1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
use crate::{keymap, Args};
use anyhow::Error;
use crossterm::{
cursor,
cursor::position,
event::{self, read, Event, EventStream, KeyCode, KeyEvent},
execute, queue,
style::{Color, Print, SetForegroundColor},
terminal::{self, disable_raw_mode, enable_raw_mode},
};
use futures::{future::FutureExt, select, StreamExt};
use helix_core::{state::coords_at_pos, state::Mode, Buffer, State};
use std::io::{self, stdout, Write};
use std::path::PathBuf;
use std::time::Duration;
static EX: smol::Executor = smol::Executor::new();
pub struct Editor {
state: Option<State>,
first_line: u16,
size: (u16, u16),
}
impl Editor {
pub fn new(mut args: Args) -> Result<Self, Error> {
let mut editor = Editor {
state: None,
first_line: 0,
size: terminal::size().unwrap(),
};
if let Some(file) = args.files.pop() {
editor.open(file)?;
}
Ok(editor)
}
pub fn open(&mut self, path: PathBuf) -> Result<(), Error> {
let buffer = Buffer::load(path)?;
let state = State::new(buffer);
self.state = Some(state);
Ok(())
}
fn render(&mut self) {
match &self.state {
Some(state) => {
let lines = state
.contents()
.lines_at(self.first_line as usize)
.take(self.size.1 as usize)
.map(|x| x.as_str().unwrap());
let mut stdout = stdout();
for (n, line) in lines.enumerate() {
execute!(
stdout,
SetForegroundColor(Color::DarkCyan),
cursor::MoveTo(0, n as u16),
Print((n + 1).to_string())
);
execute!(
stdout,
SetForegroundColor(Color::Reset),
cursor::MoveTo(2, n as u16),
Print(line)
);
}
let mode = match state.mode {
Mode::Insert => "INS",
Mode::Normal => "NOR",
};
execute!(
stdout,
SetForegroundColor(Color::Reset),
cursor::MoveTo(0, self.size.1),
Print(mode)
);
// set cursor shape
match state.mode {
Mode::Insert => write!(stdout, "\x1B[6 q"),
Mode::Normal => write!(stdout, "\x1B[2 q"),
};
// render the cursor
let pos = state.selection.primary().head;
let coords = coords_at_pos(&state.doc.contents.slice(..), pos);
execute!(
stdout,
cursor::MoveTo((coords.1 + 2) as u16, coords.0 as u16)
);
}
None => (),
}
}
pub async fn print_events(&mut self) {
let mut reader = EventStream::new();
let keymap = keymap::default();
self.render();
loop {
// Handle key events
let mut event = reader.next().await;
match event {
// TODO: handle resize events
Some(Ok(Event::Key(KeyEvent {
code: KeyCode::Char('q'),
..
}))) => {
break;
}
Some(Ok(Event::Key(event))) => {
if let Some(state) = &mut self.state {
match state.mode {
Mode::Insert => {
match event {
KeyEvent {
code: KeyCode::Esc, ..
} => helix_core::commands::normal_mode(state, 1),
KeyEvent {
code: KeyCode::Char(c),
..
} => helix_core::commands::insert(state, c),
_ => (), // skip
}
self.render();
}
Mode::Normal => {
// TODO: handle modes and sequences (`gg`)
if let Some(command) = keymap.get(&event) {
// TODO: handle count other than 1
command(state, 1);
self.render();
}
}
}
}
}
Some(Ok(_)) => {
// unhandled event
}
Some(Err(x)) => panic!(x),
None => break,
}
}
}
pub async fn run(&mut self) -> Result<(), Error> {
enable_raw_mode()?;
let mut stdout = stdout();
execute!(stdout, terminal::EnterAlternateScreen)?;
self.print_events().await;
// reset cursor shape
write!(stdout, "\x1B[2 q");
execute!(stdout, terminal::LeaveAlternateScreen)?;
disable_raw_mode()?;
Ok(())
}
}
|
