wave.sh

#!/usr/bin/env bash
# wave.sh: Add ~ character before specific patterns in LaTeX files
# Copyright (C) 2017-2018 Libor Polčák
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

function fix_space_before {
	FIND=$1
	FILE=$2

	# See also https://stackoverflow.com/questions/12129870/how-can-i-remove-a-line-feed-newline-before-a-pattern-using-sed
	sed -i ":r;\$!{N;br};s/\n *${FIND}/~${FIND}/g" "$FILE"
	sed -i "s/ ${FIND}/~${FIND}/g" "$FILE"
}

function fix_space_after {
	FIND=$1
	REPLACEMENT=$2
	FILE=$3

	# See also https://stackoverflow.com/questions/12129870/how-can-i-remove-a-line-feed-newline-before-a-pattern-using-sed
	sed -i ":r;\$!{N;br};s/\(${FIND}\)\n/\1${REPLACEMENT}/g" "$FILE"
	sed -i "s/\(${FIND}\) \b/\1${REPLACEMENT}/g" "$FILE"
}

function fix_file() {
	# Fix \cite and \ref
	fix_space_before '\\cite' $1
	fix_space_before '\\ref' $1
	# Squeeze (number)\nsqueeze on the previous line
	fix_space_after '([0-9]\+)' '~' $1
	# Do not leave (a), (b), (c) ... or (1), (2), (3) on the end of the line
	fix_space_after '([a-z0-9])' '~' $1

	# Some of the https://english.stackexchange.com/questions/67089/english-line-breaking-rules
	fix_space_after '\ba\b' '~' $1
	fix_space_after '\ban\b' '~' $1
	fix_space_after '\bthe\b' '~' $1
	#fix_space_after '\bwhich\b' '\\nolinebreak[3] ' $1
	#fix_space_after '\bthat\b' '\\nolinebreak[3] ' $1
	#fix_space_after '\bwho\b' '\\nolinebreak[3] ' $1
}

while [ $# -gt 0 ];
do
	fix_file $1
	shift
done