zulip/tools/commit-message-lint

#!/bin/bash

# Lint all commit messages that are newer than upstream/master if running
# locally or the commits in the push or PR if in TravisCI.

# The rules can be found in /.gitlint

if [ "$TRAVIS" ]; then
    # Work around https://github.com/travis-ci/travis-ci/issues/4596
    range="${TRAVIS_COMMIT_RANGE/.../..}"
else
    range="upstream/master..HEAD"
fi

gitlint --commits $range