runtests.sh: use plain Bourne shell

Ensure that the script can be used on any POSIX system.

Author: tarleb

Makefile

@@ -5,7 +5,7 @@ LUA_FILTERS_TEST_IMAGE = tarleb/lua-filters-test
 .PHONY: test show-args docker-test docker-test-image archive
 
 test:
-	bash runtests.sh $(FILTERS)
+	sh runtests.sh $(FILTERS)
 
 archive: .build/lua-filters.tar.gz
 

runtests.sh

@@ -1,29 +1,23 @@
-#!/bin/bash
+#!/bin/sh
 # argument is list of filters
-
 FILTERS=$*
 
-ERRORS_COUNT=0
-PASSED_COUNT=0
-SKIPPED_COUNT=0
-EXPECTED_COUNT=0
-
-let err=0
+errors_count=0
+passed_count=0
 
 for d in $FILTERS; do
-  let "EXPECTED_COUNT++"
   make --no-print-directory -C $d test
   if [ $? -eq 0 ]; then
-    let "PASSED_COUNT++"
-    echo "✓ $d"
+    passed_count=$(($passed_count + 1))
+    printf "✓ $d\n"
   else
-    let "ERRORS_COUNT++"
-    echo "✗ $d"
+    errors_count=$(($errors_count + 1))
+    printf "✗ $d\n"
   fi
 done
 
-echo ""
-echo "⚖ Summary"
-echo "✓ ${PASSED_COUNT} passed"
-[ ${ERRORS_COUNT} = 0 ] || echo "✗ ${ERRORS_COUNT} errors"
-exit ${ERRORS_COUNT}
+printf "\n"
+printf "⚖ Summary\n"
+printf "✓ ${passed_count} passed\n"
+[ ${errors_count} = 0 ] || printf "✗ ${errors_count} errors\n"
+exit ${errors_count}