twrite-gpui 0.9.0

//! GPUI rendering, canvas text-shaping, and interactive editor component for twrite.

/// Canvas element handling prepaint, layout, and GPU quad rendering.
pub mod canvas;
/// Configuration settings for font size, line height, wrapping, and gutters.
pub mod config;
/// Main editor entity, keybindings, selections, and hook executions.
pub mod editor;
/// Frame-rate HUD for interactive performance testing.
pub mod fps;
/// Translation helpers from GPUI key events to normalized twrite key events.
pub mod input;
/// Per-version viewport cache for highlight/conceal/link inputs.
pub mod layout_cache;
/// Dumb renderer for the shared headless prompt (bottom bar, palette).
pub mod prompt_bar;
/// Color palettes, Catppuccin themes, and syntax token style resolution.
pub mod theme;

pub use canvas::{EditorCanvas, LineMetrics, RunFonts, build_line_text_runs};
pub use config::EditorConfig;
pub use editor::{Editor, FaceAvailability, SelectionGranularity, VisibleLineLayout, VisibleLink};
pub use fps::{FrameStats, fps_badge};
pub use layout_cache::{CachedInput, LayoutCache};
pub use prompt_bar::PromptBar;
pub use theme::{EditorTheme, ResolvedTokenStyle, SyntaxTheme};

#[cfg(test)]
mod tests {
    use super::*;
    use gpui::{Font, FontStyle, FontWeight, px};
    use twrite_core::{HighlightTag, StyleSpan};

    #[test]
    fn test_line_metrics_quote_detection_when_concealed() {
        let spans = vec![StyleSpan::tag(0..2, HighlightTag::Blockquote)];
        let metrics = LineMetrics::for_line("> Quote", "Quote", &spans, px(16.0), px(22.0));
        assert!(metrics.is_quote);
        assert!(!metrics.is_code_block);
        assert_eq!(metrics.line_height, px(22.0));

        // No tag -> no quote, proving detection is tag-driven not string-driven.
        let plain = LineMetrics::for_line("> Quote", "> Quote", &[], px(16.0), px(22.0));
        assert!(!plain.is_quote);
    }

    #[test]
    fn test_line_metrics_code_fence() {
        let active_spans = vec![StyleSpan::tag(0..7, HighlightTag::Code)];
        let metrics =
            LineMetrics::for_line("```rust", "```rust", &active_spans, px(16.0), px(22.0));
        assert_eq!(metrics.line_height, px(22.0));
        assert!(metrics.is_code_block);
    }

    #[test]
    fn test_line_metrics_code_empty_line_inside_block() {
        let spans = vec![StyleSpan::tag(0..0, HighlightTag::Code)];
        let metrics = LineMetrics::for_line("", "", &spans, px(16.0), px(22.0));
        assert!(metrics.is_code_block);
        assert_eq!(metrics.line_height, px(22.0));
    }

    #[test]
    fn test_build_line_text_runs_code_block_disables_text_bg() {
        let theme = EditorTheme::default();
        let font: Font = gpui::font(".SystemUIFont");
        let spans = vec![StyleSpan::tag(0..4, HighlightTag::Code)];

        let runs_block = build_line_text_runs(
            "test",
            &spans,
            None,
            &RunFonts {
                base: &font,
                code: &font,
            },
            &theme,
            true,
            false,
        );
        assert_eq!(runs_block.len(), 1);
        assert!(runs_block[0].background_color.is_none());

        let runs_inline = build_line_text_runs(
            "test",
            &spans,
            None,
            &RunFonts {
                base: &font,
                code: &font,
            },
            &theme,
            false,
            false,
        );
        assert_eq!(runs_inline.len(), 1);
        assert_eq!(runs_inline[0].background_color, Some(theme.syntax.code_bg));

        let runs_task_checked = build_line_text_runs(
            "test",
            &spans,
            None,
            &RunFonts {
                base: &font,
                code: &font,
            },
            &theme,
            false,
            true,
        );
        assert_eq!(runs_task_checked.len(), 1);
        assert!(runs_task_checked[0].strikethrough.is_some());
    }

    #[test]
    fn test_line_metrics_task_state_detection() {
        let unchecked_spans = vec![StyleSpan::tag(0..6, HighlightTag::TaskUnchecked)];
        let unchecked =
            LineMetrics::for_line("- [ ] Todo", "Todo", &unchecked_spans, px(16.0), px(22.0));
        assert_eq!(unchecked.task_state, Some(false));

        let checked_spans = vec![StyleSpan::tag(0..6, HighlightTag::TaskChecked)];
        let checked =
            LineMetrics::for_line("- [x] Done", "Done", &checked_spans, px(16.0), px(22.0));
        assert_eq!(checked.task_state, Some(true));

        let plain = LineMetrics::for_line("Plain text", "Plain text", &[], px(16.0), px(22.0));
        assert_eq!(plain.task_state, None);

        // Raw task syntax without tags must NOT be detected (custom-language proof).
        let raw_only = LineMetrics::for_line("- [ ] Todo", "- [ ] Todo", &[], px(16.0), px(22.0));
        assert_eq!(raw_only.task_state, None);
    }

    #[test]
    fn test_line_metrics_thematic_break_detection() {
        let spans = vec![StyleSpan::tag(0..3, HighlightTag::HorizontalRule)];
        let metrics = LineMetrics::for_line("---", "---", &spans, px(16.0), px(22.0));
        assert!(metrics.is_thematic_break);

        let plain = LineMetrics::for_line("---", "---", &[], px(16.0), px(22.0));
        assert!(!plain.is_thematic_break);
    }

    #[test]
    fn test_visible_link_layout() {
        let link = VisibleLink {
            bounds: gpui::Bounds::new(
                gpui::point(px(50.0), px(20.0)),
                gpui::size(px(60.0), px(20.0)),
            ),
            url: "https://example.com".to_string(),
        };
        assert!(link.bounds.contains(&gpui::point(px(60.0), px(25.0))));
        assert!(!link.bounds.contains(&gpui::point(px(120.0), px(25.0))));
        assert_eq!(link.url, "https://example.com");
    }

    /// Returns the font of the run covering byte `idx` in `text`.
    fn run_font_at(runs: &[gpui::TextRun], text: &str, idx: usize) -> gpui::Font {
        let mut offset = 0;
        for run in runs {
            if idx < offset + run.len {
                return run.font.clone();
            }
            offset += run.len;
        }
        panic!("idx {idx} out of runs for {text:?}");
    }

    #[test]
    fn test_build_line_text_runs_bold_italic_fonts() {
        // Proves the span -> run pipeline requests real faces: if bold/italic
        // don't *paint* differently, the cause is missing OS font faces
        // (silent font-kit fallback), not this pipeline.
        let theme = EditorTheme::default();
        let font: Font = gpui::font(".SystemUIFont");
        let text = "Hi bold and ital!";
        let spans = vec![
            StyleSpan::tag(3..7, HighlightTag::Bold),
            StyleSpan::tag(12..16, HighlightTag::Italic),
        ];
        let runs = build_line_text_runs(
            text,
            &spans,
            None,
            &RunFonts {
                base: &font,
                code: &font,
            },
            &theme,
            false,
            false,
        );

        let plain = run_font_at(&runs, text, 0);
        assert_eq!(plain.weight, FontWeight::NORMAL);
        assert_eq!(plain.style, FontStyle::Normal);

        let bold = run_font_at(&runs, text, 4);
        assert_eq!(bold.weight, FontWeight::BOLD);
        assert_eq!(bold.style, FontStyle::Normal);

        let italic = run_font_at(&runs, text, 13);
        assert_eq!(italic.weight, FontWeight::NORMAL);
        assert_eq!(italic.style, FontStyle::Italic);
    }

    #[test]
    fn test_build_line_text_runs_code_spans_use_code_font() {
        let theme = EditorTheme::default();
        let font: Font = gpui::font(".SystemUIFont");
        let code_font = Font {
            family: "CodeFam".into(),
            ..gpui::font(".SystemUIFont")
        };
        let text = "a `b` c";
        let spans = vec![StyleSpan::tag(2..5, HighlightTag::Code)];
        let runs = build_line_text_runs(
            text,
            &spans,
            None,
            &RunFonts {
                base: &font,
                code: &code_font,
            },
            &theme,
            false,
            false,
        );

        assert_eq!(
            run_font_at(&runs, text, 0).family.as_ref(),
            font.family.as_ref()
        );
        assert_eq!(run_font_at(&runs, text, 3).family.as_ref(), "CodeFam");
        assert_eq!(
            run_font_at(&runs, text, 6).family.as_ref(),
            font.family.as_ref()
        );
    }

    #[test]
    fn test_line_metrics_heading_levels() {
        let h1 = LineMetrics::for_line(
            "# A",
            "# A",
            &[StyleSpan::tag(0..3, HighlightTag::Heading(1))],
            px(16.0),
            px(22.0),
        );
        assert_eq!(h1.font_size, px(16.0) * 2.0);

        let h4 = LineMetrics::for_line(
            "#### D",
            "#### D",
            &[StyleSpan::tag(0..6, HighlightTag::Heading(4))],
            px(16.0),
            px(22.0),
        );
        assert_eq!(h4.font_size, px(16.0) * 1.125);

        // Lowest level wins when several heading tags share a line.
        let mixed = LineMetrics::for_line(
            "mix",
            "mix",
            &[
                StyleSpan::tag(0..3, HighlightTag::Heading(3)),
                StyleSpan::tag(0..3, HighlightTag::Heading(1)),
            ],
            px(16.0),
            px(22.0),
        );
        assert_eq!(mixed.font_size, px(16.0) * 2.0);

        // Out-of-range levels render bold at the base size.
        let odd = LineMetrics::for_line(
            "odd",
            "odd",
            &[StyleSpan::tag(0..3, HighlightTag::Heading(9))],
            px(16.0),
            px(22.0),
        );
        assert_eq!(odd.font_size, px(16.0));
        assert_eq!(odd.line_height, px(22.0));
    }

    #[test]
    fn test_custom_tag_colors() {
        let mut theme = EditorTheme::default();
        // Unregistered customs fall back to the foreground.
        assert_eq!(
            theme.tag_color(HighlightTag::Custom("speaker")),
            theme.foreground
        );

        theme
            .syntax
            .set_custom_tag_color("speaker", gpui::rgb(0xf9e2af).into());
        assert_eq!(
            theme.tag_color(HighlightTag::Custom("speaker")),
            gpui::rgb(0xf9e2af).into()
        );
        // Other names are unaffected.
        assert_eq!(
            theme.tag_color(HighlightTag::Custom("dialogue")),
            theme.foreground
        );
    }

    #[test]
    fn test_heading_level_colors() {
        let theme = EditorTheme::default();
        assert_eq!(
            theme.tag_color(HighlightTag::Heading(1)),
            theme.syntax.heading1
        );
        assert_eq!(
            theme.tag_color(HighlightTag::Heading(2)),
            theme.syntax.heading2
        );
        assert_eq!(
            theme.tag_color(HighlightTag::Heading(4)),
            theme.syntax.heading3
        );
    }
}