preliminary support for writing configs direct to JSON

I'm hoping this will allow for editing the JSON configs directly with
edit-config

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

gp2040ce_bintools/builder.py

@@ -10,6 +10,7 @@ import os
 import re
 from typing import Optional
 
+from google.protobuf.json_format import MessageToJson
 from google.protobuf.message import Message
 
 import gp2040ce_bintools.storage as storage
@@ -247,6 +248,10 @@ def write_new_config_to_filename(config: Message, filename: str, inject: bool =
         binary = replace_config_in_binary(bytearray(existing_binary), config_binary)
         with open(filename, 'wb') as file:
             file.write(binary)
+    else:
+        if filename[-5:] == '.json':
+            with open(filename, 'w') as file:
+                file.write(MessageToJson(config))
         else:
             binary = storage.serialize_config_with_footer(config)
             with open(filename, 'wb') as file:

tests/test_builder.py

@@ -3,6 +3,7 @@
 SPDX-FileCopyrightText: © 2023 Brian S. Stephan <bss@incorporeal.org>
 SPDX-License-Identifier: GPL-3.0-or-later
 """
+import logging
 import math
 import os
 import sys
@@ -14,10 +15,12 @@ from decorator import decorator
 import gp2040ce_bintools.builder as builder
 from gp2040ce_bintools import get_config_pb2
 from gp2040ce_bintools.storage import (STORAGE_SIZE, get_board_storage_section, get_config, get_config_footer,
-                                       get_user_storage_section, serialize_config_with_footer)
+                                       get_config_from_json, get_user_storage_section, serialize_config_with_footer)
 
 HERE = os.path.dirname(os.path.abspath(__file__))
 
+logger = logging.getLogger(__name__)
+
 
 @decorator
 def with_pb2s(test, *args, **kwargs):
@@ -351,6 +354,21 @@ def test_write_new_config_to_config_uf2(firmware_binary, tmp_path):
     assert len(config_dump) == STORAGE_SIZE * 2
 
 
+@with_pb2s
+def test_write_new_config_to_config_json(config_binary, tmp_path):
+    """Test that the config can be written to a file."""
+    tmp_file = os.path.join(tmp_path, 'config.json')
+    config = get_config(config_binary)
+    builder.write_new_config_to_filename(config, tmp_file)
+
+    # read new file
+    with open(tmp_file, 'r') as file:
+        config_dump = file.read()
+    logger.debug(config_dump)
+    config = get_config_from_json(config_dump)
+    assert config.boardVersion == 'v0.7.5'
+
+
 @with_pb2s
 def test_write_new_config_to_usb(config_binary):
     """Test that the config can be written to USB at the proper alignment."""