Shell script to run latexdiff against a TeX file (with specified commit hash) from the current repository.

git-latexdiff.sh

#!/usr/bin/env bash

# Shell script to run latexdiff against the same file from a specified commit hash.

# Example:
#   ./git-latexdiff.sh main.tex 12dfa1a

# $1 is the name of the old tex file (relative to the remote repo)
# $2 is the hash of the commit that we'd like to compare against

# paths
DIFFDIR=$(mktemp -du ./git-latexdiff.XXXXXX)
ORIDIR=`pwd`

# command line arguments
TEX=$1
VER=$2

# get the name of the TeX file without extension
TEXNAME=$(basename "$TEX")
EXTENSION="${TEXNAME##*.}"
TEXNAME="${TEXNAME%.*}"

# if no hash is specified, use head
if [ -z "$2" ];then
        VER='HEAD'
fi

# if no file is specified, guess from file with `begin{document}''
if [ -z "$1" ];then
        TEX=`grep  'begin{document}' *.tex | grep -m 1 begin | cut -d\: -f1`
fi

# clone current repo into DIFFDIR, checkout version hash
git clone . "$DIFFDIR/"
cd "$DIFFDIR"
git checkout $VER
git reset --hard

# run latex, bibtex, latex, pdflatex (for refs)
latex -interaction=nonstopmode "$TEX" $OPTIONS
bibtex main.aux
latex -interaction=nonstopmode "$TEX" $OPTIONS
pdflatex -interaction=nonstopmode -shell-escape "$TEX" $OPTIONS

# run latexdiff on tex files (with flatten option)
latexdiff --flatten "$TEX" "$ORIDIR/$TEX" > latexdiff.tex

# run latex, bibtex on latexdiff
latex -interaction=nonstopmode latexdiff.tex $OPTIONS
bibtex latexdiff.aux

# run latexdiff on bbl files
latexdiff --t CTRADITIONAL --append-context2cmd="abstract" $TEXNAME.bbl $ORIDIR/$TEXNAME.bbl > latexdiff.bbl

# run latex, pdflatex to get final product
latex -interaction=nonstopmode latexdiff.tex $OPTIONS
pdflatex -interaction=nonstopmode -shell-escape latexdiff.tex $OPTIONS

# move latexdiff to the original directory
mv latexdiff.pdf $ORIDIR/latexdiff-$2.pdf

cd $ORIDIR
rm -rf $TMPDIR

Seems to have some issues with \abstract{} the environment (abstract text is currently not marked up).
There is some discussion of this here https://www.researchgate.net/post/How_can_I_track_changes_in_LaTeX_especially_abstractenvironment