Initial commit: certgen — сервис генерации сертификатов

certgen/fonts.py

@@ -0,0 +1,86 @@
+"""Поиск системных шрифтов (в т.ч. с кириллицей)."""
+from __future__ import annotations
+
+import subprocess
+from functools import lru_cache
+from pathlib import Path
+
+SEARCH_DIRS = [
+    Path(__file__).resolve().parent / "assets" / "fonts",  # шрифты, вложенные в проект
+    Path("/usr/share/fonts"),
+    Path("/usr/local/share/fonts"),
+    Path.home() / ".local/share/fonts",
+    Path("/Library/Fonts"),
+    Path("/System/Library/Fonts"),
+    Path("C:/Windows/Fonts"),
+]
+
+ALIASES = {
+    "serif": "DejaVuSerif",
+    "serif-bold": "DejaVuSerif-Bold",
+    "serif-italic": "DejaVuSerif-Italic",
+    "serif-bolditalic": "DejaVuSerif-BoldItalic",
+    "sans": "DejaVuSans",
+    "sans-bold": "DejaVuSans-Bold",
+    "sans-italic": "DejaVuSans-Oblique",
+    "sans-bolditalic": "DejaVuSans-BoldOblique",
+    "mono": "DejaVuSansMono",
+}
+
+
+@lru_cache(maxsize=1)
+def _index() -> dict[str, str]:
+    idx: dict[str, str] = {}
+    for d in SEARCH_DIRS:
+        if not d.exists():
+            continue
+        for f in d.rglob("*"):
+            if f.suffix.lower() in (".ttf", ".otf", ".ttc"):
+                idx.setdefault(f.stem.lower(), str(f))
+                idx.setdefault(f.name.lower(), str(f))
+    return idx
+
+
+def _fallback() -> str:
+    idx = _index()
+    for key in ("dejavusans", "dejavuserif", "liberationsans", "notosans",
+                "arial", "arialunicode"):
+        if key in idx:
+            return idx[key]
+    return next(iter(idx.values()), "")
+
+
+@lru_cache(maxsize=256)
+def find_font(name: str | None) -> str:
+    """Вернуть путь к файлу шрифта по имени или алиасу."""
+    name = (name or "sans").strip()
+    p = Path(name)
+    if p.is_absolute() and p.exists():
+        return str(p)
+
+    key = ALIASES.get(name.lower(), name).lower()
+    idx = _index()
+
+    if key in idx:
+        return idx[key]
+    if key + ".ttf" in idx:
+        return idx[key + ".ttf"]
+
+    # частичное совпадение
+    matches = [v for k, v in idx.items() if key in k]
+    if matches:
+        return matches[0]
+
+    # спросим fontconfig
+    try:
+        out = subprocess.run(
+            ["fc-match", "-f", "%{file}", name],
+            capture_output=True, text=True, timeout=10,
+        )
+        path = out.stdout.strip()
+        if path and Path(path).exists():
+            return path
+    except Exception:
+        pass
+
+    return _fallback()