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use std::fmt;
/// The editor's rendering and interaction mode.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum Mode {
/// Read-only preview; no cursor, no raw Markdown. Files open here.
#[default]
Preview,
/// Hybrid editing: the active line (or table cell) shows raw Markdown, the rest renders.
Rendered,
/// Whole document as plain Markdown text.
Raw,
/// Inline diff review of the pre-change rope vs. on-disk content.
/// Invariant: `state.mode == Mode::Diff ⟺ state.diff.is_some()`, maintained by
/// [`super::EditorState::enter_diff_mode`] / [`super::EditorState::exit_diff_mode`].
Diff,
}
impl fmt::Display for Mode {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Mode::Preview => f.write_str("PREVIEW"),
Mode::Rendered => f.write_str("EDIT"),
Mode::Raw => f.write_str("RAW"),
Mode::Diff => f.write_str("DIFF"),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn mode_display() {
assert_eq!(Mode::Preview.to_string(), "PREVIEW");
assert_eq!(Mode::Rendered.to_string(), "EDIT");
assert_eq!(Mode::Raw.to_string(), "RAW");
}
#[test]
fn mode_default_is_preview() {
assert_eq!(Mode::default(), Mode::Preview);
}
}