1. Auto tag commit, based on npm-version 2. Auto calculate the build-version and insert it into package.json file

post-commit

#!/bin/bash

# ATTENTION: YOU NEED TO FIRST PUT `build-version: 0` FIELD IN YOUR "package.json" FILE!

version=$(grep -oP '\"version\":\s*\"\K\d+\.\d+\.\d+' package.json) # extract `version` from "package.json". ex: 2.0.4

git tag v$version 2>/dev/null # ex: `git tag v2.0.4` # Auto tag version if needed (if not already existed).

# Calculate `buildVersion`:

currentCommitNum=$(git rev-list --count HEAD 2>/dev/null || echo 0)

lastVersionCommitNum=$(git rev-list --count v$version 2>/dev/null || echo 0)

buildVersion=$(( currentCommitNum - lastVersionCommitNum ))

# Put the new calculated `buildVersion` in "package.json":
sed -i -E "s/(\"build-version\":\s*)\"?.*\"?,/\1$buildVersion,/" package.json # https://regex101.com/r/LqkQcD/1/

exit 0