style: don't need require "formula"

Library/Homebrew/dev-cmd/audit.rb

@@ -838,15 +838,10 @@ module Homebrew
 
     def line_problems(line, _lineno)
       # Check for string interpolation of single values.
-      if line =~ /(system|inreplace|gsub!|change_make_var!).*[ ,]"#\{([\w.]+)\}"/
-        # TODO: check could be in RuboCop
-        problem "Don't need to interpolate \"#{Regexp.last_match(2)}\" with #{Regexp.last_match(1)}"
-      end
-
-      return unless @strict
+      return unless line =~ /(system|inreplace|gsub!|change_make_var!).*[ ,]"#\{([\w.]+)\}"/
 
       # TODO: check could be in RuboCop
-      problem "`#{Regexp.last_match(1)}` is now unnecessary" if line =~ /(require ["']formula["'])/
+      problem "Don't need to interpolate \"#{Regexp.last_match(2)}\" with #{Regexp.last_match(1)}"
     end
 
     def audit_reverse_migration

Library/Homebrew/rubocops/text.rb

@@ -6,7 +6,19 @@ module RuboCop
   module Cop
     module FormulaAudit
       class Text < FormulaCop
-        def audit_formula(_node, _class_node, _parent_class_node, body_node)
+        def audit_formula(node, _class_node, _parent_class_node, body_node)
+          @full_source_content = source_buffer(node).source
+
+          if match = @full_source_content.match(/^require ['"]formula['"]$/)
+            @offensive_node = node
+            @source_buf = source_buffer(node)
+            @line_no = match.pre_match.count("\n") + 1
+            @column = 0
+            @length = match[0].length
+            @offense_source_range = source_range(@source_buf, @line_no, @column, @length)
+            problem "`#{match}` is now unnecessary"
+          end
+
           if !find_node_method_by_name(body_node, :plist_options) &&
              find_method_def(body_node, :plist)
             problem "Please set plist_options when using a formula-defined plist."

Library/Homebrew/test/rubocops/text_spec.rb

@@ -6,6 +6,17 @@ describe RuboCop::Cop::FormulaAudit::Text do
   subject(:cop) { described_class.new }
 
   context "When auditing formula text" do
+    it "with `require \"formula\"` is present" do
+      expect_offense(<<~RUBY)
+        require "formula"
+        ^^^^^^^^^^^^^^^^^ `require "formula"` is now unnecessary
+        class Foo < Formula
+          url "https://brew.sh/foo-1.0.tgz"
+          homepage "https://brew.sh"
+        end
+      RUBY
+    end
+
     it "with both openssl and libressl optional dependencies" do
       expect_offense(<<~RUBY)
         class Foo < Formula