From 677bb92ba93276a986a174ce05aa5d986534639c Mon Sep 17 00:00:00 2001
From: Bo Anderson <mail@boanderson.me>
Date: Thu, 25 Aug 2022 15:05:26 +0100
Subject: [PATCH 1/3] tap: add versioned_formula_files

---
 Library/Homebrew/tap.rb | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index c41753c6e7..545e0537aa 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -491,6 +491,13 @@ class Tap
     end
   end
 
+  # An array of all versioned {Formula} files of this {Tap}.
+  def versioned_formula_files
+    @versioned_formula_files ||= formula_files.select do |file|
+      file.basename(".rb").to_s =~ /@[\d.]+$/
+    end
+  end
+
   # An array of all {Cask} files of this {Tap}.
   def cask_files
     @cask_files ||= if cask_dir.directory?

From f09be9a5f75b44bfd16033af8b9ec456c24081c4 Mon Sep 17 00:00:00 2001
From: Bo Anderson <mail@boanderson.me>
Date: Thu, 25 Aug 2022 15:05:49 +0100
Subject: [PATCH 2/3] formula: try optimise `versioned_formulae_names`

---
 Library/Homebrew/formula.rb | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index e3974cbfa6..d1325960ae 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -447,7 +447,17 @@ class Formula
   # Returns any `@`-versioned formulae names for any formula (including versioned formulae).
   sig { returns(T::Array[String]) }
   def versioned_formulae_names
-    Pathname.glob(path.to_s.gsub(/(@[\d.]+)?\.rb$/, "@*.rb")).map do |versioned_path|
+    versioned_paths = if tap
+      # Faster path, due to `tap.versioned_formula_files` caching.
+      name_prefix = "#{name.gsub(/(@[\d.]+)?$/, "")}@"
+      tap.versioned_formula_files.select do |file|
+        file.basename.to_s.start_with?(name_prefix)
+      end
+    else
+      Pathname.glob(path.to_s.gsub(/(@[\d.]+)?\.rb$/, "@*.rb"))
+    end
+
+    versioned_paths.map do |versioned_path|
       next if versioned_path == path
 
       versioned_path.basename(".rb").to_s

From 768eb1d51abeb93fbbf3557a7c169add40ac7a2d Mon Sep 17 00:00:00 2001
From: Bo Anderson <mail@boanderson.me>
Date: Thu, 25 Aug 2022 16:13:24 +0100
Subject: [PATCH 3/3] test/formula_spec: stub `Tap#versioned_formulae_names`

---
 Library/Homebrew/test/formula_spec.rb | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Library/Homebrew/test/formula_spec.rb b/Library/Homebrew/test/formula_spec.rb
index 7b2de44182..71f997c3df 100644
--- a/Library/Homebrew/test/formula_spec.rb
+++ b/Library/Homebrew/test/formula_spec.rb
@@ -149,11 +149,15 @@ describe Formula do
       end
     end
 
+    before do
+      allow(Formulary).to receive(:load_formula_from_path).with(f2.name, f2.path).and_return(f2)
+      allow(Formulary).to receive(:factory).with(f2.name).and_return(f2)
+      allow(f.tap).to receive(:versioned_formula_files).and_return([f2.path])
+    end
+
     it "returns array with versioned formulae" do
       FileUtils.touch f.path
       FileUtils.touch f2.path
-      allow(Formulary).to receive(:load_formula_from_path).with(f2.name, f2.path).and_return(f2)
-      allow(Formulary).to receive(:factory).with(f2.name).and_return(f2)
       expect(f.versioned_formulae).to eq [f2]
     end