kimun_notes/app_screen/

editor_input.rs

//! The editor screen's input classifier: resolves one raw input event into an
//! **Intent** — what the event *means* under the screen's input precedence —
//! before anything mutates. `classify` is pure over an [`InputCtx`] snapshot,
//! so the precedence (leader → paste intercepts → shortcuts → overlay →
//! mouse → panels) is table-tested here instead of living as statement order
//! inside `EditorScreen::handle_input`. The screen builds the snapshot,
//! classifies, then *executes* the intent.
//!
//! A pending leader sequence owns the input first (spec §8a) — including
//! ahead of the paste intercepts, which in the pre-extraction ladder sat
//! above it (the old quirk let a leader-pending Ctrl+V paste an image and
//! leave the sequence pending). Ctrl-chords and paste payloads cancel the
//! sequence and dispatch normally; every other key feeds it.
//!
//! Two decided collaterals of that reorder, both asserted by tests below:
//! Ctrl+Enter mid-sequence now feeds the leader instead of following the
//! link (Enter is not a `Char` chord, so no exception applies — §8a wins
//! over the old follow-link-first order), and a paste arriving mid-sequence
//! under an open overlay cancels the leader where the old ladder left it
//! pending (the paste rule applies regardless of who receives the paste).

use ratatui::crossterm::event::KeyEvent;

use crate::components::drawer::DrawerView;
use crate::components::events::InputEvent;
use crate::components::overlay::OverlayKind;
use crate::components::panel::PanelKind;
use crate::components::text_editor::EditorClaim;
use crate::keys::action_shortcuts::{ActionShortcuts, TextAction};
use crate::keys::key_strike::KeyStrike;
use crate::keys::{KeyBindings, key_event_to_combo};

/// Snapshot of the screen state the classifier needs. Built per event by
/// `EditorScreen::handle_input`; keep it minimal — every field is a reason
/// the classification can change.
#[derive(Debug, Clone, PartialEq)]
pub struct InputCtx {
    /// The open overlay's kind, `None` when no overlay is open.
    pub overlay: Option<OverlayKind>,
    /// A leader key sequence is pending.
    pub leader_pending: bool,
    /// The focused panel.
    pub focused: PanelKind,
    /// The active drawer view (regardless of drawer visibility).
    pub drawer_view: DrawerView,
    /// Bare Space starts the leader (vim Normal mode, empty pending state).
    pub space_leads: bool,
    /// Which editor-internal surface holds input, if any. Without
    /// this the classifier cannot know the **find bar** is open, and ownership
    /// gets re-decided further down, once per event kind.
    pub claim: EditorClaim,
    /// This mouse press completes a double-click in the editor column — the
    /// mouse's way of following a link (see `click_run`).
    ///
    /// An *input* to classification, not an output: it picks between
    /// [`EditorIntent::Mouse`] and [`EditorIntent::FollowLink`], so no intent
    /// variant has to name the gesture that produced it. The rule itself lives
    /// in [`ClickRun`](crate::app_screen::click_run::ClickRun); the screen
    /// records the press before building this snapshot.
    pub double_click: bool,
}

impl InputCtx {
    /// The editor owns key input: it is focused and no overlay sits over it.
    /// Mirrors `EditorScreen::editor_active`.
    fn editor_active(&self) -> bool {
        self.focused == PanelKind::Editor && self.overlay.is_none()
    }

    fn find_panel_focused(&self) -> bool {
        self.focused == PanelKind::Drawer && self.drawer_view == DrawerView::Find
    }
}

/// The classifier's full verdict: pre-effects plus the intent. The executor
/// applies `flash` and `cancel_leader` first, then runs the intent.
#[derive(Debug, Clone, PartialEq)]
pub struct Classification {
    /// Footer chord flash (F-keys and Ctrl/Alt+letter chords, except the
    /// leader gateway, whose affordance is the pending sequence).
    pub flash: Option<String>,
    /// A pending leader sequence must be cancelled before the intent runs
    /// (an overlay opened underneath, or a Ctrl-chord dispatches normally).
    pub cancel_leader: bool,
    pub intent: EditorIntent,
}

/// What one raw input event means in the editor screen. Execution lives in
/// `EditorScreen`; anything that depends on a runtime outcome (the clipboard
/// image probe, a panel's first crack at a key) carries its fallback as data.
#[derive(Debug, Clone, PartialEq)]
pub enum EditorIntent {
    /// Swallow the event (guarded no-ops, the F-key sink).
    Consume,
    /// Bracketed paste into the editor: try an image paste first, fall
    /// back to pasting the event's text payload when the clipboard holds
    /// no image. Carries nothing — the executor reads the payload back
    /// from the event it already holds, so large pastes are never cloned.
    EditorPaste,
    /// Ctrl+V in the editor: probe the clipboard for an image. When there
    /// is none, the executor reclassifies the tail of the ladder
    /// (`classify_tail` with `cancel_leader = false` — the probe
    /// classification already owned any leader cancel) against fresh
    /// screen state. Lazy on purpose: the common with-image press must not
    /// pay for a discarded fallback classification.
    ImageProbe,
    /// Follow the **follow target** under the editor cursor — a link, or a
    /// label whose query is run. Reached two ways, deliberately one intent:
    /// the bound `FollowLink` shortcut, and a double-click, whose first press
    /// put the cursor where the second one asks about (see `click_run`).
    FollowLink,
    /// Feed the key to the pending leader sequence.
    LeaderKey(KeyEvent),
    /// Start a leader sequence and schedule the which-key reveal.
    LeaderStart,
    /// A screen operation with no classification-time policy beyond its
    /// guard (see CONTEXT.md **Intent** — "action" is reserved for
    /// `ActionShortcuts`, the classifier's *input*).
    Op(EditorOp),
    /// Dismiss the overlay when one of `kind` is already open, else `open`.
    ToggleOverlay {
        kind: OverlayKind,
        open: OverlayOpen,
    },
    /// Present the overlay `OverlayOpen` names (the executor builds it from
    /// its seed state). No toggle semantics — see `ToggleOverlay` for those.
    OpenOverlay(OverlayOpen),
    /// Route the event to the open overlay.
    Overlay,
    /// Route the mouse event through the `PanelSet` hit-test path.
    Mouse,
    /// Route the event to the focused panel; on `NotConsumed` apply the
    /// fallback.
    Panel { fallback: PanelFallback },
}

/// Every overlay the editor screen can open, as a construction recipe the
/// executor's one `build_overlay` match turns into the live overlay. Distinct
/// from `OverlayKind` (the *presentation* kind): two recipes share
/// `OverlayKind::NoteBrowser` (search browser vs file finder), so the kind
/// alone cannot pick the opener.
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum OverlayOpen {
    SearchBrowser,
    FileFinder,
    SavedSearches,
    CommandPalette,
    WorkspaceSwitcher,
    ThemePicker,
    /// The flat key-bindings help (F1).
    Help,
    /// The search query syntax reference (F1 over the Find panel).
    QueryHelp,
    /// The full leader-tree cheatsheet (leader `?`).
    Cheatsheet,
    SortQuery,
    SortSidebar,
    QuickNote,
    /// The pinned-notes dialog (leader `f p`).
    PinnedNotes,
}

/// Fallback applied when the focused panel does not consume the event.
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum PanelFallback {
    None,
    /// Tab / Shift-Tab cycle panel focus when the panel passes.
    FocusCycle(CycleDir),
    /// The FIND view yields focus back to the editor on an unhandled Esc.
    FocusEditor,
}

#[derive(Debug, Clone, Copy, PartialEq)]
pub enum CycleDir {
    Left,
    Right,
}

#[derive(Debug, Clone, PartialEq)]
pub enum EditorOp {
    ToggleDrawer,
    FocusLeft,
    FocusRight,
    OpenJournal,
    ShowFileOps,
    ToggleQueryPanel,
    /// Open (or switch the drawer to) FILES and reveal the open note's
    /// directory — never hides the drawer.
    OpenFileBrowserReveal,
    SaveCurrentQuery,
    FindInBuffer,
    /// Open the find bar with the replace field revealed.
    ReplaceInBuffer,
    ApplyText(TextAction),
    /// Switch to the Ask workspace and focus its composer (F6 and leader
    /// `a a`).
    OpenAsk,
}

/// Resolve one raw input event into its [`Classification`] under the editor
/// screen's input precedence. Pure: same event + bindings + ctx, same verdict.
///
/// Runs the precedence ladder, then applies the **editor claim** filter — an
/// intent the current holder does not allow is rewritten so the event reaches
/// the holder instead. With no claim held the filter is the identity,
/// which is why the ladder's own tests are unaffected by it.
pub fn classify(event: &InputEvent, bindings: &KeyBindings, ctx: &InputCtx) -> Classification {
    let mut classification = classify_unclaimed(event, bindings, ctx);
    // An **editor claim** only holds while the editor is the active panel: the
    // bar is inside it, so a drawer click or an open overlay outranks it.
    // Without this the filter would swallow every click anywhere in the app.
    let claim = if ctx.editor_active() {
        ctx.claim
    } else {
        EditorClaim::None
    };
    let filtered = apply_claim(classification.intent.clone(), event, claim);
    if filtered != classification.intent {
        // The chord did not run, so it must not advertise itself in the footer.
        classification.flash = None;
    }
    classification.intent = filtered;
    classification
}

/// Which intents survive an **editor claim**, and what a blocked one becomes.
///
/// An allow-list, exhaustive over [`EditorIntent`]: a new variant defaults to
/// blocked, so getting it wrong shows up as a key that appears to do nothing
/// rather than one that silently edits the note. A block-list would default the
/// other way — which is how `Ctrl+B` came to embolden the note while the user
/// was typing a find pattern.
///
/// A blocked intent becomes [`EditorIntent::Panel`] — the existing default,
/// which routes to the focused panel, which is the editor, which routes to its
/// holder. The claim decides *ownership*; the holder decides behaviour.
fn apply_claim(intent: EditorIntent, event: &InputEvent, claim: EditorClaim) -> EditorIntent {
    if claim == EditorClaim::None {
        return intent;
    }
    let deliver = EditorIntent::Panel {
        fallback: PanelFallback::None,
    };
    let find_bar = claim == EditorClaim::FindBar;
    match intent {
        // Always allowed. A pending leader sequence outranks a claim (spec
        // §8a); the panel default IS the delivery path; an overlay cannot
        // coexist with a claim (a claim implies the editor is focused and
        // unobscured); the palette stays reachable as a global escape.
        EditorIntent::LeaderKey(_)
        | EditorIntent::Panel { .. }
        | EditorIntent::Overlay
        | EditorIntent::ToggleOverlay { .. }
        | EditorIntent::OpenOverlay(_)
        | EditorIntent::Consume => intent,

        // Buffer-targeting ops lose to any holder — typing a find pattern must
        // not embolden the note. Navigation ops are unaffected.
        EditorIntent::Op(EditorOp::ApplyText(_)) => deliver,
        EditorIntent::Op(_) => intent,

        // The find bar is a text field: a paste belongs in it and an image
        // probe is meaningless there. The popup wants both to behave normally.
        EditorIntent::EditorPaste | EditorIntent::ImageProbe => {
            if find_bar {
                deliver
            } else {
                intent
            }
        }

        // Ctrl+Enter must not follow a link out of the bar, so a key-origin
        // follow is delivered to it. A mouse-origin one carries the same intent
        // but is a *press* wearing a different name, so it degrades to whatever
        // a plain press does under this claim — swallowed by the bar, delivered
        // normally under the popup, which wants the click that dismisses it.
        // Abandoning the follow is the point: a holder is mid-edit, and the
        // link under the pointer is text it is still being typed into.
        EditorIntent::FollowLink => match event {
            InputEvent::Mouse(_) => claimed_mouse(event, find_bar),
            _ if find_bar => deliver,
            _ => intent,
        },

        // Bare Space is a character in a find pattern. The bound leader
        // gateway is not — it opens "in every context, including mid-typing",
        // and blocking it here would also make a pending sequence unreachable.
        EditorIntent::LeaderStart => match event {
            InputEvent::Key(k)
                if find_bar
                    && k.code == ratatui::crossterm::event::KeyCode::Char(' ')
                    && k.modifiers.is_empty() =>
            {
                deliver
            }
            _ => intent,
        },

        EditorIntent::Mouse => claimed_mouse(event, find_bar),
    }
}

/// What a claim does to a press. The one policy, so a follow that arrived as a
/// click cannot drift away from the click it is.
///
/// Scrolling moves the viewport, not the cursor, so reading elsewhere
/// mid-search stays available. Clicks and drags would move the cursor off the
/// current match and overwrite the selection marking it — the find bar has no
/// way to represent either. Every other holder takes the press normally.
fn claimed_mouse(event: &InputEvent, find_bar: bool) -> EditorIntent {
    use ratatui::crossterm::event::MouseEventKind;

    match event {
        InputEvent::Mouse(m)
            if find_bar
                && !matches!(
                    m.kind,
                    MouseEventKind::ScrollUp
                        | MouseEventKind::ScrollDown
                        | MouseEventKind::ScrollLeft
                        | MouseEventKind::ScrollRight
                ) =>
        {
            EditorIntent::Consume
        }
        _ => EditorIntent::Mouse,
    }
}

fn classify_unclaimed(
    event: &InputEvent,
    bindings: &KeyBindings,
    ctx: &InputCtx,
) -> Classification {
    use ratatui::crossterm::event::{KeyCode, KeyModifiers};

    // A pending leader sequence owns the input ahead of everything else
    // (spec §8a), including the paste intercepts below. Exceptions: an
    // overlay that opened underneath wins, a Ctrl-chord cancels the sequence
    // then dispatches normally, and a paste payload — not a key the sequence
    // can consume — gets the same cancel-then-dispatch treatment.
    let mut cancel_leader = false;
    if ctx.leader_pending {
        match event {
            InputEvent::Key(key) => {
                if ctx.overlay.is_some() {
                    cancel_leader = true;
                } else if matches!(key.code, KeyCode::Char(_))
                    && key.modifiers.contains(KeyModifiers::CONTROL)
                {
                    cancel_leader = true;
                    // fall through to normal dispatch below
                } else {
                    return Classification {
                        flash: None,
                        cancel_leader: false,
                        intent: EditorIntent::LeaderKey(*key),
                    };
                }
            }
            InputEvent::Paste(_) => cancel_leader = true,
            // Mouse input never fed the sequence; it routes below unchanged.
            InputEvent::Mouse(_) => {}
        }
    }

    // Bracketed paste (terminal-level). The executor tries an image paste
    // first and falls back to the text payload.
    if ctx.editor_active() && matches!(event, InputEvent::Paste(_)) {
        return Classification {
            flash: None,
            cancel_leader,
            intent: EditorIntent::EditorPaste,
        };
    }

    // Ctrl+V: probe the clipboard for an image ahead of the editor's own
    // text paste. No image → the executor reclassifies the tail against
    // fresh state. The leader cancel rides on this classification: the
    // sequence dies whether or not the clipboard holds an image.
    if ctx.editor_active()
        && let InputEvent::Key(key) = event
        && key.modifiers == KeyModifiers::CONTROL
        && key.code == KeyCode::Char('v')
    {
        return Classification {
            flash: None,
            cancel_leader,
            intent: EditorIntent::ImageProbe,
        };
    }

    classify_tail(event, bindings, ctx, cancel_leader)
}

/// The ladder below the leader tier and the paste intercepts: shortcuts →
/// overlay → mouse → vim Space leader → Tab cycle → FIND Esc → focused
/// panel. `cancel_leader` carries the leader tier's verdict into the
/// returned classification. `pub(crate)` for one caller besides
/// [`classify`]: the executor's no-image [`EditorIntent::ImageProbe`]
/// path, which runs the tail against post-probe state.
pub(crate) fn classify_tail(
    event: &InputEvent,
    bindings: &KeyBindings,
    ctx: &InputCtx,
    cancel_leader: bool,
) -> Classification {
    use ratatui::crossterm::event::{KeyCode, KeyModifiers};

    // Ctrl+Enter follows the link under the cursor on kitty-protocol
    // terminals (legacy terminals can't tell it from Enter).
    if ctx.editor_active()
        && let InputEvent::Key(key) = event
        && key.code == KeyCode::Enter
        && key.modifiers.contains(KeyModifiers::CONTROL)
    {
        return Classification {
            flash: None,
            cancel_leader,
            intent: EditorIntent::FollowLink,
        };
    }

    // Shortcut tier: resolve the bound action (if any) to an intent, and
    // compute the footer chord flash. The match *yields* instead of
    // returning so `flash` has a single owner: the one `done` constructor
    // below moves it into whichever classification wins.
    let mut flash = None;
    let mut shortcut_intent = None;
    if let InputEvent::Key(key) = event
        && let Some(combo) = key_event_to_combo(key)
    {
        let is_fkey = combo.key.is_fkey();
        let action = bindings.get_action(&combo);
        // Name the action when the chord resolves to one; fall back to the raw
        // chord when it does not. A bare "Ctrl&K" only answers "what did I
        // press"; "Search notes" answers "what did it do", and the raw chord was
        // never the interesting half for a binding the user chose. Unbound
        // chords keep the echo — there is nothing else to say about them.
        //
        // Handlers that report their own outcome (a yank's "path copied", a
        // paste's "pasted") overwrite this: the tier's flash is applied first,
        // then the intent runs.
        //
        // The leader gateway is exempt either way — its affordance is the
        // pending sequence and the which-key overlay.
        if action != Some(ActionShortcuts::Leader) && (is_fkey || combo.is_letter_chord()) {
            flash = Some(match &action {
                Some(a) => a.label(),
                None => combo.to_string(),
            });
        }
        shortcut_intent = match action {
            Some(ActionShortcuts::OpenCommandPalette) => Some(EditorIntent::ToggleOverlay {
                kind: OverlayKind::CommandPalette,
                open: OverlayOpen::CommandPalette,
            }),
            Some(ActionShortcuts::Leader) => {
                // The gateway works in every context, including mid-typing —
                // but not while an overlay owns input.
                Some(if ctx.overlay.is_none() {
                    EditorIntent::LeaderStart
                } else {
                    EditorIntent::Consume
                })
            }
            Some(ActionShortcuts::ToggleSidebar) => Some(EditorIntent::Op(EditorOp::ToggleDrawer)),
            Some(ActionShortcuts::FocusSidebar) => {
                // No-op while an overlay owns input, but still consume the key.
                Some(if ctx.overlay.is_none() {
                    EditorIntent::Op(EditorOp::FocusLeft)
                } else {
                    EditorIntent::Consume
                })
            }
            Some(ActionShortcuts::FocusEditor) => Some(if ctx.overlay.is_none() {
                EditorIntent::Op(EditorOp::FocusRight)
            } else {
                EditorIntent::Consume
            }),
            Some(ActionShortcuts::NewJournal) => Some(EditorIntent::Op(EditorOp::OpenJournal)),
            Some(ActionShortcuts::SearchNotes) => Some(EditorIntent::ToggleOverlay {
                kind: OverlayKind::NoteBrowser,
                open: OverlayOpen::SearchBrowser,
            }),
            Some(ActionShortcuts::OpenNote) => Some(EditorIntent::ToggleOverlay {
                kind: OverlayKind::NoteBrowser,
                open: OverlayOpen::FileFinder,
            }),
            Some(ActionShortcuts::FileOperations) if ctx.editor_active() => {
                Some(EditorIntent::Op(EditorOp::ShowFileOps))
            }
            Some(ActionShortcuts::FollowLink) if ctx.editor_active() => {
                Some(EditorIntent::FollowLink)
            }
            Some(ActionShortcuts::ToggleQueryPanel) => {
                Some(EditorIntent::Op(EditorOp::ToggleQueryPanel))
            }
            Some(ActionShortcuts::OpenFileBrowser) => {
                // Open (or switch to) the FILES view — never hides the drawer;
                // ToggleSidebar is the on/off switch. Always reveal: with FILES
                // already open this is the "where is my note" gesture.
                Some(EditorIntent::Op(EditorOp::OpenFileBrowserReveal))
            }
            Some(ActionShortcuts::OpenSavedSearches) => Some(EditorIntent::ToggleOverlay {
                kind: OverlayKind::SavedSearches,
                open: OverlayOpen::SavedSearches,
            }),
            Some(ActionShortcuts::OpenAsk) => Some(EditorIntent::Op(EditorOp::OpenAsk)),
            // Deliberately produces NO intent, so the chord is never consumed
            // here and always reaches whatever has focus. A list surface claims
            // it inside `SearchList` and yanks the selected row's target; the
            // editor claims it as redo. The binding exists for the other two
            // things a hand-rolled pre-check could never give it — rebinding and
            // a help-dialog entry.
            Some(ActionShortcuts::YankRow) => None,
            Some(ActionShortcuts::OpenSortDialog) => {
                // Sort applies only when a list is focused (the drawer's
                // Find / Files views). When the editor is focused, do NOT
                // consume — fall through (`None`) so the key reaches it
                // (e.g. Ctrl+R is redo in the nvim editor).
                if ctx.focused == PanelKind::Drawer && ctx.overlay.is_none() {
                    Some(match ctx.drawer_view {
                        DrawerView::Find => EditorIntent::OpenOverlay(OverlayOpen::SortQuery),
                        DrawerView::Files => EditorIntent::OpenOverlay(OverlayOpen::SortSidebar),
                        _ => EditorIntent::Consume,
                    })
                } else {
                    None
                }
            }
            Some(ActionShortcuts::SaveCurrentQuery) => {
                // Whether there is anything to save is executor state (the
                // live query text); the key is consumed either way.
                Some(EditorIntent::Op(EditorOp::SaveCurrentQuery))
            }
            Some(ActionShortcuts::SwitchWorkspace) => {
                Some(EditorIntent::OpenOverlay(OverlayOpen::WorkspaceSwitcher))
            }
            Some(ActionShortcuts::QuickNote) => Some(if ctx.overlay.is_none() {
                EditorIntent::OpenOverlay(OverlayOpen::QuickNote)
            } else {
                EditorIntent::Consume
            }),
            Some(ActionShortcuts::FindInBuffer) if ctx.editor_active() => {
                Some(EditorIntent::Op(EditorOp::FindInBuffer))
            }
            Some(ActionShortcuts::ReplaceInBuffer) if ctx.editor_active() => {
                Some(EditorIntent::Op(EditorOp::ReplaceInBuffer))
            }
            Some(ActionShortcuts::Text(
                action @ (TextAction::Bold | TextAction::Italic | TextAction::Strikethrough),
            )) if ctx.editor_active() => Some(EditorIntent::Op(EditorOp::ApplyText(action))),
            _ => {
                if is_fkey {
                    // F1 opens the help modal. Over the Find panel it surfaces
                    // query syntax instead of the flat key-bindings help. All
                    // F-keys are consumed and never forwarded to the editor.
                    if combo.key == KeyStrike::F1 && combo.modifiers.is_empty() {
                        Some(EditorIntent::OpenOverlay(if ctx.find_panel_focused() {
                            OverlayOpen::QueryHelp
                        } else {
                            OverlayOpen::Help
                        }))
                    } else {
                        Some(EditorIntent::Consume)
                    }
                } else {
                    None
                }
            }
        };
    }

    // Single constructor: moves `flash` into the winning classification.
    // Every call site diverges, so the FnOnce closure is used at most once.
    let done = move |intent| Classification {
        flash,
        cancel_leader,
        intent,
    };

    if let Some(intent) = shortcut_intent {
        return done(intent);
    }

    // An open overlay intercepts all remaining input ahead of the panels.
    if ctx.overlay.is_some() {
        return done(EditorIntent::Overlay);
    }

    if matches!(event, InputEvent::Mouse(_)) {
        // A double-click in the editor follows the link under it, exactly as
        // Ctrl+N does — same intent, same executor, one follow path. The
        // classifier cannot hit-test panels (that is `PanelSet`'s job, and why
        // `Mouse` exists at all), so it leans on focus: the first press of the
        // pair already focused whatever column it landed in.
        if ctx.double_click && ctx.editor_active() {
            return done(EditorIntent::FollowLink);
        }
        return done(EditorIntent::Mouse);
    }

    // Vim Normal mode: bare Space is a second leader gateway, but only with
    // an empty pending state so it never shadows Space as a motion/operator
    // argument. Insert/Visual and the other backends keep Space typing a
    // space (`space_leads` is false for those states).
    if ctx.editor_active()
        && (!ctx.leader_pending || cancel_leader)
        && let InputEvent::Key(key) = event
        && key.code == KeyCode::Char(' ')
        && key.modifiers.is_empty()
        && ctx.space_leads
    {
        return done(EditorIntent::LeaderStart);
    }

    // Tab / Shift-Tab cycle panel focus (spec §2). The focused panel gets
    // first crack — the Query panel's autocomplete accepts on Tab — and the
    // editor keeps Tab for indentation.
    if ctx.focused != PanelKind::Editor
        && let InputEvent::Key(key) = event
        && matches!(key.code, KeyCode::Tab | KeyCode::BackTab)
    {
        return done(EditorIntent::Panel {
            fallback: PanelFallback::FocusCycle(if key.code == KeyCode::Tab {
                CycleDir::Right
            } else {
                CycleDir::Left
            }),
        });
    }

    // The drawer's FIND view gets first crack (its autocomplete popup may
    // consume Esc); on an unhandled Esc it yields focus back to the editor.
    if ctx.find_panel_focused()
        && let InputEvent::Key(key) = event
        && key.code == KeyCode::Esc
    {
        return done(EditorIntent::Panel {
            fallback: PanelFallback::FocusEditor,
        });
    }

    done(EditorIntent::Panel {
        fallback: PanelFallback::None,
    })
}

#[cfg(test)]
mod tests {
    use super::*;
    use ratatui::crossterm::event::{KeyCode, KeyEvent, KeyModifiers, MouseEvent, MouseEventKind};

    fn bindings() -> KeyBindings {
        let mut kb = KeyBindings::empty();
        kb.batch_add()
            .with_ctrl()
            .add(KeyStrike::KeyP, ActionShortcuts::OpenCommandPalette)
            .add(KeyStrike::KeyK, ActionShortcuts::SearchNotes)
            .add(KeyStrike::KeyG, ActionShortcuts::Leader)
            .add(KeyStrike::KeyT, ActionShortcuts::ToggleSidebar)
            .add(KeyStrike::KeyR, ActionShortcuts::OpenSortDialog)
            .add(KeyStrike::KeyH, ActionShortcuts::FocusSidebar)
            .add(KeyStrike::KeyB, ActionShortcuts::Text(TextAction::Bold))
            .add(KeyStrike::KeyN, ActionShortcuts::FollowLink)
            .add(KeyStrike::KeyW, ActionShortcuts::QuickNote);
        kb.batch_add()
            .add(KeyStrike::F2, ActionShortcuts::FileOperations);
        kb
    }

    /// Editor focused, nothing pending — the common ctx.
    fn ctx() -> InputCtx {
        InputCtx {
            overlay: None,
            leader_pending: false,
            focused: PanelKind::Editor,
            drawer_view: DrawerView::Files,
            space_leads: false,
            claim: EditorClaim::None,
            double_click: false,
        }
    }

    /// The common ctx with the find bar holding the **editor claim**.
    fn ctx_find_bar() -> InputCtx {
        InputCtx {
            claim: EditorClaim::FindBar,
            ..ctx()
        }
    }

    /// The common ctx with the press completing a double-click. Whether it
    /// *is* one is `ClickRun`'s question, answered before this snapshot.
    fn ctx_double() -> InputCtx {
        InputCtx {
            double_click: true,
            ..ctx()
        }
    }

    /// A left press. Coordinates are irrelevant to the classifier — it never
    /// hit-tests; the screen decided the cell was the editor's before it fed
    /// the click run.
    fn press() -> InputEvent {
        use ratatui::crossterm::event::{MouseButton, MouseEvent, MouseEventKind};
        InputEvent::Mouse(MouseEvent {
            kind: MouseEventKind::Down(MouseButton::Left),
            column: 1,
            row: 1,
            modifiers: KeyModifiers::NONE,
        })
    }

    fn key(code: KeyCode, mods: KeyModifiers) -> InputEvent {
        InputEvent::Key(KeyEvent::new(code, mods))
    }

    fn ctrl(c: char) -> InputEvent {
        key(KeyCode::Char(c), KeyModifiers::CONTROL)
    }

    fn plain(c: char) -> InputEvent {
        key(KeyCode::Char(c), KeyModifiers::NONE)
    }

    fn classify_it(event: &InputEvent, ctx: &InputCtx) -> Classification {
        classify(event, &bindings(), ctx)
    }

    // ---- editor claim -----------------------------------------

    /// The bug that motivated the claim: with the editor focused — which is
    /// exactly the state when the find bar is open — a formatting chord
    /// classified as a buffer edit and the bar never saw the key. Typing a
    /// find pattern and pressing Ctrl+B emboldened the note.
    #[test]
    fn a_claim_blocks_a_buffer_edit() {
        let ev = key(KeyCode::Char('b'), KeyModifiers::CONTROL);
        assert_eq!(
            classify_it(&ev, &ctx()).intent,
            EditorIntent::Op(EditorOp::ApplyText(TextAction::Bold)),
            "without a claim the chord still bolds"
        );
        assert_eq!(
            classify_it(&ev, &ctx_find_bar()).intent,
            EditorIntent::Panel {
                fallback: PanelFallback::None
            },
            "under a claim it is delivered to the holder instead"
        );
    }

    /// Navigation is not a buffer edit — the drawer, panel focus and the
    /// palette stay reachable while searching.
    #[test]
    fn a_claim_leaves_navigation_alone() {
        for ev in [
            key(KeyCode::Char('t'), KeyModifiers::CONTROL),
            key(KeyCode::Char('p'), KeyModifiers::CONTROL),
        ] {
            assert_eq!(
                classify_it(&ev, &ctx_find_bar()).intent,
                classify_it(&ev, &ctx()).intent,
                "a claim must not swallow navigation"
            );
        }
    }

    /// A paste aimed at the replace field used to land in the buffer behind
    /// the bar; the fix lived inside `paste_text`. It is a classification now.
    #[test]
    fn a_find_bar_claim_blocks_the_paste_tiers() {
        for ev in [
            InputEvent::Paste("hi".into()),
            key(KeyCode::Char('v'), KeyModifiers::CONTROL),
            key(KeyCode::Enter, KeyModifiers::CONTROL),
        ] {
            assert_eq!(
                classify_it(&ev, &ctx_find_bar()).intent,
                EditorIntent::Panel {
                    fallback: PanelFallback::None
                },
                "paste, image probe and follow-link all belong to the bar"
            );
        }
    }

    /// Space is a character in a find pattern, not the leader gateway. This
    /// used to be enforced by making `space_leads()` lie while the bar was
    /// open — the smuggled fact the claim replaces.
    #[test]
    fn a_find_bar_claim_blocks_the_space_leader() {
        let ev = key(KeyCode::Char(' '), KeyModifiers::NONE);
        let vim_ctx = InputCtx {
            space_leads: true,
            ..ctx()
        };
        assert_eq!(classify_it(&ev, &vim_ctx).intent, EditorIntent::LeaderStart);
        let vim_bar = InputCtx {
            space_leads: true,
            ..ctx_find_bar()
        };
        assert_eq!(
            classify_it(&ev, &vim_bar).intent,
            EditorIntent::Panel {
                fallback: PanelFallback::None
            }
        );
    }

    /// A click would move the cursor off the current match and overwrite the
    /// selection marking it — reachable as a panic before this. Scrolling is
    /// allowed: it moves the viewport, not the cursor.
    #[test]
    fn a_find_bar_claim_blocks_clicks_but_not_scrolling() {
        use ratatui::crossterm::event::{MouseButton, MouseEvent, MouseEventKind};
        let at = |kind| {
            InputEvent::Mouse(MouseEvent {
                kind,
                column: 1,
                row: 1,
                modifiers: KeyModifiers::NONE,
            })
        };
        assert_eq!(
            classify_it(
                &at(MouseEventKind::Down(MouseButton::Left)),
                &ctx_find_bar()
            )
            .intent,
            EditorIntent::Consume,
            "a click reaches nothing while the bar holds the claim"
        );
        assert_eq!(
            classify_it(&at(MouseEventKind::ScrollUp), &ctx_find_bar()).intent,
            EditorIntent::Mouse,
            "scrolling still works"
        );
    }

    // ── Following a link with the mouse (see `click_run`) ───────────────────

    /// A press classifies as an ordinary mouse event whatever it lands on.
    /// Following is the *second* press of a pair, never the first — this is
    /// the regression that a stray click can no longer navigate.
    #[test]
    fn a_single_press_only_reaches_the_editor() {
        assert_eq!(classify_it(&press(), &ctx()).intent, EditorIntent::Mouse);
    }

    /// The whole point: a double-click means the same thing as Ctrl+N, so it
    /// produces the same intent and runs through the same executor.
    #[test]
    fn a_double_click_follows_the_link_under_it() {
        assert_eq!(
            classify_it(&press(), &ctx_double()).intent,
            EditorIntent::FollowLink,
            "the same intent Ctrl+N produces"
        );
        assert_eq!(
            classify_it(&key(KeyCode::Char('n'), KeyModifiers::CONTROL), &ctx()).intent,
            EditorIntent::FollowLink,
            "and Ctrl+N still produces it"
        );
    }

    /// The classifier cannot hit-test panels, so it leans on focus — which the
    /// *first* press of the pair set. Double-clicking a row in the drawer must
    /// not follow whatever the editor's cursor happens to sit on.
    #[test]
    fn a_double_click_outside_the_editor_is_an_ordinary_click() {
        let drawer = InputCtx {
            focused: PanelKind::Drawer,
            ..ctx_double()
        };
        assert_eq!(classify_it(&press(), &drawer).intent, EditorIntent::Mouse);
    }

    /// An overlay owns the input ahead of the panels, so a double-click under
    /// one is the overlay's, not a follow against the buffer behind it.
    #[test]
    fn an_overlay_outranks_a_double_click() {
        let covered = InputCtx {
            overlay: Some(OverlayKind::NoteBrowser),
            ..ctx_double()
        };
        assert_eq!(
            classify_it(&press(), &covered).intent,
            EditorIntent::Overlay
        );
    }

    /// Same intent, different origin, different answer. Ctrl+Enter belongs to
    /// the bar (it is a text field); the press underneath a double-click does
    /// not, and the bar has no way to represent the cursor move it implies.
    #[test]
    fn a_find_bar_claim_swallows_a_double_click_but_takes_ctrl_enter() {
        let bar_double = InputCtx {
            double_click: true,
            ..ctx_find_bar()
        };
        assert_eq!(
            classify_it(&press(), &bar_double).intent,
            EditorIntent::Consume,
            "a follow that arrived as a click is still a click"
        );
        assert_eq!(
            classify_it(&key(KeyCode::Enter, KeyModifiers::CONTROL), &ctx_find_bar()).intent,
            EditorIntent::Panel {
                fallback: PanelFallback::None
            },
            "but a follow that arrived as a key is delivered to the bar"
        );
    }

    /// The claim filter has three holders, not two. A mouse-origin follow
    /// degrades to whatever a plain press does under the holder — which for the
    /// popup means being delivered, so it can dismiss itself and place the
    /// cursor. Consuming it instead left the popup open over a note that had
    /// navigated away.
    #[test]
    fn an_autocomplete_claim_turns_a_double_click_back_into_a_press() {
        let popup = InputCtx {
            claim: EditorClaim::Autocomplete,
            double_click: true,
            ..ctx()
        };
        assert_eq!(classify_it(&press(), &popup).intent, EditorIntent::Mouse);
        assert_eq!(
            classify_it(&key(KeyCode::Char('n'), KeyModifiers::CONTROL), &popup).intent,
            EditorIntent::FollowLink,
            "the popup does not own the keyboard follow"
        );
    }

    /// The asymmetry that makes the claim an enum rather than a bool: the
    /// popup wants the events the bar blocks. A click should dismiss it and
    /// place the cursor.
    #[test]
    fn an_autocomplete_claim_blocks_only_buffer_edits() {
        let popup = InputCtx {
            claim: EditorClaim::Autocomplete,
            ..ctx()
        };
        assert_eq!(
            classify_it(&InputEvent::Paste("hi".into()), &popup).intent,
            EditorIntent::EditorPaste,
            "the popup does not own pastes"
        );
        assert_eq!(
            classify_it(&key(KeyCode::Char('b'), KeyModifiers::CONTROL), &popup).intent,
            EditorIntent::Panel {
                fallback: PanelFallback::None
            },
            "but a buffer edit still loses to any holder"
        );
    }

    /// A pending leader sequence outranks a claim (spec §8a).
    #[test]
    fn the_leader_outranks_a_claim() {
        let ev = key(KeyCode::Char('x'), KeyModifiers::NONE);
        let pending = InputCtx {
            leader_pending: true,
            ..ctx_find_bar()
        };
        assert!(matches!(
            classify_it(&ev, &pending).intent,
            EditorIntent::LeaderKey(_)
        ));
    }

    // ---- paste tiers -----------------------------------------------------

    #[test]
    fn bracketed_paste_in_editor_is_editor_paste() {
        let c = classify_it(&InputEvent::Paste("hi".into()), &ctx());
        assert_eq!(c.intent, EditorIntent::EditorPaste);
    }

    #[test]
    fn bracketed_paste_with_overlay_routes_to_overlay() {
        let mut cx = ctx();
        cx.overlay = Some(OverlayKind::NoteBrowser);
        let c = classify_it(&InputEvent::Paste("hi".into()), &cx);
        assert_eq!(c.intent, EditorIntent::Overlay);
    }

    #[test]
    fn bracketed_paste_drawer_focused_goes_to_panel() {
        let mut cx = ctx();
        cx.focused = PanelKind::Drawer;
        let c = classify_it(&InputEvent::Paste("hi".into()), &cx);
        assert_eq!(
            c.intent,
            EditorIntent::Panel {
                fallback: PanelFallback::None
            }
        );
    }

    #[test]
    fn ctrl_v_in_editor_is_a_bare_image_probe() {
        // The probe carries no precomputed fallback: the executor
        // reclassifies the tail only when the clipboard holds no image.
        let c = classify_it(&ctrl('v'), &ctx());
        assert_eq!(c.intent, EditorIntent::ImageProbe);
        assert_eq!(c.flash, None, "flash belongs to the no-image tail only");
    }

    #[test]
    fn ctrl_v_no_image_tail_reaches_panel_with_a_flash() {
        // The executor's no-image path: classify_tail against post-probe
        // state (leader already cancelled → cancel_leader = false). Ctrl+V
        // is unbound, so it reaches the focused panel (the editor's own
        // paste), flashing the chord on the way through the shortcut tier.
        let c = classify_tail(&ctrl('v'), &bindings(), &ctx(), false);
        assert_eq!(
            c.intent,
            EditorIntent::Panel {
                fallback: PanelFallback::None
            }
        );
        assert!(c.flash.is_some());
        assert!(!c.cancel_leader, "the outer probe already owned the cancel");
    }

    #[test]
    fn leader_pending_ctrl_v_cancels_leader_then_probes_image() {
        // §8a ctrl-chord exception: the chord cancels the pending sequence
        // and dispatches normally — for Ctrl+V that is the image probe, so
        // the cancel rides on the probe classification (the leader must die
        // whether or not the clipboard holds an image), and exactly once:
        // the no-image reclassification must not re-cancel.
        let mut cx = ctx();
        cx.leader_pending = true;
        let c = classify_it(&ctrl('v'), &cx);
        assert!(c.cancel_leader);
        assert_eq!(c.intent, EditorIntent::ImageProbe);
    }

    #[test]
    fn leader_pending_bracketed_paste_cancels_leader_then_pastes() {
        // A paste payload is not a key the sequence can consume: the
        // ctrl-chord rule applied to a non-key event — cancel, then paste.
        let mut cx = ctx();
        cx.leader_pending = true;
        let c = classify_it(&InputEvent::Paste("hi".into()), &cx);
        assert!(c.cancel_leader);
        assert_eq!(c.intent, EditorIntent::EditorPaste);
    }

    #[test]
    fn leader_pending_ctrl_enter_feeds_leader() {
        // Enter is not a Char ctrl-chord, so no exception applies: the
        // pending sequence owns the key (§8a) ahead of follow-link.
        let mut cx = ctx();
        cx.leader_pending = true;
        let c = classify_it(&key(KeyCode::Enter, KeyModifiers::CONTROL), &cx);
        assert_eq!(
            c.intent,
            EditorIntent::LeaderKey(KeyEvent::new(KeyCode::Enter, KeyModifiers::CONTROL))
        );
        assert!(!c.cancel_leader);
    }

    #[test]
    fn ctrl_enter_in_editor_follows_link() {
        let c = classify_it(&key(KeyCode::Enter, KeyModifiers::CONTROL), &ctx());
        assert_eq!(c.intent, EditorIntent::FollowLink);
    }

    // ---- leader tier -----------------------------------------------------

    #[test]
    fn leader_pending_plain_key_feeds_leader() {
        let mut cx = ctx();
        cx.leader_pending = true;
        let c = classify_it(&plain('f'), &cx);
        assert_eq!(
            c.intent,
            EditorIntent::LeaderKey(KeyEvent::new(KeyCode::Char('f'), KeyModifiers::NONE))
        );
        assert!(!c.cancel_leader);
    }

    #[test]
    fn leader_pending_with_overlay_cancels_and_routes_to_overlay() {
        let mut cx = ctx();
        cx.leader_pending = true;
        cx.overlay = Some(OverlayKind::Dialog);
        let c = classify_it(&plain('f'), &cx);
        assert!(c.cancel_leader);
        assert_eq!(c.intent, EditorIntent::Overlay);
    }

    #[test]
    fn leader_pending_ctrl_chord_cancels_then_dispatches() {
        let mut cx = ctx();
        cx.leader_pending = true;
        let c = classify_it(&ctrl('p'), &cx);
        assert!(c.cancel_leader);
        assert_eq!(
            c.intent,
            EditorIntent::ToggleOverlay {
                kind: OverlayKind::CommandPalette,
                open: OverlayOpen::CommandPalette
            }
        );
    }

    // ---- shortcut tier ---------------------------------------------------

    #[test]
    fn command_palette_chord_toggles_regardless_of_open_state() {
        // Same intent open or closed — the executor dismisses when the kind
        // is already active.
        let c = classify_it(&ctrl('p'), &ctx());
        assert_eq!(
            c.intent,
            EditorIntent::ToggleOverlay {
                kind: OverlayKind::CommandPalette,
                open: OverlayOpen::CommandPalette
            }
        );
        assert!(c.flash.is_some());

        let mut cx = ctx();
        cx.overlay = Some(OverlayKind::CommandPalette);
        let c = classify_it(&ctrl('p'), &cx);
        assert_eq!(
            c.intent,
            EditorIntent::ToggleOverlay {
                kind: OverlayKind::CommandPalette,
                open: OverlayOpen::CommandPalette
            }
        );
    }

    #[test]
    fn leader_gateway_starts_sequence_without_flash() {
        let c = classify_it(&ctrl('g'), &ctx());
        assert_eq!(c.intent, EditorIntent::LeaderStart);
        assert_eq!(c.flash, None);
    }

    #[test]
    fn leader_gateway_with_overlay_is_consumed_noop() {
        let mut cx = ctx();
        cx.overlay = Some(OverlayKind::NoteBrowser);
        let c = classify_it(&ctrl('g'), &cx);
        assert_eq!(c.intent, EditorIntent::Consume);
    }

    #[test]
    fn focus_sidebar_with_overlay_is_consumed_noop() {
        let mut cx = ctx();
        cx.overlay = Some(OverlayKind::NoteBrowser);
        let c = classify_it(&ctrl('h'), &cx);
        assert_eq!(c.intent, EditorIntent::Consume);
    }

    #[test]
    fn toggle_drawer_chord_is_action() {
        let c = classify_it(&ctrl('t'), &ctx());
        assert_eq!(c.intent, EditorIntent::Op(EditorOp::ToggleDrawer));
    }

    #[test]
    fn quick_note_opens_dialog_only_without_overlay() {
        let c = classify_it(&ctrl('w'), &ctx());
        assert_eq!(c.intent, EditorIntent::OpenOverlay(OverlayOpen::QuickNote));

        let mut cx = ctx();
        cx.overlay = Some(OverlayKind::Dialog);
        let c = classify_it(&ctrl('w'), &cx);
        assert_eq!(c.intent, EditorIntent::Consume);
    }

    #[test]
    fn text_style_chord_needs_active_editor() {
        let c = classify_it(&ctrl('b'), &ctx());
        assert_eq!(
            c.intent,
            EditorIntent::Op(EditorOp::ApplyText(TextAction::Bold))
        );

        // Drawer focused: the guard fails and the chord falls through the
        // match to the focused panel.
        let mut cx = ctx();
        cx.focused = PanelKind::Drawer;
        let c = classify_it(&ctrl('b'), &cx);
        assert_eq!(
            c.intent,
            EditorIntent::Panel {
                fallback: PanelFallback::None
            }
        );
    }

    #[test]
    fn sort_dialog_targets_the_focused_drawer_view() {
        let mut cx = ctx();
        cx.focused = PanelKind::Drawer;
        cx.drawer_view = DrawerView::Find;
        let c = classify_it(&ctrl('r'), &cx);
        assert_eq!(c.intent, EditorIntent::OpenOverlay(OverlayOpen::SortQuery));

        cx.drawer_view = DrawerView::Files;
        let c = classify_it(&ctrl('r'), &cx);
        assert_eq!(
            c.intent,
            EditorIntent::OpenOverlay(OverlayOpen::SortSidebar)
        );

        // A drawer view without a sortable list consumes the chord.
        cx.drawer_view = DrawerView::Tags;
        let c = classify_it(&ctrl('r'), &cx);
        assert_eq!(c.intent, EditorIntent::Consume);
    }

    #[test]
    fn sort_dialog_chord_falls_through_when_editor_focused() {
        // Ctrl+R must reach the editor (redo in the nvim backend).
        let c = classify_it(&ctrl('r'), &ctx());
        assert_eq!(
            c.intent,
            EditorIntent::Panel {
                fallback: PanelFallback::None
            }
        );
    }

    #[test]
    fn f1_opens_help_or_query_help_by_focus() {
        let c = classify_it(&key(KeyCode::F(1), KeyModifiers::NONE), &ctx());
        assert_eq!(c.intent, EditorIntent::OpenOverlay(OverlayOpen::Help));

        let mut cx = ctx();
        cx.focused = PanelKind::Drawer;
        cx.drawer_view = DrawerView::Find;
        let c = classify_it(&key(KeyCode::F(1), KeyModifiers::NONE), &cx);
        assert_eq!(c.intent, EditorIntent::OpenOverlay(OverlayOpen::QueryHelp));
    }

    #[test]
    fn unbound_fkeys_are_sunk_with_a_flash() {
        let c = classify_it(&key(KeyCode::F(9), KeyModifiers::NONE), &ctx());
        assert_eq!(c.intent, EditorIntent::Consume);
        assert!(c.flash.is_some());
    }

    /// A bound chord flashes what it *does*, not which keys were pressed — the
    /// user chose the binding, so the chord is the half they already know.
    #[test]
    fn a_bound_chord_flashes_the_action_label() {
        let c = classify_it(&ctrl('k'), &ctx());
        assert_eq!(
            c.flash.as_deref(),
            Some(ActionShortcuts::SearchNotes.label().as_str())
        );
    }

    /// An unbound chord has no action to name, so the echo stays — it is the
    /// only answer available to "what did I just press?".
    #[test]
    fn an_unbound_chord_still_flashes_the_raw_chord() {
        // Ctrl+Y is deliberately absent from this test's bindings.
        let c = classify_it(&ctrl('y'), &ctx());
        let combo =
            key_event_to_combo(&KeyEvent::new(KeyCode::Char('y'), KeyModifiers::CONTROL)).unwrap();
        assert_eq!(c.flash.as_deref(), Some(combo.to_string().as_str()));
    }

    #[test]
    fn high_fkeys_are_sunk_like_the_rest() {
        // "All F-keys are consumed and never forwarded to the editor" —
        // including F13+ (KeyStrike defines up to F25); the shared
        // KeyStrike::is_fkey predicate keeps this in step with the
        // binding validator.
        let c = classify_it(&key(KeyCode::F(13), KeyModifiers::NONE), &ctx());
        assert_eq!(c.intent, EditorIntent::Consume);
    }

    #[test]
    fn bound_fkey_dispatches_when_guard_holds_and_sinks_when_not() {
        // F2 = FileOperations, guarded on the active editor.
        let c = classify_it(&key(KeyCode::F(2), KeyModifiers::NONE), &ctx());
        assert_eq!(c.intent, EditorIntent::Op(EditorOp::ShowFileOps));

        let mut cx = ctx();
        cx.focused = PanelKind::Drawer;
        let c = classify_it(&key(KeyCode::F(2), KeyModifiers::NONE), &cx);
        assert_eq!(c.intent, EditorIntent::Consume);
    }

    // ---- lower tiers -----------------------------------------------------

    #[test]
    fn overlay_intercepts_unbound_keys() {
        let mut cx = ctx();
        cx.overlay = Some(OverlayKind::SavedSearches);
        let c = classify_it(&plain('x'), &cx);
        assert_eq!(c.intent, EditorIntent::Overlay);
    }

    #[test]
    fn mouse_events_take_the_hit_test_path() {
        let ev = InputEvent::Mouse(MouseEvent {
            kind: MouseEventKind::Moved,
            column: 3,
            row: 4,
            modifiers: KeyModifiers::NONE,
        });
        let c = classify_it(&ev, &ctx());
        assert_eq!(c.intent, EditorIntent::Mouse);
    }

    #[test]
    fn vim_space_starts_leader_only_when_it_leads() {
        let mut cx = ctx();
        cx.space_leads = true;
        let c = classify_it(&plain(' '), &cx);
        assert_eq!(c.intent, EditorIntent::LeaderStart);

        cx.space_leads = false;
        let c = classify_it(&plain(' '), &cx);
        assert_eq!(
            c.intent,
            EditorIntent::Panel {
                fallback: PanelFallback::None
            }
        );
    }

    #[test]
    fn tab_cycles_focus_when_a_non_editor_panel_passes() {
        let mut cx = ctx();
        cx.focused = PanelKind::Drawer;
        let c = classify_it(&key(KeyCode::Tab, KeyModifiers::NONE), &cx);
        assert_eq!(
            c.intent,
            EditorIntent::Panel {
                fallback: PanelFallback::FocusCycle(CycleDir::Right)
            }
        );

        let c = classify_it(&key(KeyCode::BackTab, KeyModifiers::SHIFT), &cx);
        assert_eq!(
            c.intent,
            EditorIntent::Panel {
                fallback: PanelFallback::FocusCycle(CycleDir::Left)
            }
        );
    }

    #[test]
    fn editor_keeps_tab_for_indentation() {
        let c = classify_it(&key(KeyCode::Tab, KeyModifiers::NONE), &ctx());
        assert_eq!(
            c.intent,
            EditorIntent::Panel {
                fallback: PanelFallback::None
            }
        );
    }

    #[test]
    fn find_view_yields_focus_to_editor_on_unhandled_esc() {
        let mut cx = ctx();
        cx.focused = PanelKind::Drawer;
        cx.drawer_view = DrawerView::Find;
        let c = classify_it(&key(KeyCode::Esc, KeyModifiers::NONE), &cx);
        assert_eq!(
            c.intent,
            EditorIntent::Panel {
                fallback: PanelFallback::FocusEditor
            }
        );

        // Any other unhandled key propagates as-is.
        let c = classify_it(&plain('x'), &cx);
        assert_eq!(
            c.intent,
            EditorIntent::Panel {
                fallback: PanelFallback::None
            }
        );
    }
}