diff --git a/src/calibre/ebooks/txt/input.py b/src/calibre/ebooks/txt/input.py
index a0570c07ae..4ee07a08c4 100644
--- a/src/calibre/ebooks/txt/input.py
+++ b/src/calibre/ebooks/txt/input.py
@@ -62,7 +62,10 @@ class TXTInput(InputFormatPlugin):
except RuntimeError:
raise ValueError('This txt file has malformed markup, it cannot be'
' converted by calibre. See http://daringfireball.net/projects/markdown/syntax')
- else:
+ elif hasattr(options, 'flow_size') :
+ #Take care of possible split problems in epub output
+ html = convert_basic(txt, epub_split_size_kb = options.flow_size)
+ else :
html = convert_basic(txt)
from calibre.customize.ui import plugin_for_input_format
diff --git a/src/calibre/ebooks/txt/processor.py b/src/calibre/ebooks/txt/processor.py
index baebf2f298..cae715d6d6 100644
--- a/src/calibre/ebooks/txt/processor.py
+++ b/src/calibre/ebooks/txt/processor.py
@@ -17,13 +17,10 @@ __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)
@@ -33,6 +30,15 @@ def convert_basic(txt, title=''):
txt = re.sub('(?<=.)\s+$', '', txt)
# Remove excessive line breaks.
txt = re.sub('\n{3,}', '\n\n', txt)
+
+ #Takes care if there is no point to split
+ if ( epub_split_size_kb ) :
+ length_byte = len(txt.encode('utf-8'))
+ #Calculating the average chunk value for easy splitting as EPUB (+2 as a safe margin)
+ chunk_size = long(length_byte / (int(length_byte / (epub_split_size_kb * 1024) ) + 2 ))
+ #if there are chunks with a superior size then go and break
+ if (len(filter(lambda x: len(x.encode('utf-8')) > chunk_size, txt.split('\n\n')))) :
+ txt = '\n\n'.join([split_string_separator(line, chunk_size) for line in txt.split('\n\n')])
lines = []
# Split into paragraphs based on having a blank line between text.
@@ -50,8 +56,7 @@ def convert_markdown(txt, title='', disable_toc=False):
return HTML_TEMPLATE % (title, md.convert(txt))
def separate_paragraphs_single_line(txt):
- txt = txt.replace('\r\n', '\n')
- txt = txt.replace('\r', '\n')
+ txt = txt.replace('(\r\n|\r)', '\n')
txt = re.sub(u'(?<=.)\n(?=.)', u'\n\n', txt)
return txt
@@ -71,3 +76,8 @@ def opf_writer(path, opf_name, manifest, spine, mi):
with open(os.path.join(path, opf_name), 'wb') as opffile:
opf.render(opffile)
+def split_string_separator(txt, size) :
+ if ( len(txt.encode('utf-8')) > size ) :
+ txt = ''.join([ re.sub(u'\.(?P[^.]*)$', u'.\n\n\g', txt[i:i+size], 1) for i in xrange(0,len(txt.encode('utf-8')),size) ])
+ return txt
+