brew-cleanup-orphans.zsh

#!/bin/zsh

KEEP_FORMULAS=(asdf bat fd fzf git htop httpie hub iftop jq ncdu neovim p7zip ruby-build the_silver_searcher tig tmux watch yq z zsh)

declare -A visited_formulas
for formula ($KEEP_FORMULAS); do
    echo "Keeping $formula"
    visited_formulas[$formula]=1
done

check_formulas() {
    for formula in "$@"; do
    if [[ -z `brew uses --installed $formula` ]] && ! (( ${+visited_formulas[$formula]} )) && [[ $formula != "brew-cask" ]]; then
        read "input?$formula is not depended on by other formulas. Remove? [y/N] "
        visited_formulas[$formula]=1
        if [[ "$input" == "y" ]]; then
            brew remove $formula
            check_formulas `brew deps --1 --installed $formula`
        fi
    fi
    done
}

echo "Searching for formulas not depended on by other formulas..."

check_formulas `brew list --formula`