#!/bin/sh

if [ -z "$(command -v recode)" ]; then
    echo "recode needed."
    exit
fi


## Convert all 'bad' encoding to UTF-8/LF. WARNING: It will fail for encodings
## other the one explicitly supported below.
while read -r i; do
    CODING=$(file "$i")

    if [ -n "$(echo $CODING | grep 'ISO-8859')" ]; then
        echo "ISO-8859:   [$i]"
        recode latin1..utf-8 "$i"

    elif [ -n "$(echo $CODING | grep 'Non-ISO extended-ASCII')" ]; then
        echo "cp1252:     [$i]"
        recode cp1252..utf-8 "$i"

    elif [ -n "$(echo $CODING | grep 'UTF-16 Unicode text')" ]; then
        echo "UTF-16:     [$i]"
        recode utf-16..utf-8 "$i"

    elif [ -n "$(echo $CODING | grep 'UTF-8 Unicode (with BOM)')" ]; then
        echo "UTF-8 BOM:  [$i]"
        sed -i '1s/^.//' "$i"
        ## sed -i is not the fastest depending on the implementations. The
        ## following commands work, but may be overkill.
        # dd iflag=skip_bytes skip=3 if=file.srt of=temp.srt
        # dd bs=1 skip=3 if=file.srt of=temp.srt
        # tail -c +32 file.srt > temp.srt
    fi

    if [ -n "$(echo $CODING | grep 'CRLF')" ]; then
        echo "CRLF:       [$i]"
        sed -i 's/\r//g' "$i"
    fi

done <<EOF
$(find . -type f -size -50M -print)
EOF