Mock someone's words

mock.sh

#!/bin/zsh

if [ -z "$1" ]; then
    echo "Usage: $0 <text to convert>"
    exit 1
fi

input="$*"
output=""
uppercase=0

for (( i=0; i<${#input}; i++ )); do
    char="${input:$i:1}"

    if [[ "$char" =~ [a-zA-Z] ]]; then
        if [ $uppercase -eq 0 ]; then
            output+="${char:l}"
            uppercase=1
        else
            output+="${char:u}"
            uppercase=0
        fi
    else
        output+="$char"
    fi
done

echo "$output" | pbcopy
echo "$output"
echo "(Copied to clipboard!)"