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use crate::string::{self, to_byte_offset};
use crate::Config;
use crate::TermBuffer;
use crossterm::{self as ct, InputEvent, KeyEvent};
#[derive(Debug)]
pub struct MessagePrompt<'a> {
config: &'a mut Config,
input: Vec<String>,
cursor: (u16, u16),
}
pub enum MessagePromptResult {
Message(String),
Escape,
Terminate,
}
impl<'a> MessagePrompt<'a> {
pub fn new(config: &'a mut Config) -> Self {
MessagePrompt {
config,
input: vec![String::new()],
cursor: (0, 0),
}
}
pub fn run(mut self) -> MessagePromptResult {
let mut buffer = TermBuffer::new();
let input = crossterm::input();
let mut sync_stdin = input.read_sync();
let mut first_iteration = true;
loop {
let event = if first_iteration {
first_iteration = false;
None
} else {
sync_stdin.next()
};
match event {
Some(InputEvent::Keyboard(KeyEvent::Ctrl('c'))) => {
return MessagePromptResult::Terminate;
}
Some(InputEvent::Keyboard(KeyEvent::Ctrl('a'))) => {
self.cursor.0 = 0;
}
Some(InputEvent::Keyboard(KeyEvent::Ctrl('e'))) => {
let (_, y) = self.cursor;
let line = self
.input
.get(y as usize)
.expect("ctrl-e unable to find current line");
self.cursor.0 = string::len(&line) as u16;
}
Some(InputEvent::Keyboard(KeyEvent::Alt('\n')))
| Some(InputEvent::Keyboard(KeyEvent::Ctrl('\n'))) => {
self.input.push(String::new());
self.cursor.1 += 1;
}
Some(InputEvent::Keyboard(KeyEvent::Char('\n'))) => {
return MessagePromptResult::Message(self.input.join("\n"));
}
Some(InputEvent::Keyboard(KeyEvent::Char(c))) => {
let (x, y) = self.cursor;
let line = self.input.get_mut(y as usize).unwrap();
line.insert(to_byte_offset(&line, x as usize), c);
self.cursor.0 += 1;
}
Some(InputEvent::Keyboard(KeyEvent::Left)) => {
self.cursor.0 = self.cursor.0.saturating_sub(1);
}
Some(InputEvent::Keyboard(KeyEvent::Right)) => {
let (x, y) = self.cursor;
let line = self.input.get_mut(y as usize).expect("KE::Right get_mut");
if line.len() < x as usize + 1 {
line.push(' ');
}
self.cursor.0 += 1;
}
Some(InputEvent::Keyboard(KeyEvent::Up)) => {
self.cursor.1 = self.cursor.1.saturating_sub(1);
}
Some(InputEvent::Keyboard(KeyEvent::Down)) => {
let (_, y) = self.cursor;
if (y as usize) + 1 >= self.input.len() {
self.input.push(String::new());
}
self.cursor = (0, y + 1);
}
Some(InputEvent::Keyboard(KeyEvent::Backspace)) => match self.cursor {
(0, 0) => {}
(0, y) => {
self.input.remove(y as usize);
self.cursor.1 -= 1;
let line = &self.input[self.cursor.1 as usize];
self.cursor.0 = string::len(line) as u16;
}
(x, y) => {
let line = self
.input
.get_mut(y as usize)
.expect("Backspace (x, y) get line y");
if x as usize >= string::len(line) {
line.pop();
} else {
line.remove(to_byte_offset(&line, x as usize) - 1);
}
self.cursor.0 -= 1;
}
},
Some(InputEvent::Keyboard(KeyEvent::Esc)) => {
return MessagePromptResult::Escape;
}
_ => {}
};
let (x, y) = self.cursor;
let instructions = "Commit message (arrow keys for multiple lines):";
let divider = "-".repeat(instructions.len());
buffer.push_line(instructions);
buffer.push_line(divider);
let editor_y = 2;
for (i, line) in self.input.iter().enumerate() {
if i == 0 && line.len() > 50 {
let (good, bad) = crate::string::split_at(&line, 50);
buffer.push_line(format!(
"{}{}{}",
good,
ct::style(bad).with(ct::Color::Red),
crate::color::reset_display(),
));
} else {
buffer.push_line(line.to_string());
}
}
buffer.set_next_cursor((x, y + editor_y));
buffer.render_frame();
buffer.flush();
}
}
}