feat: add automatic dark/light theme switching based on system preference#397
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…ence Detect the system color scheme using the dark-light crate and automatically switch the TUI between dark and light palettes. The theme is re-checked every ~5 seconds so toggling the desktop dark mode is reflected without restarting. - Add Theme struct with 19 semantic color fields and dark/light palettes - Add ThemePreference config option (auto/dark/light) in config.toml - Replace ~90 hardcoded Color:: references across all 13 UI modules - Parameterise syntax highlighting to switch between base16-ocean themes - Invalidate syntax cache on theme change via extended thread-local key Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The previous implementation called dark_light::detect() on the main thread every ~5 seconds, which blocked the UI during the synchronous D-Bus call. Move detection to a dedicated background thread (tui-theme-watcher) that sleeps independently and sends ThemeChanged events through the existing event channel when the system color scheme changes. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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## 🤖 New release
* `dap-gui-config`: 0.1.0 -> 0.2.0 (⚠ API breaking changes)
* `dap-gui-ui-core`: 0.1.0 -> 0.1.1 (✓ API compatible changes)
* `dap-gui-egui`: 0.1.0 -> 0.1.1
* `dap-tui`: 0.1.0 -> 0.1.1
### ⚠ `dap-gui-config` breaking changes
```text
--- failure constructible_struct_adds_field: externally-constructible struct adds field ---
Description:
A pub struct constructible with a struct literal has a new pub field. Existing struct literals must be updated to include the new field.
ref: https://doc.rust-lang.org/reference/expressions/struct-expr.html
impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/constructible_struct_adds_field.ron
Failed in:
field Config.theme in /tmp/.tmppHoepB/dap-gui/crates/config/src/lib.rs:26
```
<details><summary><i><b>Changelog</b></i></summary><p>
## `dap-gui-config`
<blockquote>
##
[0.2.0](dap-gui-config-v0.1.0...dap-gui-config-v0.2.0)
- 2026-04-07
### Added
- add automatic dark/light theme switching based on system preference
([#397](#397))
### Other
- release v0.1.0 ([#394](#394))
</blockquote>
## `dap-gui-ui-core`
<blockquote>
##
[0.1.1](dap-gui-ui-core-v0.1.0...dap-gui-ui-core-v0.1.1)
- 2026-04-07
### Added
- add automatic dark/light theme switching based on system preference
([#397](#397))
- add log rotation, non-blocking writes, and CLI log flags
([#398](#398))
- use launch config cwd and show file browser overflow
([#396](#396))
- add configurable keybindings with TOML config file
([#393](#393))
</blockquote>
## `dap-gui-egui`
<blockquote>
##
[0.1.1](dap-gui-egui-v0.1.0...dap-gui-egui-v0.1.1)
- 2026-04-07
### Added
- add automatic dark/light theme switching based on system preference
([#397](#397))
- use launch config cwd and show file browser overflow
([#396](#396))
- add configurable keybindings with TOML config file
([#393](#393))
</blockquote>
## `dap-tui`
<blockquote>
##
[0.1.1](dap-tui-v0.1.0...dap-tui-v0.1.1)
- 2026-04-07
### Added
- add automatic dark/light theme switching based on system preference
([#397](#397))
- add log rotation, non-blocking writes, and CLI log flags
([#398](#398))
- use launch config cwd and show file browser overflow
([#396](#396))
- add readline keybindings and input history to all text input fields
- add configurable keybindings with TOML config file
([#393](#393))
- default to file picker panel on startup without target
</blockquote>
</p></details>
---
This PR was generated with
[release-plz](https://github.com/release-plz/release-plz/).
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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Summary
Themestruct with 19 semantic color fields and dark/light palettes, replacing ~90 hardcodedColor::references across all 13 TUI UI modulesdark-lightcrate (freedesktop portal on Linux) and re-check every 2s in a background threadtheme = "auto" | "dark" | "light"config option inconfig.tomlto override detectionbase16-ocean.darkandbase16-ocean.lightTest plan
cargo check --all-targets --all-featurespassescargo xtask test)cargo xtask doctest)theme = "light"in config, confirm light palette🤖 Generated with Claude Code