add format deregistration

Author: nschloe

src/meshio/__init__.py

@@ -34,6 +34,7 @@
 from .__about__ import __version__
 from ._exceptions import ReadError, WriteError
 from ._helpers import (
+    deregister_format,
     extension_to_filetypes,
     read,
     register_format,
@@ -77,6 +78,7 @@
     "read",
     "write",
     "register_format",
+    "deregister_format",
     "write_points_cells",
     "extension_to_filetypes",
     "Mesh",

src/meshio/_cli/_ascii.py

@@ -24,7 +24,6 @@ def ascii(args):
         fmts = [args.input_format]
     else:
         fmts = _filetypes_from_path(pathlib.Path(args.infile))
-
     # pick the first
     fmt = fmts[0]
 

src/meshio/_helpers.py

@@ -15,17 +15,29 @@
 _writer_map = {}
 
 
-def register_format(name: str, extensions: list[str], reader, writer_map):
+def register_format(format_name: str, extensions: list[str], reader, writer_map):
     for ext in extensions:
         if ext not in extension_to_filetypes:
             extension_to_filetypes[ext] = []
-        extension_to_filetypes[ext].append(name)
+        extension_to_filetypes[ext].append(format_name)
 
     if reader is not None:
-        reader_map[name] = reader
+        reader_map[format_name] = reader
     _writer_map.update(writer_map)
 
 
+def deregister_format(format_name: str):
+    for value in extension_to_filetypes.values():
+        if format_name in value:
+            value.remove(format_name)
+
+    if format_name in reader_map:
+        reader_map.pop(format_name)
+
+    if format_name in _writer_map:
+        _writer_map.pop(format_name)
+
+
 def _filetypes_from_path(path: Path) -> list[str]:
     ext = ""
     out = []