audit: Port FileUtils, inreplace audit rules in audit_lines to rubocop

Library/Homebrew/dev-cmd/audit.rb

@@ -809,17 +809,6 @@ class FormulaAuditor
   end
 
   def line_problems(line, _lineno)
-    # FileUtils is included in Formula
-    # encfs modifies a file with this name, so check for some leading characters
-    if line =~ %r{[^'"/]FileUtils\.(\w+)}
-      problem "Don't need 'FileUtils.' before #{Regexp.last_match(1)}."
-    end
-
-    # Check for long inreplace block vars
-    if line =~ /inreplace .* do \|(.{2,})\|/
-      problem "\"inreplace <filenames> do |s|\" is preferred over \"|#{Regexp.last_match(1)}|\"."
-    end
-
     # Check for string interpolation of single values.
     if line =~ /(system|inreplace|gsub!|change_make_var!).*[ ,]"#\{([\w.]+)\}"/
       problem "Don't need to interpolate \"#{Regexp.last_match(2)}\" with #{Regexp.last_match(1)}"

Library/Homebrew/rubocops/extend/formula_cop.rb

@@ -85,9 +85,13 @@ module RuboCop
       end
 
       # Returns an array of method call nodes matching method_name in every descendant of node
-      def find_every_method_call_by_name(node, method_name)
+      # Returns every method call if no method_name is passed
+      def find_every_method_call_by_name(node, method_name = nil)
         return if node.nil?
-        node.each_descendant(:send).select { |method_node| method_name == method_node.method_name }
+        node.each_descendant(:send).select do |method_node|
+          method_name.nil? ||
+            method_name == method_node.method_name
+        end
       end
 
       # Given a method_name and arguments, yields to a block with
@@ -107,7 +111,7 @@ module RuboCop
       def find_instance_method_call(node, instance, method_name)
         methods = find_every_method_call_by_name(node, method_name)
         methods.each do |method|
-          next unless method.receiver.const_name == instance
+          next unless method.receiver && method.receiver.const_name == instance
           @offense_source_range = method.source_range
           @offensive_node = method
           yield method
@@ -188,9 +192,15 @@ module RuboCop
       end
 
       # Returns an array of block nodes of any depth below node in AST
+      # If a block is given then yields matching block node to the block!
       def find_all_blocks(node, block_name)
         return if node.nil?
-        node.each_descendant(:block).select { |block_node| block_name == block_node.method_name }
+        blocks = node.each_descendant(:block).select { |block_node| block_name == block_node.method_name }
+        return blocks unless block_given?
+        blocks.each do |block_node|
+          offending_node(block_node)
+          yield block_node
+        end
       end
 
       # Returns a method definition node with method_name

Library/Homebrew/rubocops/lines_cop.rb

@@ -58,6 +58,23 @@ module RuboCop
           end
         end
       end
+
+      class Miscellaneous < FormulaCop
+        def audit_formula(_node, _class_node, _parent_class_node, body_node)
+          # FileUtils is included in Formula
+          # encfs modifies a file with this name, so check for some leading characters
+          find_instance_method_call(body_node, "FileUtils", nil) do |method_node|
+            problem "Don't need 'FileUtils.' before #{method_node.method_name}"
+          end
+
+          # Check for long inreplace block vars
+          find_all_blocks(body_node, :inreplace) do |node|
+            block_arg = node.arguments.children.first
+            next unless block_arg.source.size>1
+            problem "\"inreplace <filenames> do |s|\" is preferred over \"|#{block_arg.source}|\"."
+          end
+        end
+      end
     end
   end
 end