416 lines
15 KiB
Rust
416 lines
15 KiB
Rust
use std::{arch::asm, os::fd::BorrowedFd};
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use keys::KeyEvent;
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use line::{strip_ansi_codes_and_escapes, LineBuf};
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use linecmd::{Anchor, At, CharSearch, InputMode, LineCmd, MoveCmd, Movement, Verb, VerbCmd, ViCmd, ViCmdBuilder, Word};
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use nix::{libc::STDIN_FILENO, sys::termios::{self, Termios}, unistd::read};
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use term::Terminal;
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use unicode_width::UnicodeWidthStr;
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use crate::{libsh::{error::{ShErr, ShErrKind, ShResult}, sys::sh_quit}, prelude::*};
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pub mod term;
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pub mod line;
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pub mod keys;
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pub mod linecmd;
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/// Add a verb to a specified ViCmdBuilder, then build it
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///
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/// Returns the built value as a LineCmd::ViCmd
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macro_rules! build_verb {
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($cmd:expr,$verb:expr) => {{
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$cmd.with_verb($verb).build().map(|cmd| LineCmd::ViCmd(cmd))
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}}
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}
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/// Add a movement to a specified ViCmdBuilder, then build it
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///
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/// Returns the built value as a LineCmd::ViCmd
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macro_rules! build_movement {
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($cmd:expr,$move:expr) => {{
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$cmd.with_movement($move).build().map(|cmd| LineCmd::ViCmd(cmd))
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}}
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}
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/// Add both a movement and a verb to a specified ViCmdBuilder, then build it
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///
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/// Returns the built value as a LineCmd::ViCmd
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macro_rules! build_moveverb {
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($cmd:expr,$verb:expr,$move:expr) => {{
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$cmd.with_movement($move).with_verb($verb).build().map(|cmd| LineCmd::ViCmd(cmd))
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}}
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}
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#[derive(Default,Debug)]
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pub struct FernReader {
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pub term: Terminal,
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pub prompt: String,
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pub line: LineBuf,
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pub edit_mode: InputMode,
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pub count_arg: u16,
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pub last_effect: Option<VerbCmd>,
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pub last_movement: Option<MoveCmd>
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}
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impl FernReader {
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pub fn new(prompt: String) -> Self {
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let line = LineBuf::new().with_initial("The quick brown fox jumped over the lazy dog.");
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Self {
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term: Terminal::new(),
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prompt,
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line,
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edit_mode: Default::default(),
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count_arg: Default::default(),
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last_effect: Default::default(),
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last_movement: Default::default(),
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}
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}
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fn pack_line(&mut self) -> String {
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self.line
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.buffer
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.iter()
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.collect::<String>()
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}
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pub fn readline(&mut self) -> ShResult<String> {
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self.display_line(/*refresh: */ false);
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loop {
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let cmd = self.next_cmd()?;
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if cmd == LineCmd::AcceptLine {
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return Ok(self.pack_line())
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}
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self.execute_cmd(cmd)?;
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self.display_line(/* refresh: */ true);
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}
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}
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fn clear_line(&self) {
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let prompt_lines = self.prompt.lines().count();
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let buf_lines = self.line.count_lines().saturating_sub(1); // One of the buffer's lines will overlap with the prompt. probably.
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let total = prompt_lines + buf_lines;
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self.term.write_bytes(b"\r\n");
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for _ in 0..total {
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self.term.write_bytes(b"\r\x1b[2K\x1b[1A");
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}
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self.term.write_bytes(b"\r\x1b[2K");
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}
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fn display_line(&mut self, refresh: bool) {
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if refresh {
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self.clear_line();
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}
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let mut prompt_lines = self.prompt.lines().peekable();
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let mut last_line_len = 0;
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let lines = self.line.display_lines();
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while let Some(line) = prompt_lines.next() {
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if prompt_lines.peek().is_none() {
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last_line_len = strip_ansi_codes_and_escapes(line).width();
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self.term.write(line);
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} else {
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self.term.writeln(line);
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}
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}
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let num_lines = lines.len();
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let mut lines_iter = lines.into_iter().peekable();
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while let Some(line) = lines_iter.next() {
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if lines_iter.peek().is_some() {
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self.term.writeln(&line);
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} else {
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self.term.write(&line);
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}
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}
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if num_lines == 1 {
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let cursor_offset = self.line.cursor() + last_line_len;
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self.term.write(&format!("\r\x1b[{}C", cursor_offset));
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} else {
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let (x, y) = self.line.cursor_display_coords();
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// Y-axis movements are 1-indexed and must move up from the bottom
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// Therefore, add 1 to Y and subtract that number from the number of lines
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// to find the number of times we have to push the cursor upward
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let y = num_lines.saturating_sub(y+1);
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if y > 0 {
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self.term.write(&format!("\r\x1b[{}A", y))
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}
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self.term.write(&format!("\r\x1b[{}C", x+2)); // Factor in the line bullet thing
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}
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match self.edit_mode {
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InputMode::Replace |
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InputMode::Insert => {
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self.term.write("\x1b[6 q")
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}
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InputMode::Normal |
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InputMode::Visual => {
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self.term.write("\x1b[2 q")
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}
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}
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}
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pub fn next_cmd(&mut self) -> ShResult<LineCmd> {
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let vi_cmd = ViCmdBuilder::new();
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match self.edit_mode {
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InputMode::Normal => self.get_normal_cmd(vi_cmd),
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InputMode::Insert => self.get_insert_cmd(vi_cmd),
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InputMode::Visual => todo!(),
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InputMode::Replace => todo!(),
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}
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}
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pub fn get_insert_cmd(&mut self, pending_cmd: ViCmdBuilder) -> ShResult<LineCmd> {
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use keys::{KeyEvent as E, KeyCode as K, ModKeys as M};
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let key = self.term.read_key();
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let cmd = match key {
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E(K::Char(ch), M::NONE) => build_verb!(pending_cmd, Verb::InsertChar(ch))?,
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E(K::Char('H'), M::CTRL) |
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E(K::Backspace, M::NONE) => LineCmd::backspace(),
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E(K::BackTab, M::NONE) => LineCmd::CompleteBackward,
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E(K::Char('I'), M::CTRL) |
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E(K::Tab, M::NONE) => LineCmd::Complete,
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E(K::Esc, M::NONE) => {
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self.edit_mode = InputMode::Normal;
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build_movement!(pending_cmd, Movement::BackwardChar)?
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}
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E(K::Char('D'), M::CTRL) => LineCmd::EndOfFile,
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_ => {
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flog!(INFO, "unhandled key in get_insert_cmd, trying common_cmd...");
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return self.common_cmd(key, pending_cmd)
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}
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};
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Ok(cmd)
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}
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pub fn get_normal_cmd(&mut self, mut pending_cmd: ViCmdBuilder) -> ShResult<LineCmd> {
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use keys::{KeyEvent as E, KeyCode as K, ModKeys as M};
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let key = self.term.read_key();
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if let E(K::Char(ch), M::NONE) = key {
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if pending_cmd.movement().is_some_and(|m| matches!(m, Movement::CharSearch(_))) {
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let Movement::CharSearch(charsearch) = pending_cmd.movement().unwrap() else {unreachable!()};
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match charsearch {
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CharSearch::FindFwd(_) => {
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let finalized = CharSearch::FindFwd(Some(ch));
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return build_movement!(pending_cmd, Movement::CharSearch(finalized))
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}
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CharSearch::FwdTo(_) => {
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let finalized = CharSearch::FwdTo(Some(ch));
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return build_movement!(pending_cmd, Movement::CharSearch(finalized))
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}
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CharSearch::FindBkwd(_) => {
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let finalized = CharSearch::FindBkwd(Some(ch));
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return build_movement!(pending_cmd, Movement::CharSearch(finalized))
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}
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CharSearch::BkwdTo(_) => {
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let finalized = CharSearch::BkwdTo(Some(ch));
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return build_movement!(pending_cmd, Movement::CharSearch(finalized))
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}
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}
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}
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}
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if let E(K::Char(digit @ '0'..='9'), M::NONE) = key {
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pending_cmd.append_digit(digit);
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return self.get_normal_cmd(pending_cmd);
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}
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let cmd = match key {
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E(K::Char('h'), M::NONE) => {
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let cmd = pending_cmd
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.with_movement(Movement::BackwardChar)
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.build()?;
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LineCmd::ViCmd(cmd)
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}
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E(K::Char('j'), M::NONE) => LineCmd::LineDownOrNextHistory,
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E(K::Char('k'), M::NONE) => LineCmd::LineUpOrPreviousHistory,
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E(K::Char('D'), M::NONE) => build_moveverb!(pending_cmd,Verb::Delete,Movement::EndOfLine)?,
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E(K::Char('C'), M::NONE) => build_moveverb!(pending_cmd,Verb::Change,Movement::EndOfLine)?,
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E(K::Char('Y'), M::NONE) => build_moveverb!(pending_cmd,Verb::Yank,Movement::EndOfLine)?,
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E(K::Char('l'), M::NONE) => build_movement!(pending_cmd,Movement::ForwardChar)?,
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E(K::Char('w'), M::NONE) => build_movement!(pending_cmd,Movement::ForwardWord(At::Start, Word::Normal))?,
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E(K::Char('W'), M::NONE) => build_movement!(pending_cmd,Movement::ForwardWord(At::Start, Word::Big))?,
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E(K::Char('b'), M::NONE) => build_movement!(pending_cmd,Movement::BackwardWord(Word::Normal))?,
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E(K::Char('B'), M::NONE) => build_movement!(pending_cmd,Movement::BackwardWord(Word::Big))?,
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E(K::Char('e'), M::NONE) => build_movement!(pending_cmd,Movement::ForwardWord(At::BeforeEnd, Word::Normal))?,
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E(K::Char('E'), M::NONE) => build_movement!(pending_cmd,Movement::ForwardWord(At::BeforeEnd, Word::Big))?,
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E(K::Char('^'), M::NONE) => build_movement!(pending_cmd,Movement::BeginningOfFirstWord)?,
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E(K::Char('0'), M::NONE) => build_movement!(pending_cmd,Movement::BeginningOfLine)?,
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E(K::Char('$'), M::NONE) => build_movement!(pending_cmd,Movement::EndOfLine)?,
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E(K::Char('x'), M::NONE) => build_verb!(pending_cmd,Verb::DeleteOne(Anchor::After))?,
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E(K::Char('o'), M::NONE) => {
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self.edit_mode = InputMode::Insert;
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build_verb!(pending_cmd,Verb::Breakline(Anchor::After))?
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}
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E(K::Char('O'), M::NONE) => {
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self.edit_mode = InputMode::Insert;
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build_verb!(pending_cmd,Verb::Breakline(Anchor::Before))?
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}
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E(K::Char('i'), M::NONE) => {
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self.edit_mode = InputMode::Insert;
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LineCmd::Null
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}
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E(K::Char('I'), M::NONE) => {
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self.edit_mode = InputMode::Insert;
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build_movement!(pending_cmd,Movement::BeginningOfFirstWord)?
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}
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E(K::Char('a'), M::NONE) => {
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self.edit_mode = InputMode::Insert;
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build_movement!(pending_cmd,Movement::ForwardChar)?
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}
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E(K::Char('A'), M::NONE) => {
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self.edit_mode = InputMode::Insert;
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build_movement!(pending_cmd,Movement::EndOfLine)?
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}
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E(K::Char('c'), M::NONE) => {
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if pending_cmd.verb() == Some(&Verb::Change) {
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build_moveverb!(pending_cmd,Verb::Change,Movement::WholeLine)?
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} else {
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pending_cmd = pending_cmd.with_verb(Verb::Change);
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self.get_normal_cmd(pending_cmd)?
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}
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}
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E(K::Char('>'), M::NONE) => {
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if pending_cmd.verb() == Some(&Verb::Indent) {
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build_verb!(pending_cmd,Verb::Indent)?
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} else {
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pending_cmd = pending_cmd.with_verb(Verb::Indent);
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self.get_normal_cmd(pending_cmd)?
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}
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}
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E(K::Char('<'), M::NONE) => {
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if pending_cmd.verb() == Some(&Verb::Dedent) {
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build_verb!(pending_cmd,Verb::Dedent)?
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} else {
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pending_cmd = pending_cmd.with_verb(Verb::Dedent);
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self.get_normal_cmd(pending_cmd)?
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}
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}
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E(K::Char('d'), M::NONE) => {
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if pending_cmd.verb() == Some(&Verb::Delete) {
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LineCmd::ViCmd(pending_cmd.with_movement(Movement::WholeLine).build()?)
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} else {
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pending_cmd = pending_cmd.with_verb(Verb::Delete);
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self.get_normal_cmd(pending_cmd)?
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}
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}
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E(K::Char('f'), M::NONE) => {
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pending_cmd = pending_cmd.with_movement(Movement::CharSearch(CharSearch::FindFwd(None)));
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self.get_normal_cmd(pending_cmd)?
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}
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E(K::Char('F'), M::NONE) => {
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pending_cmd = pending_cmd.with_movement(Movement::CharSearch(CharSearch::FindBkwd(None)));
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self.get_normal_cmd(pending_cmd)?
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}
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E(K::Char('t'), M::NONE) => {
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pending_cmd = pending_cmd.with_movement(Movement::CharSearch(CharSearch::FwdTo(None)));
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self.get_normal_cmd(pending_cmd)?
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}
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E(K::Char('T'), M::NONE) => {
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pending_cmd = pending_cmd.with_movement(Movement::CharSearch(CharSearch::BkwdTo(None)));
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self.get_normal_cmd(pending_cmd)?
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}
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_ => {
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flog!(INFO, "unhandled key in get_normal_cmd, trying common_cmd...");
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return self.common_cmd(key, pending_cmd)
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}
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};
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Ok(cmd)
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}
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pub fn common_cmd(&mut self, key: KeyEvent, pending_cmd: ViCmdBuilder) -> ShResult<LineCmd> {
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use keys::{KeyEvent as E, KeyCode as K, ModKeys as M};
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match key {
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E(K::Home, M::NONE) => build_movement!(pending_cmd,Movement::BeginningOfLine),
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E(K::End, M::NONE) => build_movement!(pending_cmd,Movement::EndOfLine),
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E(K::Left, M::NONE) => build_movement!(pending_cmd,Movement::BackwardChar),
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E(K::Right, M::NONE) => build_movement!(pending_cmd,Movement::ForwardChar),
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E(K::Delete, M::NONE) => build_moveverb!(pending_cmd,Verb::Delete,Movement::ForwardChar),
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E(K::Up, M::NONE) => Ok(LineCmd::LineUpOrPreviousHistory),
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E(K::Down, M::NONE) => Ok(LineCmd::LineDownOrNextHistory),
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E(K::Enter, M::NONE) => Ok(LineCmd::AcceptLine),
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E(K::Backspace, M::NONE) |
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E(K::Char('h'), M::CTRL) => {
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Ok(LineCmd::backspace())
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}
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_ => Err(ShErr::simple(ShErrKind::ReadlineErr,format!("Unhandled common key event: {key:?}")))
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}
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}
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pub fn exec_vi_cmd(&mut self, cmd: ViCmd) -> ShResult<()> {
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match cmd {
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ViCmd::MoveVerb(verb_cmd, move_cmd) => {
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self.last_effect = Some(verb_cmd.clone());
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self.last_movement = Some(move_cmd.clone());
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let VerbCmd { verb_count, verb } = verb_cmd;
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for _ in 0..verb_count {
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self.line.exec_vi_cmd(Some(verb.clone()), Some(move_cmd.clone()))?;
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}
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if verb == Verb::Change {
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self.edit_mode = InputMode::Insert
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}
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}
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ViCmd::Verb(verb_cmd) => {
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self.last_effect = Some(verb_cmd.clone());
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let VerbCmd { verb_count, verb } = verb_cmd;
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for _ in 0..verb_count {
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self.line.exec_vi_cmd(Some(verb.clone()), None)?;
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}
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}
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ViCmd::Move(move_cmd) => {
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self.last_movement = Some(move_cmd.clone());
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self.line.exec_vi_cmd(None, Some(move_cmd))?;
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}
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}
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Ok(())
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}
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pub fn execute_cmd(&mut self, cmd: LineCmd) -> ShResult<()> {
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match cmd {
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LineCmd::ViCmd(cmd) => self.exec_vi_cmd(cmd)?,
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LineCmd::Abort => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::BeginningOfHistory => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::CapitalizeWord => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::ClearScreen => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::Complete => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::CompleteBackward => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::CompleteHint => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::DowncaseWord => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::EndOfFile => {
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if self.line.buffer.is_empty() {
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sh_quit(0);
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} else {
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self.line.clear();
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}
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}
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LineCmd::EndOfHistory => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::ForwardSearchHistory => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::HistorySearchBackward => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::HistorySearchForward => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::Insert(_) => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::Interrupt => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::Move(_) => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::NextHistory => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::Noop => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::Repaint => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::Overwrite(ch) => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::PreviousHistory => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::QuotedInsert => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::ReverseSearchHistory => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::Suspend => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::TransposeChars => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::TransposeWords => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::Unknown => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::YankPop => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::LineUpOrPreviousHistory => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::LineDownOrNextHistory => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::Newline => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::AcceptOrInsertLine { .. } => todo!("Unhandled cmd: {cmd:?}"),
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LineCmd::Null => { /* Pass */ }
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_ => todo!("Unhandled cmd: {cmd:?}"),
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}
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Ok(())
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}
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}
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impl Drop for FernReader {
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fn drop(&mut self) {
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self.term.write("\x1b[2 q");
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}
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}
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