lib-nested/shell/src/process.rs

use {
    std::{
        sync::Arc,
        process::Command,
        os::unix::io::{FromRawFd, AsRawFd},
    },
    std::sync::RwLock,
    termion::event::{Key, Event},
    cgmath::Point2,
    nested::{
        core::{ViewPort, OuterViewPort, InnerViewPort, Observer},
        singleton::{SingletonView, SingletonBuffer},
        sequence::{SequenceView, SequenceViewExt},
        index::buffer::IndexBuffer,
        vec::VecBuffer,
        terminal::{TerminalAtom, TerminalStyle, TerminalView, TerminalEvent, TerminalEditor, TerminalEditorResult, make_label},
        tree_nav::{TreeNav, TreeNavResult, TerminalTreeEditor, TreeCursor},
        list::{ListEditor, ListEditorStyle, sexpr::ListDecoration},
        string_editor::CharEditor,
    }
};

//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>

pub struct ProcessArg {
    editor: ListEditor< CharEditor,
                        Box<dyn Fn() -> Arc<RwLock<CharEditor>> + Send + Sync + 'static> >
}

impl ProcessArg {
    pub fn get_data_port(&self) -> OuterViewPort<dyn SequenceView<Item = char>> {
        self.editor.get_data_port()
            .map(
                |char_editor| char_editor.read().unwrap().get_data_port().get_view().unwrap().get().unwrap()
            )
    }
}

impl TerminalEditor for ProcessArg {
    fn get_term_view(&self) -> OuterViewPort<dyn TerminalView> {
        self.editor
            .get_seg_seq_view()
            .to_grid_horizontal()
            .flatten()
    }

    fn handle_terminal_event(&mut self, event: &TerminalEvent) -> TerminalEditorResult {
        match event {
            TerminalEvent::Input(Event::Key(Key::Char(' '))) |
            TerminalEvent::Input(Event::Key(Key::Char('\n'))) => {
                self.editor.up();
                TerminalEditorResult::Exit
            }

            event => self.editor.handle_terminal_event(event)
        }
    }
}

impl TreeNav for ProcessArg {
    fn get_cursor(&self) -> TreeCursor { self.editor.get_cursor() }
    fn goto(&mut self, cur: TreeCursor) -> TreeNavResult  { self.editor.goto(cur) }
    fn goto_home(&mut self) -> TreeNavResult  { self.editor.goto_home() }
    fn goto_end(&mut self) -> TreeNavResult  { self.editor.goto_end() }
    fn pxev(&mut self) -> TreeNavResult  { self.editor.pxev() }
    fn nexd(&mut self) -> TreeNavResult  { self.editor.nexd() }
    fn up(&mut self) -> TreeNavResult { self.editor.up() }
    fn dn(&mut self) -> TreeNavResult { self.editor.dn() }
}

pub struct ProcessLauncher {
    cmd_editor: ListEditor<
            ProcessArg, Box<dyn Fn() -> Arc<RwLock<ProcessArg>> + Send + Sync + 'static>
        >,
    pty: Option<crate::pty::PTY>,
    ptybox: Arc<RwLock<crate::ascii_box::AsciiBox>>,

    pty_port: ViewPort<dyn TerminalView>,
    
    comp_port: ViewPort<dyn TerminalView>,
    compositor: Arc<RwLock<nested::terminal::TerminalCompositor>>
}

impl ProcessLauncher {
    pub fn new() -> Self {
        let pty_port = ViewPort::new();
        let comp_port = ViewPort::new();
        let box_port = ViewPort::<dyn TerminalView>::new();
        let compositor = nested::terminal::TerminalCompositor::new(comp_port.inner());

        let cmd_editor = ListEditor::new(
                Box::new(
                    || {
                        Arc::new(RwLock::new(ProcessArg {
                        editor: ListEditor::new(
                            Box::new(
                                || {
                                    Arc::new(RwLock::new(CharEditor::new()))
                                }
                            ),
                            ListEditorStyle::Plain)
                        }))
                    }
                ) as Box::<dyn Fn() -> Arc<RwLock<ProcessArg>> + Send + Sync>,
                ListEditorStyle::Plain
        );

        compositor.write().unwrap().push(
            box_port.outer()
                .map_item(|_idx, x| x.add_style_back(TerminalStyle::fg_color((90, 120, 100))))
        );
        compositor.write().unwrap().push(
            cmd_editor
                .get_seg_seq_view()
                .decorate("$(", ")", " ", 0)
                .to_grid_horizontal()
                .flatten()
        );

        ProcessLauncher {
            cmd_editor,
            pty: None,
            ptybox: crate::ascii_box::AsciiBox::new(
                    cgmath::Vector2::new(80, 25),
                    pty_port.outer()
                        .map_item(|_,a:&TerminalAtom| a.add_style_back(TerminalStyle::fg_color((230, 230, 230)))),
                    box_port.inner()
                ),
            pty_port,
            comp_port,
            compositor
        }
    }

    pub fn launch_pty2(&mut self) {
        self.launch_pty(self.pty_port.inner());
    }

    pub fn launch_pty(&mut self, port: InnerViewPort<dyn TerminalView>) -> Option<crate::pty::PTY> {
        self.up();
        self.up();

        let mut strings = Vec::new();

        let v = self.cmd_editor.get_data_port().get_view().unwrap();
        for i in 0 .. v.len().unwrap_or(0) {
            let arg_view = v.get(&i).unwrap().read().unwrap().get_data_port().get_view().unwrap();
            strings.push(arg_view.iter().collect::<String>());
        }

        if strings.len() > 0 {
            // Spawn a shell into the pty
            let mut cmd = crate::pty::CommandBuilder::new(strings[0].as_str());
            cmd.args(&strings[1..]);

            crate::pty::PTY::new(cmd, port)
        } else {
            None
        }
    }
}

impl TerminalEditor for ProcessLauncher {
    fn get_term_view(&self) -> OuterViewPort<dyn TerminalView> {
        self.comp_port.outer()
    }

    fn handle_terminal_event(&mut self, event: &TerminalEvent) -> TerminalEditorResult {
        match event {
            TerminalEvent::Input(Event::Key(Key::Char('\n'))) => {
                // launch command
                self.cmd_editor.up();
                self.cmd_editor.up();
                TerminalEditorResult::Exit
            }

            event => self.cmd_editor.handle_terminal_event(event)
        }
    }    
}

impl TreeNav for ProcessLauncher {
    fn get_cursor(&self) -> TreeCursor { self.cmd_editor.get_cursor() }
    fn goto(&mut self, cur: TreeCursor) -> TreeNavResult  { self.cmd_editor.goto(cur) }
    fn goto_home(&mut self) -> TreeNavResult  { self.cmd_editor.goto_home() }
    fn goto_end(&mut self) -> TreeNavResult  { self.cmd_editor.goto_end() }
    fn pxev(&mut self) -> TreeNavResult  { self.cmd_editor.pxev() }
    fn nexd(&mut self) -> TreeNavResult  { self.cmd_editor.nexd() }
    fn up(&mut self) -> TreeNavResult { self.cmd_editor.up() }
    fn dn(&mut self) -> TreeNavResult { self.cmd_editor.dn() }
}