#!/usr/bin/env bash

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

# The rules can be found in /.gitlint

repository="zulip/zulip"

if [[ "
$(git remote -v)
" =~ '
'([^[:space:]]*)[[:space:]]*(https://github\.com/|ssh://git@github\.com/|git@github\.com:)"$repository"(\.git|/)?\ \(fetch\)'
' ]]; then
    remote=${BASH_REMATCH[1]}
else
    remote=upstream
fi

upstream_commits=$(git rev-parse "refs/remotes/$remote/main" --glob="refs/remotes/$remote/*.x")
mapfile -t upstream_commits <<<"$upstream_commits"
base=$(git merge-base HEAD "${upstream_commits[@]}")

commits=$(git rev-list --count "$base..HEAD")
if [ "$commits" -gt 0 ]; then
    # Only run gitlint with non-empty commit lists, to avoid a printed
    # warning.
    gitlint --commits "$base..HEAD"
fi