csvclean: Use stdin_out.csv instead of <stdin>_out.csv, closes #456

CHANGELOG

@@ -32,6 +32,7 @@ Fixes:
 * in2csv correctly interprets --no-inference.
 * in2csv again supports nested JSON objects (fixes regression).
 * in2csv --format geojson will print a JSON object instead of `OrderedDict([(...)])`.
+* csvclean with standard input works on Windows.
 * csvgrep returns the input file's line numbers if the --linenumbers flag is set.
 * csvgrep can match multiline values.
 * csvsql correctly escapes `%` characters in SQL queries.

csvkit/utilities/csvclean.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import sys
 from os.path import splitext
 
 import agate
@@ -34,7 +35,10 @@ def main(self):
             if checker.joins:
                 self.output_file.write('%i rows would have been joined/reduced to %i rows after eliminating expected internal line breaks.\n' % (checker.rows_joined, checker.joins))
         else:
-            base, ext = splitext(self.input_file.name)
+            if self.input_file == sys.stdin:
+                base = 'stdin'  # "<stdin>_out.csv" is invalid on Windows
+            else:
+                base = splitext(self.input_file.name)[0]
 
             with open('%s_out.csv' % base, 'w') as f:
                 clean_writer = agate.writer(f, **self.writer_kwargs)