Add Bash test runner

Makefile

@@ -14,7 +14,7 @@ HOEDOWN_SRC=\
 	src/markdown.o \
 	src/stack.o
 
-.PHONY:		all test clean
+.PHONY:		all test test-pl clean
 
 all:		libhoedown.so hoedown smartypants
 
@@ -45,6 +45,9 @@ src/html_blocks.c: html_block_names.gperf
 # Testing
 
 test: hoedown
+	test/runner.bash ./hoedown test/MarkdownTest_1.0.3/Tests
+
+test-pl: hoedown
 	perl test/MarkdownTest_1.0.3/MarkdownTest.pl \
 		--script=./hoedown --testdir=test/MarkdownTest_1.0.3/Tests --tidy
 

test/runner.bash

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+TIDY='tidy --show-body-only 1 --quiet 1 --show-warnings 0'
+SCRIPT="$1"
+TESTDIR="$2"
+PASSED=0
+FAILED=0
+
+abort() {
+    echo "Error: $*"
+    exit 1
+}
+
+test -f "$SCRIPT"  || abort "argument #1 invalid; not a file"
+test -x "$SCRIPT"  || abort "argument #1 invalid; not executable"
+"$SCRIPT" <<< ""   || abort "argument #1 invalid; script failed to run"
+test -d "$TESTDIR" || abort "argument #2 invalid; not a directory"
+
+for TEXT in "$TESTDIR"/*.text; do
+    test -f "$TEXT" || abort "empty or invalid test directory"
+    printf "$(basename "$TEXT" .text) ... "
+    HTML="${TEXT/%.text/.html}"
+    DIFF=`diff <($SCRIPT "$TEXT" | $TIDY) <($TIDY "$HTML")`
+    if test $? == 0; then
+        ((PASSED++))
+        echo OK
+    else
+        ((FAILED++))
+        echo FAILED
+        printf "\n$DIFF\n\n"
+    fi
+done
+
+printf "\n\n$PASSED passed; $FAILED failed.\n"