Start of 5etools utilities and library

Copying over the bestiary from dnd_monster_stats and working on a
similar SpellList object and Spell DB.

dnd5etools/scripts/argparse.py

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+import argparse
+import os
+import re
+import pathlib
+
+
+def build_argument_parser(description: str) -> argparse.ArgumentParser:
+    parser = argparse.ArgumentParser(description=description)
+    parser.add_argument(
+        "--data-dir",
+        "-d",
+        type=valid_directory,
+        required=True,
+        help="Data directory from 5etools",
+    )
+    parser.add_argument(
+        "--source-code",
+        "-s",
+        action="append",
+        metavar="CODE",
+        type=valid_source_code,
+        help="Filter data to just the given sources, may be provided multiple times",
+    )
+    return parser
+
+
+def valid_directory(path: str) -> pathlib.Path:
+    if os.path.isdir(path):
+        return pathlib.Path(os.path.realpath(path))
+    raise argparse.ArgumentTypeError(f"{path} is not a directory")
+
+
+def valid_source_code(code: str) -> str:
+    if re.match(r"^[A-Z]+$", code) is None:
+        raise argparse.ArgumentTypeError(f"{code} is not a valid data source code")
+    return code

dnd5etools/scripts/spell_templates.py

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+import pprint
+import dnd5etools.db.spells
+import dnd5etools.scripts.argparse
+
+
+def main():
+    args = dnd5etools.scripts.argparse.build_argument_parser(
+        "Summarizes spell templates",
+    ).parse_args()
+    db = dnd5etools.db.spells.SpellsDb(args.data_dir)
+    if args.source_code is None:
+        codes = list(db.db_index.source_index.keys())
+    else:
+        codes = args.source_code
+    for code in codes:
+        spell_list = db.get_spell_list(code)
+        pprint.pprint(spell_list.spells)