A simple change detector to monitor a git repo at a folder level to see what has changed between commits. This can then be fed into a build pipeline to selectively build, test and deploy just the affected components.
The basic building block is the git diff command, for example:
## Full change details
git diff 50a6eea 8857709 -- repo/componentA
### Just the stats
git diff --stat 50a6eea 8857709 -- repo/componentA
### Nothing changed for componentB between these commits
git diff --stat 50a6eea 8857709 -- repo/componentB