json: Replaced json results processor with a more comprehensive one

wlauto/utils/misc.py

@@ -815,3 +815,27 @@ def sha256(path, chunk=2048):
 
 def urljoin(*parts):
     return '/'.join(p.rstrip('/') for p in parts)
+
+
+# From: http://eli.thegreenplace.net/2011/10/19/perls-guess-if-file-is-text-or-binary-implemented-in-python/
+def istextfile(fileobj, blocksize=512):
+    """ Uses heuristics to guess whether the given file is text or binary,
+        by reading a single block of bytes from the file.
+        If more than 30% of the chars in the block are non-text, or there
+        are NUL ('\x00') bytes in the block, assume this is a binary file.
+    """
+    _text_characters = (b''.join(chr(i) for i in range(32, 127)) +
+                        b'\n\r\t\f\b')
+
+    block = fileobj.read(blocksize)
+    if b'\x00' in block:
+        # Files with null bytes are binary
+        return False
+    elif not block:
+        # An empty file is considered a valid text file
+        return True
+
+    # Use translate's 'deletechars' argument to efficiently remove all
+    # occurrences of _text_characters from the block
+    nontext = block.translate(None, _text_characters)
+    return float(len(nontext)) / len(block) <= 0.30