git-delete-merged-branches.bash

#!/bin/bash
shopt -s expand_aliases

function prompt_to_continue()
{
  read -p "Continue (y/n)? "
  if [ "$REPLY" != "y" ]; then
    exit 0
  fi  
}

alias filter_branches="sed 's/^[ \*]*//g' | grep -Ev '^(master|release|production|staging|demo|heroku|HEAD)'"

base_branch="master"
git checkout $base_branch
 
# Update our list of remotes
git fetch || exit -1
git remote prune origin || exit -1


# Remove local fully merged branches
merged_branches=$(git branch --merged $base_branch | filter_branches)

if [ "$merged_branches" = "" ]; then
  echo 'No local branches need deletion'
else
  echo ''
  echo "The following LOCAL branches are fully merged and will be removed"
  for branch in $merged_branches ; do
    echo "  $branch"
  done
  echo ''

  prompt_to_continue

  for branch in $merged_branches ; do
    git branch -d $branch || exit -1
  done
fi

# Show remote fully merged branches
merged_branches=$(git branch -r --merged $base_branch | sed 's/ *origin\///' | filter_branches)

if [ "$merged_branches" = "" ]; then
  echo 'No remote branches need deletion'
else
  echo ''
  echo "The following remote branches are fully merged and will be removed:"
  for branch in $merged_branches ; do
    echo "  $branch"
  done
  echo ''
 
  prompt_to_continue || exit -1

  # Remove remote fully merged branches
  for branch in $merged_branches ; do
    git push origin :$branch || exit -1
  done
  echo "Obsolete branches are removed"
fi