y U nO MoCk? Mocking text filter that I use from within vim. Because reasons.

yuno

#!/bin/bash 
# makes mocking alt caps text from stdin

upper=0
while IFS= read -N 1 line; do   
    if [[ "$line" =~ [[:space::]] ]]; then
        printf "%s" "$line"
    elif (( upper == 0 )); then
        printf "%s" "${line,}"
        upper=1
    else
        printf "%s" "${line^}"
        upper=0
    fi
done <&0