normalize filepaths

This should fix inconsistent forward/backward slash sourceinfo.

I'd be intrigued to find out what causes this inconsistency in the first
place, though.
It might have something to do with the pathlib migration, i.e. a fork
change. Since I added the `replace("\\\\", "\\")` myself, I'd presume
that it used to work upstream.

src/ctypesgen/printer_json.py

@@ -1,4 +1,5 @@
 import json
+from pathlib import Path
 from ctypesgen.ctypedescs import CtypesBitfield
 
 
@@ -48,6 +49,7 @@ def __init__(self, outpath, options, data, argv):
 
         res = []
         for kind, desc in data:
+            desc.src = (str(Path(desc.src[0]).as_posix()), *desc.src[1:])
             item = method_table[kind](desc)
             if item: res.append(item)
         with outpath.open("w", encoding="utf-8") as fh:

src/ctypesgen/printer_python.py

@@ -79,7 +79,7 @@ def __init__(self, outpath, opts, data, argv):
     @classmethod
     def _txtpath(cls, s):
         # Returns a path string suitable for embedding into the output, with private paths stripped
-        s = str(s)
+        s = str( Path(s).as_posix() )
         for p, x in cls.PRIVATE_PATHS_TABLE:
             if s.startswith(p):
                 return x + s[len(p):]

tests/json_expects.py

@@ -49,10 +49,7 @@ def _replace_anon_tag(self, json, tag, new_tag):
                     if value == tag:
                         json[key] = new_tag
                 elif key == "src" and isinstance(value, list) and value:
-                    # for whatever reason, on windows ctypesgen's json output contains double slashes in paths, whereas the expectation contains only single slashes, so normalize the output
-                    if sys.platform == "win32":
-                        value[0] = value[0].replace("\\\\", "\\")
-                    # # ignore the line number so changing headers does not cause erroneous test fails
+                    # ignore the line number so changing headers does not cause erroneous test fails
                     value[1] = None
                 else:
                     self._replace_anon_tag(value, tag, new_tag)