diff --git a/asymptome.lua b/asymptome.lua
index 6af0ae6..17fc1e6 100755
--- a/asymptome.lua
+++ b/asymptome.lua
@@ -1,5 +1,7 @@
 #!/usr/bin/env luajit
+local filters = require "lib.filters"
 local json = require "lib.dkjson"
+local sort_orders = require "lib.sort_orders"
 math.randomseed(os.time())
 
 local default_file = "books.json"
@@ -50,72 +52,6 @@ local get_random_order = function(array)
   return order
 end
 
-local filters = {
-  all_books = function(book)
-    if book.hidden then return false end
-    return true
-  end,
-  unread = function(book)
-    if book.hidden then return false end
-    if book.progress == 0 then
-      return true
-    end
-    return false
-  end,
-  read = function(book)
-    if book.hidden then return false end
-    if book.progress == 1 then
-      return true
-    end
-    return false
-  end,
-  in_progress = function(book)
-    if book.hidden then return false end
-    if book.progress > 0 and book.progress < 1 then
-      return true
-    end
-    return false
-  end,
-  exclude_series = function(book)
-    if book.hidden then return false end
-    if book.series and not (book.title or book.author) then
-      return false
-    end
-    return true
-  end,
-}
-
-local sort_orders
-sort_orders = {
-  most_progress = function(A, B)
-    return A.progress > B.progress
-  end,
-  least_progress = function(A, B)
-    return A.progress < B.progress
-  end,
-  highest_priority = function(A, B)
-    return A.priority > B.priority
-  end,
-  lowest_priority = function(A, B)
-    return A.priority < B.priority
-  end,
-  most_pages_remaining = function(A, B, data)
-    if not (A.pages and B.pages) then -- if pages is unknown for both, fallback to percentage
-      return A.progress < B.progress
-    end
-    local average_page_count = data.total_pages / data.books_with_page_count
-    if not (average_page_count == average_page_count) then
-      average_page_count = 300 -- based on average novel length
-    end
-    local a = (A.pages or average_page_count) - (A.pages or average_page_count) * A.progress
-    local b = (B.pages or average_page_count) - (B.pages or average_page_count) * B.progress
-    return a > b
-  end,
-  fewest_pages_remaining = function(A, B, data)
-    return not sort_orders.most_pages_remaining(A, B, data)
-  end,
-}
-
 local get_display_name = function(book)
   local result = ""
 
diff --git a/lib/filters.lua b/lib/filters.lua
new file mode 100644
index 0000000..108cccb
--- /dev/null
+++ b/lib/filters.lua
@@ -0,0 +1,36 @@
+local filters = {
+  all_books = function(book)
+    if book.hidden then return false end
+    return true
+  end,
+  unread = function(book)
+    if book.hidden then return false end
+    if book.progress == 0 then
+      return true
+    end
+    return false
+  end,
+  read = function(book)
+    if book.hidden then return false end
+    if book.progress == 1 then
+      return true
+    end
+    return false
+  end,
+  in_progress = function(book)
+    if book.hidden then return false end
+    if book.progress > 0 and book.progress < 1 then
+      return true
+    end
+    return false
+  end,
+  exclude_series = function(book)
+    if book.hidden then return false end
+    if book.series and not (book.title or book.author) then
+      return false
+    end
+    return true
+  end,
+}
+
+return filters
diff --git a/lib/sort_orders.lua b/lib/sort_orders.lua
new file mode 100644
index 0000000..36fb273
--- /dev/null
+++ b/lib/sort_orders.lua
@@ -0,0 +1,32 @@
+local sort_orders
+sort_orders = {
+  most_progress = function(A, B)
+    return A.progress > B.progress
+  end,
+  least_progress = function(A, B)
+    return A.progress < B.progress
+  end,
+  highest_priority = function(A, B)
+    return A.priority > B.priority
+  end,
+  lowest_priority = function(A, B)
+    return A.priority < B.priority
+  end,
+  most_pages_remaining = function(A, B, data)
+    if not (A.pages and B.pages) then -- if pages is unknown for both, fallback to percentage
+      return A.progress < B.progress
+    end
+    local average_page_count = data.total_pages / data.books_with_page_count
+    if not (average_page_count == average_page_count) then
+      average_page_count = 300 -- based on average novel length
+    end
+    local a = (A.pages or average_page_count) - (A.pages or average_page_count) * A.progress
+    local b = (B.pages or average_page_count) - (B.pages or average_page_count) * B.progress
+    return a > b
+  end,
+  fewest_pages_remaining = function(A, B, data)
+    return not sort_orders.most_pages_remaining(A, B, data)
+  end,
+}
+
+return sort_orders