fn editor_read_key(handle: &mut Read) -> Keypress {

        // read a single byte from handle
        fn read1(handle: &mut Read) -> Option<u8> {
            let mut buffer: [u8; 1] = [0];
            match handle.take(1).read(&mut buffer) {
                Ok(1) => Some(buffer[0]),
                Ok(0) => None,
                Ok(_) | Err(_) => panic!("error"),
            }
        }

        // with raw mode we set a read timeout, so the read doesn't block waiting for data
        let c;
        loop {
            match read1(handle) {
                Some(x) => {
                    c = x;
                    break;
                }
                None => continue,
            }
        }
        if c == b'\x1b' {
            if let (Some(c1), Some(c2)) = (read1(handle), read1(handle)) {
                match (c1, c2) {
                    (b'[', b'0'...b'9') => {
                        if let Some(c3) = read1(handle) {
                            match (c3, c2) {
                                (b'~', b'1') | (b'~', b'7') => return Keypress::Home,
                                (b'~', b'4') | (b'~', b'8') => return Keypress::End,
                                (b'~', b'3') => return Keypress::Del,
                                (b'~', b'5') => return Keypress::Page(Arrow::Up),
                                (b'~', b'6') => return Keypress::Page(Arrow::Down),
                                (_, _) => (),
                            }
                        }
                    }
                    (b'[', b'A') => return Keypress::Ar(Arrow::Up),
                    (b'[', b'B') => return Keypress::Ar(Arrow::Down),
                    (b'[', b'C') => return Keypress::Ar(Arrow::Right),
                    (b'[', b'D') => return Keypress::Ar(Arrow::Left),
                    (b'[', b'H') | (b'O', b'H') => return Keypress::Home,
                    (b'[', b'F') | (b'O', b'F') => return Keypress::End,
                    _ => (),
                }
            }
            return Keypress::Esc;
        }
        match c {
            127 => Keypress::Backspace,
            b'\r' => Keypress::Enter,
            CTRLH => Keypress::CtrlH,
            QUIT => Keypress::Quit,
            SAVE => Keypress::Save,
            FIND => Keypress::Find,
            _ => Keypress::Chr(c as char),
        }
    }
/// Grab the next keypress from `handle`
///
/// Polls handle until a keypress is available. If it is
/// a recognized escape sequence, we return the appropriate keypress
/// othewise we just return the character `Keypress::Chr()`
Grab the next keypress from `handle`
Polls handle until a keypress is available. If it is
a recognized escape sequence, we return the appropriate keypress
othewise we just return the character `Keypress::Chr()`
Grab the next keypress from ` handle ` Polls handle until a keypress is available . If it is a recognized escape sequence we return the appropriate keypress othewise we just return the character ` Keypress :: Chr () `
fn editor_read_key(handle: &mut Read) -> Keypress {
        // read a single byte from handle
        fn read1(handle: &mut Read) -> Option<u8> {
            let mut buffer: [u8; 1] = [0];
            match handle.take(1).read(&mut buffer) {
                Ok(1) => Some(buffer[0]),
                Ok(0) => None,
                Ok(_) | Err(_) => panic!("error"),
            }
        }
        // with raw mode we set a read timeout, so the read doesn't block waiting for data
        let c;
        loop {
            match read1(handle) {
                Some(x) => {
                    c = x;
                    break;
                }
                None => continue,
            }
        }
        if c == b'\x1b' {
            if let (Some(c1), Some(c2)) = (read1(handle), read1(handle)) {
                match (c1, c2) {
                    (b'[', b'0'...b'9') => {
                        if let Some(c3) = read1(handle) {
                            match (c3, c2) {
                                (b'~', b'1') | (b'~', b'7') => return Keypress::Home,
                                (b'~', b'4') | (b'~', b'8') => return Keypress::End,
                                (b'~', b'3') => return Keypress::Del,
                                (b'~', b'5') => return Keypress::Page(Arrow::Up),
                                (b'~', b'6') => return Keypress::Page(Arrow::Down),
                                (_, _) => (),
                            }
                        }
                    }
                    (b'[', b'A') => return Keypress::Ar(Arrow::Up),
                    (b'[', b'B') => return Keypress::Ar(Arrow::Down),
                    (b'[', b'C') => return Keypress::Ar(Arrow::Right),
                    (b'[', b'D') => return Keypress::Ar(Arrow::Left),
                    (b'[', b'H') | (b'O', b'H') => return Keypress::Home,
                    (b'[', b'F') | (b'O', b'F') => return Keypress::End,
                    _ => (),
                }
            }
            return Keypress::Esc;
        }
        match c {
            127 => Keypress::Backspace,
            b'\r' => Keypress::Enter,
            CTRLH => Keypress::CtrlH,
            QUIT => Keypress::Quit,
            SAVE => Keypress::Save,
            FIND => Keypress::Find,
            _ => Keypress::Chr(c as char),
        }
    }
fn editor_read_key ( handle : & mut Read ) -> Keypress { // read a single byte from handle fn read1 ( handle : & mut Read ) -> Option < u8 > { let mut buffer : [ u8 ; 1 ] = [ 0 ] ; match handle . take ( 1 ) . read ( & mut buffer ) { Ok ( 1 ) => Some ( buffer [ 0 ] ) , Ok ( 0 ) => None , Ok ( _ ) | Err ( _ ) => panic ! ( " " ) , } } // with raw mode we set a read timeout, so the read doesn't block waiting for data let c ; loop { match read1 ( handle ) { Some ( x ) => { c = x ; break ; } None => continue , } } if c == b'\x1b' { if let ( Some ( c1 ) , Some ( c2 ) ) = ( read1 ( handle ) , read1 ( handle ) ) { match ( c1 , c2 ) { ( b'[' , b'0' ... b'9' ) => { if let Some ( c3 ) = read1 ( handle ) { match ( c3 , c2 ) { ( b'~' , b'1' ) | ( b'~' , b'7' ) => return Keypress :: Home , ( b'~' , b'4' ) | ( b'~' , b'8' ) => return Keypress :: End , ( b'~' , b'3' ) => return Keypress :: Del , ( b'~' , b'5' ) => return Keypress :: Page ( Arrow :: Up ) , ( b'~' , b'6' ) => return Keypress :: Page ( Arrow :: Down ) , ( _ , _ ) => ( ) , } } } ( b'[' , b'A' ) => return Keypress :: Ar ( Arrow :: Up ) , ( b'[' , b'B' ) => return Keypress :: Ar ( Arrow :: Down ) , ( b'[' , b'C' ) => return Keypress :: Ar ( Arrow :: Right ) , ( b'[' , b'D' ) => return Keypress :: Ar ( Arrow :: Left ) , ( b'[' , b'H' ) | ( b'O' , b'H' ) => return Keypress :: Home , ( b'[' , b'F' ) | ( b'O' , b'F' ) => return Keypress :: End , _ => ( ) , } } return Keypress :: Esc ; } match c { 127 => Keypress :: Backspace , b'\r' => Keypress :: Enter , CTRLH => Keypress :: CtrlH , QUIT => Keypress :: Quit , SAVE => Keypress :: Save , FIND => Keypress :: Find , _ => Keypress :: Chr ( c as char ) , } }
Grab the next keypress from `handle`
Polls handle until a keypress is available.
Grab the next keypress from ` handle ` Polls handle until a keypress is available .
handle
&mut Read