Revert "audit: Port audit_checksum method to rubocop and add tests"

Library/.rubocop.yml

@@ -12,9 +12,6 @@ FormulaAudit/Text:
 FormulaAudit/Caveats:
   Enabled: true
 
-FormulaAudit/Checksum:
-  Enabled: true
-
 FormulaAuditStrict/BottleBlock:
   Enabled: true
 

Library/Homebrew/dev-cmd/audit.rb

@@ -1246,6 +1246,7 @@ def initialize(resource, options = {})
 
   def audit
     audit_version
+    audit_checksum
     audit_download_strategy
     audit_urls
     self
@@ -1272,6 +1273,28 @@ def audit_version
     problem "version #{version} should not end with an underline and a number"
   end
 
+  def audit_checksum
+    return unless checksum
+
+    case checksum.hash_type
+    when :md5
+      problem "MD5 checksums are deprecated, please use SHA256"
+      return
+    when :sha1
+      problem "SHA1 checksums are deprecated, please use SHA256"
+      return
+    when :sha256 then len = 64
+    end
+
+    if checksum.empty?
+      problem "#{checksum.hash_type} is empty"
+    else
+      problem "#{checksum.hash_type} should be #{len} characters" unless checksum.hexdigest.length == len
+      problem "#{checksum.hash_type} contains invalid characters" unless checksum.hexdigest =~ /^[a-fA-F0-9]+$/
+      problem "#{checksum.hash_type} should be lowercase" unless checksum.hexdigest == checksum.hexdigest.downcase
+    end
+  end
+
   def audit_download_strategy
     if url =~ %r{^(cvs|bzr|hg|fossil)://} || url =~ %r{^(svn)\+http://}
       problem "Use of the #{$&} scheme is deprecated, pass `:using => :#{$1}` instead"

Library/Homebrew/rubocops.rb

@@ -5,4 +5,3 @@
 require_relative "./rubocops/homepage_cop"
 require_relative "./rubocops/text_cop"
 require_relative "./rubocops/caveats_cop"
-require_relative "./rubocops/checksum_cop"

Library/Homebrew/rubocops/extend/formula_cop.rb

@@ -167,18 +167,12 @@ def find_block(node, block_name)
         nil
       end
 
-      # Returns an array of block nodes of depth first order named block_name below node
+      # Returns an array of block nodes named block_name inside node
       def find_blocks(node, block_name)
         return if node.nil?
         node.each_child_node(:block).select { |block_node| block_name == block_node.method_name }
       end
 
-      # Returns an array of block nodes of any depth below node in AST
-      def find_all_blocks(node, block_name)
-        return if node.nil?
-        node.each_descendant(:block).select { |block_node| block_name == block_node.method_name }
-      end
-
       # Returns a method definition node with method_name
       def find_method_def(node, method_name)
         return if node.nil?
@@ -256,7 +250,8 @@ def caveats_strings
 
       # Returns the array of arguments of the method_node
       def parameters(method_node)
-        method_node.method_args if method_node.send_type? || method_node.block_type?
+        return unless method_node.send_type?
+        method_node.method_args
       end
 
       # Returns true if the given parameters are present in method call