From 1395c6d5d814349102d23d9cdfb26af8689b4bb0 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 24 May 2011 15:48:27 -0600
Subject: [PATCH] EPUB Output: Change any white-space:pre declarations in the
 CSS to pre-wrap to accomodate readers that cannot scroll horizontally. Fixes
 #786722 (chm to epub conversion fails to reflow text in <pre> tag)

---
 src/calibre/ebooks/epub/output.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/calibre/ebooks/epub/output.py b/src/calibre/ebooks/epub/output.py
index 0ed6d7e222..bea90eeba8 100644
--- a/src/calibre/ebooks/epub/output.py
+++ b/src/calibre/ebooks/epub/output.py
@@ -413,6 +413,13 @@ class EPUBOutput(OutputFormatPlugin):
                             rule.style.removeProperty('margin-left')
                             # padding-left breaks rendering in webkit and gecko
                             rule.style.removeProperty('padding-left')
+                # Change whitespace:pre to pre-line to accommodate readers that
+                # cannot scroll horizontally
+                for rule in stylesheet.data.cssRules.rulesOfType(CSSRule.STYLE_RULE):
+                    style = rule.style
+                    ws = style.getPropertyValue('white-space')
+                    if ws == 'pre':
+                        style.setProperty('white-space', 'pre-wrap')
 
     # }}}