mitsuo_makuda/linutil
1
0
Fork 0
mirror of https://github.com/ChrisTitusTech/linutil.git synced 2024-12-23 20:09:44 +00:00
Code Issues Packages Projects Releases Wiki Activity

Added passthrough to the terminal child process

Browse Source
This commit is contained in:
Andrii Dokhniak 2024-07-12 00:58:27 +02:00
parent 15e9c8ebe4
commit 7f2e59ad7a
4 changed files with 135 additions and 70 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

BIN
linutil
View File

Binary file not shown.

11
src/list.rs
View File

@ -1,4 +1,3 @@
use crate::theme::*;
use crossterm::event::{KeyCode, KeyEvent, KeyEventKind};
use ego_tree::{tree, NodeId};
@ -29,8 +28,6 @@ pub struct CustomList {
}
impl CustomList {
/// It's really easy to make this accept a tree, and make it reusable, but rn its only called
/// once, so I didn't bother, and it gets initialized here
pub fn new() -> Self {
// When a function call ends with an exclamation mark, it means it's a macro, like in this
// case the tree! macro expands to `ego-tree::tree` data structure
@ -38,6 +35,14 @@ impl CustomList {
name: "root",
command: ""
} => {
ListNode {
name: "Full bash",
command: "bash"
},
ListNode {
name: "Full zsh",
command: "zsh"
},
ListNode {
name: "Setup Bash Prompt",
command: "bash -c \"$(curl -s https://raw.githubusercontent.com/ChrisTitusTech/mybash/main/setup.sh)\""

67
src/main.rs
View File

@ -11,7 +11,7 @@ use std::{
use clap::Parser;
use crossterm::{
cursor::RestorePosition,
event::{self, DisableMouseCapture, Event, KeyCode, KeyEventKind, KeyModifiers},
event::{self, DisableMouseCapture, Event, KeyCode, KeyEventKind},
style::ResetColor,
terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
ExecutableCommand,
@ -60,43 +60,7 @@ fn run<B: Backend>(terminal: &mut Terminal<B>) -> io::Result<()> {
let mut custom_list = CustomList::new();
loop {
// If currently running a command, display the command window, else display only the list
// Event read is blocking
if event::poll(Duration::from_millis(10))? {
// It's guaranteed that the `read()` won't block when the `poll()`
// function returns `true`
if let Event::Key(key) = event::read()? {
// We are only interested in Press and Repeat events
if key.kind == KeyEventKind::Press || key.kind == KeyEventKind::Repeat {
// Only process list inputs when a command is not running
if let None = command_opt {
if let Some(cmd) = custom_list.handle_key(key) {
command_opt = Some(RunningCommand::new(cmd));
}
}
// In the future we might want to add key handling for the running command, and
// we would put it here
match key.code {
KeyCode::Char('q') => return Ok(()),
KeyCode::Char('c') if key.modifiers.contains(KeyModifiers::CONTROL) => {
if let Some(ref mut command) = command_opt {
command.kill_child();
}
}
KeyCode::Enter => {
if let Some(ref mut command) = command_opt {
if command.is_finished() {
command_opt = None;
}
}
}
_ => (),
};
}
}
}
// Always redraw
terminal
.draw(|frame| {
custom_list.draw(frame, frame.size());
@ -105,5 +69,32 @@ fn run<B: Backend>(terminal: &mut Terminal<B>) -> io::Result<()> {
}
})
.unwrap();
// Wait for an event
if !event::poll(Duration::from_millis(10))? {
continue;
}
// It's guaranteed that the `read()` won't block when the `poll()`
// function returns `true`
if let Event::Key(key) = event::read()? {
// We are only interested in Press and Repeat events
if key.kind != KeyEventKind::Press && key.kind != KeyEventKind::Repeat {
continue;
}
if let Some(ref mut command) = command_opt {
if command.handle_key_event(&key) {
command_opt = None;
}
} else {
if key.code == KeyCode::Char('q') {
return Ok(());
}
if let Some(cmd) = custom_list.handle_key(key) {
command_opt = Some(RunningCommand::new(cmd));
}
}
}
}
}

127
src/running_command.rs
View File

@ -1,15 +1,17 @@
use std::{
io::Write,
sync::{Arc, Mutex},
thread::JoinHandle,
};
use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
use oneshot::{channel, Receiver};
use portable_pty::{
ChildKiller, CommandBuilder, ExitStatus, MasterPty, NativePtySystem, PtySize, PtySystem,
};
use ratatui::{
layout::Size,
style::{Color, Style, Styled, Stylize},
style::{Color, Style, Stylize},
text::{Line, Span},
widgets::{Block, Borders},
Frame,
@ -21,26 +23,30 @@ use tui_term::{
use crate::{float::floating_window, theme::get_theme};
// This is a struct for stoaring everything connected to a running command
/// This is a struct for storing everything connected to a running command
// Create a new instance on every new command you want to run
pub struct RunningCommand {
buffer: Arc<Mutex<Vec<u8>>>, // A buffer to save all the command output (accumulates, untill the command
// exits)
command_thread: Option<JoinHandle<ExitStatus>>, // the tread where the command is being executed
child_killer: Option<Receiver<Box<dyn ChildKiller + Send + Sync>>>, // This is a thing that
// will allow us to kill the running command on Ctrl-C
// Also, don't mind the name :)
/// A buffer to save all the command output (accumulates, untill the command exits)
buffer: Arc<Mutex<Vec<u8>>>,
//It is an option, because we want to be able to .join it, without
// moving the whole RunningCommand struct, (we want to have the exit code, and still have acess
// to the buffer, to render the terminal output)
_reader_thread: JoinHandle<()>, // The thread that reads the command output, and sends it to us
// by writing to the buffer. We need another thread, because the reader may block, and we want
// our UI to stay responsive.
pty_master: Box<dyn MasterPty + Send>, // This is a master handle of the emulated terminal, we
// will use it to resize the emulated terminal
status: Option<ExitStatus>, // We want to be able to get the exit status more then once, and
// this is a nice place to store it. We will put it here, after joining the reader_tread
/// A handle of the tread where the command is being executed
command_thread: Option<JoinHandle<ExitStatus>>,
/// A handle to kill the running process, it's an option because it can only be used once
child_killer: Option<Receiver<Box<dyn ChildKiller + Send + Sync>>>,
/// A join handle for the thread that is reading all the command output and sending it to the
/// main thread
_reader_thread: JoinHandle<()>,
/// Virtual terminal (pty) handle, used for resizing the pty
pty_master: Box<dyn MasterPty + Send>,
/// Used for sending keys to the emulated terminal
writer: Box<dyn Write + Send>,
/// Only set after the process has ended
status: Option<ExitStatus>,
}
impl RunningCommand {
@ -72,19 +78,15 @@ impl RunningCommand {
});
let mut reader = pair.master.try_clone_reader().unwrap(); // This is a reader, this is where we
// are reading the command output from
// This is a bit complicated, but I will try my best to explain :)
// Arc<Mutex<>> Means that this object is an Async Reference Count (Arc) Mutex lock. We
// need the ark part, because when all references holding that ark go out of scope, we want
// the memory to get freed. Mutex is to allow us to write and read to the memory from
// different threads, without fear that some thread will be reading when other is writing
// A buffer, shared between the thread that reads the command output, and the main tread.
// The main thread only reads the contents
let command_buffer: Arc<Mutex<Vec<u8>>> = Arc::new(Mutex::new(Vec::new()));
let reader_handle = {
// Arc is just a reference, so we can create an owned copy without any problem
let command_buffer = command_buffer.clone();
// The closure below moves all variables used into it, so we can no longer use them,
// thats why command_buffer.clone(), because we need to use command_buffer later
// that's why command_buffer.clone(), because we need to use command_buffer later
std::thread::spawn(move || {
let mut buf = [0u8; 8192];
loop {
@ -100,12 +102,15 @@ impl RunningCommand {
}
})
};
let writer = pair.master.take_writer().unwrap();
Self {
buffer: command_buffer,
command_thread: Some(command_handle),
child_killer: Some(rx),
_reader_thread: reader_handle,
pty_master: pair.master,
writer,
status: None,
}
}
@ -121,7 +126,7 @@ impl RunningCommand {
.unwrap();
// Process the buffer with a parser with the current screen size
// We don't actually need to create a new parser every time, but it is so much easyer this
// We don't actually need to create a new parser every time, but it is so much easier this
// way, and doesn't cost that much
let mut parser = vt100::Parser::new(size.height, size.width, 0);
let mutex = self.buffer.lock();
@ -150,7 +155,6 @@ impl RunningCommand {
pub fn draw(&mut self, frame: &mut Frame) {
{
let theme = get_theme();
// Funny name
let floater = floating_window(frame.size());
@ -202,12 +206,77 @@ impl RunningCommand {
frame.render_widget(pseudo_term, floater);
}
}
/// From what I observed this sends SIGHUB signal, *not* SIGKILL or SIGTERM, so the process
/// doesn't get a chance to clean up. If neccesary, I can look into sending SIGTERM directly
/// Send SIGHUB signal, *not* SIGKILL or SIGTERM, to the child process
pub fn kill_child(&mut self) {
if !self.is_finished() {
let mut killer = self.child_killer.take().unwrap().recv().unwrap();
killer.kill().unwrap();
}
}
/// Handle key events of the running command "window". Returns true when the "window" should be
/// closed
pub fn handle_key_event(&mut self, key: &KeyEvent) -> bool {
match key.code {
KeyCode::Char('c') if key.modifiers.contains(KeyModifiers::CONTROL) => {
self.kill_child()
}
KeyCode::Enter if self.is_finished() => {
return true;
}
_ => self.handle_passthrough_key_event(key),
};
false
}
/// Convert the KeyEvent to pty key codes, and send them to the virtual terminal
fn handle_passthrough_key_event(&mut self, key: &KeyEvent) {
let input_bytes = match key.code {
KeyCode::Char(ch) => {
let mut send = vec![ch as u8];
let upper = ch.to_ascii_uppercase();
if key.modifiers == KeyModifiers::CONTROL {
match upper {
// https://github.com/fyne-io/terminal/blob/master/input.go
// https://gist.github.com/ConnerWill/d4b6c776b509add763e17f9f113fd25b
'2' | '@' | ' ' => send = vec![0],
'3' | '[' => send = vec![27],
'4' | '\\' => send = vec![28],
'5' | ']' => send = vec![29],
'6' | '^' => send = vec![30],
'7' | '-' | '_' => send = vec![31],
char if ('A'..='_').contains(&char) => {
// Since A == 65,
// we can safely subtract 64 to get
// the corresponding control character
let ascii_val = char as u8;
let ascii_to_send = ascii_val - 64;
send = vec![ascii_to_send];
}
_ => {}
}
}
send
}
KeyCode::Enter => vec![b'\n'],
KeyCode::Backspace => vec![8],
KeyCode::Left => vec![27, 91, 68],
KeyCode::Right => vec![27, 91, 67],
KeyCode::Up => vec![27, 91, 65],
KeyCode::Down => vec![27, 91, 66],
KeyCode::Tab => vec![9],
KeyCode::Home => vec![27, 91, 72],
KeyCode::End => vec![27, 91, 70],
KeyCode::PageUp => vec![27, 91, 53, 126],
KeyCode::PageDown => vec![27, 91, 54, 126],
KeyCode::BackTab => vec![27, 91, 90],
KeyCode::Delete => vec![27, 91, 51, 126],
KeyCode::Insert => vec![27, 91, 50, 126],
KeyCode::Esc => vec![27],
_ => return,
};
// Send the keycodes to the virtual terminal
let _ = self.writer.write_all(&input_bytes);
}
}