[Wip] CLI & Daemon

iota-cli/src/theme/mod.rs

@@ -3,10 +3,81 @@ mod model;
 mod name;
 mod presets;
 
-pub use config::{DaemonStartPolicy, UiConfig};
+pub use config::{DaemonStartPolicy, TerminalPolicy, UiConfig};
 pub use model::*;
 pub use name::ThemeName;
 
 pub fn resolve(name: ThemeName) -> ResolvedTheme {
     presets::resolve(name)
 }
+
+pub fn resolve_with_capabilities(
+    name: ThemeName,
+    color_enabled: bool,
+    unicode_enabled: bool,
+) -> ResolvedTheme {
+    let mut theme = if color_enabled {
+        presets::resolve(name)
+    } else {
+        presets::resolve(ThemeName::Monospace)
+    };
+    theme.name = name;
+    theme.unicode = unicode_enabled;
+    if !unicode_enabled {
+        if matches!(theme.console.cursor, CursorPresentation::Character { .. }) {
+            theme.console.cursor = CursorPresentation::Character {
+                glyph: "|",
+                style: theme.console.text,
+            };
+        }
+    }
+    theme
+}
+
+/// Resolve a theme against the terminal's color depth. Surface uses RGB
+/// colors, so a portable ANSI preset is selected when truecolor is absent.
+pub fn resolve_with_terminal_profile(
+    name: ThemeName,
+    color_enabled: bool,
+    unicode_enabled: bool,
+    truecolor_enabled: bool,
+) -> ResolvedTheme {
+    let effective = if color_enabled && !truecolor_enabled && matches!(name, ThemeName::Surface) {
+        ThemeName::Ansi
+    } else {
+        name
+    };
+    resolve_with_capabilities(effective, color_enabled, unicode_enabled)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use ratatui::style::Color;
+
+    #[test]
+    fn no_color_policy_removes_palette_dependencies() {
+        let theme = resolve_with_capabilities(ThemeName::Surface, false, true);
+        assert_eq!(theme.name, ThemeName::Surface);
+        assert_eq!(theme.status.error.fg, None);
+        assert_eq!(theme.surfaces.panel.bg, None);
+    }
+
+    #[test]
+    fn ascii_policy_replaces_character_cursor() {
+        let theme = resolve_with_capabilities(ThemeName::Monospace, false, false);
+        assert!(!theme.unicode);
+        match theme.console.cursor {
+            CursorPresentation::Character { glyph, .. } => assert_eq!(glyph, "|"),
+            CursorPresentation::StyledCell(_) => panic!("expected an ASCII character cursor"),
+        }
+        assert_ne!(theme.graphs.ram, Color::Blue);
+    }
+
+    #[test]
+    fn surface_uses_ansi_fallback_without_truecolor() {
+        let theme = resolve_with_terminal_profile(ThemeName::Surface, true, true, false);
+        assert_eq!(theme.name, ThemeName::Ansi);
+        assert_eq!(theme.surfaces.panel.bg, None);
+    }
+}