cl-frontend: Embrace the crossterm jank
This commit is contained in:
parent
e01c71f9a7
commit
78b8d87408
@ -379,13 +379,7 @@ pub mod cli {
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/// Runs the main REPL loop
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pub fn repl(&mut self) {
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use crate::repline::{error::Error, Repline};
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let mut rl = Repline::new(
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// std::fs::File::open("/dev/stdin").unwrap(),
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self.mode.ansi_color(),
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self.prompt_begin,
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self.prompt_again,
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);
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// self.prompt_begin();
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let mut rl = Repline::new(self.mode.ansi_color(), self.prompt_begin, self.prompt_again);
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fn clear_line() {
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print!("\x1b[G\x1b[J");
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}
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@ -397,16 +391,17 @@ pub mod cli {
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if buf.is_empty() || buf.ends_with('\n') {
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return;
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}
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rl.accept();
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println!("Cancelled. (Press Ctrl+C again to quit.)");
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continue;
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}
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// Ctrl-D: reset input, and parse it for errors
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Err(Error::CtrlD(buf)) => {
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rl.deny();
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if let Err(e) = Program::new(&buf).parse() {
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println!();
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clear_line();
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self.prompt_error(&e);
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}
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rl.deny();
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continue;
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}
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Err(e) => {
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@ -432,7 +427,7 @@ pub mod cli {
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Some(Ok(_)) => unreachable!(),
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Some(Err(error)) => {
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rl.deny();
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eprintln!("{error}");
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self.prompt_error(&error);
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continue;
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}
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}
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@ -211,109 +211,112 @@ impl<'a, R: Read> Repline<'a, R> {
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pub fn read(&mut self) -> ReplResult<String> {
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const INDENT: &str = " ";
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let mut stdout = stdout().lock();
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let stdout = &mut stdout;
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let _make_raw = raw();
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self.ed.begin_frame(&mut stdout)?;
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self.ed.render(&mut stdout)?;
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// self.ed.begin_frame(stdout)?;
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// self.ed.redraw_frame(stdout)?;
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self.ed.print_head(stdout)?;
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loop {
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stdout.flush()?;
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self.ed.begin_frame(&mut stdout)?;
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match self.input.next().ok_or(Error::EndOfInput)?? {
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// Ctrl+C: End of Text. Immediately exits.
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// Ctrl+D: End of Transmission. Ends the current line.
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'\x03' => {
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self.ed.render(&mut stdout)?;
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drop(_make_raw);
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writeln!(stdout)?;
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return Err(Error::CtrlC(self.ed.to_string()));
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}
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'\x04' => {
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self.ed.render(&mut stdout)?; // TODO: this, better
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drop(_make_raw);
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writeln!(stdout)?;
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return Err(Error::CtrlD(self.ed.to_string()));
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}
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// Tab: extend line by 4 spaces
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'\t' => {
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self.ed.extend(INDENT.chars());
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self.ed.extend(INDENT.chars(), stdout)?;
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}
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// ignore newlines, process line feeds. Not sure how cross-platform this is.
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'\n' => {}
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'\r' => {
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self.ed.push('\n').ignore();
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self.ed.render(&mut stdout)?;
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self.ed.push('\n', stdout)?;
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return Ok(self.ed.to_string());
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}
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// Escape sequence
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'\x1b' => self.escape()?,
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'\x1b' => self.escape(stdout)?,
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// backspace
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'\x08' | '\x7f' => {
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let ed = &mut self.ed;
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if ed.ends_with(INDENT.chars()) {
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for _ in 0..INDENT.len() {
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ed.pop().ignore();
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ed.pop(stdout)?;
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}
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} else {
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self.ed.pop().ignore();
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ed.pop(stdout)?;
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}
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}
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c if c.is_ascii_control() => {
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eprint!("\\x{:02x}", c as u32);
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}
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c => {
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self.ed.push(c).unwrap();
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self.ed.push(c, stdout)?;
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}
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}
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self.ed.render(&mut stdout)?;
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}
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}
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/// Handle ANSI Escape
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fn escape(&mut self) -> ReplResult<()> {
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fn escape<W: Write>(&mut self, w: &mut W) -> ReplResult<()> {
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match self.input.next().ok_or(Error::EndOfInput)?? {
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'[' => self.csi()?,
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'[' => self.csi(w)?,
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'O' => todo!("Process alternate character mode"),
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other => self.ed.extend(['\x1b', other]),
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other => self.ed.extend(['\x1b', other], w)?,
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}
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Ok(())
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}
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/// Handle ANSI Control Sequence Introducer
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fn csi(&mut self) -> ReplResult<()> {
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fn csi<W: Write>(&mut self, w: &mut W) -> ReplResult<()> {
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match self.input.next().ok_or(Error::EndOfInput)?? {
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'A' => {
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self.hindex = self.hindex.saturating_sub(1);
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self.restore_history();
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self.restore_history(w)?
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}
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'B' => {
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self.hindex = self
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.hindex
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.saturating_add(1)
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.min(self.history.len().saturating_sub(1));
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self.restore_history();
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self.restore_history(w)?
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}
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'C' => self.ed.cursor_back(1).ignore(),
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'D' => self.ed.cursor_forward(1).ignore(),
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'C' => self.ed.cursor_forward(1, w)?,
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'D' => self.ed.cursor_back(1, w)?,
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'H' => self.ed.home(w)?,
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'F' => self.ed.end(w)?,
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'3' => {
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if let '~' = self.input.next().ok_or(Error::EndOfInput)?? {
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self.ed.delete().ignore()
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self.ed.delete(w).ignore()
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}
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}
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other => {
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eprintln!("{other}");
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eprint!("{}", other.escape_unicode());
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}
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}
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Ok(())
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}
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/// Restores the currently selected history
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pub fn restore_history(&mut self) {
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pub fn restore_history<W: Write>(&mut self, w: &mut W) -> ReplResult<()> {
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let Self { history, hindex, ed, .. } = self;
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if !(0..history.len()).contains(hindex) {
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return;
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return Ok(());
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};
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ed.undraw(w)?;
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ed.clear();
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ed.print_head(w)?;
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ed.extend(
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history
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.get(*hindex)
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.expect("history should contain index")
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.trim_end_matches(|c: char| c != '\n' && c.is_whitespace())
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.chars(),
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);
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w,
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)
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}
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/// Append line to history and clear it
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@ -323,7 +326,10 @@ impl<'a, R: Read> Repline<'a, R> {
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self.hindex = self.history.len();
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}
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/// Append line to history
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pub fn history_append(&mut self, buf: String) {
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pub fn history_append(&mut self, mut buf: String) {
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while buf.ends_with(char::is_whitespace) {
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buf.pop();
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}
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if !self.history.contains(&buf) {
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self.history.push_back(buf)
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}
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@ -344,10 +350,25 @@ impl<'a> Repline<'a, std::io::Stdin> {
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}
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pub mod editor {
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use crossterm::{cursor::*, execute, queue, style::*, terminal::*};
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use std::{collections::VecDeque, fmt::Display, io::Write};
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use super::error::{Error, ReplResult};
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fn is_newline(c: &char) -> bool {
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*c == '\n'
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}
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fn write_chars<'a, W: Write>(
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c: impl IntoIterator<Item = &'a char>,
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w: &mut W,
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) -> std::io::Result<()> {
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for c in c {
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write!(w, "{c}")?;
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}
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Ok(())
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}
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#[derive(Debug)]
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pub struct Editor<'a> {
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head: VecDeque<char>,
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@ -365,16 +386,17 @@ pub mod editor {
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pub fn iter(&self) -> impl Iterator<Item = &char> {
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self.head.iter()
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}
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pub fn begin_frame<W: Write>(&self, w: &mut W) -> ReplResult<()> {
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pub fn undraw<W: Write>(&self, w: &mut W) -> ReplResult<()> {
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let Self { head, .. } = self;
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match head.iter().filter(|&&c| c == '\n').count() {
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match head.iter().copied().filter(is_newline).count() {
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0 => write!(w, "\x1b[0G"),
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lines => write!(w, "\x1b[{}F", lines),
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}?;
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write!(w, "\x1b[0J")?;
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queue!(w, Clear(ClearType::FromCursorDown))?;
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// write!(w, "\x1b[0J")?;
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Ok(())
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}
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pub fn render<W: Write>(&self, w: &mut W) -> ReplResult<()> {
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pub fn redraw<W: Write>(&self, w: &mut W) -> ReplResult<()> {
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let Self { head, tail, color, begin, again } = self;
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write!(w, "{color}{begin}\x1b[0m ")?;
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// draw head
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@ -385,7 +407,7 @@ pub mod editor {
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}?
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}
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// save cursor
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write!(w, "\x1b[s")?;
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execute!(w, SavePosition)?;
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// draw tail
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for c in tail {
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match c {
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@ -394,7 +416,99 @@ pub mod editor {
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}?
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}
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// restore cursor
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w.write_all(b"\x1b[u").map_err(Into::into)
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execute!(w, RestorePosition)?;
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Ok(())
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}
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pub fn prompt<W: Write>(&self, w: &mut W) -> ReplResult<()> {
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let Self { head, color, begin, again, .. } = self;
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queue!(
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w,
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MoveToColumn(0),
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Print(color),
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Print(if head.is_empty() { begin } else { again }),
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ResetColor,
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Print(' '),
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)?;
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Ok(())
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}
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pub fn print_head<W: Write>(&self, w: &mut W) -> ReplResult<()> {
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self.prompt(w)?;
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write_chars(
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self.head.iter().skip(
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self.head
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.iter()
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.rposition(is_newline)
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.unwrap_or(self.head.len())
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+ 1,
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),
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w,
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)?;
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Ok(())
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}
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pub fn print_tail<W: Write>(&self, w: &mut W) -> ReplResult<()> {
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let Self { tail, .. } = self;
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queue!(w, SavePosition, Clear(ClearType::UntilNewLine))?;
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write_chars(tail.iter().take_while(|&c| !is_newline(c)), w)?;
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queue!(w, RestorePosition)?;
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Ok(())
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}
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pub fn push<W: Write>(&mut self, c: char, w: &mut W) -> ReplResult<()> {
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// Tail optimization: if the tail is empty,
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//we don't have to undraw and redraw on newline
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if self.tail.is_empty() {
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self.head.push_back(c);
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match c {
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'\n' => {
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write!(w, "\r\n")?;
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self.print_head(w)?;
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}
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c => {
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queue!(w, Print(c))?;
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}
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};
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return Ok(());
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}
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if '\n' == c {
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self.undraw(w)?;
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}
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self.head.push_back(c);
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match c {
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'\n' => self.redraw(w)?,
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_ => {
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write!(w, "{c}")?;
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self.print_tail(w)?;
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}
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}
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Ok(())
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}
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pub fn pop<W: Write>(&mut self, w: &mut W) -> ReplResult<Option<char>> {
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if let Some('\n') = self.head.back() {
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self.undraw(w)?;
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}
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let c = self.head.pop_back();
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// if the character was a newline, we need to go back a line
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match c {
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Some('\n') => self.redraw(w)?,
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Some(_) => {
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// go back a char
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queue!(w, MoveLeft(1), Print(' '), MoveLeft(1))?;
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self.print_tail(w)?;
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}
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None => {}
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}
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Ok(c)
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}
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pub fn extend<T: IntoIterator<Item = char>, W: Write>(
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&mut self,
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iter: T,
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w: &mut W,
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) -> ReplResult<()> {
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for c in iter {
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self.push(c, w)?;
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}
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Ok(())
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}
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pub fn restore(&mut self, s: &str) {
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self.clear();
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@ -404,15 +518,21 @@ pub mod editor {
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self.head.clear();
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self.tail.clear();
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}
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pub fn push(&mut self, c: char) -> ReplResult<()> {
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self.head.push_back(c);
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Ok(())
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pub fn delete<W: Write>(&mut self, w: &mut W) -> ReplResult<char> {
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match self.tail.front() {
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Some('\n') => {
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self.undraw(w)?;
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let out = self.tail.pop_front();
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self.redraw(w)?;
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out
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}
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pub fn pop(&mut self) -> ReplResult<char> {
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self.head.pop_back().ok_or(Error::EndOfInput)
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_ => {
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let out = self.tail.pop_front();
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self.print_tail(w)?;
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out
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}
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pub fn delete(&mut self) -> ReplResult<char> {
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self.tail.pop_front().ok_or(Error::EndOfInput)
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}
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.ok_or(Error::EndOfInput)
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}
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pub fn len(&self) -> usize {
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self.head.len() + self.tail.len()
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@ -433,26 +553,56 @@ pub mod editor {
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}
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}
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/// Moves the cursor back `steps` steps
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pub fn cursor_forward(&mut self, steps: usize) -> Option<()> {
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let Self { head, tail, .. } = self;
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pub fn cursor_back<W: Write>(&mut self, steps: usize, w: &mut W) -> ReplResult<()> {
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for _ in 0..steps {
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tail.push_front(head.pop_back()?);
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if let Some('\n') = self.head.back() {
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self.undraw(w)?;
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}
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Some(())
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let Some(c) = self.head.pop_back() else {
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return Ok(());
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};
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self.tail.push_front(c);
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match c {
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'\n' => self.redraw(w)?,
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_ => queue!(w, MoveLeft(1))?,
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}
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}
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Ok(())
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}
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/// Moves the cursor forward `steps` steps
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pub fn cursor_back(&mut self, steps: usize) -> Option<()> {
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let Self { head, tail, .. } = self;
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pub fn cursor_forward<W: Write>(&mut self, steps: usize, w: &mut W) -> ReplResult<()> {
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for _ in 0..steps {
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head.push_back(tail.pop_front()?);
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if let Some('\n') = self.tail.front() {
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self.undraw(w)?
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}
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Some(())
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let Some(c) = self.tail.pop_front() else {
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return Ok(());
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};
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self.head.push_back(c);
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match c {
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'\n' => self.redraw(w)?,
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_ => queue!(w, MoveRight(1))?,
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}
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}
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Ok(())
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}
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/// Goes to the beginning of the current line
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pub fn home<W: Write>(&mut self, w: &mut W) -> ReplResult<()> {
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loop {
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match self.head.back() {
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Some('\n') | None => break Ok(()),
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Some(_) => self.cursor_back(1, w)?,
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}
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}
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}
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/// Goes to the end of the current line
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pub fn end<W: Write>(&mut self, w: &mut W) -> ReplResult<()> {
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loop {
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match self.tail.front() {
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Some('\n') | None => break Ok(()),
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Some(_) => self.cursor_forward(1, w)?,
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}
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}
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impl<'a> Extend<char> for Editor<'a> {
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fn extend<T: IntoIterator<Item = char>>(&mut self, iter: T) {
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self.head.extend(iter)
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}
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}
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