diff --git a/src/calibre/ebooks/txt/input.py b/src/calibre/ebooks/txt/input.py
index a0570c07ae..cce7bea519 100644
--- a/src/calibre/ebooks/txt/input.py
+++ b/src/calibre/ebooks/txt/input.py
@@ -63,7 +63,8 @@ class TXTInput(InputFormatPlugin):
raise ValueError('This txt file has malformed markup, it cannot be'
' converted by calibre. See http://daringfireball.net/projects/markdown/syntax')
else:
- html = convert_basic(txt)
+ flow_size = getattr(options, 'flow_size', 0)
+ html = convert_basic(txt, epub_split_size_kb=flow_size)
from calibre.customize.ui import plugin_for_input_format
html_input = plugin_for_input_format('html')
diff --git a/src/calibre/ebooks/txt/processor.py b/src/calibre/ebooks/txt/processor.py
index baebf2f298..c53d630ed6 100644
--- a/src/calibre/ebooks/txt/processor.py
+++ b/src/calibre/ebooks/txt/processor.py
@@ -17,14 +17,11 @@ __docformat__ = 'restructuredtext en'
HTML_TEMPLATE = u'%s\n%s\n'
-def convert_basic(txt, title=''):
- lines = []
+def convert_basic(txt, title='', epub_split_size_kb=0):
# Strip whitespace from the beginning and end of the line. Also replace
# all line breaks with \n.
- for line in txt.splitlines():
- lines.append(line.strip())
- txt = '\n'.join(lines)
-
+ txt = '\n'.join([line.strip() for line in txt.splitlines()])
+
# Condense redundant spaces
txt = re.sub('[ ]{2,}', ' ', txt)
@@ -34,6 +31,15 @@ def convert_basic(txt, title=''):
# Remove excessive line breaks.
txt = re.sub('\n{3,}', '\n\n', txt)
+ #Takes care if there is no point to split
+ if epub_split_size_kb > 0:
+ length_byte = len(txt.encode('utf-8'))
+ #Calculating the average chunk value for easy splitting as EPUB (+2 as a safe margin)
+ chunk_size = long(length_byte / (int(length_byte / (epub_split_size_kb * 1024) ) + 2 ))
+ #if there are chunks with a superior size then go and break
+ if (len(filter(lambda x: len(x.encode('utf-8')) > chunk_size, txt.split('\n\n')))) :
+ txt = u'\n\n'.join([split_string_separator(line, chunk_size) for line in txt.split('\n\n')])
+
lines = []
# Split into paragraphs based on having a blank line between text.
for line in txt.split('\n\n'):
@@ -71,3 +77,10 @@ def opf_writer(path, opf_name, manifest, spine, mi):
with open(os.path.join(path, opf_name), 'wb') as opffile:
opf.render(opffile)
+def split_string_separator(txt, size) :
+ if len(txt.encode('utf-8')) > size:
+ txt = u''.join([re.sub(u'\.(?P[^.]*)$', u'.\n\n\g',
+ txt[i:i+size], 1) for i in
+ xrange(0, len(txt.encode('utf-8')), size)])
+ return txt
+