -------------------------------------------------------------------------------------------------
+
+# This is a stdin-to-stdout filter that takes TAP output (such as 'make test')
+# on stdin and passes it, colorized, to stdout.
+
+emulate -LR zsh
+
+if [[ ! -t 1 ]] ; then
+  exec cat
+fi
+
+while read -r line;
+do
+  case $line in
+    # comment (filename header) or plan
+    (#* | <->..<->)
+      print -nP %F{blue}
+      ;;
+    # XPASS
+    (ok*# TODO*)
+      print -nP %F{red}
+      ;;
+    # XFAIL
+    (not ok*# TODO*)
+      print -nP %F{yellow}
+      ;;
+    # FAIL
+    (not ok*)
+      print -nP %F{red}
+      ;;
+    # PASS
+    (ok*)
+      print -nP %F{green}
+      ;;
+  esac
+  print -nr - "$line"
+  print -nP %f
+  echo "" # newline
+done