--- textwrap-existing.py	2006-10-20 09:14:00.000000000 +0200
+++ textwrap.py	2006-10-20 09:10:26.000000000 +0200
@@ -51,6 +52,8 @@
         Expand tabs in input text to spaces before further processing.
         Each tab will become 1 .. 8 spaces, depending on its position in
         its line.  If false, each tab is treated as a single character.
+      drop_whitespace (default: true)
+        Drop leading and trailing whitespace from lines.
       replace_whitespace (default: true)
         Replace all whitespace characters in the input text by spaces
         after tab expansion.  Note that if expand_tabs is false and
@@ -96,6 +99,7 @@
                  initial_indent="",
                  subsequent_indent="",
                  expand_tabs=True,
+                 drop_whitespace=True,
                  replace_whitespace=True,
                  fix_sentence_endings=False,
                  break_long_words=True):
@@ -103,6 +107,7 @@
         self.initial_indent = initial_indent
         self.subsequent_indent = subsequent_indent
         self.expand_tabs = expand_tabs
+        self.drop_whitespace = drop_whitespace
         self.replace_whitespace = replace_whitespace
         self.fix_sentence_endings = fix_sentence_endings
         self.break_long_words = break_long_words
@@ -228,7 +233,7 @@
 
             # First chunk on line is whitespace -- drop it, unless this
             # is the very beginning of the text (ie. no lines started yet).
-            if chunks[-1].strip() == '' and lines:
+            if self.drop_whitespace and chunks[-1].strip() == '' and lines:
                 del chunks[-1]
 
             while chunks:
@@ -249,7 +254,7 @@
                 self._handle_long_word(chunks, cur_line, cur_len, width)
 
             # If the last chunk on this line is all whitespace, drop it.
-            if cur_line and cur_line[-1].strip() == '':
+            if self.drop_whitespace and cur_line and cur_line[-1].strip() == '':
                 del cur_line[-1]
 
             # Convert current line back to a string and store it in list