broke out Context into its own "config" module to avoid circular dependencies

src/dragonglass/config.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+
+from argparse import Namespace
+from pathlib import Path
+from typing import Any
+
+import yaml
+
+from .tree import SourceIndex, SourceNode
+
+
+class Context:
+    def __init__(self) -> None:
+        self.source_dir: Path | None = None
+        self.config: dict[str, Any] = {}
+        self.src_index: SourceIndex | None = None
+        self.current_node: SourceNode | None = None
+
+    def load_config(self, args: Namespace) -> None:
+        config_filename: str = str(args.config) if args.config else ".dragonglass"
+        assert self.source_dir is not None
+        config_path = self.source_dir / config_filename
+        if config_path.exists() and config_path.is_file():
+            with open(config_path, "r") as f:
+                self.config = yaml.full_load(f)
+
+    @property
+    def url_prefix(self) -> str:
+        rc = self.config.get("url_prefix", "/")
+        return rc if rc.endswith("/") else rc + '/'
+
+

src/dragonglass/dragonglass.py

@@ -2,12 +2,10 @@
 
 import argparse
 from pathlib import Path
-from typing import Any
-
-import yaml
 
+from .config import Context
 from .mparse import create_markdown_parser
-from .tree import SourceIndex, SourceNode, generate_list
+from .tree import SourceIndex, generate_list
 
 # The command line parser
 parser = argparse.ArgumentParser(prog='dragonglass')
@@ -16,27 +14,6 @@ parser.add_argument('dest_dir', help='Destination directory for the conversion.'
 parser.add_argument('-C', '--config', help='Specifies an alternate name for the configuration file.')
 
 
-class Context:
-    def __init__(self) -> None:
-        self.source_dir: Path | None = None
-        self.config: dict[str, Any] = {}
-        self.src_index: SourceIndex | None = None
-        self.current_node: SourceNode | None = None
-
-    def load_config(self, args: argparse.Namespace) -> None:
-        config_filename: str = str(args.config) if args.config else ".dragonglass"
-        assert self.source_dir is not None
-        config_path = self.source_dir / config_filename
-        if config_path.exists() and config_path.is_file():
-            with open(config_path, "r") as f:
-                self.config = yaml.full_load(f)
-
-    @property
-    def url_prefix(self) -> str:
-        rc = self.config.get("url_prefix", "/")
-        return rc if rc.endswith("/") else rc + '/'
-
-
 def main() -> int:
     args = parser.parse_args()
     context = Context()

src/dragonglass/mparse.py

@@ -1,4 +1,4 @@
-#/usr/bin/env python3
+#!/usr/bin/env python3
 
 import re
 import xml.etree.ElementTree as etree  # noqa: N813
@@ -11,7 +11,7 @@ from markdown.extensions import Extension
 from markdown.inlinepatterns import InlineProcessor, SimpleTagInlineProcessor
 from markdown.preprocessors import Preprocessor
 
-from .dragonglass import Context
+from .config import Context
 
 PRIO_BASE = 10000  # priority base for our extensions