468 lines
15 KiB
Rust
468 lines
15 KiB
Rust
/*
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* Copyright (c) 2023 Marceline Cramer
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*
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* This program is free software: you can redistribute it and/or modify it under
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* the terms of the GNU Affero General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see https://www.gnu.org/licenses/.
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*/
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use std::{ffi::OsString, fs::OpenOptions, io::Write, path::PathBuf, sync::Arc};
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use crossbeam_channel::Sender;
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use crossterm::{
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cursor,
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event::{Event, KeyCode, KeyEvent},
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terminal, QueueableCommand, Result,
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};
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use parking_lot::Mutex;
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use ropey::Rope;
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use crate::{
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buffer::Buffer,
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config::{Config, ThemeWatcher},
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keybinds::{Key, Keybind},
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theme::{StyleStore, StyledString},
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Cursor, Direction,
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};
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#[derive(Clone, Debug, Default)]
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pub struct CommandState {
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pub buf: String,
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pub cursor: usize,
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}
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#[derive(Copy, Clone, Debug)]
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pub struct InsertState {
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pub append: bool,
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}
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#[derive(Clone, Debug, Default)]
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pub enum Mode {
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#[default]
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Normal,
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Command(CommandState),
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Visual,
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Insert(InsertState),
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}
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impl Mode {
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pub fn cursor_style(&self) -> cursor::SetCursorStyle {
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use cursor::SetCursorStyle as Style;
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match self {
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Mode::Normal => Style::SteadyBlock,
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Mode::Visual => Style::BlinkingBlock,
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Mode::Insert(_) => Style::BlinkingBar,
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Mode::Command(_) => Style::SteadyUnderScore,
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}
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}
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}
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pub struct Rect {
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pub position: (usize, usize),
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pub size: (usize, usize),
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}
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pub struct Window {
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pub rect: Rect,
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pub contents: Vec<StyledString>,
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}
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impl Window {
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pub fn draw(
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&self,
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out: &mut impl QueueableCommand,
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styles: &mut StyleStore,
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) -> crossterm::Result<()> {
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let x = self.rect.position.0 as u16;
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let base = *styles.get_scope("ui.window");
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let width = self.rect.size.0;
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let clip = 0..width;
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let padding: String = std::iter::repeat(' ').take(width).collect();
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for row in 0..self.rect.size.1 {
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let y = self.rect.position.1 as u16 + row as u16;
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out.queue(cursor::MoveTo(x, y))?;
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let remaining = if let Some(line) = self.contents.get(row) {
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line.print_sub(out, clip.clone(), base)?
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} else {
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width
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};
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let padding = &padding[0..remaining];
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base.print_styled(out, padding)?;
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}
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Ok(())
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}
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}
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pub struct State {
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pub styles: Arc<Mutex<StyleStore>>,
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pub config: Config,
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pub buffer: Buffer,
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pub undo_buffers: Vec<Buffer>,
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pub redo_buffers: Vec<Buffer>,
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pub cursor: Cursor,
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pub file: Option<OsString>,
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pub window: Option<Window>,
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pub mode: Mode,
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pub submode: Option<Key>,
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pub last_saved: Rope,
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pub scroll: Cursor,
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pub size: (usize, usize),
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pub quit: bool,
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pub error: Option<String>,
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pub theme_tx: Sender<PathBuf>,
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}
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impl State {
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pub fn from_str(file_name: Option<OsString>, text: &str) -> Result<Self> {
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let styles = Arc::new(Mutex::new(StyleStore::default()));
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let buffer = Buffer::from_str(styles.clone(), text);
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let last_saved = buffer.as_ref().clone();
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let (cols, rows) = terminal::size()?;
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let theme_tx = ThemeWatcher::spawn(styles.clone());
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Ok(Self {
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styles,
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config: Default::default(),
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buffer,
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undo_buffers: Vec::new(),
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redo_buffers: Vec::new(),
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cursor: Cursor::default(),
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file: file_name,
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mode: Mode::default(),
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submode: None,
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last_saved,
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scroll: Cursor::default(),
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size: (cols as usize, rows as usize),
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quit: false,
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error: None,
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theme_tx,
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window: None,
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})
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}
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pub fn draw(&mut self, out: &mut impl Write) -> Result<()> {
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// begin update
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let (cols, rows) = terminal::size()?;
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out.queue(terminal::BeginSynchronizedUpdate)?;
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out.queue(terminal::Clear(terminal::ClearType::All))?;
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let mut styles = self.styles.lock();
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// draw status line
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let mut set_cursor_pos = None;
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let mut show_status_bar = false;
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if let Mode::Command(CommandState { buf, cursor }) = &self.mode {
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let col = *cursor as u16 + 1;
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let row = rows - 1;
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out.queue(cursor::MoveTo(0, row))?;
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write!(out, ":{}", buf)?;
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set_cursor_pos = Some((col, row));
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show_status_bar = true;
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} else if let Some(error) = self.error.as_ref() {
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let error_style = styles.get_scope("error");
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out.queue(cursor::MoveTo(0, rows - 1))?;
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error_style.print_styled(out, error)?;
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show_status_bar = true;
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}
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// done with styles
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drop(styles);
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// draw buffer
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let buffer_rows = if show_status_bar { rows - 1 } else { rows };
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let lr_width = self
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.buffer
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.draw(cols, buffer_rows, self.scroll, self.cursor, out)?;
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// draw submode
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if let Some(submode) = self.submode {
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out.queue(cursor::MoveTo(cols - 10, rows - 1))?;
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write!(out, "{:?}", submode)?;
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}
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// draw open window
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if let Some(window) = self.window.as_ref() {
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let mut styles = self.styles.lock();
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window.draw(out, &mut styles)?;
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}
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// draw cursor
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let cursor_pos = set_cursor_pos.unwrap_or_else(|| {
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// calculate cursor position on buffer
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let cursor = self.buffer.clamped_cursor(self.cursor);
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let col = cursor.column.saturating_sub(self.scroll.column) as u16;
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let row = cursor.line.saturating_sub(self.scroll.line) as u16;
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let col = col + lr_width as u16;
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(col, row)
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});
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out.queue(cursor::MoveTo(cursor_pos.0, cursor_pos.1))?;
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out.queue(self.mode.cursor_style())?;
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// finish update
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out.queue(terminal::EndSynchronizedUpdate)?;
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out.flush()?;
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Ok(())
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}
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/// Sets the current error message.
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pub fn set_error(&mut self, error: impl ToString) {
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self.error = Some(error.to_string());
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}
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pub fn on_event(&mut self, event: Event) {
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// reset the error from the last event
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self.error = None;
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// close open window
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self.window.take();
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match event {
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Event::Resize(cols, rows) => {
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self.size = (cols as usize, rows as usize);
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}
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Event::Key(KeyEvent { code, .. }) => match &self.mode {
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Mode::Normal | Mode::Visual => {
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self.on_key(code);
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}
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Mode::Command(state) => self.on_command_key(code, state.clone()),
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Mode::Insert(_) => {
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if !self.on_key(code) {
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if let KeyCode::Char(c) = code {
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self.buffer.insert_char(self.cursor, c);
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self.move_cursor(Direction::Right);
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}
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}
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}
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},
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_ => {}
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}
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}
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fn on_command_key(&mut self, code: KeyCode, mut state: CommandState) {
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match code {
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KeyCode::Char(c) => {
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state.buf.insert(state.cursor, c);
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state.cursor += 1;
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}
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KeyCode::Backspace => {
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if state.cursor > 0 {
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state.cursor -= 1;
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state.buf.remove(state.cursor);
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}
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}
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KeyCode::Delete if state.cursor < state.buf.len() => {
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state.buf.remove(state.cursor);
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}
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KeyCode::Left if state.cursor > 0 => {
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state.cursor -= 1;
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}
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KeyCode::Right if state.cursor < state.buf.len() => {
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state.cursor += 1;
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}
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KeyCode::Enter => {
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// TODO add to command history
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let _ = self
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.execute_command(&state.buf)
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.map_err(|err| self.set_error(err));
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self.mode = Mode::Normal;
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return;
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}
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KeyCode::Esc => {
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self.mode = Mode::default();
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return;
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}
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_ => {}
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}
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self.mode = Mode::Command(state);
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}
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/// Processes a key press event.
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///
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/// Returns `true` if the key was handled by a keybind, `false` otherwise.
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fn on_key(&mut self, key: Key) -> bool {
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let keybinds = match &self.mode {
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Mode::Normal => &self.config.keybinds.normal,
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Mode::Insert(_) => &self.config.keybinds.insert,
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Mode::Visual => &self.config.keybinds.visual,
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Mode::Command(_) => return false, // command mode is handled in [on_command_event]
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};
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if let Some(submode) = self.submode {
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// if we're currently in a submode, try to run this submode's keybind
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keybinds
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.submodes
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.get(&submode)
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.and_then(|submode| submode.get(&key))
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.cloned()
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.map(|keybind| self.execute_keybind(keybind));
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// whether or not there is a keybind we exit the submode
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self.submode = None;
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} else if keybinds.submodes.contains_key(&key) {
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// enter a submode if available
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self.submode = Some(key);
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} else if let Some(keybind) = keybinds.map.get(&key) {
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// run the keybind if available
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self.execute_keybind(keybind.clone());
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} else {
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// key is not bound; don't handle
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return false;
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}
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true
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}
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fn write_buffer(&mut self, file: OsString) -> Result<()> {
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self.last_saved = self.buffer.as_ref().clone();
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let out = self.buffer.as_ref().bytes().collect::<Vec<u8>>();
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let mut handle = OpenOptions::new()
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.create(true)
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.truncate(true)
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.write(true)
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.open(file)?;
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handle.write_all(out.as_slice())?;
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Ok(())
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}
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fn write_command(&mut self, command: &str, args: &[&str]) -> std::result::Result<(), String> {
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let handle = match self.file.clone() {
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Some(handle) => handle,
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None => match args.get(0) {
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Some(part) => {
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let file = OsString::from(part);
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self.file = Some(file.clone());
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file
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}
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None => {
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return Err(format!("{}: No file name.", command));
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}
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},
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};
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self.write_buffer(handle).map_err(|err| format!("{}", err))
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}
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fn execute_keybind(&mut self, keybind: Keybind) {
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match keybind {
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Keybind::Action(action) => action(self),
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Keybind::Command(command) => {
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let _ = self
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.execute_command(&command)
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.map_err(|err| self.set_error(err));
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self.mode = Mode::Normal;
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return;
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}
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}
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}
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fn execute_command(&mut self, command: &str) -> std::result::Result<(), String> {
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let command_parts = command.split(' ').collect::<Vec<&str>>();
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let command = match command_parts.get(0) {
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Some(command) => command,
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None => return Ok(()),
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};
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let args = &command_parts[1..];
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match *command {
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"q!" => self.quit = true,
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"q" => {
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if self.last_saved == *self.buffer.as_ref() {
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self.quit = true;
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} else {
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return Err("Buffer is unsaved (add ! to override)".into());
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}
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}
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"w" => return self.write_command(command, args),
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"wq" => {
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self.write_command(command, args)?;
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self.quit = true;
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}
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command => match command.parse::<usize>() {
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Err(_) => return Err(format!("{}: Unrecognized command.", command)),
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Ok(line) if line >= self.buffer.as_ref().len_lines() => {
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return Err(format!("Line {} is out-of-bounds", line))
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}
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Ok(line) => {
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self.cursor.line = line;
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self.scroll_to_cursor();
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}
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},
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}
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Ok(())
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}
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pub fn move_cursor(&mut self, direction: Direction) {
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let wrap = self.config.move_linewrap;
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self.buffer.move_cursor(&mut self.cursor, direction, wrap);
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self.scroll_to_cursor();
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}
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pub fn scroll_to_cursor(&mut self) {
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if self.cursor.column < self.scroll.column + 3 {
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self.scroll.column = self.cursor.column.saturating_sub(3);
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} else if self.cursor.column + 6 >= self.scroll.column + self.size.0 {
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self.scroll.column = self.cursor.column.saturating_sub(self.size.0 - 6);
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}
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if self.cursor.line < self.scroll.line {
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self.scroll.line = self.cursor.line;
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} else if self.cursor.line + 3 >= self.scroll.line + self.size.1 {
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self.scroll.line = self.cursor.line + 3 - self.size.1;
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}
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}
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/// If modified, saves the current buffer in undo history and clears the redo history.
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pub fn save_buffer(&mut self) {
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/*if let Some(last) = self.undo_buffers.last() {
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if *last.as_ref() == *self.buffer.as_ref() {
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return;
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}
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}*/
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let current = self.buffer.clone();
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self.undo_buffers.push(current);
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self.redo_buffers.clear();
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}
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/// Pops the last undo state from the history and pushes the current state to the redo buffers.
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pub fn undo(&mut self) {
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match self.undo_buffers.pop() {
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None => self.set_error("Already at oldest change"),
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Some(last) => {
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let current = std::mem::replace(&mut self.buffer, last);
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self.redo_buffers.push(current);
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}
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}
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}
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/// Pops the next redo state from the history and pushes the current state to the undo buffers.
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pub fn redo(&mut self) {
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match self.redo_buffers.pop() {
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None => self.set_error("Already at newest change"),
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Some(next) => {
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let current = std::mem::replace(&mut self.buffer, next);
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self.undo_buffers.push(current);
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}
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}
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}
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}
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