refactor

#!/bin/bash

git ls-files '*.st' -z | 								# List all files, then iterate through them and save their content
	while IFS= read -rd '' f; do \
		contents=$( \
			sed -E 's/(\S)(@)/\1\ \2/g' < "$f" | 				# Add spaces before '@'
			sed -E 's/(@)(\S)/\1\ \2/g' | 					# Add spaces after '@'
			sed -E 's/([aA])(\s?M2)/\1n\2/g' |				# Replace 'aM2', 'a M2', 'A M2', 'AM2' with 'anM2', 'an M2', 'An M2', 'AnM2'
			sed -E 's/(\()(\s+)/\1/g' |					# Remove spaces after opening brackets
			sed -E 's/(\s+)(\))/\2/g' |					# Remove spaces before closing brackets
			sed -E 's/(\S)(\s+)$/\1/g' |					# Remove trailing spaces
			perl -p0e 's/^([^\[]+?)(\s\s+)(\|)/\1\n\t\3/s' |		# Remove empty lines before args
			perl -p0e 's/^([^\[]+?)(\|)(\s\s+)([^\s])/\1\2\n\t\4/s' |	# Remove empty lines after args
			perl -p0e 's/(\.)(\s*)$/\2/s' );				# Remove final point
		echo "$contents" > "$f";						# Write back file. Fixes any wrong newlines.
	done
git ls-files '*.md' -z |
    while IFS= read -rd '' f; do \
        contents=$( \
            sed -E 's/([aA])(\s?M2)/\1n\2/g' < "$f" );				# Replace 'aM2', 'a M2', 'A M2', 'AM2' with 'anM2', 'an M2', 'An M2', 'AnM2'
        echo "$contents" > "$f";
    done