Add test case to match headers

test.sh

@@ -14,6 +14,7 @@ diff <(tail -n +$start AUTHORS | sort) <(tail -n +$start AUTHORS)
 ./test/test-gofmt.sh
 ./test/test-yamlfmt.sh
 ./test/test-bashfmt.sh
+./test/test-headerfmt.sh
 go test
 echo running go vet	# since it doesn't output an ok message on pass
 go vet && echo PASS

test/test-headerfmt.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+# check that headers are properly formatted
+echo running test-headerfmt.sh
+ROOT="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"	# dir!
+FILE="${ROOT}/main.go"	# file headers should match main.go
+COUNT=0
+while IFS='' read -r line; do	# find what header should look like
+	echo "$line" | grep -q '^//' || break
+	COUNT=`expr $COUNT + 1`
+done < "$FILE"
+cd "${ROOT}"
+
+find_files() {
+	git ls-files | grep '\.go$'
+}
+
+bad_files=$(
+	for i in $(find_files); do
+		if ! diff -q <( head -n $COUNT "$i" ) <( head -n $COUNT "$FILE" ) &>/dev/null; then
+			echo "$i"
+		fi
+	done
+)
+
+if [[ -n "${bad_files}" ]]; then
+	echo 'FAIL'
+	echo 'The following file headers are not properly formatted:'
+	echo "${bad_files}"
+	exit 1
+fi