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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, Key, Mode};
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",
}
}
/// One-level dedent when the line so far is whitespace-only (called
/// before inserting a closer). No-op when there is real text or no
/// indent to give back.
fn dedent_for_closer(&mut self) {
let line = self.buf().line_of(self.head());
let start = self.buf().line_start(line);
let col = self.buf().col_of(self.head());
let text = self.buf().line_text(line);
let before: String = text.chars().take(col).collect();
if !before.chars().all(|c| c == ' ' || c == '\t') {
return; // real text before the cursor — never reindent
}
// Strip exactly one indent unit: a tab, or `width` spaces.
if start < self.head() && self.buf().byte(start) == b'\t' {
self.buf_mut()
.delete(strop_core::Range::charwise(start, start + 1));
self.set_head(self.head() - 1);
return;
}
let width = self.cur_indent().width;
let mut strip = 0;
while strip < width && start + strip < self.head() && self.buf().byte(start + strip) == b' '
{
strip += 1;
}
if strip == 0 {
return;
}
self.buf_mut()
.delete(strop_core::Range::charwise(start, start + strip));
self.set_head(self.head().saturating_sub(strip));
// dot-repeat: the dedent belongs to the same change; the recorded
// insert text keeps literal content, replay re-derives via the
// same smartindent path
}
/// Indent for a new line at the cursor (0001 daily-driver): copy the
/// current line's leading whitespace, plus one level after an opener
/// (`{[`(` c-like, `:` python-ish). Configurable width (config.toml).
pub(crate) fn auto_indent(&self) -> String {
let line = self.buf().line_of(self.head());
let text = self.buf().line_text(line);
let before_cursor = &text[..self.buf().col_of(self.head()).min(text.len())];
let base: String = before_cursor
.chars()
.take_while(|c| *c == ' ' || *c == '\t')
.collect();
let trimmed = before_cursor.trim_end();
let deeper = trimmed.ends_with('{')
|| trimmed.ends_with('[')
|| trimmed.ends_with('(')
|| trimmed.ends_with(':');
let mut indent = base;
if deeper {
indent.push_str(&self.cur_indent().unit());
}
indent
}
/// Indent for o/O: the current line's full leading whitespace,
/// deepened after an opener even mid-line.
pub(crate) fn auto_indent_full_line(&self) -> String {
let line = self.buf().line_of(self.head());
let text = self.buf().line_text(line);
let base: String = text
.chars()
.take_while(|c| *c == ' ' || *c == '\t')
.collect();
let trimmed = text.trim_end();
let deeper = trimmed.ends_with('{')
|| trimmed.ends_with('[')
|| trimmed.ends_with('(')
|| trimmed.ends_with(':');
let mut indent = base;
if deeper {
indent.push_str(&self.cur_indent().unit());
}
indent
}
/// 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());
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();
}
}
}
pub(crate) fn feed_insert(&mut self, key: Key) {
// gi's memory: where the insert session is (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 => {
self.mode = Mode::Normal;
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);
// vim insert counts: `3iX` types X three times — the
// replay joins the session's undo unit (commit after)
let count = std::mem::replace(&mut self.insert_count, 1);
if let Some(rec) = self.recording_insert.take() {
if count > 1 {
let open = self.insert_open.take();
for _ in 1..count {
if let Some(o) = &open {
// o/O: the opened line repeats too — the
// stored text already carries the EOL style
// it was opened with
let at = (self.head() + 1).min(self.buf().len_bytes());
self.buf_mut().insert(at, o);
self.set_head(at + o.len().saturating_sub(1));
}
for ch in rec.chars() {
// a recorded newline replays as the
// buffer's own break (CRLF stays CRLF)
let piece = if ch == '\n' {
self.newline_str().to_string()
} else {
ch.to_string()
};
let at = (self.head() + 1).min(self.buf().len_bytes());
self.buf_mut().insert(at, &piece);
self.set_head(at + piece.len().saturating_sub(1));
}
}
}
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
for &pos in positions.iter().rev() {
self.buf_mut()
.delete(strop_core::Range::charwise(pos - 1, pos));
}
if !positions.is_empty() {
self.remap_after_mirrored_edit(&positions, -1);
if let Some(rec) = &mut self.recording_insert {
rec.pop();
}
}
}
Key::Enter => {
let indent = self.auto_indent();
let text = format!("{}{indent}", self.newline_str());
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, &text);
}
self.remap_after_mirrored_edit(&positions, text.len() as isize);
if let Some(rec) = &mut self.recording_insert {
rec.push('\n');
rec.push_str(&indent);
}
}
// 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::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);
}
Key::Char(c) => {
// smartindent (vim/helix behavior): a closer typed on an
// indent-only line dedents one level first — typing `}`
// after the auto-indent deepens never strands you
if matches!(c, '}' | ']' | ')') {
self.dedent_for_closer();
}
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);
}
}
}
}
}