ansi2escp2.sh

#!/bin/sh
exec 9<<-'EOF'
    # Convert compound ANSI to simple ANSI
    : 9
    s/\(\x1b\[\)\([^;]*\);/\1\2m\1/g
    t 9

    # Remove leading/implied zeroes
    s/\(\x1b\[\)0\([^m]\{0,\}m\)/\1\2/g

    # Translate ANSI to ESC-P2
    s/\[1m/P/g
    s/\[3m/4/g
    s/\[4m/-1/g
    s/\(\x1b\)\[m/\1F\15\1-0\1r\x0f\1r\x10/g

    # Strip remaining unconverted ANSI
    s/\x1b\[[0-9]\{1,\}m//g
EOF
ANSI2ESCP2=$( cat <&9 )
if [ -t 0 -a $# -lt 1 ]; then
    script -aqt0 /dev/null
else
    cat "$@"
fi | sed -e "$ANSI2ESCP2"