commit 0b9f43b9d2c65373fc91fc8917ec46a6769edef8
Author: emilis <emilis@puff.place>
Date:   Tue Jan 10 01:30:21 2023 +0000

    some initial work experimenting with screens

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..5454679
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "kk"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.68"
+misskey = "0.2.0"
+termion = "2.0.1"
+
+[dependencies.tokio]
+version = "1.24.1"
+features = ["full"]
diff --git a/src/display/body.rs b/src/display/body.rs
new file mode 100644
index 0000000..15fd780
--- /dev/null
+++ b/src/display/body.rs
@@ -0,0 +1,113 @@
+use std::io::{Stdout, Write};
+
+use termion::{clear, cursor, raw::RawTerminal};
+
+use super::{
+    frame::{self, FrameDef},
+    theme::Theme,
+    Event, Page,
+};
+
+type Result<T> = std::result::Result<T, anyhow::Error>;
+
+#[derive(Debug, Clone)]
+pub enum Body {
+    Echo,
+    Signin(SigninPage),
+}
+
+impl Body {
+    fn echo(theme: Theme, screen: &mut RawTerminal<Stdout>, event: Event) -> Result<()> {
+        let event = format!("{}", event);
+        write!(
+            screen,
+            "{theme}{clear}{start}Event: {}",
+            event,
+            theme = theme.display_string(),
+            clear = clear::All,
+            start = cursor::Goto(1, 1)
+        )?;
+        screen.flush()?;
+        Ok(())
+    }
+}
+
+impl Page for Body {
+    fn receive_event(
+        &mut self,
+        theme: Theme,
+        screen: &mut RawTerminal<Stdout>,
+        event: Event,
+    ) -> Result<()> {
+        match self {
+            Body::Signin(b) => b.receive_event(theme, screen, event)?,
+            Body::Echo => Body::echo(theme, screen, event)?,
+        };
+        Ok(())
+    }
+
+    fn init(&self, theme: Theme, screen: &mut RawTerminal<Stdout>) -> Result<()> {
+        write!(
+            screen,
+            "{theme}{cursor}{clear}{fr}",
+            fr = frame::draw_frame(theme, FrameDef::ByPercent(90, 90)),
+            theme = theme.display_string(),
+            cursor = cursor::Goto(1, 1),
+            clear = clear::All
+        )?;
+        screen.flush()?;
+        Ok(())
+    }
+}
+
+#[derive(Debug, Clone, Default)]
+struct SigninPage {
+    hostname: String,
+    username: String,
+    cursor: SigninCursorLocation,
+}
+
+#[derive(Debug, Clone)]
+enum SigninCursorLocation {
+    Hostname,
+    Username,
+    Next,
+}
+
+impl Default for SigninCursorLocation {
+    fn default() -> Self {
+        Self::Hostname
+    }
+}
+
+impl SigninPage {
+    fn frame_string() -> String {
+        format!("")
+    }
+}
+
+impl Page for SigninPage {
+    fn receive_event(
+        &mut self,
+        theme: Theme,
+        screen: &mut RawTerminal<Stdout>,
+        event: Event,
+    ) -> Result<()> {
+        Ok(())
+    }
+
+    fn init(&self, theme: Theme, screen: &mut RawTerminal<Stdout>) -> Result<()> {
+        let fr = frame::draw_frame(theme, FrameDef::ByPercent(40, 40));
+        write!(
+            screen,
+            "{theme}{clear}{hide_cursor}{frame}",
+            frame = fr,
+            theme = theme.display_string(),
+            clear = clear::All,
+            hide_cursor = cursor::Hide,
+        )?;
+        screen.flush()?;
+
+        Ok(())
+    }
+}
diff --git a/src/display/frame.rs b/src/display/frame.rs
new file mode 100644
index 0000000..e260ae4
--- /dev/null
+++ b/src/display/frame.rs
@@ -0,0 +1,102 @@
+use std::{io, process};
+
+use termion::{color, cursor, screen::IntoAlternateScreen};
+
+use super::theme::Theme;
+const ESTIMATED_FRAME_BIT_SIZE: usize = 11;
+
+pub enum FrameDef {
+    ByAbsolute(u16, u16),
+    ByPercent(u16, u16),
+}
+
+struct Frame {
+    start: (u16, u16),
+    end: (u16, u16),
+}
+
+impl Frame {
+    fn from_bottom_right(pos: (u16, u16), term: (u16, u16)) -> Self {
+        Self {
+            start: (term.0 - pos.0, term.1 - pos.1),
+            end: pos,
+        }
+    }
+
+    fn frame_str(&self, frame_char: char) -> String {
+        let (w_len, h_len) = (
+            (self.end.0 - self.start.0) as usize,
+            (self.end.1 - self.start.1 - 1) as usize,
+        );
+        let width_str = frame_char.to_string().repeat(w_len + 1);
+        let mut frame = String::with_capacity((h_len * 2) + (w_len * 2) * ESTIMATED_FRAME_BIT_SIZE);
+        let make_line =
+            |y: u16| format!("{left}{}", width_str, left = cursor::Goto(self.start.0, y));
+        frame.push_str(&make_line(self.start.1));
+        for y in self.start.1 + 1..self.end.1 {
+            frame.push_str(&format!(
+                "{left}{char}{right}{char}",
+                left = cursor::Goto(self.start.0, y),
+                right = cursor::Goto(self.end.0, y),
+                char = frame_char,
+            ));
+        }
+        frame.push_str(&make_line(self.end.1));
+        frame
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::Frame;
+
+    #[test]
+    fn test_idk() {
+        let x = Frame::from_bottom_right((16, 16), (32, 32)).frame_str('=');
+        println!("starting");
+        println!("{}", x);
+        println!("ending");
+        assert!(false)
+    }
+}
+
+impl FrameDef {
+    fn abs_size(&self) -> Frame {
+        let (term_height, term_width) =
+            termion::terminal_size().expect("could not get terminal size");
+        let pos = match self {
+            FrameDef::ByAbsolute(h, w) => {
+                let (mut h, mut w) = (*h, *w);
+                if h > term_height {
+                    h = term_height;
+                }
+                if w > term_width {
+                    w = term_width;
+                }
+                (h, w)
+            }
+            FrameDef::ByPercent(h, w) => {
+                // term_height = 100%
+                // x           = h%
+                // x = term_height * h / 100
+                let (h, w) = (
+                    if *h > 100 { 100 } else { *h },
+                    if *w > 100 { 100 } else { *w },
+                );
+                // (h * 100 / term_height, w * 100 / term_width)
+                (term_height * h / 100, term_width * w / 100)
+            }
+        };
+        Frame::from_bottom_right(pos, (term_height, term_width))
+    }
+}
+
+pub fn draw_frame(theme: Theme, frame_size: FrameDef) -> String {
+    let frame_specs = frame_size.abs_size();
+    format!(
+        "{fg}{bg}{frame}",
+        fg = theme.colors.frame_fg.fg_string(),
+        bg = theme.colors.frame_bg.bg_string(),
+        frame = frame_specs.frame_str('='),
+    )
+}
diff --git a/src/display/mod.rs b/src/display/mod.rs
new file mode 100644
index 0000000..0f3ace5
--- /dev/null
+++ b/src/display/mod.rs
@@ -0,0 +1,112 @@
+use std::fmt::Display;
+use std::io::{self, Stdout, Write};
+use termion::event::Key;
+use termion::input::TermRead;
+use termion::raw::{IntoRawMode, RawTerminal};
+use termion::{clear, cursor};
+use tokio::sync::mpsc::{self, Receiver, Sender};
+use tokio::sync::Mutex;
+use tokio::time::Instant;
+
+use self::body::Body;
+use self::theme::Theme;
+
+pub mod body;
+pub mod frame;
+pub mod theme;
+type Result<T> = std::result::Result<T, anyhow::Error>;
+
+pub struct Screen {
+    screen: Mutex<RawTerminal<Stdout>>,
+    events_ch: Receiver<Event>,
+    body: Body,
+    last_interrupt: Option<Instant>,
+    theme: Theme,
+}
+
+#[derive(Debug)]
+pub enum Event {
+    Key(Key),
+    Interrupt,
+}
+
+impl Display for Event {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Event::Key(key) => write!(f, "{}", format!("{:#?}", key).replace('\n', "\r\n")),
+            Event::Interrupt => write!(f, "Interrupt"),
+        }
+    }
+}
+
+impl From<Key> for Event {
+    fn from(value: Key) -> Self {
+        Event::Key(value)
+    }
+}
+
+pub trait Page {
+    fn init(&self, theme: Theme, screen: &mut RawTerminal<Stdout>) -> Result<()>;
+    fn receive_event(
+        &mut self,
+        theme: Theme,
+        screen: &mut RawTerminal<Stdout>,
+        event: Event,
+    ) -> Result<()>;
+}
+
+impl Screen {
+    pub fn new(theme: Theme) -> Result<Self> {
+        let screen = Mutex::new(io::stdout().into_raw_mode()?);
+        let (send, recv) = mpsc::channel::<Event>(16);
+        tokio::spawn(async { Screen::input_loop(send).await });
+        // let body = Body::Signin(SigninPage::default());
+        let body = Body::Echo;
+        Ok(Self {
+            screen,
+            body,
+            theme,
+            events_ch: recv,
+            last_interrupt: None,
+        })
+    }
+
+    pub async fn start(mut self) -> Result<()> {
+        {
+            let mut scr = self.screen.lock().await;
+            self.body.init(self.theme, &mut scr)?;
+        }
+
+        while let Some(ev) = self.events_ch.recv().await {
+            let mut scr = self.screen.lock().await;
+            if let Event::Interrupt = ev {
+                if let Some(last) = self.last_interrupt && last.elapsed().as_millis() < 500 {
+                    self.events_ch.close();
+                    break;
+                }
+                self.last_interrupt = Some(Instant::now());
+            }
+            self.body.receive_event(self.theme, &mut scr, ev)?;
+        }
+
+        // Cleanup
+        let mut scr = self.screen.lock().await;
+        write!(scr, "{}{}", cursor::Goto(1, 1), clear::All)?;
+
+        Ok(())
+    }
+
+    async fn input_loop(snd: Sender<Event>) {
+        let input = io::stdin();
+        for key in input.keys() {
+            let event = match key.unwrap() {
+                Key::Ctrl(sub) => match sub {
+                    'c' => Event::Interrupt,
+                    key => Event::Key(Key::Ctrl(key)),
+                },
+                key => key.into(),
+            };
+            snd.send(event).await.unwrap();
+        }
+    }
+}
diff --git a/src/display/theme.rs b/src/display/theme.rs
new file mode 100644
index 0000000..5abab8f
--- /dev/null
+++ b/src/display/theme.rs
@@ -0,0 +1,76 @@
+use std::ops::Deref;
+
+use termion::color;
+
+#[derive(Clone, Copy, Debug)]
+pub struct Theme {
+    pub colors: Colors,
+}
+
+#[derive(Clone, Copy, Debug)]
+pub struct Colors {
+    pub primary_bg: Color,
+    pub frame_bg: Color,
+    pub frame_fg: Color,
+    pub text: Color,
+}
+impl Theme {}
+
+#[derive(Clone, Copy, Debug)]
+pub struct Color(color::Rgb);
+impl Deref for Color {
+    type Target = color::Rgb;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl TryFrom<String> for Color {
+    type Error = anyhow::Error;
+
+    fn try_from(value: String) -> Result<Self, Self::Error> {
+        Ok(value.as_str().try_into()?)
+    }
+}
+
+impl TryFrom<&str> for Color {
+    type Error = anyhow::Error;
+
+    fn try_from(value: &str) -> Result<Self, Self::Error> {
+        if value.len() < 6 || value.len() > 7 {
+            return Err(anyhow::anyhow!("hex code length invalid: {}", value.len()));
+        }
+        let mut i = 0;
+        if value.starts_with('#') {
+            i = 1;
+        }
+        Ok(Self(color::Rgb(
+            u8::from_str_radix(&value[i..i + 2], 16)?,
+            u8::from_str_radix(&value[i + 2..i + 4], 16)?,
+            u8::from_str_radix(&value[i + 4..i + 6], 16)?,
+        )))
+    }
+}
+
+impl Default for Theme {
+    fn default() -> Self {
+        Self {
+            colors: Colors {
+                primary_bg: "#3b224c".try_into().unwrap(),
+                text: "#ffe6ff".try_into().unwrap(),
+                frame_bg: "#330033".try_into().unwrap(),
+                frame_fg: "#ffe6ff".try_into().unwrap(),
+            },
+        }
+    }
+}
+
+impl Theme {
+    pub fn display_string(&self) -> String {
+        format!(
+            "{primary_bg}{text}",
+            primary_bg = self.colors.primary_bg.bg_string(),
+            text = self.colors.text.fg_string()
+        )
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..170fd31
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,19 @@
+#![feature(let_chains)]
+use std::process;
+
+use display::theme::Theme;
+
+use crate::display::Screen;
+
+extern crate termion;
+mod display;
+
+#[tokio::main]
+async fn main() -> Result<(), anyhow::Error> {
+    {
+        let theme = Theme::default();
+        let x = Screen::new(theme).unwrap();
+        x.start().await?;
+    }
+    process::exit(0);
+}