Fix NoSuchKegFromTapError handling

Library/Homebrew/cli/named_args.rb

@@ -423,7 +423,7 @@ def resolve_kegs(name)
             keg.tab.tap == requested_tap
           end
 
-          raise NoSuchKegFromTapError.new(requested_formula, requested_tap) if kegs.none?
+          raise NoSuchKegError.new(requested_formula, tap: requested_tap) if kegs.none?
         end
 
         raise NoSuchKegError, name if kegs.none?

Library/Homebrew/exceptions.rb

@@ -53,23 +53,14 @@ class NotAKegError < RuntimeError; end
 
 # Raised when a keg doesn't exist.
 class NoSuchKegError < RuntimeError
-  attr_reader :name
-
-  def initialize(name)
-    @name = name
-    super "No such keg: #{HOMEBREW_CELLAR}/#{name}"
-  end
-end
-
-# Raised when a keg from a specific tap doesn't exist.
-class NoSuchKegFromTapError < RuntimeError
   attr_reader :name, :tap
 
-  sig { params(name: String, tap: Tap).void }
-  def initialize(name, tap)
+  def initialize(name, tap: nil)
     @name = name
     @tap = tap
-    super "No such keg: #{HOMEBREW_CELLAR}/#{name} from tap #{tap}"
+    message = "No such keg: #{HOMEBREW_CELLAR}/#{name}"
+    message += " from tap #{tap}" if tap
+    super message
   end
 end
 

Library/Homebrew/test/cli/named_args_spec.rb

@@ -244,7 +244,7 @@ def setup_unredable_cask(name)
       it "raises an error if there is no tap match" do
         stub_formula_loader bar, "other/tap/bar"
 
-        expect { described_class.new("other/tap/bar").to_kegs }.to raise_error(NoSuchKegFromTapError)
+        expect { described_class.new("other/tap/bar").to_kegs }.to raise_error(NoSuchKegError, %r{from tap other/tap})
       end
     end
   end

Library/Homebrew/test/exceptions_spec.rb

@@ -19,18 +19,20 @@
     end
   end
 
-  describe NoSuchKegFromTapError do
-    subject(:error) { described_class.new("foo", tap) }
+  describe NoSuchKegError do
+    context "without a tap" do
+      subject(:error) { described_class.new("foo") }
 
-    let(:tap) { instance_double(Tap, to_s: "u/r") }
+      it(:to_s) { expect(error.to_s).to eq("No such keg: #{HOMEBREW_CELLAR}/foo") }
+    end
 
-    it(:to_s) { expect(error.to_s).to eq("No such keg: #{HOMEBREW_CELLAR}/foo from tap u/r") }
-  end
+    context "with a tap" do
+      subject(:error) { described_class.new("foo", tap:) }
 
-  describe NoSuchKegError do
-    subject(:error) { described_class.new("foo") }
+      let(:tap) { instance_double(Tap, to_s: "u/r") }
 
-    it(:to_s) { expect(error.to_s).to eq("No such keg: #{HOMEBREW_CELLAR}/foo") }
+      it(:to_s) { expect(error.to_s).to eq("No such keg: #{HOMEBREW_CELLAR}/foo from tap u/r") }
+    end
   end
 
   describe FormulaValidationError do