Clean pod2man-generated manpages after formula build

Library/Homebrew/build.rb

@@ -185,6 +185,8 @@ def install
             # Find and link metafiles
             formula.prefix.install_metafiles formula.buildpath
             formula.prefix.install_metafiles formula.libexec if formula.libexec.exist?
+
+            normalize_pod2man_outputs!(formula)
           end
         end
       end
@@ -214,6 +216,11 @@ def fixopt(formula)
   rescue
     raise "#{formula.opt_prefix} not present or broken\nPlease reinstall #{formula.full_name}. Sorry :("
   end
+
+  def normalize_pod2man_outputs!(formula)
+    keg = Keg.new(formula.prefix)
+    keg.normalize_pod2man_outputs!
+  end
 end
 
 begin

Library/Homebrew/keg.rb

@@ -554,6 +554,31 @@
     path.find { |pn| FileUtils.rm_rf pn if pn.basename.to_s == "__pycache__" }
   end
 
+  def normalize_pod2man_outputs!
+    manpages = Dir[path/"share/man/*/*"]
+    generated_regex = /^\.\\"\s*Automatically generated by .*\n/
+    manpages.each do |f|
+      manpage = Pathname.new(f)
+      next unless manpage.file?
+
+      content = manpage.read
+      content = content.gsub(generated_regex, "")
+      content = content.lines.map do |line|
+        next line unless line.start_with?(".TH")
+
+        # Split the line by spaces, but preserve quoted strings
+        parts = line.split(/\s(?=(?:[^"]|"[^"]*")*$)/)
+        next line if parts.length != 6
+
+        # pod2man embeds the perl version used into the 5th field of the footer
+        T.must(parts[4]).gsub!(/^"perl v.*"$/, "\"\"")
+        "#{parts.join(" ")}\n"
+      end.join
+
+      manpage.atomic_write(content)
+    end
+  end
+
   def binary_executable_or_library_files
     []
   end