#!/usr/bin/env 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