trans2zh

#!/usr/bin/env sh
# vim: ft=sh ts=4 sw=4 sts=4 et :

# Function to read input, concatenate it, and process it with 'trans'
process_input() {
    echo '----------------------------------------'
    echo '•'

    input=""
    line_empty=""

    # Concat all lines until an empty line is found
    while IFS= read -r line; do
        if [ -z "$line" ]; then
            line_empty=1
            break
        fi
        input="$input $line"
    done

    input=$(echo "$input" | sed 's/^ *//')

    # If input is empty:
    # 1. return 1 if the last line is not empty (received ctrl-d)
    # 2. otherwise return 0
    if [ -z "$input" ]; then
        if [ -n "$line_empty" ]; then
            return 0
        else
            return 1
        fi
    fi

    output=$(echo "$input" | trans -b -no-auto :zh)

    echo "◦"
    echo "$output"
    echo
}

# Continuously receive input from user until receiving ctrl-d (EOF)
while true; do
    if ! process_input; then
        break
    fi
done