#!/bin/sh

if [  "$1" = "--help" ] || [ "$1" = "-h" ]; then
    cat <<EOF
Usage: ${0##*/} [FILES]

Convert non-ASCII characters to their ASCII equivalent. If files are provided,
convert them in-place. Otherwise convert standard input to standard output.

EOF
    exit
fi

_asciify()
{
    unset OPT
    if [ $# -ge 1 ]; then
        OPT=-i
    fi

    sed $OPT \
        -e 's/[áàâä]/a/g' \
        -e 's/[éèêë]/e/g' \
        -e 's/[íìîï]/i/g' \
        -e 's/[óòôö]/o/g' \
        -e 's/[úùûü]/u/g' \
        -e 's/[ýỳŷÿ]/y/g' \
        -e 's/[ÁÀÂÄ]/A/g' \
        -e 's/[ÉÈÊË]/E/g' \
        -e 's/[ÍÌÎÏ]/I/g' \
        -e 's/[ÓÒÔÖ]/O/g' \
        -e 's/[ÚÙÛÜ]/U/g' \
        -e 's/[ÝỲŶŸ]/Y/g' \
        -e 's/[ñ]/n/g' \
        -e 's/[œ]/oe/g' \
        -e 's/[Œ]/Oe/g' \
        -e 's/[æ]/ae/g' \
        -e 's/[Æ]/Ae/g' \
        -e 's/[ç]/c/g' \
        -e 's/[Ç]/C/g' \
        -e 's/[ß]/ss/g' \
        -e 's/[«»„“”‚‘’]/"/g' \
        -e 's/[©]/(C)/g' \
        -e 's/[®]/(R)/g' \
        -e 's/[™]/(TM)/g' \
        -e 's/[¥]/Y/g' \
        -e 's/[Ð]/D/g' \
        -e 's/[ŀ]/l/g' \
        -e 's/[Ŀ]/L/g' \
        -e 's/[€]/euro/g' \
        -e 's/[¢]/cent/g' \
        -e 's/[£]/pound/g' \
        -e 's/[µ]/mu/g' \
        -e 's/[²]/^2/g' \
        -e 's/[³]/^3/g' \
        -e 's/[¡]/!/g' \
        -e 's/[¿]/?/g' \
        -e 's/[–‑]/-/g' \
        -e 's/[…]/.../g' \
        -e 's/[≤]/<=/g' \
        -e 's/[≥]/>=/g' \
        -e 's/[±]/+\/-/g' \
        -e 's/[≠]/!=/g' \
        -e 's/[⋅]/./g' \
        -e 's/[×]/x/g' \
        -e 's/[÷]/\//g' \
        -e 's/[↓]/|/g' \
        -e 's/[↑]/^/g' \
        -e 's/[←]/<=/g' \
        -e 's/[→]/=>/g' \
        "$@"
}

if [ $# -ge 1 ]; then
    for i; do
        _asciify "$i"
    done
else
    _asciify
fi