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docs/modules/core.transforms.md

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+# `src/core/transforms.py`
+
+Tag-schema value transforms for miniDLNA folder names.
+
+Applied when building a folder name from a tag value — the tag keeps its exact
+value (e.g. rating 87 → tag "Hodnocení/87"), while the folder groups it
+(→ "…/80–89 %"). Config-driven and extensible via `TAG_TRANSFORMS`.
+
+Source: [`src/core/transforms.py`](../../src/core/transforms.py)
+
+## Functions
+
+### `rating_band`
+
+*function · line 11*
+
+```python
+rating_band(rating: int) -> str
+```
+
+Bucket a 0–100 rating into a ten-point band label (e.g. "80–89 %").
+
+The top bucket spans 90–100 % so a perfect 100 still lands in a band.
+
+### `_decade_band`
+
+*function · line 21*
+
+```python
+_decade_band(value) -> str
+```
+
+`decade_band` transform: pull the leading integer and bucket it.
+
+### `apply_transform`
+
+*function · line 35*
+
+```python
+apply_transform(value: str, transform: Optional[str]) -> str
+```
+
+Apply a named tag-schema transform to a value, returning a string.