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//! The events that nvimpam needs to accept and deal with. They're sent by the
//! [`NeovimHandler`](::handler::NeovimHandler) to the main loop.
use std::{ffi::OsString, fmt, sync::mpsc};
use failure::{self, Error};
use neovim_lib::{
neovim::Neovim,
neovim_api::{Buffer, NeovimApi},
};
use folds::FoldList;
use lines::Lines;
/// The event list the main loop reacts to
pub enum Event {
/// The update notification for a buffer change. Full lines only. Firstline
/// is zero-indexed (i.e. a change on the first line will have `firstline =
/// 0`). The range from firstline to lastline is end-exclusive. `more`
/// indicates if we need to expect another event of this type with more
/// lines, in case Neovim decided to split up the buffer (not yet
/// implemented).
LinesEvent {
buf: Buffer,
changedtick: u64,
firstline: i64,
lastline: i64,
linedata: Vec<String>,
more: bool,
},
/// Update notification for a new `changedtick` without a buffer change.
/// Used by undo/redo.
ChangedTickEvent { buf: Buffer, changedtick: u64 },
/// Notification the liveupdates are ending. Possible causes:
/// - Closing all a buffer's windows (unless 'hidden' is enabled).
/// - Using |:edit| to reload the buffer
/// - reloading the buffer after it is changed from outside neovim.
DetachEvent { buf: Buffer },
/// Recreate and resend the folds
RefreshFolds,
/// This plugin should quit. Currently only sent by the user directly.
Quit,
}
impl Event {
/// Run the event loop. The receiver receives the events from the
/// [handler](::handler::NeovimHandler).
///
/// The loop starts by enabling
/// [buffer events](https://neovim.io/doc/user/api.html#nvim_buf_attach()).
/// It creates [`lines`](::lines::Lines),
/// [`keywords`](::card::keyword::Keywords) and a
/// [`foldlist`](::folds::FoldList) and updates them from the events
/// received. It calls [`resend_all`](::folds::FoldList::resend_all) when the
/// [`foldlist`](::folds::FoldList) was created, or the
/// [`RefreshFolds`](../event/enum.Event.html#variant.RefreshFolds) event was
/// sent.
///
/// Sending the [`Quit`](../event/enum.Event.html#variant.Quit) event will
/// exit the loop and return from the function.
pub fn event_loop(
receiver: &mpsc::Receiver<Event>,
mut nvim: Neovim,
file: Option<OsString>,
) -> Result<(), Error> {
use self::Event::*;
use card::keyword::Keywords;
let curbuf = nvim.get_current_buf()?;
let mut foldlist = FoldList::new();
let origlines;
let mut lines = Default::default();
let mut keywords: Keywords = Default::default();
let connected = match file {
None => curbuf.attach(&mut nvim, true, vec![])?,
Some(f) => {
origlines = Lines::read_file(f)?;
lines = Lines::from_slice(&origlines);
keywords = Keywords::from_lines(&lines);
foldlist.recreate_all(&keywords, &lines)?;
foldlist.resend_all(&mut nvim)?;
curbuf.attach(&mut nvim, false, vec![])?
}
};
if !connected {
return Err(failure::err_msg("Could not enable buffer updates!"));
}
loop {
match receiver.recv() {
Ok(LinesEvent {
firstline,
lastline,
linedata,
changedtick,
..
}) => {
if changedtick == 0 {
continue;
}
if lastline == -1 {
lines = Lines::from_vec(linedata);
keywords = Keywords::from_lines(&lines);
foldlist.recreate_all(&keywords, &lines)?;
foldlist.resend_all(&mut nvim)?;
} else if lastline >= 0 && firstline >= 0 {
keywords.update(firstline as usize, lastline as usize, &linedata);
lines.update(firstline as usize, lastline as usize, linedata);
foldlist.recreate_all(&keywords, &lines)?;
} else {
error!(
"LinesEvent only works with nonnegative numbers, except for
lastline = -1!"
);
}
}
Ok(RefreshFolds) => {
foldlist.resend_all(&mut nvim)?;
}
Ok(Quit) => {
break;
}
Ok(o) => {
warn!("receiver recieved {:?}", o);
}
Err(e) => {
warn!("receiver received error: {:?}", e);
}
}
}
info!("quitting");
Ok(())
}
}
impl fmt::Debug for Event {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use self::Event::*;
match *self {
LinesEvent {
changedtick,
firstline,
lastline,
ref linedata,
..
} => write!(
f,
"Update{{ changedtick: {}, firstline: {}, \
lastline: {}, #linedata: {} }}",
changedtick,
firstline,
lastline,
linedata.len()
),
ChangedTickEvent { changedtick, .. } => {
write!(f, "ChangedTick{{ changedtick: {} }}", changedtick,)
}
DetachEvent { .. } => write!(f, "UpdatesEnd"),
RefreshFolds => write!(f, "RefreshFolds"),
Quit => write!(f, "Quit"),
}
}
}