Fork/iced

[mikklee]

Replace GTK with Iced

Summary

This PR is a major rewrite of Sirula, replacing the GTK framework with Iced and iced_layershell for Wayland layer shell support. The project is renamed to Cirula to distinguish it from the original.

Motivation

• GTK has many non-Rust dependencies, making builds more complex
• Sirula has not been actively maintained
• Iced provides a pure-Rust UI framework with fewer external dependencies
• Better NixOS compatibility (icons render correctly)
  • This is mainly due to NixOS storing icons in different locations than usual.

Changes

UI Framework Migration

• Replaces GTK with Iced for the entire UI
• Replaces gtk-layer-shell with iced_layershell
• Removes CSS theming in favor of TOML-based configuration with built-in themes

Theming System

• Adds 22 built-in themes (Catppuccin, Tokyo Night, Kanagawa, Dracula, Nord, Gruvbox, etc.)
  • Note! These are colour themes.
• Adds support for custom colour palettes via [custom_palette] in config
• Theme selection via app_theme config option

Locale Handling

• Replaces libc with icu_collator/icu_locale for locale-aware string sorting
• Adds locale config option to override system locale using ICU format (e.g., nb-NO)
• Parses POSIX locale format (e.g., en_US.UTF-8) and converts to ICU format

Performance

• ~5x faster startup by using tokio for parallel .desktop file parsing
  • Synchronous: ~268ms
  • Async parallel: ~54ms (debug build, ~200 desktop files)
  • Note! Does use more CPU.
  • Note! The results are representative of my computer HW. You may get different results.

CI/CD

• Added GitHub Actions workflow for cargo test, cargo clippy, and cargo fmt --check

Code Quality

• Suppressed clippy zombie_processes warnings with comment
  • I'm honestly not sure if this can be done better.

Breaking Changes

• Config directory changed from ~/.config/sirula/ to ~/.config/cirula/
• CSS styling no longer supported (use 'TOML theming' instead)
• Some config options have been removed:
  • close_on_unfocus (To exit: press ESC ): Will look into how to re-implement this
  • lines: Not sure if this has much value
  • markup_default, markup_highlight, markup_extra: Will look into how to re-implement this

Dependencies

Removed	Added
gtk	iced
gtk-layer-shell	iced_layershell
libc	icu_collator
locale-types	icu_locale
	tokio (fs, rt-multi-thread)

Other

Example screenshots and most example configurations are removed. Will be added at a later date. The basic still looks more or less the same.