Trim Old Branches #466

	name: Trim Old Branches

	on:
	push:
	branches:
	- trim**
	repository_dispatch:
	types:
	- all
	- trim
	schedule:
	- cron: "0 0 * * *" # every day at midnight

	jobs:
	trim_branches:
	runs-on: ubuntu-latest

	name: Trim Old Branches

	steps:
	- uses: actions/checkout@v3
	name: GitHub Pull

	# https://github.com/actions/checkout/pull/112/files#diff-04c6e90faac2675aa89e2176d2eec7d8R194-R200
	- name: Fetch all branches
	run: \|
	git fetch --no-tags --prune --depth=1 origin +refs/heads/:refs/remotes/origin/

	- name: Trim Branches
	shell: bash
	# delete branches starting with `gha-`
	# do not delete the most recent 5 branches
	# delete all branches whose latest commit is older than a week.
	run: \|
	git config --local --unset http.https://github.com/.extraheader
	git config --local --list
	echo ""
	echo "All Branches:"
	git branch -r --sort=-committerdate
	echo ""
	echo "Branches older than most recent 5 branches"
	git branch -r --sort=-committerdate \| awk -F/ '/\/gha-/{print $2}' \| tail -n+6
	echo ""
	for k in $(git branch -r --sort=-committerdate \| awk -F/ '/\/gha-/{print $2}' \| tail -n+6); do
	echo "Branch: $k"
	if [ -z "$(git log -1 --since='1 week ago' -s origin/$k)" ]; then
	echo "-- Deleting branch: $k"
	git push https://${{ github.actor }}:${{ secrets.GITHUB_TOKEN }}@github.com/rstudio/shinycoreci.git --delete $k
	fi
	done

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