default_pfx: Filter out fully qualified paths from the registry.

The default registry contains some fully qualified paths to fonts
that are available on the build machine, but make no sense on any
other system. This is useless, and also known to cause bug, because
it confuses the Wine font caching code. An affected game is
Lumberjack's Dynasty.

default_pfx.py

@@ -6,6 +6,7 @@
 
 import os
 import subprocess
+import re
 
 def file_is_wine_builtin_dll(path):
     if not os.path.exists(path):
@@ -71,6 +72,43 @@ def setup_dll_symlinks(default_pfx_dir, dist_dir):
                 os.unlink(filename)
                 make_relative_symlink(target, filename)
 
+KEY_RE = re.compile(r'\[(.+)\] ([0-9]+)')
+VALUE_RE = re.compile(r'"(.*)"="(.+)"')
+
+def filter_registry(filename):
+    """Remove registry values that contain a fully qualified path
+    inside some well-known registry keys. These paths are devised on
+    the build machine and it makes no sense to distribute them. Plus,
+    they are known to cause bugs."""
+
+    FILTER_KEYS = [
+        r'Software\\Microsoft\\Windows\\CurrentVersion\\Fonts',
+        r'Software\\Microsoft\\Windows NT\\CurrentVersion\\Fonts',
+        r'Software\\Wine\\Fonts\\External Fonts',
+    ]
+
+    filtering = False
+    with open(filename) as fin:
+        with open(filename + '.tmp', 'w') as fout:
+            for line in fin:
+                line = line.strip()
+
+                match = KEY_RE.match(line)
+                if match is not None:
+                    fout.write(line + '\n')
+                    filtering = match.group(1) in FILTER_KEYS
+                    continue
+
+                match = VALUE_RE.match(line)
+                if match is not None:
+                    if not filtering or match.group(2)[1:2] != ':':
+                        fout.write(line + '\n')
+                    continue
+
+                fout.write(line + '\n')
+
+    os.rename(filename + '.tmp', filename)
+
 def make_default_pfx(default_pfx_dir, dist_dir, runtime):
     local_env = dict(os.environ)
 
@@ -95,6 +133,9 @@ def make_default_pfx(default_pfx_dir, dist_dir, runtime):
         env=local_env, check=True)
     setup_dll_symlinks(default_pfx_dir, dist_dir)
 
+    filter_registry(os.path.join(default_pfx_dir, 'user.reg'))
+    filter_registry(os.path.join(default_pfx_dir, 'system.reg'))
+
 if __name__ == '__main__':
     import sys
     if len(sys.argv) > 3: