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cleaner: rewrite pkg-config file Cellar paths and keg-only #18229

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@cho-m cho-m commented Sep 2, 2024

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Concept idea based on manual work in Homebrew/core, e.g.

pc_files.each do |pc_file|
any_modification = T.let(false, T::Boolean)
lines = pc_file.each_line.map do |line|
any_modification ||= line.gsub!(@formula.prefix.realpath.to_s, @formula.opt_prefix.to_s).present?
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One thing is that this doesn't handle multiple copies of formula in Cellar. I guess the more accurate way would be to handle this during link/unlink but that makes logic a bit more complex than always using opt path.

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I think it's fine to not handle multiple formulae in Cellar.

keg_only_pc_files = @formula.deps
.reject { |d| d.build? || d.test? }
.map(&:to_formula)
.select(&:keg_only?)
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Perhaps controversial idea: I think this could be usefully done for all formulae, not just keg-only. We've debated for a while about whether we should try to support formulae when brew unlinked and, generally, I think we should.

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