Add config option for continuous scroll behavior

Add config option for continuous scroll behavior

Add continuous scroll option to default config

lib/sup.rb

@@ -332,7 +332,8 @@ def load_config filename
       :slip_rows => 0,
       :col_jump => 2,
       :stem_language => "english",
-      :sync_back_to_maildir => false
+      :sync_back_to_maildir => false,
+      :continuous_scroll => false
     }
     if File.exists? filename
       config = Redwood::load_yaml_obj filename

lib/sup/modes/line_cursor_mode.rb

@@ -94,7 +94,7 @@ def cursor_down
     call_load_more_callbacks buffer.content_height if @curpos >= lines - [buffer.content_height/2,1].max
     return false unless @curpos < lines - 1
 
-    if @curpos == botline - 3
+    if @curpos == botline - 3 and $config[:continuous_scroll]
       # load more lines, one at a time.
       jump_to_line topline + 1
       @curpos += 1
@@ -104,6 +104,9 @@ def cursor_down
         set_status
         buffer.commit
       end
+    elsif @curpos >= botline - 1
+      page_down
+      set_cursor_pos topline
     else
       @curpos += 1
       unless buffer.dirty?
@@ -118,7 +121,8 @@ def cursor_down
 
   def cursor_up
     return false unless @curpos > @cursor_top
-    if @curpos == topline + 3
+
+    if @curpos == topline + 3 and $config[:continuous_scroll]
       jump_to_line topline - 1
       @curpos -= 1
       unless buffer.dirty?
@@ -127,6 +131,10 @@ def cursor_up
         set_status
         buffer.commit
       end
+    elsif @curpos == topline
+      old_topline = topline
+      page_up
+      set_cursor_pos [old_topline - 1, topline].max
     else
       @curpos -= 1
       unless buffer.dirty?
@@ -192,5 +200,4 @@ def call_load_more_callbacks size
     @load_more_q.push size if $config[:load_more_threads_when_scrolling]
   end
 end
-
 end