Modified the "pdfparanoia" script in bin/ so it uses Argparse and the "with" context statement.

As python 2.6 was already commented as a potential environment, there seemed little
reason to not use Argparse rather than a sys.argv popping system; argparse offers
automatically generated usage documentation and can offer useful errors when input
is incorrect.

The "with" context statement is also highly excellent and should be used wherever
legacy support for old-timers using 2.6 is not needed.

README.md

@@ -16,6 +16,9 @@ or,
 sudo python setup.py install
 ```
 
+pdfparanoia is written for python2.7+ or python 3.
+You will also need to manually install "pdfminer" if you do not use pip to install pdfparanoia.
+
 ## Usage
 
 ``` python
@@ -23,15 +26,14 @@ import pdfparanoia
 
 pdf = pdfparanoia.scrub(open("nmat91417.pdf", "rb"))
 
-file_handler = open("output.pdf", "wb")
+with open("output.pdf", "wb") as file_handler:
     file_handler.write(pdf)
-file_handler.close()
 ```
 
 or from the shell,
 
 ``` bash
-pdfparanoia --verbose input.pdf > output.pdf
+pdfparanoia --verbose input.pdf -o output.pdf
 ```
 
 and,

bin/pdfparanoia

@@ -10,28 +10,27 @@ stdin/piping or by referencing a file in argv[0].
 
 if __name__ == "__main__":
     import sys
-    import fileinput
+    import pdfparanoia
+    import argparse
     from StringIO import StringIO
 
+    ArgP = argparse.ArgumentParser(description="pdfparanoia is a PDF watermark removal library for academic papers. Some publishers include private information like institution names, personal names, ip addresses, timestamps and other identifying information in watermarks on each page.")
+    ArgP.add_argument('in_pdf', nargs='?', type=argparse.FileType('rb'),
+                        default=sys.stdin)
+    ArgP.add_argument("-o", "--output", type=argparse.FileType('wb'),
+                        default=sys.stdout)
+    ArgP.add_argument("-v", "--verbose", action="store_true", default=False,
+                      help="Output more information, which may be sensitive or excessive.")
+    ArgP.add_argument("-V", "--more-verbose", action="store_true", default=False,
+                      help="Output even more information. Implies -v.")
+    Args = ArgP.parse_args()
+
     verbose = 0
-    while '--verbose' in sys.argv:
-        verbose += 1
-        sys.argv.pop(sys.argv.index('--verbose'))
-
-    while '-v' in sys.argv:
-        verbose += 1
-        sys.argv.pop(sys.argv.index('-v'))
-
-    import pdfparanoia
-
-    # read in all lines
-    content = ""
-    for line in fileinput.input():
-        content += line
-
-    # scrub the pdf to get rid of watermarks
-    output = pdfparanoia.scrub(StringIO(content), verbose=verbose)
-
-    # dump to output
-    sys.stdout.write(output)
+    if Args.verbose: verbose = 1
+    if Args.more_verbose: verbose = 2
 
+    outputcontent = pdfparanoia.scrub(Args.in_pdf, verbose=verbose)
+    Args.in_pdf.close()
+    Args.output.write(outputcontent)
+    if Args.output != sys.stdout:
+        Args.output.close()

setup.py

@@ -31,7 +31,7 @@ setup(
         "License :: OSI Approved :: BSD License",
         "Operating System :: OS Independent",
         "Programming Language :: Python",
-        #"Programming Language :: Python :: 2.6",
+        # Uses argparse and with statement; 2.7+
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.1",