Fix portability issues in test runner script

Makefile

@@ -45,7 +45,7 @@ src/html_blocks.c: html_block_names.gperf
 # Testing
 
 test: hoedown
-	test/runner.bash ./hoedown test/MarkdownTest_1.0.3/Tests
+	test/runner.sh ./hoedown test/MarkdownTest_1.0.3/Tests
 
 test-pl: hoedown
 	perl test/MarkdownTest_1.0.3/MarkdownTest.pl \

test/runner.bash

@@ -1,34 +0,0 @@
-#!/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"

test/runner.sh

@@ -0,0 +1,40 @@
+#!/bin/sh
+
+POSIXLY_CORRECT=1
+export POSIXLY_CORRECT
+
+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 "$SCRIPT"   || abort "argument #1 invalid; not executable"
+echo "" | "$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 "$TEXT" .text) ... "
+    HTML=$(echo "$TEXT" | sed 's/\.text$/.html/')
+    mkfifo .pipe
+    $SCRIPT "$TEXT" | $TIDY > .pipe &
+    DIFF=$($TIDY "$HTML" | diff .pipe -)
+    if test "$?" = 0; then
+        PASSED=$(expr $PASSED + 1)
+        echo OK
+    else
+        FAILED=$(expr $FAILED + 1)
+        echo FAILED
+        printf "\n$DIFF\n\n"
+    fi
+    rm .pipe
+done
+
+printf "\n\n$PASSED passed; $FAILED failed.\n"