Bash script to download subtitles

autosubtitle.sh

#!/bin/bash


agent="SubDB/1.0 (autoSubtitle/0.1; http://github.com)"

process_file_f() {

    ffull="$1"
    # fpath=${ffull%/*}
    ffn=${ffull##*/}
    fext=${ffn##*.}
    fname=${ffn%.*}

    printf "\n---\nProcessando: $ffull ...\n"

    tmp=$(mktemp)
    dd if="$ffull" bs=1 count=65536 of=$tmp >& /dev/null
    # size=$(ls -l "$ffull" | awk '{print $5}')
    size=$(wc -c < "$ffull")
    skip=$((size-65536))
    dd if="$ffull" bs=1 count=65536 of=$tmp skip=$skip oflag=append conv=notrunc >& /dev/null
    hash=$(md5sum -b $tmp | awk '{print $1}')
    rm $tmp
    printf "\nHash: $hash\n"

    langs=$(curl -X GET -s -H "User-Agent: $agent" "http://api.thesubdb.com/?action=search&hash=$hash&versions")
    printf "Linguagens: $langs\n"

    if [[ $langs = *"pt"* ]]; then

        printf "Baixando portugues..."

        tmp=$(mktemp)
        curl -X GET -is -H "User-Agent: $agent" -o $tmp "http://api.thesubdb.com/?action=download&hash=$hash&language=pt"

        ext=$(cat $tmp | dos2unix | awk -F. '/filename=/{print $NF}')
        # outfn="$fname-pt.$ext"
        outfn="$fname.$ext"
        if [ -f "$outfn" ]; then cp -f "$outfn"{,.bak}; fi
        cat $tmp | dos2unix | sed '1,/^$/d' > "$outfn"
        rm $tmp

        printf " ok --> $outfn\n\n"
    elif [[ $langs = *"en"* ]]; then

        printf "Baixando ingles..."

        tmp=$(mktemp)
        curl -X GET -is -H "User-Agent: $agent" -o $tmp "http://api.thesubdb.com/?action=download&hash=$hash&language=en"

        ext=$(cat $tmp | dos2unix | awk -F. '/filename=/{print $NF}')
        outfn="$fname-en.$ext"
        if [ -f "$outfn" ]; then cp -f "$outfn"{,.bak}; fi
        cat $tmp | dos2unix | sed '1,/^$/d' > "$outfn"
        rm $tmp

        printf " ok --> $outfn\n\n"
    else
        printf "\nNada pra baixar...\n\n"
    fi
}

if [[ -d $1 ]]; then

    cd "$1"

    shopt -s nullglob nocaseglob

    for video in *.{avi,mkv,mp4,mov,mpg,wmv}; do
        size=$(wc -c < "$video")
        if [ $size -ge 20000000 ]; then  # muito pequeno, deve ser uma amostra... vamos ignorar...
            process_file_f "$video"
        fi
    done

elif [[ -f "$1" ]]; then

    file=$(realpath $1);

    cd ${file%/*}  # isso espande para o path do arquivo

    process_file_f "$1"

else
    printf "\nErro: Sem argumentos!\n\n\tUso: $0 <arquivo de video | diretorio com multiplos videos>\n\n"
fi