Bash git version bump

buildver.sh

#!/bin/sh
# Prints the next version based on git tags in the pattern v0.0.0
# Uses regexp to infer which part of the version will be incremented
# Inspired by https://gitversion.net/docs/reference/version-increments

MAJOR_REGEXP="\+semver:\s?(breaking|major)"
MINOR_REGEXP="\+semver:\s?(feature|minor)"

COMMIT_TAG=$(git describe --exact-match --tags HEAD 2>/dev/null || true)

if [ -z $COMMIT_TAG ]; then
    COMMIT_MSG="$(git log -1 --pretty='%B')"

    if echo $COMMIT_MSG | grep -Eqi "$MAJOR_REGEXP"; then INCREMENT_PART=1; fi
    if echo $COMMIT_MSG | grep -Eqi "$MINOR_REGEXP"; then INCREMENT_PART=2; else INCREMENT_PART=3; fi

    LATEST_VERSION=$(git describe --tags --abbrev=0 --match "v*" $(git rev-list --tags --max-count=1))
    NEW_VERSION=$(echo $LATEST_VERSION | awk -F. -v OFS=. "{\$${INCREMENT_PART} += 1; print}")

    echo ${NEW_VERSION}
else
    echo ${COMMIT_TAG}
    exit 1
fi