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//! Insert mode: text in, Esc out. Every session is recorded so
//! dot-repeat can replay both the command and the inserted text.
//! Newlines preserve the buffer's line-ending style (0031 R5): Enter
//! and replay both insert the document's own break, CRLF or LF.
use super::{Editor, Mode};
use strop_core::frontend_input::Key;
pub(crate) mod replay;
impl Editor {
/// The buffer's line-ending for NEW lines: the first line's break
/// decides (vim's fileformat rule on one buffer) — `\r\n` when
/// line 0 ends CRLF, `\n` otherwise. A break-less buffer defaults
/// to LF.
pub(crate) fn newline_str(&self) -> &'static str {
let buf = self.buf();
if buf.len_bytes() == 0 {
return "\n";
}
// line_end(0) is the content end: the byte at it is the break
// (or the \r of a CRLF pair) when the file has a first break
let e = buf.line_end(0);
match buf.byte_at(e) {
Some(b'\r') if buf.byte_at(e + 1) == Some(b'\n') => "\r\n",
Some(b'\n') => "\n",
_ => "\n",
}
}
/// Enter insert mode and start recording (dot-repeat, 0001 §2.1).
/// `keys` is what got us here (`i`, `o`, `ci[`, …).
pub(crate) fn enter_insert_from(&mut self, keys: &str) {
// an insert session is one undo unit (with the change op, if any, that
// opened it); plain entries open a fresh transaction
self.tx_begin();
if !matches!(keys, "o" | "O") {
self.insert_open = None;
}
self.mode = Mode::Insert;
self.recording_insert = Some(String::new());
self.insert_replay = Some(Vec::new());
if self.last_cmd_keys.is_empty()
|| !matches!(keys.chars().next(), Some('c') if keys.len() > 1)
{
// plain entries remember their own key; change ops already set
// last_cmd_keys in execute()
if matches!(keys, "i" | "a" | "A" | "o" | "O" | "v..." | "V...") {
self.last_cmd_keys = keys.trim_end_matches("...").into();
self.last_change = None;
}
}
}
pub(crate) fn feed_insert(&mut self, key: Key) {
// 0069 D05: a live snippet tabstop session owns Tab/Esc/etc.
// first; printable keys fall through with the placeholder
// replaced (see snippet.rs).
if self.snippet.is_some() {
use super::snippet::SnippetKeyOutcome;
match self.snippet_key(key) {
SnippetKeyOutcome::Consumed => return,
SnippetKeyOutcome::EndAndForward => {}
SnippetKeyOutcome::PassThrough => {}
}
}
use super::completion::KeyDisposition;
match self.completion_key(key) {
KeyDisposition::Requested
| KeyDisposition::Navigated
| KeyDisposition::Accepted
| KeyDisposition::Dismissed => return,
KeyDisposition::DismissAndForward | KeyDisposition::PassThrough => {}
}
// Structural changes are planned against one revision before any
// cursor mutates. A deferred request retains the same ordered input.
let trigger = match key {
Key::Enter => Some(super::structural_indent::Trigger::Enter),
Key::Char(character @ ('}' | ']' | ')')) if self.closer_needs_alignment() => {
strop_syntax::DelimiterKind::closing(character)
.map(super::structural_indent::Trigger::Closer)
}
_ => None,
};
if let Some(trigger) = trigger {
let Some(edits) = self.resolve_indentation(trigger) else {
return;
};
let primary = edits.iter().find(|edit| edit.cursor.get() == self.head());
let removed = primary.map_or(0, |edit| {
let count = edit.cursor.get().saturating_sub(edit.start.get());
self.recording_insert
.as_ref()
.filter(|recording| {
recording.len() >= count
&& recording.as_bytes()[recording.len() - count..]
.iter()
.copied()
.eq(self
.buf()
.text()
.byte_slice(edit.start.get()..edit.cursor.get())
.bytes())
})
.map_or(0, |_| count)
});
if let (Some(recording), Some(edit)) = (&mut self.recording_insert, primary) {
recording.truncate(recording.len() - removed);
recording.push_str(&edit.text[..edit.landing]);
}
self.record_insert_key(key);
self.apply_indentation(&edits);
self.last_insert_pos = Some(self.head());
return;
}
if matches!(
key,
Key::Char(_) | Key::Tab | Key::Backspace | Key::Left | Key::Right | Key::Up | Key::Down
) {
self.record_insert_key(key);
}
// gi remembers the insert caret; Esc leaves the final position behind.
self.last_insert_pos = Some(self.head());
match key {
Key::CtrlW | Key::CtrlX | Key::CtrlD | Key::CtrlO | Key::CtrlL | Key::CtrlSpace => {
if key == Key::CtrlL {
self.needs_repaint = true; // desync recovery
}
}
Key::Esc => {
let count = std::mem::replace(&mut self.insert_count, 1);
if count > 1 {
let keys = self.insert_replay.clone().unwrap_or_default();
let open = self.insert_open.is_some();
for _ in 1..count {
if open {
self.replay_insert_key(Key::Enter);
}
for step in &keys {
self.replay_insert_step(step.clone());
}
}
self.replay_insert_key(Key::Esc);
return;
}
self.last_insert_replay = self.insert_replay.take().unwrap_or_default();
self.mode = Mode::Normal;
self.apply_pending_diagnostics();
self.set_head(self.head().saturating_sub(1));
let extras: Vec<strop_core::selection::Selection> = self
.extra_selections()
.iter()
.map(|s| strop_core::selection::Selection {
anchor: s.anchor,
head: s.head.saturating_sub(1),
})
.collect();
self.sels_mut().set_extra_selections(extras);
if let Some(rec) = self.recording_insert.take() {
if self.block_insert_state.is_some() {
self.block_replicate(&rec);
}
self.last_insert = Some(rec);
} else {
self.insert_open = None;
}
self.clamp_cursor();
self.normalize_cursors();
self.tx_commit(); // the insert session is one undo unit
}
Key::Backspace => {
// cascade: every cursor deletes one char back, bottom-up
// so positions never shift mid-batch (0013 §3)
let mut positions = self.all_cursors();
positions.sort_unstable();
positions.dedup();
positions.retain(|&p| p > 0); // cursors at 0 can't delete
let edits: Vec<_> = positions
.iter()
.map(|&pos| {
let start = if self.buf().byte_at(pos - 1) == Some(b'\n')
&& pos > 1
&& self.buf().byte_at(pos - 2) == Some(b'\r')
{
pos - 2
} else {
self.buf().clamp_boundary(pos - 1)
};
super::structural_indent::Edit {
cursor: strop_core::id::ByteOffset::new(pos),
start: strop_core::id::ByteOffset::new(start),
end: strop_core::id::ByteOffset::new(pos),
text: String::new(),
landing: 0,
}
})
.collect();
let removed_chars = edits
.iter()
.find(|edit| edit.cursor.get() == self.head())
.map_or(0, |edit| {
self.buf()
.text()
.byte_slice(edit.start.get()..edit.end.get())
.len_chars()
});
if !edits.is_empty() {
self.apply_indentation(&edits);
if let Some(rec) = &mut self.recording_insert {
for _ in 0..removed_chars {
rec.pop();
}
}
}
}
Key::Enter => unreachable!("structural Enter handled before dispatch"),
// arrows move in insert too (vim) — char-boundary honest
Key::Left => {
let start = self.buf().line_start(self.buf().line_of(self.head()));
if self.head() > start {
self.set_head(self.buf().clamp_boundary(self.head() - 1));
}
}
Key::Right => {
let end = self.buf().line_end(self.buf().line_of(self.head()));
if self.head() < end {
self.set_head(self.buf().ceil_boundary(self.head() + 1));
}
}
Key::Up | Key::Down => {
let line = self.buf().line_of(self.head());
let target = if key == Key::Up {
line.saturating_sub(1)
} else {
(line + 1).min(self.buf().len_lines().saturating_sub(1))
};
let col = self
.buf()
.col_of(self.head())
.min(self.buf().line_end(target) - self.buf().line_start(target));
self.set_head(
self.buf()
.clamp_boundary(self.buf().line_start(target) + col),
);
}
Key::CtrlR
| Key::CtrlU
| Key::CtrlF
| Key::CtrlB
| Key::CtrlCaret
| Key::CtrlV
| Key::CtrlN
| Key::CtrlP
| Key::CtrlY
| Key::CtrlE
| Key::Backtab => {}
Key::Tab => {
// vim: Tab inserts the indent unit — a tab or the
// document's spaces (config indent_style; detection may
// have resolved this buffer's own).
let unit = self.cur_indent().unit();
let mut positions = self.all_cursors();
positions.sort_unstable();
positions.dedup();
let width = unit.len();
for &pos in positions.iter().rev() {
self.buf_mut().insert(pos, &unit);
}
self.remap_after_mirrored_edit(&positions, width as isize);
if let Some(rec) = &mut self.recording_insert {
rec.push_str(&unit);
}
}
Key::Char(c) => {
let mut tmp = [0u8; 4];
let encoded = c.encode_utf8(&mut tmp);
let mut positions = self.all_cursors();
positions.sort_unstable();
positions.dedup(); // stacked cursors edit once
for &pos in positions.iter().rev() {
self.buf_mut().insert(pos, encoded);
}
self.remap_after_mirrored_edit(&positions, c.len_utf8() as isize);
if let Some(rec) = &mut self.recording_insert {
rec.push(c);
}
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use strop_core::Buffer;
#[test]
fn dot_repeat_includes_insert_mode_tab() {
let mut editor = Editor::new(Buffer::from_text("ab\ncd\n"));
editor.config = crate::config::Config {
indent_style: crate::config::IndentStyle::Tabs,
..Default::default()
};
editor.reresolve_indents();
editor.feed_text("i");
editor.feed(Key::Tab);
editor.feed_text("Z");
editor.feed(Key::Esc);
assert_eq!(editor.buf().text().to_string(), "\tZab\ncd\n");
editor.feed_text("j0.");
assert_eq!(editor.buf().text().to_string(), "\tZab\n\tZcd\n");
assert_eq!(editor.head(), editor.buf().line_start(1) + 1);
}
}