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|
//! In-window Command line interface. Used for operations that are just easier than with GUI.
//!
//! Sometimes it is nice to have a GUI, for instance when a selection has to be made, things have to
//! be moved etc., however for operations like saving/loading and exporting, no such thing has to be
//! done and the GUI is really just slowing you down (at least in my opinion). For these operations,
//! it is much better to simply have a command do that specific thing. It is also much easier to
//! implement a new command, so features can be tested more quickly. For some things, there should
//! still be a GUI option. With the example of saving/loading, it is much easier to find some hidden
//! folder in a GUI, so that is definitely a consideration for the future.
pub mod cmd;
pub use self::cmd::*;
use crate::colours::DEFAULT_COLOURS;
use crate::input::{Button, Input};
use crate::math::Vec2;
use crate::Editor;
use raylib::drawing::{RaylibDraw, RaylibDrawHandle};
use std::sync::mpsc::Receiver;
/// The command line interface. Should be created only once per program instance.
pub struct CLI {
text: String,
char_pipe: Option<Receiver<char>>,
}
impl CLI {
/// Create a CLI for this instance
pub fn new(input: &mut Input) -> Self {
input.add_global(Button::Text(':').into());
Self {
text: String::new(),
char_pipe: None,
}
}
/// Activates the CLI, which will now capture keyboard input and execute commands accordingly.
pub fn try_activate(&mut self, input: &mut Input) {
if !self.active() {
self.char_pipe = input.try_capture_keyboard();
if self.char_pipe.is_some() {
self.text = ":".to_owned();
}
}
}
/// Deactivate the command line.
pub fn deactivate(&mut self) {
// Hang up, the input handler will get the message.
self.char_pipe = None;
}
/// Checks if the CLI is currently active. This means input to other things should be ignored.
pub fn active(&self) -> bool {
self.char_pipe.is_some()
}
fn perform_command(&mut self, editor: &mut Editor) {
match cmd::parse_command(&self.text[1..]) {
Ok(cmd) => match cmd.process(editor) {
Ok(res) => self.text = format!("SUCCESS: {}", res),
Err(err) => self.text = format!("ERROR: {}", err),
},
Err(err) => self.text = format!("SYNTAX ERROR: {}", err),
}
}
/// Handle input for the command line and perform any commands the user may want to run.
pub fn update(&mut self, editor: &mut Editor, input: &mut Input) {
/* Check if the CLI is currently active. If not and it should not be activated according to
* keyboard input, there is nothing to do.
*/
if !self.active() {
if input.poll_global(&Button::Text(':').into()) {
self.try_activate(input);
if !self.active() {
return;
}
} else {
return;
}
}
let rx = self
.char_pipe
.as_mut()
.expect("No character pipe eventhough CLI should be active");
if let Ok(c) = rx.try_recv() {
match c {
'\x1B' => self.text.clear(), // Escape
'\x7f' => {
self.text.pop();
} // Backspace
'\n' => {
self.perform_command(editor);
self.deactivate();
}
c => self.text.push(c),
}
}
// When the text is empty, there is also no command marker, so set as inactive and leave.
if self.text.is_empty() {
self.deactivate()
}
}
/// Draw the command line at the bottom of the window.
pub fn draw(&self, rld: &mut RaylibDrawHandle) {
let pos = Vec2::new(150., rld.get_screen_height() as f32 - 25.);
rld.draw_rectangle_v(
pos,
Vec2::new(rld.get_screen_width() as f32 - pos.x, 25.),
DEFAULT_COLOURS.cli_background,
);
rld.draw_text(
&self.text,
155,
rld.get_screen_height() - 22,
20,
DEFAULT_COLOURS.cli_foreground,
);
}
}
|
