Douglas Eichelberger
1e1d35e37c
brew leaves was calling Dependency#to_installed_formula -> Formulary.resolve
for every runtime dependency of every installed formula. This triggered
filesystem I/O (reading tabs, resolving symlinks, loading formula files) for
each of those calls, accounting for ~45% of total wall time.
Instead, read dependency names directly from each formula's keg tab data
(Keg#runtime_dependencies returns [{full_name: ...}] hashes) and build a Set
of base names for O(1) membership tests. A fallback to the original
installed_runtime_formula_dependencies path is kept for pre-1.1.6
installations that have no runtime_dependencies in their tabs.
For cask dependencies, use CaskDependent#deps (string names only) instead of
CaskDependent#runtime_dependencies (which called to_installed_formula).
Transitive cask formula deps are already captured by the main tab-data loop.
Use Formula#possible_names ([name, *oldnames, *aliases]) for the membership
check so renamed formulae (stale tab records old name) are correctly excluded
from leaves. As a side-effect, this also eliminates the unintended
"Warning: Formula foo was renamed to bar." stderr output that the original
code emitted on every brew leaves run when stale tabs referenced old names.
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