pwdiff

#!/bin/bash

# Adapted from https://github.com/jduckles/pwdiff

oldfile='temp-old.md'
newfile='temp-new.md'

# Remove all formatting from the files
cat $1 | sed 's/<span[^>]*>//g' | sed 's/<\/span>//g' | sed -r 's/<\/?[ib]>//g' > ${oldfile}
cat $2 | sed 's/<span[^>]*>//g' | sed 's/<\/span>//g' | sed -r 's/<\/?[ib]>//g' > ${newfile}

context_lines=65535 # Set to be very large to include whole document as output.

# Select the SED option for advanced regex. Could be -r or -E.
SED_OPTION=( -r )
if ! echo '<span className="test"># Test' | sed $SED_OPTION 's/(<span[^>]*>)(#+ |- )/\2\1/g' > /dev/null 2>&1; then
    SED_OPTION=( -E )
fi

DIFF=`git diff -U${context_lines}  --no-index --word-diff -- ${oldfile} ${newfile} |\
    tail +6  |\
    sed 's/\[-/<del>/g;s/-]/<\/del>/g;' |\
    sed 's/{+/<span class="inserted-text">/g;s/+}/<\/span>/g;' |\
    sed $SED_OPTION 's/(<span[^>]*>)(#+ |- )/\2\1/g'` # Move spans after head/bullet

if [ -z "$DIFF" ]; then
    cat $newfile
else
    echo "$DIFF"
fi

rm $oldfile $newfile