Allow fuzzy matching of contiguous letters (i.e. `co mas` would do `git checkout master`)

git checkout fuzzy match

branch=$( git branch | tr -d '*' | grep $1 )

current_branch() {
  echo $(git rev-parse --abbrev-ref HEAD)
}

starting_branch=$(current_branch)

# This function lists all branches with an index (starting at 1)
list_all_branches() {
  let i=1
  for branch_name in $branch
    do echo "$i) $branch_name"
    (( i = i + 1 ))
  done
}

# Helper method to print an error message if git checkout did not succeed
ensure_success() {
 # rather than checking error code, we check that our git branch is different
 # becuase git can "checkout" a file or path, just like a branch

  if [ $starting_branch == $(current_branch) ]; then
    echo
    echo "Oops! Looks like something went wrong. Please try again!"
  fi
}

checkout_branch() {
  input=$1
  let i=1

  for branch_name in $branch
    do if [[ $i -eq $input ]]; then
      git checkout $branch_name
      ensure_success $?
      exit;
    else
      (( i = i + 1 ));
    fi
  done

}

num_of_branches_found=$(echo $branch | wc | awk '{printf $2}')

if [[ $num_of_branches_found -eq 0 ]]; then
  echo "Did not find a branch with that string (Double check your spelling)"
  exit

  elif [[ $num_of_branches_found -gt 1 ]]; then
    echo "Oops! More than one branch by that name found, please be more specific in your search..."
    list_all_branches
    read -p "Select one of the numbers above, or enter q to exit: " input
    echo
    case $input in
      [q]* ) exit;;
      [0-9]* ) checkout_branch $input;;
      * ) echo Next time, enter 'q' or a digit
    esac
    exit
fi

# If we get to here, we only got one match (:
git checkout $branch