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use std::path::PathBuf;
use std::sync::{Mutex, Arc};
use input::Input;
use keyboard::Key;
use view::View;
use frontends::{Frontend, EditorEvent};
use modes::{Mode, ModeType, InsertMode, NormalMode};
use overlay::{Overlay, OverlayEvent};
use buffer::Buffer;
use command::Command;
use command::{Action, BuilderEvent, Operation, Instruction};
/// The main Editor structure
///
/// This is the top-most structure in Iota.
pub struct Editor<'e, T: Frontend> {
buffers: Vec<Arc<Mutex<Buffer>>>,
view: View,
running: bool,
frontend: T,
mode: Box<Mode + 'e>,
}
impl<'e, T: Frontend> Editor<'e, T> {
/// Create a new Editor instance from the given source
pub fn new(source: Input, mode: Box<Mode + 'e>, frontend: T) -> Editor<'e, T> {
let height = frontend.get_window_height();
let width = frontend.get_window_width();
let mut buffers = Vec::new();
let buffer = Buffer::from(source);
buffers.push(Arc::new(Mutex::new(buffer)));
let view = View::new(buffers[0].clone(), width, height);
Editor {
buffers: buffers,
view: view,
running: true,
frontend: frontend,
mode: mode,
}
}
/// Handle key events
///
/// Key events can be handled in an Overlay, OR in the current Mode.
///
/// If there is an active Overlay, the key event is sent there, which gives
/// back an OverlayEvent. We then parse this OverlayEvent and determine if
/// the Overlay is finished and can be cleared. The response from the
/// Overlay is then converted to a Command and sent off to be handled.
///
/// If there is no active Overlay, the key event is sent to the current
/// Mode, which returns a Command which we dispatch to handle_command.
fn handle_key_event(&mut self, key: Option<Key>) {
let key = match key {
Some(k) => k,
None => return
};
let mut remove_overlay = false;
let command = match self.view.overlay {
Overlay::None => self.mode.handle_key_event(key),
_ => {
let event = self.view.overlay.handle_key_event(key);
match event {
OverlayEvent::Finished(response) => {
remove_overlay = true;
self.handle_overlay_response(response)
}
_ => { BuilderEvent::Incomplete }
}
}
};
if remove_overlay {
self.view.overlay = Overlay::None;
self.view.clear(&mut self.frontend);
}
if let BuilderEvent::Complete(c) = command {
self.handle_command(c);
}
}
/// Translate the response from an Overlay to a Command wrapped in a BuilderEvent
///
/// In most cases, we will just want to convert the response directly to
/// a Command, however in some cases we will want to perform other actions
/// first, such as in the case of Overlay::SavePrompt.
fn handle_overlay_response(&mut self, response: Option<String>) -> BuilderEvent {
// FIXME: This entire method neext to be updated
match response {
Some(data) => {
match self.view.overlay {
// FIXME: this is just a temporary fix
Overlay::Prompt { ref data, .. } => {
match &**data {
// FIXME: need to find a better system for these commands
// They should be chainable
// ie: wq - save & quit
// They should also take arguments
// ie w file.txt - write buffer to file.txt
"q" | "quit" => BuilderEvent::Complete(Command::exit_editor()),
"w" | "write" => BuilderEvent::Complete(Command::save_buffer()),
_ => BuilderEvent::Incomplete
}
}
Overlay::SavePrompt { .. } => {
if data.len() > 0 {
let path = PathBuf::from(&*data);
self.view.buffer.lock().unwrap().file_path = Some(path);
BuilderEvent::Complete(Command::save_buffer())
} else {
BuilderEvent::Invalid
}
}
Overlay::SelectFile { .. } => {
let path = PathBuf::from(data);
let buffer = Arc::new(Mutex::new(Buffer::from(path)));
self.buffers.push(buffer.clone());
self.view.set_buffer(buffer.clone());
self.view.clear(&mut self.frontend);
BuilderEvent::Complete(Command::noop())
}
_ => BuilderEvent::Incomplete,
}
}
None => BuilderEvent::Incomplete
}
}
/// Handle resize events
///
/// width and height represent the new height of the window.
fn handle_resize_event(&mut self, width: usize, height: usize) {
self.view.resize(width, height);
}
/// Draw the current view to the frontend
fn draw(&mut self) {
self.view.draw(&mut self.frontend);
}
/// Handle the given command, performing the associated action
fn handle_command(&mut self, command: Command) {
let repeat = if command.number > 0 {
command.number
} else { 1 };
for _ in 0..repeat {
match command.action {
Action::Instruction(i) => self.handle_instruction(i, command),
Action::Operation(o) => self.handle_operation(o, command),
}
}
}
fn handle_instruction(&mut self, instruction: Instruction, command: Command) {
match instruction {
Instruction::SaveBuffer => { self.view.try_save_buffer() }
Instruction::ExitEditor => { self.running = false; }
Instruction::SetMark(mark) => {
if let Some(object) = command.object {
self.view.move_mark(mark, object)
}
}
Instruction::SetOverlay(overlay_type) => {
self.view.set_overlay(overlay_type)
}
Instruction::SetMode(mode) => {
match mode {
ModeType::Insert => { self.mode = Box::new(InsertMode::new()) }
ModeType::Normal => { self.mode = Box::new(NormalMode::new()) }
}
}
Instruction::SwitchToLastBuffer => {
self.view.switch_last_buffer();
self.view.clear(&mut self.frontend);
}
_ => {}
}
}
fn handle_operation(&mut self, operation: Operation, command: Command) {
match operation {
Operation::Insert(c) => {
for _ in 0..command.number {
self.view.insert_char(c)
}
}
Operation::DeleteObject => {
if let Some(obj) = command.object {
self.view.delete_object(obj);
}
}
Operation::DeleteFromMark(m) => {
if command.object.is_some() {
self.view.delete_from_mark_to_object(m, command.object.unwrap())
}
}
Operation::Undo => { self.view.undo() }
Operation::Redo => { self.view.redo() }
}
}
/// Start Iota!
pub fn start(&mut self) {
while self.running {
self.draw();
self.frontend.present();
let event = self.frontend.poll_event();
match event {
EditorEvent::KeyEvent(key) => self.handle_key_event(key),
EditorEvent::Resize(width, height) => self.handle_resize_event(width, height),
_ => {}
}
}
}
}