#!/usr/bin/env zsh

function removeCurrentBranch {
  sed -E '/\*/d'
}

function removeMaster {
  sed -E '/master/d'
}

function leftTrim {
  sed -E 's/\*?[[:space:]]+//'
}

# Clean up all cleanly merged branches
for branch in $(git branch | removeCurrentBranch | removeMaster | leftTrim); do
    git rebase origin/master $branch &> /dev/null || git rebase --abort &> /dev/null

    if (git cherry origin/master $branch | grep '^+') {
        echo $branch is not merged
    } else {
        echo Deleting branch: $branch
    }
done

git branch --merged | removeCurrentBranch | removeMaster | leftTrim | xargs -n 1 git branch -d

# Ask about which other branches to delete interactively
file="/tmp/git-cleanup-branches-$(uuidgen)"

all_branches=($(git branch | removeCurrentBranch | leftTrim))

# write branches to file
for branch in $all_branches; do
  echo "keep $branch" >> $file
done

# write instructions to file
echo "
# All of your branches are listed above
# (except for the current branch, which you can't delete)
# change keep to d to delete the branch
# all other lines are ignored" >> $file

# prompt user to edit file
vim "$file"

# check each line of the file
cat $file | while read -r line; do
  # if the line starts with "d "
  if echo $line | grep --extended-regexp "^d " > /dev/null; then
    # delete the branch
    branch=$(echo $line | sed -E 's/^d //')
    git branch -D $branch
  fi
done

# clean up
rm $file