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when none is on PATH
Users hit a silent-failure mode where `kitty-gfx--sixel-detect' returned
true (terminal supports Sixel) but no encoder was on `PATH', so every
`sixel-place' logged `no encoder found' and produced no image. The
echo-area `message' from `sixel-encode' was easy to miss inside tmux,
which made the issue look like a refresh / tmux passthrough bug.
- README.org: Requirements section now explicitly lists a Sixel encoder
as required and recommends `img2sixel' (libsixel) over ImageMagick,
with the concrete numbers from PR #10's bench (~2.2x smaller payload,
~10x faster) and a note that this matters most inside tmux because
every refresh re-emits the full DCS payload. Known-Limitations
reworded: missing encoder = silent failure surfaced via the debug log.
- AGENTS.md: Dependencies block reorganised the same way; adds a
pointer to `just sixel-encoder' as the first step when diagnosing
Sixel rendering bugs.
- kitty-graphics.el: when the active backend is Sixel and
`kitty-gfx--sixel-resolve-encoder' returns nil at mode-enable time,
fire a `display-warning' (`*Warnings*' buffer + visible message)
pointing at img2sixel/ImageMagick, so the failure is no longer
buried in /tmp/kitty-gfx.log.
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Sixel detection used to hard-disable the moment `$TMUX' was set. That
guard predates tmux 3.4 (released 2024-02-13), which ships native Sixel
rendering, so we were rejecting a working configuration. Drop the hard
guard, gate on a parsed `tmux -V' >= 3.4, and let users opt out via a
new custom var.
- `kitty-gfx-tmux-allow-sixel' (default t). Set to nil if your tmux
build lacks `--enable-sixel' or if you want to avoid the upstream
scroll artifact (tmux's cell buffer is not pixel-aware, so images may
persist after scrolling).
- `kitty-gfx--tmux-version' parses `tmux -V' once per session and
caches the result in `kitty-gfx--tmux-version-cache' (with an
`unset' sentinel so we can distinguish "not probed" from "no tmux").
- `kitty-gfx--tmux-sixel-supported-p' centralises the (in-tmux + opt-in
+ version >= 3.4) check.
- `kitty-gfx--sixel-detect' now uses the helper instead of
`(not in-tmux)'. Debug log gained `tmux-ver=' and `tmux-ok='.
- AGENTS.md / README.org / CHANGELOG.org: limitation reworded from
"no tmux support" to a partial entry that explains exactly what works
and what the remaining caveats are (Kitty APC passthrough is still
unimplemented; scroll artifacts are upstream).
- justfile: new `test-sixel-tmux' recipe wraps `test-sixel-image' in
`tmux new-session' for one-command interactive verification, and
the sibling `test-sixel-image' recipe was switched from a fragile
shell conditional to an elisp `when' so passing an encoder argument
no longer breaks the parse.
Refs #2.
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Add CHANGELOG.org with full 0.4.0 release notes covering sixel support,
text sizing protocol, agent-shell, and bug fixes. Replace demo GIFs with
backend-specific showcases: kitty.gif (truecolor) and foot.gif (sixel).
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- Mention Kitty + Sixel in title and overview
- List Sixel-compatible terminals (foot, Konsole, xterm, mlterm, mintty)
- Document auto-detection order and kitty-gfx-preferred-protocol defcustom
- Simplify installation guard to (not (display-graphic-p))
- Add backend-specific sections to How It Works
- Update Known Limitations for both protocols
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- Add org LaTeX preview and doc-view to integrations list
- Add usage instructions for LaTeX (C-c C-x C-l) and doc-view
(n/p navigation, +/-/0 zoom)
- Update customization table: max-width 120, max-height 40
- Add LaTeX (texlive+dvipng) and doc-view (ghostscript) to
requirements
- Note doc-view centering flash as known limitation
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- Query terminal cell size via CSI 16t (XTWINOPS) instead of hardcoded
8x16 fallback, giving accurate image aspect ratios
- Wrap all placement output in synchronized output (DEC mode 2026) to
eliminate flicker during scroll and redisplay
- Add native dirvish preview dispatcher (kitty-image) that hooks into
dirvish-preview-dispatchers for automatic image preview
- Improve shr/eww advice to detect actual image type from spec
- Extract kitty-gfx--refresh-overlay for cleaner refresh cycle
- Reset position cache on buffer/window change so images re-place after d=a
- Bump version to 0.2.0, update package metadata and README
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Display images in terminal Emacs via Kitty graphics protocol
with direct placements. Integrates with org-mode (including
org-link-preview for org 10.0+), image-mode, and shr/eww.
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