word-style "track changes" with latexdiff and git

track_changes.sh

#!/bin/bash
#
# script to show word-style "track changes" from a previous git revision
#

if [ $# -lt 2 ]
then
    echo "usage: $0 <rev> <maintex>"
    echo "  rev is the prefix of a git revision hash"
    echo "  see 'git log' for revision hashes"
    echo
    echo "  mainttex is the main source file for pdflatex, e.g. main.tex"
    echo "  supports flattening of \input-ed tex from main source"
    echo
    echo "  output is in <rev>/changes.pdf"
    exit 1
fi

# get the path of the current directory relative to the git root
# http://stackoverflow.com/a/16951268/76259
rel_path=`dirname $(git ls-tree --full-name --name-only HEAD main.tex)`

# get the revision to compare to
rev=$1
[ -d $rev ] || mkdir $rev

# get the name of the main tex file
maintex=$2
# pull old versions of .tex files
sections=`grep -i input $maintex | awk -F'[{}]' '{print $2}'`
for section in $maintex $sections
do
    if echo $section | grep -qv '.tex$'
	then
	section=${section}.tex
    fi
    git show $rev:$rel_path/$section > $rev/$section
done

cd $rev

# symlink supporting files
for f in figures *.cls *.bib *.sty *.bst
do
    ln -s ../$f .
done

# generate diff with latexdiff, clean up, and produce pdf
latexdiff --flatten $maintex ../$maintex > changes.tex
dos2unix changes.tex
grep -v '^$' changes.tex > tmp
mv tmp changes.tex
pdflatex changes.tex