1 files changed, 49 insertions, 0 deletions
diff --git a/resources/libraries/bash/entry/check/line.sh b/resources/libraries/bash/entry/check/line.sh
new file mode 100644
index 0000000000..c58c7d0126
--- /dev/null
+++ b/resources/libraries/bash/entry/check/line.sh
@@ -0,0 +1,49 @@
+# Copyright (c) 2019 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -exuo pipefail
+
+# This file should be executed from tox, as the assumend working directory
+# is different from where this file is located.
+# This file does not have executable flag nor shebang,
+# to dissuade non-tox callers.
+
+# This script runs a grep-based command and fails if it detects any lines
+# longer than 80 characters.
+# The grep output stored to lines.log (overwriting).
+
+# "set -eu" handles failures from the following two lines.
+BASH_CHECKS_DIR="$(dirname $(readlink -e "${BASH_SOURCE[0]}"))"
+BASH_FUNCTION_DIR="$(readlink -e "${BASH_CHECKS_DIR}/../../function")"
+source "${BASH_FUNCTION_DIR}/common.sh" || {
+    echo "Source failed." >&2
+    exit 1
+}
+
+# docs contains too many wide formatted tables.
+# .txt contains lines with wide URLs.
+piped_command='set -exuo pipefail && grep -rn ".\{81\}" "resources/" "tests/"'
+piped_command+=' | fgrep -v .svg | fgrep -v .txt | tee "lines.log" | wc -l'
+lines="$(bash -c "${piped_command}")" || die
+if [ "${lines}" != "0" ]; then
+    # TODO: Decide which text goes to stdout and which to stderr.
+    warn "Long lines detected: ${lines}"
+    ## TODO: Enable when output size does more good than harm.
+    # cat "lines.log" >&2
+    warn
+    warn "Line length checker: FAIL"
+    exit 1
+fi
+
+warn
+warn "Line length checker: PASS"