strop-engine 0.46.0

//! Normal mode (0016): the machine walks keys to typed actions; this
//! module dispatches them. Siblings by responsibility: `execute` (the
//! operator engine + editing entries), `search`, `preview`, `pending`
//! (the prompt effects), `ex` (the `:` line), `motions`.

mod ex;
mod execute;
mod motions;
mod pending;
mod preview;
mod search;

use strop_grammar::{self as grammar, Parse};

use super::Editor;
use strop_core::frontend_input::Key;

/// The ex vocabulary (completion + `run_ex` dispatch reads the same
/// list — one table, no drift).
pub(crate) const EX_COMMANDS: &[(&str, &str)] = &[
    ("theme", "choose a built-in interface palette"),
    ("terminal", "local interactive shell or explicit command"),
    (
        "terminal-local",
        "explicit local shell even from an SSH/container context",
    ),
    (
        "terminal-stop",
        "stop the current terminal and retain its output",
    ),
    (
        "terminal-paste",
        "confirm the current terminal's held multiline/control paste",
    ),
    (
        "terminal-paste-cancel",
        "discard the current terminal's held paste",
    ),
    (
        "terminal-refresh",
        "reinstall the latest output into an inspected terminal snapshot",
    ),
    ("w", "write"),
    ("w!", "write, force (file changed on disk)"),
    ("wq!", "write forced + quit"),
    ("q", "quit"),
    ("q!", "quit, force"),
    ("wq", "write + quit"),
    ("e", "edit file"),
    ("e!", "edit file, force"),
    ("vs", "split vertical"),
    ("vsplit", "split vertical"),
    ("sp", "split horizontal"),
    ("split", "split horizontal"),
    ("help", "help buffer"),
    ("h", "help buffer"),
    ("jumps", "open the jumplist picker"),
    ("!", "run shell command"),
    ("view", "open readonly"),
    ("set", "readonly option: ro/noro"),
    ("noh", "clear the persistent search highlight"),
    ("tail", "remote tail: :tail [BYTES] URI"),
    ("range", "remote range: :range START BYTES URI"),
    ("follow", "follow remote EOF: :follow [URI]"),
    ("unfollow", "stop remote following"),
    ("browse", "browse remote directory: :browse [URI]"),
    ("filter", "filter remote directory by literal filename"),
    (
        "remote",
        "choose remote destination; edit/verify/root/home/connect/disconnect/clear/list",
    ),
    ("trust", "authorize the pending endpoint/project command"),
    (
        "explain",
        "why: workspaces, LSP readiness, effective config",
    ),
    ("containers", "attach to a running container (read-only)"),
    (
        "container-worker",
        "authorize a verified worker for the attached container",
    ),
    ("format", "format the buffer through the language server"),
    ("rename", "rename the symbol under the cursor: :rename NEW"),
    ("symbols", "open the document symbols picker"),
    ("undo-change", "undo the last applied change plan"),
    (
        "save-change",
        "save files changed by the latest reviewed operation",
    ),
    ("apply-change", "apply the prepared proposal"),
    ("cancel-change", "cancel the prepared proposal"),
    (
        "select-next",
        "select the next occurrence of the word or selection",
    ),
    ("select-all", "select all occurrences in buffer"),
    ("select-skip", "skip the next occurrence candidate"),
    ("select-pop", "drop the last-added occurrence"),
    ("search-options", "choose hidden and ignored search policy"),
    ("tab-size", "choose indentation width: N or auto"),
    (
        "indent-style",
        "choose indentation style: spaces, tabs or auto",
    ),
    (
        "collection",
        "source, expand or contract the excerpt at the caret",
    ),
    (
        "recover",
        "draft recovery: list, restore N, discard N, consent remote|off",
    ),
    ("qa", "quit all (fails on unsaved; :qa! discards)"),
    ("qall", "quit all (fails on unsaved; :qall! discards)"),
];

impl Editor {
    pub(crate) fn feed_normal(&mut self, key: Key) {
        // readonly surfaces (git browser/blame/etc.) share the Walker;
        // their surface-specific keys live in feed_readonly (0001 §3)
        if self.buf().readonly {
            return self.feed_readonly(key);
        }
        // 0051 R05: +/- in a collection grow/shrink excerpt context —
        // a collection override of the vim line motions, named as such
        if self.walker.is_ground() && self.collections.contains_key(&self.current()) {
            match key {
                Key::Char('+') => {
                    self.collection_context_step(true);
                    return;
                }
                Key::Char('-') => {
                    self.collection_context_step(false);
                    return;
                }
                _ => {}
            }
        }
        // Esc is a mode-level key: collapse to the primary cursor and
        // ground the machine (0013 §3) — it never walks the trie
        if key == Key::Esc {
            self.cancel_remote_write(self.current());
            self.collapse_cursors();
            self.walker.clear();
            return;
        }
        // every other key event walks the one machine (0016)
        self.feed_command(key);
    }

    /// Shared Walker dispatch: normal mode, readonly surfaces, and any
    /// surface mid-composition all reduce typed actions here.
    pub(crate) fn feed_command(&mut self, key: Key) {
        let action = self.walker.feed(key);
        match action {
            super::input::Action::Pending => {}
            super::input::Action::Invalid(keys) => {
                self.message = format!("not an editor command: {keys}")
            }
            super::input::Action::QueryError(error) => self.message = error.to_string(),
            super::input::Action::EnterText { sigil, state } => self.begin_text_line(sigil, state),
            super::input::Action::Grammar(command) => self.dispatch_grammar(&command),
            super::input::Action::Row {
                row,
                count,
                register,
                arg,
                key,
            } => self.dispatch_row(row, count, register, arg, key),
            super::input::Action::VisualSurround(_) => {
                unreachable!("normal Walker cannot emit visual actions")
            }
        }
    }

    /// A grammar command: motions move, yanks survive readonly, edits
    /// refuse there. The one grammar entrypoint — prompts, aliases and
    /// the Walker all land here.
    pub(crate) fn dispatch_grammar(&mut self, command: &grammar::Command) {
        match command.op {
            None => self.move_cursor(command),
            Some(grammar::Op::Yank) if self.buf().readonly => self.yank_only(command),
            Some(_) if self.buf().readonly => self.message = "readonly buffer".into(),
            Some(_) => self.execute(command),
        }
    }

    /// A table row dispatch: typed count/register/arg ride the Action
    /// (0016 — no string inspection). Count semantics by id:
    /// most leaves repeat, insert entries carry it into the session,
    /// visible jumps treat it as a line offset, replace multiplies.
    fn dispatch_row(
        &mut self,
        row: &'static crate::keymap::Binding,
        count: Option<usize>,
        register: Option<char>,
        arg: Option<char>,
        key: char,
    ) {
        use crate::keymap::Handler;
        if self.buf().readonly {
            // dispatch capability check on existing stable command ids,
            // not a second grammar: git handlers act on their stamped
            // source targets; navigation/yank/visual stay shared
            let allowed = match row.handler {
                Handler::Alias(_) => true, // resolved typed op is checked by dispatch_grammar
                Handler::Leaf(_) => {
                    row.sections.contains(&"git")
                        || matches!(
                            row.id,
                            "search-next"
                                | "search-prev"
                                | "visual-enter"
                                | "visual-block"
                                | "pane-nav"
                                | "pane-split"
                                | "pane-close"
                                | "hunk-nav"
                                | "clip-yank"
                                | "redraw"
                                | "view-place"
                                | "visible-jumps"
                                | "scroll-pages"
                                | "enter"
                                | "jumplist"
                                | "jump-forward"
                                | "goto-definition"
                                | "switch-source-header"
                                | "references"
                                | "implementation"
                                | "type-definition"
                                | "declaration"
                                | "diagnostic-jumps"
                                | "hover"
                                | "remote-open"
                                | "files"
                                | "directory-reveal"
                                | "buffers"
                                | "search"
                                | "replace-global"
                                | "help"
                                | "alternate-buffer"
                                | "word-search"
                                | "document-symbols"
                                | "diagnostics"
                                | "code-actions"
                                | "jumplist-picker"
                                | "undo-tree"
                        )
                }
                Handler::AbsorbChar(
                    crate::keymap::AbsorbKind::Find
                    | crate::keymap::AbsorbKind::MarkSet
                    | crate::keymap::AbsorbKind::MarkJump,
                ) => true,
                _ => false,
            };
            if !allowed {
                self.message = "readonly buffer".into();
                return;
            }
        }
        let n = count.unwrap_or(1);
        match row.handler {
            Handler::Leaf(f) => {
                let last = key;
                match row.id {
                    "visible-jumps" => self.jump_visible(last, n),
                    "insert-entries" => {
                        self.insert_count = n;
                        f(self, last);
                    }
                    "paste" => self.paste_named(register, n, last == 'P'),
                    "scroll-pages" => self.scroll_counted(last, n),
                    // Space y: the clipboard yank is typed operator
                    // state in the Walker — `2 yw` yanks two words to
                    // `+`, no synthetic grammar text (R7)
                    "clip-yank" => self
                        .walker
                        .begin_operator(grammar::Op::Yank, Some('+'), count),
                    _ => self.run_counted_leaf(f, last, n),
                }
            }
            // aliases are semantic (0016): the expansion parses ONCE
            // into a grammar Command; the walker's count/register merge
            // in — nothing replays through input
            Handler::Alias(expansion) => match grammar::parse(expansion) {
                Parse::Complete(mut cmd) => {
                    cmd.count = Some(n.saturating_mul(cmd.count.unwrap_or(1)));
                    if register.is_some() {
                        cmd.register = register;
                    }
                    self.dispatch_grammar(&cmd);
                }
                Parse::QueryError(error) => self.message = error.to_string(),
                Parse::Incomplete | Parse::Invalid => {
                    self.message = format!("not an editor command: {key}");
                }
            },
            Handler::AbsorbChar(kind) => {
                let c = arg.unwrap_or('\0');
                use crate::keymap::AbsorbKind;
                match kind {
                    AbsorbKind::Replace => self.replace_char_n(c, n),
                    AbsorbKind::MarkSet => self.set_mark(c),
                    AbsorbKind::MarkJump => self.jump_mark(c),
                    AbsorbKind::Find => {} // grammar resolved f<c> in the machine
                    AbsorbKind::MacroRecord => self.macro_toggle(c),
                    AbsorbKind::MacroPlay if c == '@' => self.macro_again(n),
                    AbsorbKind::MacroPlay => self.macro_play(c, n),
                }
            }
            Handler::Prefix
            | Handler::Motion
            | Handler::Operator
            | Handler::ObjectPrefix
            | Handler::TextLine
            | Handler::AbsorbRegister
            | Handler::Soon
            | Handler::Contextual => {}
        }
    }

    // ---- handler shims for the command table (0008 stage 2) ---------

    pub(crate) fn repeat_search_pub(&mut self, invert: bool) {
        self.repeat_search(invert);
    }
    pub(crate) fn jump_hunk_pub(&mut self, forward: bool) {
        self.jump_hunk(forward);
    }
    pub(crate) fn search_word_under_cursor_pub(&mut self, backward: bool) {
        self.search_word_under_cursor(backward);
    }
    pub(crate) fn repeat_find_pub(&mut self, reverse: bool) {
        self.repeat_find(reverse);
    }
    /// "p P" row: the completing key picks before/after.
    pub(crate) fn paste_named_pub(&mut self, name: Option<char>, count: usize, before: bool) {
        self.paste_named(name, count, before);
    }
    /// "J ." row: the completing key picks the command.
    pub(crate) fn join_or_repeat(&mut self, key: char) {
        if key == 'J' {
            self.join_lines_pub();
        } else {
            self.dot_repeat_pub();
        }
    }
    /// "i a A o O I" row: insert entries by key.
    pub(crate) fn insert_entry_pub(&mut self, key: char) {
        match key {
            'i' => self.enter_insert_from("i"),
            'a' => self.append(),
            'A' => self.append_eol(),
            'o' => self.open_below(),
            'O' => self.open_above(),
            'I' => {
                self.run_motion("^");
                self.enter_insert_from("I");
            }
            _ => {}
        }
    }
    /// "v V" row.
    pub(crate) fn enter_visual_pub(&mut self, key: char) {
        self.enter_visual(key == 'V');
    }
}