Add Pry::Terminal.height! (only used once)

lib/pry/pager.rb

@@ -27,8 +27,7 @@ class Pry::Pager
   end
 
   def self.page_size
-    rows = Pry::Terminal.screen_size
-    @page_size ||= (rows && rows.first || 27)
+    @page_size ||= Pry::Terminal.height!
   end
 
   def initialize(text)

lib/pry/terminal.rb

@@ -13,15 +13,20 @@ class Pry::Terminal
     end
 
     # Return a screen size or a default if that fails.
-    def size! default = [25, 80]
+    def size! default = [27, 80]
       screen_size || default
     end
 
     # Return a screen width or the default if that fails.
-    def width! default = 80
+    def width!
       size![1]
     end
 
+    # Return a screen height or the default if that fails.
+    def height!
+      size![0]
+    end
+
     def actual_screen_size
       # The best way, if possible (requires non-jruby ≥1.9 or io-console gem)
       screen_size_according_to_io_console or