feat(core): one set of rules for the components the importers create

packages/tilia-core/pyproject.toml

@@ -8,7 +8,7 @@ version = "0.0.2"
 description = "TiLiA's file format and corpus tools, without a user interface"
 readme = "README.md"
 requires-python = ">=3.10"
-dependencies = ["pypdf>=6.0.0"]
+dependencies = ["pypdf>=6.0.0", "webcolors>=24.8.0"]
 license = "GPL-3.0-or-later"
 license-files = ["LICENSE"]
 authors = [
@@ -17,6 +17,10 @@ authors = [
     {name = "Anne Foo"}
 ]
 
+[project.optional-dependencies]
+# Checking harmonies and keys, and later importing them, reads music21.
+harmony = ["music21>=9.1"]
+
 [project.scripts]
 tilia = "tilia_core.commands:main"
 

packages/tilia-core/src/tilia_core/importers/_commit.py

@@ -8,13 +8,10 @@
 from __future__ import annotations
 
 import random
-import string
 from collections.abc import Collection, Iterable
 from typing import Any
 
-from tilia_core import tla
-
-_ROW_ID_CHARACTERS = string.ascii_letters + string.digits
+from tilia_core import rules, tla
 
 
 def commit(
@@ -42,7 +39,7 @@ def commit(
 def new_row_id(taken: Collection[str]) -> str:
     """A range row's id: six letters and digits, none of `taken`, as TiLiA makes them."""
     while True:
-        row_id = "".join(random.choices(_ROW_ID_CHARACTERS, k=6))
+        row_id = "".join(random.choices(rules.ROW_ID_CHARACTERS, k=rules.ROW_ID_LENGTH))
         if row_id not in taken:
             return row_id