bump: skip PR checking when up to date

`brew bump` will check for PRs related to a package even if the
package version and livecheck version are the same. We're presumably
only interested in related PRs when the livecheck version differs, so
we can reduce GitHub API requests by skipping the check(s) when the
versions are equal. We use `bump` in `autobump` workflows, so this
should help with recent rate limiting issues (e.g., 3203 out of 3426
autobumped formulae were up to date in a recent run).

This also reworks the output for duplicate PRs, making it clear when
`bump` skipped checking PRs (as printing "none" would suggest that
PRs were checked) and only printing the "Maybe duplicate" information
when checked. This makes it a little easier to understand what `bump`
has done internally from the output.

Library/Homebrew/bump_version_parser.rb

@@ -48,5 +48,12 @@ module Homebrew
     def blank?
       @general.blank? && @arm.blank? && @intel.blank?
     end
+
+    sig { params(other: T.untyped).returns(T::Boolean) }
+    def ==(other)
+      return false unless other.is_a?(BumpVersionParser)
+
+      (general == other.general) && (arm == other.arm) && (intel == other.intel)
+    end
   end
 end

Library/Homebrew/dev-cmd/bump.rb

@@ -277,8 +277,9 @@ module Homebrew
           odebug "Error fetching pull requests for #{formula_or_cask} #{name}: #{e}"
           nil
         end
+        return if pull_requests.blank?
 
-        pull_requests&.map { |pr| "#{pr["title"]} (#{Formatter.url(pr["html_url"])})" }&.join(", ")
+        pull_requests.map { |pr| "#{pr["title"]} (#{Formatter.url(pr["html_url"])})" }.join(", ")
       end
 
       sig {
@@ -373,13 +374,17 @@ module Homebrew
           new_version.general.to_s
         end
 
-        duplicate_pull_requests = unless args.no_pull_requests?
-          retrieve_pull_requests(formula_or_cask, name, version: pull_request_version)
-        end.presence
+        if !args.no_pull_requests? && (new_version != current_version)
+          duplicate_pull_requests = retrieve_pull_requests(
+            formula_or_cask,
+            name,
+            version: pull_request_version,
+          )
 
-        maybe_duplicate_pull_requests = if !args.no_pull_requests? && duplicate_pull_requests.blank?
-          retrieve_pull_requests(formula_or_cask, name)
-        end.presence
+          maybe_duplicate_pull_requests = if duplicate_pull_requests.nil?
+            retrieve_pull_requests(formula_or_cask, name)
+          end
+        end
 
         VersionBumpInfo.new(
           type:,
@@ -411,9 +416,7 @@ module Homebrew
         repology_latest = version_info.repology_latest
 
         # Check if all versions are equal
-        versions_equal = [:arm, :intel, :general].all? do |key|
-          current_version.send(key) == new_version.send(key)
-        end
+        versions_equal = (new_version == current_version)
 
         title_name = ambiguous_cask ? "#{name} (cask)" : name
         title = if (repology_latest == current_version.general || !repology_latest.is_a?(Version)) && versions_equal
@@ -439,8 +442,8 @@ module Homebrew
         end
 
         version_label = version_info.version_name
-        duplicate_pull_requests = version_info.duplicate_pull_requests.presence
-        maybe_duplicate_pull_requests = version_info.maybe_duplicate_pull_requests.presence
+        duplicate_pull_requests = version_info.duplicate_pull_requests
+        maybe_duplicate_pull_requests = version_info.maybe_duplicate_pull_requests
 
         ohai title
         puts <<~EOS
@@ -457,10 +460,22 @@ module Homebrew
                                       #{outdated_synced_formulae.join(", ")}.
           EOS
         end
-        puts <<~EOS unless args.no_pull_requests?
-          Duplicate pull requests:       #{duplicate_pull_requests       || "none"}
-          Maybe duplicate pull requests: #{maybe_duplicate_pull_requests || "none"}
-        EOS
+        if !args.no_pull_requests? && !versions_equal
+          if duplicate_pull_requests
+            duplicate_pull_requests_text = duplicate_pull_requests
+          elsif maybe_duplicate_pull_requests
+            duplicate_pull_requests_text = "none"
+            maybe_duplicate_pull_requests_text = maybe_duplicate_pull_requests
+          else
+            duplicate_pull_requests_text = "none"
+            maybe_duplicate_pull_requests_text = "none"
+          end
+
+          puts "Duplicate pull requests:  #{duplicate_pull_requests_text}"
+          if maybe_duplicate_pull_requests_text
+            puts "Maybe duplicate pull requests: #{maybe_duplicate_pull_requests_text}"
+          end
+        end
 
         return unless args.open_pr?
 

Library/Homebrew/test/bump_version_parser_spec.rb

@@ -69,4 +69,39 @@ RSpec.describe Homebrew::BumpVersionParser do
       end
     end
   end
+
+  describe "#==" do
+    let(:new_version) { described_class.new(general: general_version, arm: arm_version, intel: intel_version) }
+
+    context "when other object is not a `BumpVersionParser`" do
+      it "returns false" do
+        expect(new_version == Version.new("1.2.3")).to be(false)
+      end
+    end
+
+    context "when comparing objects with equal versions" do
+      it "returns true" do
+        same_version = described_class.new(general: general_version, arm: arm_version, intel: intel_version)
+        expect(new_version == same_version).to be(true)
+      end
+    end
+
+    context "when comparing objects with different versions" do
+      it "returns false" do
+        different_general_version = described_class.new(general: "3.2.1", arm: arm_version, intel: intel_version)
+        different_arm_version = described_class.new(general: general_version, arm: "4.3.2", intel: intel_version)
+        different_intel_version = described_class.new(general: general_version, arm: arm_version, intel: "5.4.3")
+        different_general_arm_versions = described_class.new(general: "3.2.1", arm: "4.3.2", intel: intel_version)
+        different_arm_intel_versions = described_class.new(general: general_version, arm: "4.3.2", intel: "5.4.3")
+        different_general_intel_versions = described_class.new(general: "3.2.1", arm: arm_version, intel: "5.4.3")
+
+        expect(new_version == different_general_version).to be(false)
+        expect(new_version == different_arm_version).to be(false)
+        expect(new_version == different_intel_version).to be(false)
+        expect(new_version == different_general_arm_versions).to be(false)
+        expect(new_version == different_arm_intel_versions).to be(false)
+        expect(new_version == different_general_intel_versions).to be(false)
+      end
+    end
+  end
 end