zulip/tools/commit-message-lint

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#!/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 Travis CI.
# 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
commits=$(git log "$range" | wc -l)
if [ "$commits" -gt 0 ]; then
# Only run gitlint with non-empty commit lists, to avoid a printed
# warning.
gitlint --commits "$range"
fi