reverse pdfmanipulate command

src/calibre/ebooks/pdf/manipulate.py

@@ -10,11 +10,12 @@ __docformat__ = 'restructuredtext en'
 import string, sys
 
 from calibre.utils.config import Config, StringConfig
-from calibre.ebooks.pdf import info, merge, split, trim
+from calibre.ebooks.pdf import info, merge, reverse, split, trim
 
 COMMANDS = {
              'info'    : info,
              'merge'   : merge,
+             'reverse' : reverse,
              'split'   : split,
              'trim'    : trim,
            }

src/calibre/ebooks/pdf/reverse.py

@@ -0,0 +1,88 @@
+# -*- coding: utf-8 -*-
+from __future__ import with_statement
+
+__license__   = 'GPL v3'
+__copyright__ = '2009, John Schember <john@nachtimwald.com>'
+__docformat__ = 'restructuredtext en'
+
+'''
+Reverse content of PDF.
+'''
+
+import os, sys
+
+from calibre.ebooks.metadata.meta import metadata_from_formats
+from calibre.ebooks.metadata import authors_to_string
+from calibre.utils.config import Config, StringConfig
+
+from pyPdf import PdfFileWriter, PdfFileReader
+
+def config(defaults=None):
+    desc = _('Options to control the transformation of pdf')
+    if defaults is None:
+        c = Config('reversepdf', desc)
+    else:
+        c = StringConfig(defaults, desc)
+    c.add_opt('output', ['-o', '--output'], default='reversed.pdf',
+          help=_('Path to output file. By default a file is created in the current directory.'))
+    return c
+
+def option_parser(name):
+    c = config()
+    return c.option_parser(usage=_('''\
+	%prog %%name [options] file1.pdf
+
+	Reverse PDF.
+	'''.replace('%%name', name)))
+
+def reverse(pdf_path, out_path, metadata=None):
+    if metadata == None:
+        title = _('Unknown')
+        author = _('Unknown')
+    else:
+        title = metadata.title
+        author = authors_to_string(metadata.authors)
+
+    out_pdf = PdfFileWriter(title=title, author=author)
+
+    pdf = PdfFileReader(open(os.path.abspath(pdf_path), 'rb'))
+    for page in reversed(pdf.pages):
+        out_pdf.addPage(page)
+
+    with open(out_path, 'wb') as out_file:
+        out_pdf.write(out_file)
+
+# Return True if the pdf is valid.
+def valid_pdf(pdf_path):
+    try:
+        with open(os.path.abspath(pdf_path), 'rb') as pdf_file:
+            pdf = PdfFileReader(pdf_file)
+            if pdf.isEncrypted or pdf.numPages <= 0:
+                raise Exception
+    except:
+        return False
+    return True
+
+
+def main(args=sys.argv, name=''):
+    parser = option_parser(name)
+    opts, args = parser.parse_args(args)
+    args = args[1:]
+    
+    if len(args) < 1:
+        print 'Error: A PDF file is required.\n\n'
+        print parser.get_usage()
+        return 2
+    
+    if not valid_pdf(args[0]):
+        print 'Error: Could not read file `%s`. Is it a vaild PDF file or is it encrypted/DRMed?.' % args[0]
+        return 2
+    
+    mi = metadata_from_formats([args[0]])
+
+    reverse(args[0], opts.output, mi)
+
+    return 0
+
+if __name__ == '__main__':
+    sys.exit(main())