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Cover style "halves": left and right half blocks only

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Twice the horizontal detail of "cells", for terminals such as macOS
Terminal whose upper and lower half blocks do not meet at the middle of
the cell.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019reK4DUGYqDUjniWYJvwUW
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nils
2026-10-21 11:38:04 +02:00
co-authored by Claude Opus 5.5
parent 417e61da00
commit 8f162729ea
8 changed files with 30 additions and 9 deletions
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CHANGELOG.md
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- **Posters in macOS Terminal:** Terminal.app draws the half and quarter blocks from the font, and
their halves do not meet at the middle of the cell, so posters looked like rows of shifted dots.
`auto` now draws them there as plain colored cells (new `ui.cover_style` value `cells`): coarser,
but even. For real images on macOS use Ghostty or kitty.
but even. `halves` (left and right half blocks only, twice the detail across) can be tried there
too. For real images on macOS use Ghostty or kitty.
- **Real images in Ghostty and kitty on macOS:** the question whether the terminal supports the
Kitty graphics protocol gave up at once on macOS (a terminal device there cannot have a read
timeout in Go), so posters were always drawn with blocks. It now waits with select(2).
- **Real images only when the terminal confirms it:** the terminal is asked whether it supports the
Kitty graphics protocol before real-image posters are used, so terminals that only look like kitty
or Ghostty no longer get graphics commands printed as text. On macOS the sextant blocks are no