add option to color outdated formulae

[kbrock]

When I am prompted to update software, I often wonder if I can just delete it instead

I updated your great script to highlight outdated formulae in red.

• Not sure about your color preferences.
• Only tested with graphviz
• if you have a preference instead of the double ternary (?:?:), just say so.

brew graph --outdated --installed --highlight-leaves | dot -Tpng -ograph.png

[martido]

Nice idea, thanks! Will check it out in the next couple of days.

[martido]

I'm very sorry that it took me so long to get back to you. I really like the idea. Thanks for contributing!

• If you don't mind, I'd like to rename the command line option to "highlight-outdated" to keep it consistent with the existing switch "highlight-leaves", and disable it by default.
• I've also tested the GraphML output. There's one tiny bit missing (the new option isn't passed to the create_node method), otherwise works perfectly.
• The double ternary is fine for now. If there's an additional option in the future, an if/else construct would make more sense, I guess.

[kbrock]

@martido ugh - just saw this. you want me to follow up with ^ ?

[kbrock]

ooh - you did already. sweet. thanks