From 712f3adf74644116bfe5e439cf1d44e608641c72 Mon Sep 17 00:00:00 2001
From: Sergey Motornyuk <sergey.motornyuk@linkdigital.com.au>
Date: Fri, 14 Dec 2018 15:03:28 +0200
Subject: [PATCH] Script that removes old git branches

---
 bin/remove-old-git-branches.sh | 61 ++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100755 bin/remove-old-git-branches.sh

diff --git a/bin/remove-old-git-branches.sh b/bin/remove-old-git-branches.sh
new file mode 100755
index 00000000000..940757cca07
--- /dev/null
+++ b/bin/remove-old-git-branches.sh
@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+
+# Change this variable if you are using another name for ckan/ckan's remote
+REMOTE=origin
+PR_ENDPOINT=https://api.github.com/repos/ckan/ckan/pulls
+
+prepare_branches() {
+  echo List existing branches
+  # awk filters out `master`, `release-something`, `dev-something` and `MAJOR.MINOR-something` branches
+  custom_branches=$(git fetch $REMOTE && git branch -r --list $REMOTE/* | awk '{ if ($2 !~ /^[0-9]\.[0-9]|^release|^dev-|^master$|HEAD/) print $2}' FS=/)
+
+  echo Calculate total amount of active PRs
+  # github adds Link header, that contains reference to last page with results. And that helps us to define total number of pages
+  last_page=$(curl -s -I $PR_ENDPOINT | grep '^Link' | sed -E 's/.*page=([[:digit:]]+).*rel="last".*/\1/')
+
+  echo Compute branches that are in use by active PRs
+  for ((i=1; i<=$last_page; i++))
+  do
+    # Take JSON, get name of branch with feature, leave only those ones, that starts with `ckan:`. I think, that jq is much more nice way to process json, but i'm not sure, that every one has it. But if you do,
+    # you can replace python's section with something like `| jq '.[] | .head.label' -r |`
+    next_portion=$(curl -s "$PR_ENDPOINT?page=$i" | python -c 'import json, sys; raw=sys.stdin.read(); labels=[str(item["head"]["label"]) for item in json.loads(raw)]; print("\n".join(labels))' | grep '^ckan' | sed 's/^ckan://')
+    used_branches="$used_branches\n$next_portion"
+    echo [$i of $last_page parts processed]
+  done;
+
+  echo Compute list of branches that can be safetely removed
+  tmp_file=$(mktemp)
+  diff <(echo -e "$used_branches" | sort) <(echo -e "$custom_branches" | sort) --unchanged-line-format="" >> $tmp_file
+
+  echo
+  echo List of all branches that can be removed stored into $tmp_file. Review it\'s content and run \'$0 --apply $tmp_file\'.
+  echo NOTE. This command requires write access to CKAN repository and will actually remove all branches that are listed in $tmp_file.
+}
+
+if [[ $# -gt 0 ]];
+then
+  case "$1" in
+    -h|--help)
+      echo Compute/remove unused branches
+      echo Usage: $0 [--apply FILE_WITH_BRANCHES]
+      ;;
+    --apply)
+      shift
+      if [[ -f $1 ]]
+      then
+        while read branch
+        do
+          git push $REMOTE --delete $branch
+        done < $1
+      else
+        echo File does not exist
+      fi
+      shift
+      ;;
+    *)
+      echo Check usage with: $0 --help
+      ;;
+  esac
+else
+  prepare_branches
+fi