[ricardofrantz]

Adds machine-made Heddle 0.1, the third family. It is a Swiss display grotesk built from the approved sketch. Its integration mirrors Weft.

Renamed from "Shuttle" before the release, because "Shuttle" (Volcano Type) and "Shuttleblock" (Fort Foundry) clash. No typeface named Heddle was found (see heddle/BRIEF.md).

What is in it

• heddle/loom/: a Python port of the sketch engine (heddle/reference/heddle-sketch-0.1.js). It uses four primitives: rect, superellipse ring (n = 2.6), parallelogram and V.
  • A cut ring is built from pieces. Each piece is an outer and an inner superellipse arc between the cut levels, one cubic per quarter.
  • A cut works on one ring only and never erases another primitive.
• 12 point-compatible masters: wght 100, 400, 700, 900 × wdth 70, 100, 140.
• Variable font MachineMadeHeddle[wdth,wght].ttf (107 KB, WOFF2 49 KB). It keeps the overlaps and sets the overlap flags.
• 11 static TTFs (about 20 KB each): 9 weights at width 100, Compressed Bold and Extended Bold. Static WOFF2 for Regular and Bold.
• The statics come from the masters by the same interpolation as the variable font. Overlaps are removed with pathops, and the build checks every union against a nonzero fill.
• 197 glyphs, 184 code points:
  • printable ASCII;
  • the Latin-1 letters, with accents as components;
  • ß Æ æ Ø ø Ð ð Þ þ Œ œ Ÿ ı;
  • quotes, guillemets, … • · ¡ ¿ € ₹ © ® ° —;
  • the no-break space.
    Figures are tabular. & is redrawn.
• Class kerning for display use.
• STAT names the 9 weights and 5 widths (Compressed 70, Condensed 85, Normal 100, Wide 120, Extended 140). fvar has 13 named instances. Only 18 of the 45 width + weight names fit in 32 characters, so the other combinations stay unnamed.
• 334 tests, proofs (proofs/heddle/), a comparison of the sketch with the font, and a drift report.
• .github/workflows/heddle.yml: tests, build, byte check, interpolatable, drift report, Fontspector, proofs.
• release.yml gets a heddle job for heddle-v* tags (push and manual run). package_release.sh packs Heddle.
• Site: a Heddle page (playground with weight and width, width rows, weight rows, glyph map), a home card, a download section and a nav link.
• Root README, STATUS, CHANGELOG and LICENSING list Heddle.

Checks (local, 2026-10-27)

• pytest: 334 passed. One test runs the sketch engine in node and compares advances at all 12 masters.
• The build is byte-reproducible. A rebuild with Python 3.14 (the CI version) gives the same bytes as the committed fonts.
• fonttools varLib.interpolatable is clean on the designspace, the master UFOs and the variable font.
• Fontspector 1.9.0, universal profile: 0 FAIL, 0 ERROR. Accepted WARNs:
  • contour_count and mandatory_avar_table on the variable font;
  • PostScript names longer than 27 characters on 3 statics.
• The site builds and its checks pass. No console errors, no failed requests, no horizontal scroll at 360 px.

Review

• Proofs:
  • proofs/heddle/heddle-sketch-vs-font-charset.png
  • heddle-sketch-vs-font-pangram.png
  • heddle-designspace.png
  • heddle-width-ladder.png
  • heddle-accents.png
  • heddle-kerning.png
• Deviations from the sketch, with reasons, are in heddle/STATUS.md:
  • side cuts instead of erased rectangles;
  • curves are cubics, not 96-point polygons;
  • tabular figure width is linear between masters;
  • the K arm no longer pokes out left of the stem at heavy weights;
  • short width names, so names fit in 32 characters.
• Interpolation drift: the median is 0. The worst is J at wght 900, wdth 85, where 11 % of its ink moves. The cause is the sketch's width floor W >= 2.3 S (proofs/heddle/drift.json).
• CI for Heddle has not run on GitHub yet. This PR is its first run.

🤖 Generated with Claude Code

https://claude.ai/code/session_01UHtj1XPp34FFs8LVpY1PRF

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[cubic-dev-ai]

This PR has 7,647 reviewable changed lines after ignored/generated files are excluded, above this repository's 5,000-changed-line automatic review limit.

Most of the diff comes from:

• proofs/shuttle/drift.json (~2,077 changed lines)
• shuttle/loom/glyphs.py (~1,424 changed lines)
• shuttle/loom/build.py (~555 changed lines)
• shuttle/reference/shuttle-sketch-0.1.html (~537 changed lines)
• shuttle/loom/geom.py (~417 changed lines)

Comment @cubic-dev-ai review this to review it anyway. If the largest files are generated or fixture data, add them to your ignored files in review settings or reviews.ignore.files in cubic.yaml. Later automatic reviews cover only subsequent changes. Request a full review to revisit earlier changes. You can also raise this limit in review settings.