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Terminal background: decide 24-bit color like tcell, and log why

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The check only looked at COLORTERM, but tcell also draws 24-bit color for
terminals whose description has it (xterm-ghostty, xterm-kitty), so in
Ghostty on macOS without COLORTERM the background was never used. Use
tcell's rules, and always log which background is used and why.

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 11:53:47 +02:00
co-authored by Claude Opus 5.5
parent 0270462fe4
commit d2e868293f
5 changed files with 48 additions and 18 deletions
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SPECS.md
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@@ -103,7 +103,7 @@ Layout sketch (Library view; the other views follow the same frame):
Popups for action feedback appear in the bottom right and fade away; the Log view (F7) keeps the history.
Colors: the panes' background is the terminal's own background color (asked with OSC 11 at startup) when the terminal has 24-bit color and a dark background; otherwise tview's default, palette color 0. Color themes often make color 0 a grey lighter than their background (Catppuccin: `#45475a` on `#1e1e2e`), on which grey text almost disappears. Light backgrounds keep color 0 because the text colors are made for dark ones.
Colors: the panes' background is the terminal's own background color (asked with OSC 11 at startup) when the terminal has 24-bit color (by tcell's rules: `TCELL_TRUECOLOR`, `COLORTERM`, or a terminal description with direct color such as `xterm-ghostty`, which Ghostty on macOS uses without setting `COLORTERM`) and a dark background, and the Log says which and why; otherwise tview's default, palette color 0. Color themes often make color 0 a grey lighter than their background (Catppuccin: `#45475a` on `#1e1e2e`), on which grey text almost disappears. Light backgrounds keep color 0 because the text colors are made for dark ones.
tview primitives: `Pages` (views and stacked overlays), `Flex` (layout), `InputField` (search), `List`/`Table` (results, queues, library), `TextView` (details, log), `Form` (add dialog), `Modal` (confirmations). Popups are drawn by a wrapper around the root primitive.