Don't raise error for legit tmp files

This commit fixes an error when chaining multiple filters. Filters will
correctly put files inside the tmp directory. This commit verifies that
all files are not inside the tmp directory when input_files is
calculated. This will raise an error when you match files inside the
pipeline's tmp dir or specifically add it as an input

lib/rake-pipeline.rb

@@ -271,7 +271,11 @@ def input_files
 
         files.each do |file|
           relative_path = file.sub(%r{^#{Regexp.escape(expanded_root)}/}, '')
-          result << FileWrapper.new(expanded_root, relative_path)
+          wrapped_file = FileWrapper.new(expanded_root, relative_path)
+
+          raise TmpInputError, file if wrapped_file.in_directory?(tmpdir)
+
+          result << wrapped_file
         end
       end
 
@@ -344,12 +348,6 @@ def setup
     # @return [void]
     # @api private
     def setup_filters
-      # First verify that everything can actually be an input
-      # FIXME: define eligible_input_files to filter out tmpfile
-      eligible_input_files.each do |file|
-        raise TmpInputError, file.fullpath if file.in_directory? tmpdir
-      end
-
       last = @filters.last
 
       @filters.inject(eligible_input_files) do |current_inputs, filter|