prune_git_branches.sh

#!/bin/bash
# Adapted to work with OSX as of Feb 2025


# Fetch the latest state of remote branches and prune deleted branches
git fetch --prune

# brew install coreutils for `gdate`
# Get the current date minus 365 days
THRESHOLD_DATE=$(gdate -d '365 days ago' +%s)

# Loop through remote branches
for branch in $(git branch -r | grep -v '\->'); do
    # Get the last commit date of the branch
    LAST_COMMIT_DATE=$(git log -1 --format=%ct "${branch}")
  
    # Check if the branch is older than the threshold
    if [[ $LAST_COMMIT_DATE -lt $THRESHOLD_DATE ]]; then
         # Delete the remote branch if it's older than 365 days
         echo "Deleting branch: ${branch#origin\/}"  # Inform about the deletion
         git push origin --delete "${branch#origin\/}"  # Delete the branch
  fi
done