a simply utility to call to determine if something is already installed via homebrew.
I use this in conjunction with yadm to make my bootstrap scripts idempotent.
USAGE: is_brewed <formula name>
Outputs 'true' or 'false' and exits with 0 or 1 respectively.
If the package is not found it'll look for similarly
named packages and output additional lines, if it finds
any that contain your input.
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