Downloaded from http://benhoskin.gs/2009/11/25/multi-line-prompts-in-fish/

--- fish-1.23.1/reader.c
+++ fish-1.23.1/reader.c
@@ -698,6 +698,10 @@
 	for( i=0; i<al_get_count( &prompt_list); i++ )
 	{
 		sb_append( &data->prompt_buff, (wchar_t *)al_get( &prompt_list, i ) );
+        if (i + 1 < al_get_count( &prompt_list))
+        {
+            sb_append( &data->prompt_buff, L"\n" );
+        }
 	}
 	
 	al_foreach( &prompt_list, &free );