Release Vulpes OS 2.7-preview.22

tools/prepare-language-fonts.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: MPL-2.0
+"""Regenerate bundled language-name fallback fonts from installed Noto fonts.
+
+Requires fonttools with WOFF2 support and Arch noto-fonts/noto-fonts-cjk.
+Normal builds use the bundled subsets and do not need these packages.
+"""
+from pathlib import Path
+import json,hashlib,shutil
+from fontTools.ttLib import TTFont
+from fontTools import subset
+root=Path(__file__).resolve().parents[1]
+out=root/'gaia/shared/elements/vulpes-fonts/languages';out.mkdir(exist_ok=True)
+labels=json.loads((root/'assets/webapps/settings.gaiamobile.org/shared/resources/languages.json').read_text())
+wanted=set(map(ord,''.join(labels.values())))
+fira=TTFont(out.parent/'FiraSans-Regular.otf');covered=set(fira.getBestCmap());missing=wanted-covered
+sources=['/usr/share/fonts/noto/NotoSans'+s+'-Regular.ttf' for s in ['Arabic','Bengali','Devanagari','Gurmukhi','Khmer']]+['/usr/share/fonts/noto-cjk/NotoSansCJK-Regular.ttc']
+css=['/* Native language names missing from Fira Sans. Subsets retain shaping tables. */']
+report=[]
+for source in sources:
+ p=Path(source);font=TTFont(p,fontNumber=0);chars=missing&set(font.getBestCmap())
+ if not chars:continue
+ name=p.stem.replace('NotoSans','VulpesLanguage');family=name+' Subset'
+ attrib={str(i):font['name'].getDebugName(i) for i in (0,5,13,14)}
+ opt=subset.Options();opt.flavor='woff2';opt.name_IDs=['*'];opt.name_legacy=True;opt.name_languages=['*']
+ sub=subset.Subsetter(options=opt);sub.populate(unicodes=chars);sub.subset(font)
+ for record in font['name'].names:
+  if record.nameID in (1,4,6,16):record.string=(family if record.nameID!=6 else name).encode(record.getEncoding())
+ font.flavor='woff2';target=out/(name+'.woff2');font.save(target)
+ css.append('@font-face {\n  font-family: FiraSans;\n  src: url("languages/'+target.name+'") format("woff2");\n  font-weight: 100 900;\n  font-style: normal;\n  font-display: swap;\n  unicode-range: '+','.join('U+%04X'%c for c in sorted(chars))+';\n}')
+ report.append({'file':target.name,'source':p.name,'sourceSha256':hashlib.sha256(p.read_bytes()).hexdigest(),'attribution':attrib,'unicode':sorted(chars)})
+ missing-=chars
+if missing:raise SystemExit('Uncovered label characters: '+str(missing))
+shutil.copy('/usr/share/licenses/noto-fonts-cjk/LICENSE',out/'LICENSE')
+(out/'provenance.json').write_text(json.dumps(report,ensure_ascii=False,indent=2)+'\n')
+p=out.parent/'fonts.css';text=p.read_text();start='\n/* Native language names missing from Fira Sans.'
+text=text.split(start)[0];p.write_text(text.rstrip()+'\n\n'+'\n\n'.join(css)+'\n')
+print(len(report),'fallback fonts,',sum(p.stat().st_size for p in out.glob('*.woff2')),'bytes')