mirror of https://github.com/helix-editor/helix
editor.rs now uses crossterm
Jan Hrastnik
4 years ago
committed by
Blaž Hrastnik
parent
073fe61264
commit
19643446cd
@ -1,287 +1,69 @@
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use anyhow::Error;
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use std::io::{self, stdout, Write};
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use termwiz::caps::Capabilities;
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use termwiz::cell::AttributeChange;
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use termwiz::color::{AnsiColor, ColorAttribute, RgbColor};
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use termwiz::input::*;
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use termwiz::surface::Change;
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use termwiz::terminal::{buffered::BufferedTerminal, SystemTerminal, Terminal};
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use termwiz::widgets::*;
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use crate::Args;
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use crossterm::{
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cursor,
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cursor::position,
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event::{self, read, Event, KeyCode, KeyEvent},
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execute, style,
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terminal::{self, disable_raw_mode, enable_raw_mode},
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Result,
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};
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use std::{env, path::PathBuf};
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const HELP: &str = r#"
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- Use q to quit
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- Move cursor with h, j, k, l
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"#;
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use helix_core::Buffer;
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pub struct Editor {}
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/// This is a widget for our application
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impl Editor {
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pub struct MainScreen {}
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pub fn read_char() -> Result<char> {
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loop {
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impl MainScreen {
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if let Ok(Event::Key(KeyEvent {
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pub fn new() -> Self {
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code: KeyCode::Char(c),
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Self {}
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}
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}
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impl Widget for MainScreen {
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fn process_event(&mut self, event: &WidgetEvent, _args: &mut UpdateArgs) -> bool {
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true // handled it all
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}
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/// Draw ourselves into the surface provided by RenderArgs
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fn render(&mut self, args: &mut RenderArgs) {
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// args.surface.add_change(Change::ClearScreen(
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// ColorAttribute::TrueColorWithPaletteFallback(
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// RgbColor::new(0x31, 0x1B, 0x92),
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// AnsiColor::Black.into(),
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// ),
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// ));
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// args.surface
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// .add_change(Change::Attribute(AttributeChange::Foreground(
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// ColorAttribute::TrueColorWithPaletteFallback(
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// RgbColor::new(0xB3, 0x88, 0xFF),
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// AnsiColor::Purple.into(),
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// ),
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// )));
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}
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fn get_size_constraints(&self) -> layout::Constraints {
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let mut constraints = layout::Constraints::default();
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constraints.child_orientation = layout::ChildOrientation::Vertical;
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constraints
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}
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}
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pub struct BufferComponent<'a> {
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text: String,
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buffer: &'a mut Buffer,
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first_line: usize,
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}
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impl<'a> BufferComponent<'a> {
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/// Initialize the widget with the input text
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pub fn new(buffer: &'a mut Buffer) -> Self {
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Self {
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buffer,
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text: String::new(),
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first_line: 0,
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}
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}
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}
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impl<'a> Widget for BufferComponent<'a> {
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fn process_event(&mut self, event: &WidgetEvent, _args: &mut UpdateArgs) -> bool {
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match event {
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WidgetEvent::Input(InputEvent::Key(KeyEvent {
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key: KeyCode::Char('k'),
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..
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})) => {
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self.first_line = self.first_line.saturating_sub(1);
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}
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WidgetEvent::Input(InputEvent::Key(KeyEvent {
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key: KeyCode::Char('j'),
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..
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})) => {
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self.first_line = self.first_line.saturating_add(1);
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}
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WidgetEvent::Input(InputEvent::Key(KeyEvent {
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key: KeyCode::Enter,
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..
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..
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})) => {
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})) = event::read()
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self.text.push_str("\r\n");
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{
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return Ok(c);
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}
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}
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WidgetEvent::Input(InputEvent::Paste(s)) => {
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self.text.push_str(&s);
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}
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_ => {}
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}
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}
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true // handled it all
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}
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}
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/// Draw ourselves into the surface provided by RenderArgs
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pub fn print_events() -> Result<()> {
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fn render(&mut self, args: &mut RenderArgs) {
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loop {
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args.surface
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// Handle key events
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.add_change(Change::ClearScreen(ColorAttribute::Default));
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match Editor::read_char()? {
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'h' => execute!(io::stdout(), cursor::MoveLeft(1))?,
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// args.surface
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'j' => execute!(io::stdout(), cursor::MoveDown(1))?,
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// .add_change(Change::Attribute(AttributeChange::Foreground(
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'k' => execute!(io::stdout(), cursor::MoveUp(1))?,
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// ColorAttribute::TrueColorWithPaletteFallback(
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'l' => execute!(io::stdout(), cursor::MoveRight(1))?,
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// RgbColor::new(0x11, 0x00, 0xFF),
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'q' => {
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// AnsiColor::Purple.into(),
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execute!(
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// ),
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io::stdout(),
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// )));
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style::ResetColor,
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let (_width, height) = args.surface.dimensions();
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cursor::Show,
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terminal::LeaveAlternateScreen
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for line in self.buffer.contents.lines_at(self.first_line).take(height) {
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)?;
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args.surface
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break;
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.add_change(unsafe { String::from_utf8_unchecked(line.bytes().collect()) });
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}
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args.surface.add_change("\r");
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_ => println!("use 'q' to quit."),
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}
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}
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// args.surface
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// .add_change(format!("🤷 surface size is {:?}\r\n", dims));
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// args.surface.add_change(self.text.clone());
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// Place the cursor at the end of the text.
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// A more advanced text editing widget would manage the
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// cursor position differently.
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*args.cursor = CursorShapeAndPosition {
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coords: args.surface.cursor_position().into(),
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shape: termwiz::surface::CursorShape::SteadyBar,
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..Default::default()
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};
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}
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fn get_size_constraints(&self) -> layout::Constraints {
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let mut c = layout::Constraints::default();
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c.set_valign(layout::VerticalAlignment::Top);
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c
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}
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}
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pub struct StatusLine {}
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impl StatusLine {
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pub fn new() -> Self {
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StatusLine {}
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}
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}
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impl Widget for StatusLine {
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fn process_event(&mut self, event: &WidgetEvent, _args: &mut UpdateArgs) -> bool {
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true
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}
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fn render(&mut self, args: &mut RenderArgs) {
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args.surface.add_change(Change::ClearScreen(
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ColorAttribute::TrueColorWithPaletteFallback(
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RgbColor::new(0xFF, 0xFF, 0xFF),
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AnsiColor::Black.into(),
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),
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));
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args.surface
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.add_change(Change::Attribute(AttributeChange::Foreground(
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ColorAttribute::TrueColorWithPaletteFallback(
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RgbColor::new(0x00, 0x00, 0x00),
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AnsiColor::Black.into(),
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),
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)));
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args.surface.add_change(" helix");
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}
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fn get_size_constraints(&self) -> layout::Constraints {
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*layout::Constraints::default()
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.set_fixed_height(1)
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.set_valign(layout::VerticalAlignment::Bottom)
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}
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}
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pub struct Editor {
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terminal: BufferedTerminal<SystemTerminal>,
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buffer: Option<Buffer>,
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}
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impl Editor {
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pub fn new(mut args: Args) -> Result<Self, Error> {
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// Create a terminal
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let caps = Capabilities::new_from_env()?;
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let mut terminal = BufferedTerminal::new(SystemTerminal::new(caps)?)?;
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let mut editor = Editor {
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terminal,
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buffer: None,
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};
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if let Some(file) = args.files.pop() {
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editor.open(file)?;
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}
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}
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Ok(editor)
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}
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pub fn open(&mut self, path: PathBuf) -> Result<(), Error> {
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let buffer = Buffer::load(path)?;
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self.buffer = Some(buffer);
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Ok(())
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Ok(())
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}
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}
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pub fn run(&mut self) -> Result<(), Error> {
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pub fn run() -> Result<()> {
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// Start with an empty string; typing into the app will
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enable_raw_mode()?;
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// update this string.
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let mut typed_text = String::new();
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{
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let buf = &mut self.terminal;
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// Put the terminal in raw mode + alternate screen
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buf.terminal().enter_alternate_screen()?;
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buf.terminal().set_raw_mode()?;
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// Set up the UI
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let mut ui = Ui::new();
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let root_id = ui.set_root(MainScreen::new());
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let buffer_id =
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ui.add_child(root_id, BufferComponent::new(self.buffer.as_mut().unwrap()));
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// let root_id = ui.set_root(Buffer::new(&mut typed_text));
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ui.add_child(root_id, StatusLine::new());
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ui.set_focus(buffer_id);
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loop {
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// used for clearing the screen
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ui.process_event_queue()?;
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execute!(io::stdout(), terminal::EnterAlternateScreen)?;
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println!("{}", HELP);
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// After updating and processing all of the widgets, compose them
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let mut stdout = stdout();
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// and render them to the screen.
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if let Err(e) = Editor::print_events() {
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if ui.render_to_screen(buf)? {
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println!("Error: {:?}\r", e);
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// We have more events to process immediately; don't block waiting
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// for input below, but jump to the top of the loop to re-run the
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// updates.
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continue;
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}
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// Compute an optimized delta to apply to the terminal and display it
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buf.flush()?;
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// Wait for user input
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match buf.terminal().poll_input(None) {
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Ok(Some(InputEvent::Resized { rows, cols })) => {
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// FIXME: this is working around a bug where we don't realize
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// that we should redraw everything on resize in BufferedTerminal.
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buf.add_change(Change::ClearScreen(Default::default()));
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buf.resize(cols, rows);
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}
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Ok(Some(input)) => match input {
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InputEvent::Key(KeyEvent {
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key: KeyCode::Escape,
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..
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}) => {
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// Quit the app when escape is pressed
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break;
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}
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input @ _ => {
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// Feed input into the Ui
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ui.queue_event(WidgetEvent::Input(input));
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}
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},
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Ok(None) => {}
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Err(e) => {
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print!("{:?}\r\n", e);
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break;
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}
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}
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}
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}
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}
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// After we've stopped the full screen raw terminal,
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disable_raw_mode()
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// print out the final edited value of the input text.
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println!("The text you entered: {}", typed_text);
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Ok(())
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}
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pub fn render(&self) {
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// create a new window sized surface
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// paint all components
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// diff vs last frame, swap
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// paint diff
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}
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}
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}
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}
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