feat: add jinja env with toml finalization

This will be used in the standard component library for loading
and rendering templated toml files.

pyromaniac/compiler/code/jinja.py

@@ -1,4 +1,5 @@
 from typing import Any
+from datetime import date, datetime, time
 from pathlib import PosixPath as Path
 from json import dumps as json_dumps, JSONEncoder as JSONEncoderBase
 from jinja2 import Environment
@@ -30,3 +31,34 @@ def json_finalize(obj: Any) -> str:
 
 json_env = Environment(finalize=json_finalize)
 json_env.filters['raw'] = lambda c: Raw(c)
+
+
+def toml(obj: Any) -> str:
+    match obj:
+        case dict():
+            pairs = []
+            for key, value in obj.items():
+                if not isinstance(key, str):
+                    raise ValueError(f"{repr(key)} is not a valid toml key")
+                pairs.append(f"{toml(key)} = {toml(value)}")
+            return "{ " + ", ".join(pairs) + " }"
+        case list():
+            return "[ " + ", ".join(toml(v) for v in obj) + " ]"
+        case date() | datetime() | time():
+            return obj.isoformat()
+        case str() | int() | float() | bool():
+            return json_dumps(obj)
+        case Path() | URL():
+            return toml(str(obj))
+        case _:
+            raise ValueError(f"{repr(obj)} is not toml serializable")
+
+
+def toml_finalize(obj: Any) -> str:
+    match obj:
+        case Raw(content): return str(content)
+        case _: return toml(obj)
+
+
+toml_env = Environment(finalize=toml_finalize)
+toml_env.filters['raw'] = lambda c: Raw(c)