Deletes all merged git branches older than the provided date.

BranchDeleter.sh

#!/bin/sh

cd ../..

date=$1 #Format: 2015-01-15
root_branch=$2 #Format: origin/branchName e.g. origin/release/1_6
DRY_RUN=$3

numberDeleted=0

FilterOut() {
  for branchToKeep in "HEAD" "develop" "master"; do
    if [ "$1" == "$branchToKeep" ]; then
      return 1
    fi
  done

  return 0
}

DeleteBranch() {
  echo "Deleting branch $1"
  if [ "$DRY_RUN" -eq 0 ]; then
    git push origin ":$1"
  fi
}

DeleteBranchIfMatchingCriteria() {
  branch=$1
  # has there been any action on this branch since this date
  if [ "$(git log $branch --since $date | wc -l)" -eq 0 ]; then
    local_branch_name=$(echo "$branch" | sed 's/^origin\///')
    if FilterOut "$local_branch_name" -eq 0; then
      DeleteBranch $local_branch_name
      numberDeleted=$((numberDeleted + 1))
    fi
  fi
}

echo "Deleting git branches older than $date and not merged into $root_branch"
for branch in $(git branch --remote --no-merged $root_branch); do
  DeleteBranchIfMatchingCriteria $branch
done

echo "Deleting git branches older than $date and merged into $root_branch"
for branch in $(git branch --remote --merged $root_branch); do
  DeleteBranchIfMatchingCriteria $branch
done

echo "Branch deletion complete. Deleted a total of $numberDeleted branches"

cd $OLDPWD