magi-code 0.96.2

Repository-aware CLI coding agent for terminal work
Documentation 
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pub(in crate::tui) mod graphics;
pub(in crate::tui) mod panic_hook;
pub(in crate::tui) mod synchronized_output;

use anyhow::Result;
use crossterm::{
    cursor::SetCursorStyle,
    event::{
        DisableBracketedPaste, DisableMouseCapture, EnableBracketedPaste, EnableMouseCapture,
        KeyboardEnhancementFlags, PopKeyboardEnhancementFlags, PushKeyboardEnhancementFlags,
    },
    execute,
    terminal::{
        EndSynchronizedUpdate, EnterAlternateScreen, LeaveAlternateScreen, disable_raw_mode,
        enable_raw_mode,
    },
};
use std::io;

const ENHANCED_KEYBOARD_FLAGS: KeyboardEnhancementFlags =
    KeyboardEnhancementFlags::DISAMBIGUATE_ESCAPE_CODES
        .union(KeyboardEnhancementFlags::REPORT_EVENT_TYPES)
        .union(KeyboardEnhancementFlags::REPORT_ALL_KEYS_AS_ESCAPE_CODES);

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum TerminalOp {
    EnableRawMode,
    EnterAlternateScreenEnableInput,
    EnableEnhancedKeyboard,
    DisableEnhancedKeyboard,
    DisableInputAndLeaveAlternateScreen,
    DisableRawMode,
}

trait TerminalOps {
    fn run(&self, op: TerminalOp) -> Result<()>;

    fn enhanced_keyboard_supported(&self) -> bool {
        true
    }
}

#[derive(Debug, Default)]
struct CrosstermTerminalOps;

pub(crate) struct TerminalGuard {
    ops: Box<dyn TerminalOps>,
    enhanced_keyboard_enabled: bool,
}

impl TerminalOps for CrosstermTerminalOps {
    fn run(&self, op: TerminalOp) -> Result<()> {
        match op {
            TerminalOp::EnableRawMode => enable_raw_mode().map_err(Into::into),
            TerminalOp::EnterAlternateScreenEnableInput => execute!(
                io::stdout(),
                EnterAlternateScreen,
                EnableMouseCapture,
                EnableBracketedPaste,
                SetCursorStyle::SteadyBlock,
            )
            .map_err(Into::into),
            TerminalOp::EnableEnhancedKeyboard => execute!(
                io::stdout(),
                PushKeyboardEnhancementFlags(ENHANCED_KEYBOARD_FLAGS)
            )
            .map_err(Into::into),
            TerminalOp::DisableEnhancedKeyboard => {
                execute!(io::stdout(), PopKeyboardEnhancementFlags).map_err(Into::into)
            }
            TerminalOp::DisableInputAndLeaveAlternateScreen => {
                // Also runs from the panic hook, before unwinding frame guards.
                let _ = execute!(io::stdout(), EndSynchronizedUpdate);
                graphics::cleanup();
                execute!(
                    io::stdout(),
                    DisableBracketedPaste,
                    DisableMouseCapture,
                    SetCursorStyle::DefaultUserShape,
                    LeaveAlternateScreen
                )
                .map_err(Into::into)
            }
            TerminalOp::DisableRawMode => disable_raw_mode().map_err(Into::into),
        }
    }

    fn enhanced_keyboard_supported(&self) -> bool {
        !cfg!(windows)
    }
}

impl TerminalGuard {
    pub(crate) fn enter() -> Result<Self> {
        let guard = Self::enter_with_ops(Box::new(CrosstermTerminalOps))?;
        crate::output::hold_terminal_warnings();
        Ok(guard)
    }

    fn enter_with_ops(ops: Box<dyn TerminalOps>) -> Result<Self> {
        ops.run(TerminalOp::EnableRawMode)?;
        if let Err(error) = ops.run(TerminalOp::EnterAlternateScreenEnableInput) {
            let _ = ops.run(TerminalOp::DisableInputAndLeaveAlternateScreen);
            let _ = ops.run(TerminalOp::DisableRawMode);
            return Err(error);
        }
        let enhanced_keyboard_supported = ops.enhanced_keyboard_supported();
        if enhanced_keyboard_supported
            && let Err(error) = ops.run(TerminalOp::EnableEnhancedKeyboard)
        {
            let _ = ops.run(TerminalOp::DisableEnhancedKeyboard);
            let _ = ops.run(TerminalOp::DisableInputAndLeaveAlternateScreen);
            let _ = ops.run(TerminalOp::DisableRawMode);
            return Err(error);
        }
        Ok(Self {
            ops,
            enhanced_keyboard_enabled: enhanced_keyboard_supported,
        })
    }
}

pub(crate) fn restore_terminal_best_effort() {
    let ops = CrosstermTerminalOps;
    let _ = ops.run(TerminalOp::DisableEnhancedKeyboard);
    let _ = ops.run(TerminalOp::DisableInputAndLeaveAlternateScreen);
    let _ = ops.run(TerminalOp::DisableRawMode);
    crate::output::release_terminal_warnings();
}

impl Drop for TerminalGuard {
    fn drop(&mut self) {
        if self.enhanced_keyboard_enabled {
            let _ = self.ops.run(TerminalOp::DisableEnhancedKeyboard);
        }
        let _ = self
            .ops
            .run(TerminalOp::DisableInputAndLeaveAlternateScreen);
        let _ = self.ops.run(TerminalOp::DisableRawMode);
        crate::output::release_terminal_warnings();
    }
}