Add a simple bashfmt test

If someone ever made a bashfmt script, that would be a lovely hack!

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
 go test
 echo running go vet	# since it doesn't output an ok message on pass
 go vet && echo PASS

test/test-bashfmt.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+# check for any bash files that aren't properly formatted
+# TODO: this is hardly exhaustive
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+ROOT=$(dirname "${BASH_SOURCE}")/..
+
+cd "${ROOT}"
+
+find_files() {
+	git ls-files | grep -e '\.sh$' -e '\.bash$'
+}
+
+bad_files=$(
+	for i in $(find_files); do
+		# search for more than one leading space, to ensure we use tabs
+		if grep -q '^  ' "$i"; then
+			echo "$i"
+		fi
+	done
+)
+
+if [[ -n "${bad_files}" ]]; then
+	echo 'FAIL'
+	echo 'The following bash files are not properly formatted:'
+	echo "${bad_files}"
+	exit 1
+fi