Replace special unicode characters (e.g. ❤) with code points in ASCII (e.g. \2764). Written with CSS in mind.

unicode-to-unihex.sh

#!/usr/bin/env bash

set -e

# Find unicode chars outside ASCII range recursively from this directory
chars=$(grep -r -P -n "[\x80-\xFF]" . | awk -F':' '{print $1 ";" $2}')

for fileandline in $chars; do
    arrIN=(${fileandline//;/ })
    filename=${arrIN[0]}
    linenumber=${arrIN[1]}

    # Print the whole line
    line=$(sed -n ${linenumber}p ${filename})
    # Get only the special character
    char=$(echo -en $line | sed -e 's/.*"\(.\)".*/\1/')

    # Use Python to convert to unicode hex
    unihex=$(python -c "print '%02X' % ord('$char'.decode('utf-8'))")

    echo -e "${filename}: ${char} → \\${unihex}"
    sed -i -e 's|'"$char"'|\\'"$unihex"'|' $filename
done