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Work on insert mode.

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This commit is contained in:
Blaž Hrastnik 2020-09-05 22:01:05 +09:00
parent e806446379
commit 579b6899f1
6 changed files with 139 additions and 59 deletions
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22
helix-core/src/commands.rs
View file

@ -1,4 +1,4 @@
use crate::state::{Direction, Granularity, State};
use crate::state::{Direction, Granularity, Mode, State};
/// A command is a function that takes the current state and a count, and does a side-effect on the
/// state (usually by creating and applying a transaction).
@ -48,3 +48,23 @@ pub fn move_line_down(state: &mut State, count: usize) {
count,
);
}
pub fn insert_mode(state: &mut State, _count: usize) {
state.mode = Mode::Insert;
}
pub fn normal_mode(state: &mut State, _count: usize) {
state.mode = Mode::Normal;
}
// TODO: insert means add text just before cursor, on exit we should be on the last letter.
pub fn insert(state: &mut State, c: char) {
// TODO: needs to work with multiple cursors
use crate::transaction::ChangeSet;
let pos = state.selection.primary().head;
let changes = ChangeSet::insert(&state.doc, pos, c);
// TODO: need to store history
changes.apply(state.contents_mut());
state.selection = state.selection.clone().map(&changes);
}

4
helix-core/src/selection.rs
View file

@ -63,8 +63,8 @@ impl Range {
/// Map a range through a set of changes. Returns a new range representing the same position
/// after the changes are applied.
pub fn map(self, changes: &ChangeSet) -> Self {
let anchor = changes.map_pos(self.anchor, Assoc::Before);
let head = changes.map_pos(self.head, Assoc::Before);
let anchor = changes.map_pos(self.anchor, Assoc::After);
let head = changes.map_pos(self.head, Assoc::After);
// TODO: possibly unnecessary
if self.anchor == anchor && self.head == head {

14
helix-core/src/state.rs
View file

@ -1,10 +1,16 @@
use crate::graphemes::{nth_next_grapheme_boundary, nth_prev_grapheme_boundary, RopeGraphemes};
use crate::{Buffer, Rope, RopeSlice, Selection, SelectionRange};
pub enum Mode {
Normal,
Insert,
}
/// A state represents the current editor state of a single buffer.
pub struct State {
pub doc: Buffer,
pub selection: Selection,
pub mode: Mode,
}
#[derive(Copy, Clone, PartialEq, Eq)]
@ -26,6 +32,7 @@ impl State {
Self {
doc,
selection: Selection::single(0, 0),
mode: Mode::Normal,
}
}
@ -119,10 +126,15 @@ impl State {
// TODO: update selection in state via transaction
}
pub fn file(&self) -> &Rope {
pub fn contents(&self) -> &Rope {
// used to access file contents for rendering to screen
&self.doc.contents
}
pub fn contents_mut(&mut self) -> &mut Rope {
// used to access file contents for rendering to screen
&mut self.doc.contents
}
}
/// Coordinates are a 0-indexed line and column pair.

12
helix-core/src/transaction.rs
View file

@ -47,6 +47,18 @@ impl ChangeSet {
}
}
pub fn insert(buf: &Buffer, pos: usize, c: char) -> Self {
let len = buf.contents.len_chars();
Self {
changes: vec![
Change::Retain(pos),
Change::Insert(Tendril::from_char(c)),
Change::Retain(len - pos),
],
len,
}
}
// TODO: from iter
/// Combine two changesets together.

117
helix-term/src/editor.rs
View file

@ -9,36 +9,11 @@ use crossterm::{
terminal::{self, disable_raw_mode, enable_raw_mode},
};
use futures::{future::FutureExt, select, StreamExt};
use helix_core::{state::coords_at_pos, Buffer, State};
use helix_core::{state::coords_at_pos, state::Mode, Buffer, State};
use std::io::{self, stdout, Write};
use std::path::PathBuf;
use std::time::Duration;
pub struct BufferComponent<'a> {
x: u16,
y: u16,
contents: Vec<&'a str>,
}
impl BufferComponent<'_> {
pub fn render(&self) {
for (n, line) in self.contents.iter().enumerate() {
execute!(
stdout(),
SetForegroundColor(Color::DarkCyan),
cursor::MoveTo(self.x, self.y + n as u16),
Print((n + 1).to_string())
);
execute!(
stdout(),
SetForegroundColor(Color::Reset),
cursor::MoveTo(self.x + 2, self.y + n as u16),
Print(line)
);
}
}
}
static EX: smol::Executor = smol::Executor::new();
pub struct Editor {
@ -70,21 +45,56 @@ impl Editor {
}
fn render(&mut self) {
// TODO:
match &self.state {
Some(s) => {
let view = BufferComponent {
x: 0,
y: self.first_line,
contents: s
.file()
Some(state) => {
let lines = state
.contents()
.lines_at(self.first_line as usize)
.take(self.size.1 as usize)
.map(|x| x.as_str().unwrap())
.collect::<Vec<&str>>(),
.map(|x| x.as_str().unwrap());
let mut stdout = stdout();
for (n, line) in lines.enumerate() {
execute!(
stdout,
SetForegroundColor(Color::DarkCyan),
cursor::MoveTo(0, n as u16),
Print((n + 1).to_string())
);
execute!(
stdout,
SetForegroundColor(Color::Reset),
cursor::MoveTo(2, n as u16),
Print(line)
);
}
let mode = match state.mode {
Mode::Insert => "INS",
Mode::Normal => "NOR",
};
view.render();
execute!(
stdout,
SetForegroundColor(Color::Reset),
cursor::MoveTo(0, self.size.1),
Print(mode)
);
// set cursor shape
match state.mode {
Mode::Insert => write!(stdout, "\x1B[6 q"),
Mode::Normal => write!(stdout, "\x1B[2 q"),
};
// render the cursor
let pos = state.selection.primary().head;
let coords = coords_at_pos(&state.doc.contents.slice(..), pos);
execute!(
stdout,
cursor::MoveTo((coords.1 + 2) as u16, coords.0 as u16)
);
}
None => (),
}
@ -108,22 +118,30 @@ impl Editor {
break;
}
Some(Ok(Event::Key(event))) => {
if let Some(state) = &mut self.state {
match state.mode {
Mode::Insert => {
match event {
KeyEvent {
code: KeyCode::Esc, ..
} => helix_core::commands::normal_mode(state, 1),
KeyEvent {
code: KeyCode::Char(c),
..
} => helix_core::commands::insert(state, c),
_ => (), // skip
}
self.render();
}
Mode::Normal => {
// TODO: handle modes and sequences (`gg`)
if let Some(command) = keymap.get(&event) {
if let Some(state) = &mut self.state {
// TODO: handle count other than 1
command(state, 1);
self.render();
// render the cursor
let pos = self.state.as_ref().unwrap().selection.primary().head;
let coords = coords_at_pos(
&self.state.as_ref().unwrap().doc.contents.slice(..),
pos,
);
execute!(
stdout(),
cursor::MoveTo((coords.1 + 2) as u16, coords.0 as u16)
);
}
}
}
}
}
@ -145,6 +163,9 @@ impl Editor {
self.print_events().await;
// reset cursor shape
write!(stdout, "\x1B[2 q");
execute!(stdout, terminal::LeaveAlternateScreen)?;
disable_raw_mode()?;

15
helix-term/src/keymap.rs
View file

@ -116,5 +116,20 @@ pub fn default() -> Keymap {
code: KeyCode::Char('l'),
modifiers: Modifiers::NONE
} => commands::move_char_right as Command,
Key {
code: KeyCode::Char('i'),
modifiers: Modifiers::NONE
} => commands::insert_mode as Command,
Key {
code: KeyCode::Esc,
modifiers: Modifiers::NONE
} => commands::normal_mode as Command,
)
// hashmap!(
// Key {
// code: KeyCode::Esc,
// modifiers: Modifiers::NONE
// } => commands::normal_mode as Command,
// )
}