Adds three override hooks so a single-OS developer can preview every
platform's theming without VMs:
AMETHYST_PLATFORM=GNOME ./gradlew :desktopApp:run
AMETHYST_APPEARANCE=light ./gradlew :desktopApp:run
AMETHYST_ACCENT=#3584E4 ./gradlew :desktopApp:run
Each override accepts either an env var or a `-Damethyst.<key>=<value>`
JVM property (forwarded from the gradle invocation via build.gradle.kts).
- PlatformInfo: `amethyst.platform` accepts MACOS, WINDOWS, GNOME, KDE,
LINUX_OTHER, UNKNOWN. Adds a `host` accessor for code that needs the
real underlying OS (for a future fallback hook).
- PlatformAppearance: `amethyst.appearance` accepts light/dark.
- PlatformAccent: `amethyst.accent` accepts `#RRGGBB`, `RRGGBB`, or any
libadwaita accent name (blue, teal, green, yellow, orange, red, pink,
purple, slate).
Window chrome stays native to the host OS — overriding the platform
swaps in-app theming only, not the AWT title bar — so on a Mac you
still see traffic lights even when previewing the GNOME theme.
https://claude.ai/code/session_01NufduPfZvYQVYwLkbCjCUo
Claude
46864a07b8