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"""Helpers for theme-studio's captured Emacs default face snapshot."""
from __future__ import annotations
import json
import pathlib
from typing import Any
from face_specs import FACE_ATTRS
class DefaultFaces:
def __init__(self, data: dict[str, Any] | None):
self.data = data
self.color_hex = self._build_color_hex()
self.color_names = self._build_color_names()
@classmethod
def from_path(cls, path: str | pathlib.Path) -> "DefaultFaces":
path = pathlib.Path(path)
if not path.exists():
return cls(None)
return cls(json.loads(path.read_text()))
@property
def available(self) -> bool:
return bool(self.data)
def face(self, face: str, effective: bool = True) -> dict[str, Any]:
if not self.data:
return {}
data = self.data.get("faces", {}).get(face, {})
block = "effectiveGuiLight" if effective else "chosenGuiLight"
return data.get(block, {}) or {}
def color(self, face: str, attr: str = "foreground", effective: bool = True) -> Any:
data = self.face(face, effective)
return data.get(attr + "Hex") or data.get(attr)
def _seed_value(self, attr: dict[str, Any], data: dict[str, Any]) -> Any:
"""Turn a snapshot field into a model value per the attribute's kind.
The snapshot speaks a different dialect than the model: colors carry a
Hex variant with a name fallback; weight/slant are value-narrowed to the
legacy bold/italic until the snapshot refresh; underline/strike/overline
are truthy flags that become objects; inverse/extend coerce Emacs's "t".
Returns None (skip) when the attribute is unset or not seedable.
"""
kind, snap = attr["kind"], attr["snapshot"]
if not kind:
return None
if kind == "color":
return data.get(snap + "Hex") or data.get(snap)
if kind == "weight-bold":
return "bold" if data.get(snap) == "bold" else None
if kind == "slant-italic":
return "italic" if data.get(snap) == "italic" else None
if kind == "underline-obj":
return {"style": "line", "color": None} if data.get(snap) else None
if kind == "color-obj":
return {"color": None} if data.get(snap) else None
if kind == "bool":
return True if data.get(snap) in (True, "t") else None
if kind == "scalar":
return data.get(snap) or None
if kind == "height":
h = data.get(snap)
return h if (h and h != 1) else None
if kind == "box":
return self.box_to_theme(data.get(snap))
return None
def seed(self, face: str, effective: bool = False) -> dict[str, Any]:
data = self.face(face, effective)
out: dict[str, Any] = {}
for attr in FACE_ATTRS:
v = self._seed_value(attr, data)
if v:
out[attr["model"]] = v
return out
def box_to_theme(self, box: Any) -> dict[str, Any] | None:
if not box:
return None
if isinstance(box, dict):
return box
if not isinstance(box, list):
return None
vals = {}
i = 0
while i + 1 < len(box):
vals[box[i]] = box[i + 1]
i += 2
width = vals.get(":line-width", 1)
if isinstance(width, list) and width and width[0] == "cons":
width = width[1]
if isinstance(width, (int, float)):
width = abs(int(width)) or 1
else:
width = 1
color = vals.get(":color")
if color:
color = self.color_hex.get(str(color).lower().replace(" ", ""), color)
style = vals.get(":style")
if style == "released-button":
return {"style": "released", "width": width, "color": None}
if style == "pressed-button":
return {"style": "pressed", "width": width, "color": None}
return {"style": "line", "width": width, "color": color}
def label(self, value: str | None, fallback: str) -> str:
if not value:
return fallback
return self.color_names.get(str(value).lower(), fallback)
def summary(self) -> dict[str, Any]:
if not self.data:
return {}
inventory = self.data.get("package-inventory", {})
package_faces = sorted({face for faces in inventory.values() for face in faces})
package_inherits = {
face: self.seed(face).get("inherit")
for face in package_faces
if self.seed(face).get("inherit")
}
ui_faces = self.data.get("ui-faces", [])
return {
"emacsVersion": self.data.get("meta", {}).get("emacs-version"),
"default": {
"foreground": self.color("default", "foreground"),
"background": self.color("default", "background"),
},
"faceCount": len(self.data.get("faces", {})),
"packageFaceCount": len(package_faces),
"packageUnresolvedFaceCount": self.data.get("meta", {}).get("package-unresolved-face-count", 0),
"uiOwnSeeds": {face: self.seed(face) for face in ui_faces if self.seed(face)},
"packageInherits": package_inherits,
}
def _build_color_hex(self) -> dict[str, str]:
out: dict[str, str] = {}
if not self.data:
return out
for data in self.data.get("faces", {}).values():
for block in ("chosenGuiLight", "effectiveGuiLight"):
face_data = data.get(block, {}) or {}
for attr in ("foreground", "background", "distantForeground"):
name = face_data.get(attr)
hex_value = face_data.get(attr + "Hex")
if name and hex_value:
out[str(name).lower().replace(" ", "")] = hex_value
return out
def _build_color_names(self) -> dict[str, str]:
out: dict[str, str] = {}
if not self.data:
return out
for data in self.data.get("faces", {}).values():
for block in ("chosenGuiLight", "effectiveGuiLight"):
face_data = data.get(block, {}) or {}
for attr in ("foreground", "background", "distantForeground"):
hex_value = face_data.get(attr + "Hex")
name = face_data.get(attr)
if hex_value and name and not str(name).startswith("#"):
out.setdefault(hex_value.lower(), str(name).lower().replace(" ", "-"))
return out
def changed_summary(before: dict[str, Any], after: dict[str, Any]) -> dict[str, Any]:
changed = {}
for key in sorted(set(before) | set(after)):
if before.get(key) != after.get(key):
changed[key] = {"before": before.get(key), "after": after.get(key)}
return changed
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