refactor continue reading into Library class

src/routes/main.cr

@@ -65,51 +65,8 @@ class MainRouter < Router
 
     get "/" do |env|
       begin
-        titles = @context.library.titles
         username = get_username env
-
-        # map: get the on-deck entry or nil for each Title
-        # select: select only entries (and ignore Nil's) from the array
-        #   produced by map
-        continue_reading_entries = titles.map { |t|
-          t.get_continue_reading_entry username
-        }.select Entry
-
-        percentage = continue_reading_entries.map { |e|
-          e.book.load_percentage username, e.title
-        }
-
-        last_read = continue_reading_entries.map { |e|
-          e.book.get_last_read_for_continue_reading username, e
-        }
-
-        # Group values in a NamedTuple for easier sorting
-        cr_entries = continue_reading_entries.map_with_index { |e, i|
-          {
-            entry: e,
-            percentage: percentage[i],
-            # if you're ok with the NamedTuple approach we could remove the
-            # percentage and last_read vars above and just call the methods 
-            # here eg.
-            # perecentage: e.book.load_percentage username, e.title
-            last_read: last_read[i]
-          }
-        }
-        # I couldn't get the sort to work where last_read type is `Time | Nil`
-        # so I'm creating a new variable with just the entries that have last_read
-        # even still, I have to do another workaround within the sort below :/
-        cr_entries_not_nil = cr_entries.select { |e| e[:last_read] }
-        cr_entries_not_nil.sort! { |a, b| 
-          # 'if' ensures values aren't nil otherwise the compiler errors
-          # because it still thinks the NamedTuple `last_read` can be nil
-          # even though we only 'select'ed the objects which have last_read
-          # there's probably a better way to do this
-          if (a_time = a[:last_read]) && (b_time = b[:last_read])
-            b_time <=> a_time
-          end
-        }
-        # add `last_read == nil` entries AFTER sorted entries
-        continue_reading = cr_entries_not_nil + cr_entries.select { |e| e[:last_read].nil? }
+        continue_reading = @context.library.get_continue_reading_entries username
 
         layout "home"
       rescue e