Fix various problems in .vim/spell/update.sh

#!/bin/bash

SPELL_DIR=`dirname $0`

GIT_DIR=`git rev-parse --git-dir`

declare -a FILES

set -eu

if [ -z "${DEBUG}" ]; then

if [ -z "${DEBUG-}" ]; then

	silent_flag=-s

	quit_flag="-c :q"

else

	set -x

fi

unset NVIM_LISTEN_ADDRESS

: ${VIM_BIN:=~/.vim/bin/vim.remote}

SPELL_DIR=`dirname $0`

GIT_DIR=`git rev-parse --git-dir`

declare -a FILES=()

# remove commented-out entries

ex -E ${silent_flag} -c ':runtime spell/cleanadd.vim' ${quit_flag}

sed -i.bac '/^#[^#].*/d' "$SPELL_DIR"/*.add

for file in "$SPELL_DIR"/*.add; do

	mv "${file}" "${file}.tmp"

	sort -f -u "${file}.tmp" > "${file}"

	rm "${file}.tmp"

	ex -E ${silent_flag} -c ':mkspell! %' ${quit_flag} "${file}"

	${VIM_BIN} -E ${silent_flag-} -c ':mkspell! %' ${quit_flag-} "${file}"

	[[ $(basename $file) =~ ^en ]] || FILES+=( "${file}" "${file}.spl" )

done

elif [ -e "$GIT_DIR"/MERGE_MSG ]; then

	git commit --include "${FILES[@]}"

else

	git commit --only "${FILES[@]}" -F- <<-END_MESSAGE

	git add "${FILES[@]}"

	git commit -F- <<-END_MESSAGE

		Add vim spell file updates from `hostname` `date +%D`

		Automatically generated: