Quick script to take a multi-file tex document and make it more human-readable for software like Grammarly or other grammar checkers

prep_tex_for_grammarly.sh

#!/bin/bash

USAGE="Usage: $0 mainfile.tex outputfile.tex"

function usage {
    echo $USAGE
    exit 1
}

if [[ -z "$1" || -z "$2" ]]; then
    usage
elif [[ ! -f "$1" ]]; then
    echo "Main tex file is not a file"
    usage
elif [[ -e "$2" ]]; then
    echo "Output tex file exists, cowardly refusing to overwrite"
    usage
fi

if type "gsed" &> /dev/null; then
    echo "Using gsed"
    SED_CMD=gsed
else
    echo "Using sed"
    SED_CMD=sed
fi

cd $(dirname $1)
#detex -rl $1 | awk '// {print ""} {gsub(ORS,FS)}1' RS= | sed 's/^[ ]+//' > $2
latexpand $1 2> /dev/null | awk '/\\(section|chapter|subsection)/ {print "\n Section: " $0 "\n"; next} {print $0}' | $SED_CMD -E -e 's/~?\\ref\{[A-Za-z:_-]+\}/ 1/g' -e 's/\.\\@ ?/. /g' | detex -rl | awk '// {print ""} {gsub(ORS,FS)}1' RS= | $SED_CMD -E -e 's/^[ ]+//; s/ ([,.])/\1/g; s/[ ]+/ /g' -e 's/I\/O/IO/g'> $2