display.rs

// display.rs

extern crate termion;

use termion::color;

use std::io::stdout;
use std::io::Write;

use crate::DisplayableFile;

impl DisplayableFile {
    pub fn display(&mut self) {
        write!(stdout(), "{}", termion::clear::All).unwrap();

        let li = self.cursor_pos.y as i32;
        let ts = self.terminal_size.y as i32;
        let mut start_line = li - ts;
        if start_line < 0 {  start_line = 0; }
        if start_line > (self.contents.len() as  i32) { start_line = self.contents.len() as  i32; }

        // Display contents
        let max_length = self.contents.len() + self.terminal_size.y;

        let mut count_line = 0;

        for line_index in 0..max_length {
            let mut display = false;


            if line_index >= start_line as usize {
                display = true;
            }
            if count_line > ts-2 {
                display = false;
            }

            if display {
                count_line += 1;
                writeln!(
                    stdout(),
                    "{}{}{}{:05}{}{}{}{}{}",
                    termion::cursor::Goto(1, (&count_line + 1).try_into().unwrap()),
                    color::Fg(color::LightBlue),
                    color::Bg(color::White),
                    line_index+1,
                    color::Fg(color::Reset),
                    color::Bg(color::Reset),
                    color::Fg(color::Yellow),
                    self.contents.get(line_index).unwrap_or(&String::from("")),
                    color::Fg(color::Reset)
                    ).unwrap();
                if line_index == self.cursor_pos.y {
                    write!(
                        stdout(),
                        "{}{}|{}{}",
                        termion::cursor::Goto((self.cursor_pos.x + 6) as u16, (count_line+1) as u16),
                        color::Fg(color::Blue),
                        termion::cursor::Goto((self.cursor_pos.x + 7) as u16, (count_line+1) as u16),
                        color::Fg(color::Yellow),
                    ).unwrap();
                }
    }
}

        //  Display footer
        self.update_footer(String::from(self.mode.as_str()));

        write!(
            stdout(),
            "{}",
            termion::cursor::Goto(1, (self.terminal_size.y - 1).try_into().unwrap())
        )
        .unwrap();

        writeln!(
            stdout(),
            "{}{}{}{}{}{}",
            color::Fg(color::Black),
            color::Bg(color::White),
            self.footer,
            color::Fg(color::Reset),
            color::Bg(color::Reset),
            termion::cursor::Goto(1, 1)
        )
        .unwrap();

    }
}