git: Prevent WIP commits and use <root>/.last-test file with Makefile `test` target to make sure tests are passing

pre-push

#!/usr/bin/env bash

BASEDIR="$(cd "$(dirname "${BASH_SOURCE[0]}")"/../../ && pwd -P)"
# echo "basedir: $BASEDIR"

# REV_PARSE_HEAD="$(git rev-parse --short head)"

# remote="$1"
# url="$2"
# echo "remote:  $1"
# echo "url:     $2"

exit_code=0

# prevent WIP commits
z40=0000000000000000000000000000000000000000
IFS=' '
while read -r local_ref local_sha remote_ref remote_sha
do
    if [ "$local_sha" = $z40 ] ; then
        : # Handle delete
    else
        if [ "$remote_sha" = $z40 ] ; then
            # New branch, examine all commits
            range="$local_sha"
        else
            # Update to existing branch, examine new commits
            range="$remote_sha..$local_sha"
        fi

        # Check for WIP commit
        commit=$(git rev-list -n 1 --grep '^WIP' "$range")
        if [ -n "$commit" ] ; then
            echo "Found WIP commit in $local_ref, not pushing"
            ((exit_code++))
        fi
    fi
done

LAST_TEST_PATH="$BASEDIR/.last-test"
LAST_TEST_PATH_DISPLAY="${BASEDIR%/}"
LAST_TEST_PATH_DISPLAY="${LAST_TEST_PATH_DISPLAY##*/}/.last-test" # example: tsqlust/.last-test (given tsqlust is a git repo: tsqlust/.git/)

if [ -f "$LAST_TEST_PATH" ]; then
    # echo "Found $LAST_TEST_PATH_DISPLAY"
    LAST_TEST_CONTENTS="$(cat "$LAST_TEST_PATH")"
    LAST_TEST_CONTENTS_ARR=($LAST_TEST_CONTENTS)

    if [ -z "$LAST_TEST_CONTENTS" ]; then
        echo "$LAST_TEST_PATH_DISPLAY is empty, please run \`make test\`"
        ((exit_code++))
    elif [ "${LAST_TEST_CONTENTS[0]}" == "fail" ]; then
        FAILED_TEST_COMMIT=${LAST_TEST_CONTENTS_ARR[1]}
        echo "Tests failed for $FAILED_TEST_COMMIT, please fix this, run \`make test\`, then retry."
        ((exit_code++))
    #elif [ "${LAST_TEST_CONTENTS[0]}" != "$REV_PARSE_HEAD" ]; then
    #    LAST_TESTED_COMMIT=${LAST_TEST_CONTENTS_ARR[1]}

    #    if [ "$LAST_TESTED_COMMIT" != "$REV_PARSE_HEAD" ]; then
    #        echo "$LAST_TEST_PATH_DISPLAY is outdated, please run \`make test\`"
    #        ((exit_code++))
    #    else
    #        echo "Ehhhh... unexpected state:"
    #        echo "LAST_TESTED_COMMIT: $LAST_TESTED_COMMIT"
    #        echo "REV_PARSE_HEAD:     $REV_PARSE_HEAD"
    #        echo "LAST_TEST_CONTENTS: $LAST_TEST_CONTENTS"
    #        ((exit_code++))
    #    fi
    fi
elif [ -d "$LAST_TEST_PATH" ]; then
    echo "$LAST_TEST_PATH_DISPLAY is a directory, expected a file"
else
    : # Ok, last-test isn't used in this project
fi

exit $exit_code