TTS interface

#!/bin/bash

function exiting()
{
    espeak -v whisper "$1"
    exit "$2"
}

function text_processing_and_storing()
{
    xclip -o -selection primary | sed -re "$primary_replacement" | tr '\n' ' ' | sed -re "$secondary_replacement" >> "$current_text_fragment_file"
    echo >> "$current_text_fragment_file"
    last_words="…"$(tail -1 "$current_text_fragment_file" | grep -Eo ".{,16}$")
}

function total_duration_evaluation()
{
    number_of_cyrillic_syllables=$(grep -ro "[аеёиоуыэюя]" "$text_directory"/*.txt | wc -l)
    number_of_latin_syllables=$(grep -ro "[aeiouy]" "$text_directory"/*.txt | wc -l)
    number_of_cyrillic_seconds=$(echo "scale=0; $number_of_cyrillic_syllables / 8.3" | bc -l)
    number_of_latin_seconds=$(echo "scale=0; $number_of_latin_syllables / 5" | bc -l)
    number_of_seconds=$(echo "$number_of_cyrillic_seconds + $number_of_latin_seconds" | bc -l)
    number_of_minutes=$(printf "%02d" $((number_of_seconds / 60)))
    number_of_remaining_seconds=$(printf "%02d" $((number_of_seconds % 60)))
    total_duration="$number_of_minutes:$number_of_remaining_seconds"
}

initial_dialog_display_flag="True"
texts_processing_interruption_flag="False"
last_words="… …"

# sed replacement patterns. There's a COMBINING ACUTE ACCENT in the
# second expression.
primary_replacement='s/\[[^]]*\]//g; s/[́)(}{"|«»]//g; s/#/ решетка /g; s/\*/ астериск /g; s/\+/ плюс /g; s/\// слэш /g; s/</ меньше /g; s/=/ равно /g; s/>/ больше /g; s/@/ собачка /g; s/\\/ бэкслэш /g; s/\^/ циркумфлекс /g; s/_/ подчеркивание /g; s/`/ бэктик /g; s/~/ тильда /g; s/#/ решетка /g; s/\$/ доллар /g; s/&/ амперсанд /g; s/([05-9])[  ]*%/\1 процентов /g; s/1[  ]*%/1 процент /g; s/([2-4])[  ]*%/\1 процента /g; s/%//g; s/([05-9])[  ]*°/\1 градусов /g; s/1[  ]*°/1 градус /g; s/([2-4])[  ]*°/\1 градуса /g; s/°//g; s/-$//g'
secondary_replacement='s/[[:space:]]+/ /g; s/([A-Za-z][^A-Za-zА-Яа-я]*)([А-Яа-я])/\1\n\2/g; s/([А-Яа-я][^A-Za-zА-Яа-я]*)([A-Za-z])/\1\n\2/g'

base_directory="/tmp/WTA_$(date +%y-%m-%d_%H-%M-%S)"
text_directory="$base_directory/text"
audio_directory="$base_directory/audio"
mkdir "$base_directory" "$text_directory" "$audio_directory"
cd "$base_directory" || exiting "Couldn't enter the base directory" 1

# GTK bookmarks: deletion and creation
sed -i '/^.*Audible$/d' ~/.config/gtk-3.0/bookmarks
echo "file://$base_directory Audible" >> ~/.config/gtk-3.0/bookmarks

while [ "$texts_processing_interruption_flag" == "False" ]; do
    while true; do
        if [ "$initial_dialog_display_flag" == "True" ]; then
            current_text_fragment_file="$text_directory"/$(date +%s%N).txt
            touch "$current_text_fragment_file"
            espeak -v whisper "Primary!" &
            total_duration_evaluation
            yad --title="Written to audible" \
                --text="Total audio duration: $total_duration\nLast stored words: $last_words\nSelect text and / or choose an action: " \
                --button="Append:2" \
                --button="Abort:1" \
                --borders=12 \
                --on-top \
                --geometry=-1-1
            if [ $? -eq 1 ] || [ $? -eq 252 ]; then
                exiting "Aborted!" 1
            else
                text_processing_and_storing
                initial_dialog_display_flag="False"
            fi
        else
            total_duration_evaluation
            yad --title="Written to audible" \
                --text="Total audio duration: $total_duration\nLast stored words: $last_words\nSelect text and / or choose an action: " \
                --button="Append:2" \
                --button="Next article:3" \
                --button="Convert:4" \
                --button="Abort:1" \
                --borders=12 \
                --on-top \
                --geometry=-1-1

            case "$?" in
                2)
                    text_processing_and_storing
                    ;;
                3)
                    initial_dialog_display_flag="True"
                    break
                    ;;
                4)
                    texts_processing_interruption_flag="True"
                    break
                    ;;
                1|252)
                    exiting "Aborted!" 1
                    ;;
                *)
                    true
                    ;;
            esac
        fi
    done

    if [ "$texts_processing_interruption_flag" == "True" ]; then
        break
    fi
done

for file in $text_directory/*.txt; do
    sox -r 44100 -c 1 -n "$audio_directory/$(date +%s%N)".wav synth 3 sine 220 vol -12dB
    while read -r line; do
        audio_chunk_file_path="$audio_directory/$(date +%s%N).wav"
        if [[ "$line" =~ ^.*[А-Яа-я].*$ ]]; then
            echo "$line" | RHVoice-client -s Anna -r 0.5 -v 1 | sox - --norm=-1 -r 44100 -c 1 "$audio_chunk_file_path"
        else
            espeak -s 160 -v english-us "$line" -w /dev/stdout | sox - --norm=-1 -r 44100 -c 1 "$audio_chunk_file_path"
        fi
    done < "$file"

    audio_files_number=$(ls "$audio_directory" | wc -l)
    if [ "$audio_files_number" -ge 1024 ]; then
        ulimit -n $((audio_files_number))
    fi

    sox "$audio_directory/*.wav" ~/Data/shared/"$(date +%d_%H_%M_%S).ogg"
    rm -f "$audio_directory"/*.wav
done

exiting "Done!" 0