homebrew dependency tree with graphviz

brewviz.sh

#!/bin/bash

set -e -u -o pipefail

{
    echo 'digraph G {'
    
    brew list | while read cask; do
        printf '"%s";\n' $cask
        brew deps $cask | while read dep; do
            printf '"%s" -> "%s";\n' $cask $dep
        done
    done
    
    echo '}'
} > brew_deps.dot

dot -T png -o brew_deps.png brew_deps.dot