guise-ui 1.5.3

A component library for gpui, Zed's GPU-accelerated UI framework: a themed palette, sizing tokens, 130+ composable components, a reactive state layer, and an in-app Safari-style inspector.
Documentation 
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//! Diagnostics for the editor: LSP-shaped severity + line/column ranges.
//!
//! Pure data — the host produces them (from a compiler, linter, or language
//! server) and hands them to [`Editor::set_diagnostics`](super::Editor::set_diagnostics).
//! The editor draws a gutter dot per affected line, underlines the range,
//! and shows the active line's first message in a strip under the buffer.

use std::ops::Range;

use gpui::{Hsla, SharedString};

use crate::theme::Theme;

/// Diagnostic severity, ordered so `max` picks the worst.
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum Severity {
  Hint,
  Info,
  Warning,
  Error,
}

impl Severity {
  /// The theme accent for this severity.
  pub fn color(self, t: &Theme) -> Hsla {
    match self {
      Severity::Error => t.danger().hsla(),
      Severity::Warning => t.warning().hsla(),
      Severity::Info => t.info().hsla(),
      Severity::Hint => t.dimmed().hsla(),
    }
  }
}

/// One diagnostic, anchored to a line and a char-column range on it.
#[derive(Debug, Clone)]
pub struct Diagnostic {
  /// 0-based line index.
  pub line: usize,
  /// Char columns on the line; an empty range means the whole line.
  pub cols: Range<usize>,
  pub severity: Severity,
  pub message: SharedString,
}

impl Diagnostic {
  pub fn new(
    line: usize,
    cols: Range<usize>,
    severity: Severity,
    message: impl Into<SharedString>,
  ) -> Self {
    Diagnostic {
      line,
      cols,
      severity,
      message: message.into(),
    }
  }

  /// An error/warning/… covering the whole line.
  pub fn line_wide(line: usize, severity: Severity, message: impl Into<SharedString>) -> Self {
    Diagnostic::new(line, 0..0, severity, message)
  }
}

/// The worst severity among `line`'s diagnostics, if any — drives the gutter
/// dot color.
pub(crate) fn line_severity(diagnostics: &[Diagnostic], line: usize) -> Option<Severity> {
  diagnostics
    .iter()
    .filter(|d| d.line == line)
    .map(|d| d.severity)
    .max()
}

/// The first (worst-first, then declaration order) message on `line`.
pub(crate) fn line_message(diagnostics: &[Diagnostic], line: usize) -> Option<&Diagnostic> {
  diagnostics
    .iter()
    .filter(|d| d.line == line)
    .max_by_key(|d| d.severity)
}

#[cfg(test)]
mod tests {
  use super::*;

  #[test]
  fn severity_orders_worst_last() {
    assert!(Severity::Error > Severity::Warning);
    assert!(Severity::Warning > Severity::Info);
    assert!(Severity::Info > Severity::Hint);
  }

  #[test]
  fn line_lookups_pick_the_worst() {
    let diags = vec![
      Diagnostic::new(2, 0..4, Severity::Warning, "unused"),
      Diagnostic::new(2, 6..9, Severity::Error, "type mismatch"),
      Diagnostic::line_wide(5, Severity::Hint, "style"),
    ];
    assert_eq!(line_severity(&diags, 2), Some(Severity::Error));
    assert_eq!(line_severity(&diags, 5), Some(Severity::Hint));
    assert_eq!(line_severity(&diags, 0), None);
    assert_eq!(
      line_message(&diags, 2).unwrap().message.as_ref(),
      "type mismatch"
    );
  }

  #[test]
  fn line_wide_uses_an_empty_range() {
    let d = Diagnostic::line_wide(3, Severity::Error, "boom");
    assert!(d.cols.is_empty());
    assert_eq!(d.line, 3);
  }
}