Start of generating json manifest of macros in userPrefs.h (#4946)

* Start of generating json manifest for userPrefs.h

* Just trunk this for now

* Add automatic generation of json manifest in GH action

* Trunk

bin/build-userprefs-json.py

@@ -0,0 +1,48 @@
+import json
+import subprocess
+import re
+
+def get_macros_from_header(header_file):
+    # Run clang to preprocess the header file and capture the output
+    result = subprocess.run(['clang', '-E', '-dM', header_file], capture_output=True, text=True)
+    if result.returncode != 0:
+        raise RuntimeError(f"Clang preprocessing failed: {result.stderr}")
+
+    # Extract macros from the output
+    macros = {}
+    macro_pattern = re.compile(r'#define\s+(\w+)\s+(.*)')
+    for line in result.stdout.splitlines():
+        match = macro_pattern.match(line) 
+        if match and 'USERPREFS_' in line and '_USERPREFS_' not in line:
+            macros[match.group(1)] = match.group(2)
+
+    return macros
+
+def write_macros_to_json(macros, output_file):
+    with open(output_file, 'w') as f:
+        json.dump(macros, f, indent=4)
+
+def main():
+    header_file = 'userPrefs.h'
+    output_file = 'userPrefs.json'
+    # Uncomment all macros in the header file
+    with open(header_file, 'r') as file:
+        lines = file.readlines()
+
+    uncommented_lines = []
+    for line in lines:
+        stripped_line = line.strip().replace('/*', '').replace('*/', '')
+        if stripped_line.startswith('//') and 'USERPREFS_' in stripped_line:
+            # Replace "//"
+            stripped_line = stripped_line.replace('//', '')
+        uncommented_lines.append(stripped_line + '\n')
+
+    with open(header_file, 'w') as file:
+        for line in uncommented_lines:
+                file.write(line)
+    macros = get_macros_from_header(header_file)
+    write_macros_to_json(macros, output_file)
+    print(f"Macros have been written to {output_file}")
+
+if __name__ == "__main__":
+    main()