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use anyhow::Error;
use std::future::Future;
use std::path::{Path, PathBuf};
use helix_core::{
syntax::LOADER, ChangeSet, Diagnostic, History, Position, Range, Rope, RopeSlice, Selection,
State, Syntax, Transaction,
};
#[derive(Copy, Clone, PartialEq, Eq, Hash)]
pub enum Mode {
Normal,
Insert,
Goto,
}
pub struct Document {
pub state: State, // rope + selection
/// File path on disk.
pub path: Option<PathBuf>,
/// Current editing mode.
pub mode: Mode,
pub restore_cursor: bool,
/// Tree-sitter AST tree
pub syntax: Option<Syntax>,
/// Corresponding language scope name. Usually `source.<lang>`.
pub language: Option<String>,
/// Pending changes since last history commit.
pub changes: ChangeSet,
pub old_state: Option<State>,
pub history: History,
pub version: i32, // should be usize?
pub diagnostics: Vec<Diagnostic>,
}
/// Like std::mem::replace() except it allows the replacement value to be mapped from the
/// original value.
fn take_with<T, F>(mut_ref: &mut T, closure: F)
where
F: FnOnce(T) -> T,
{
use std::{panic, ptr};
unsafe {
let old_t = ptr::read(mut_ref);
let new_t = panic::catch_unwind(panic::AssertUnwindSafe(|| closure(old_t)))
.unwrap_or_else(|_| ::std::process::abort());
ptr::write(mut_ref, new_t);
}
}
use url::Url;
impl Document {
fn new(state: State) -> Self {
let changes = ChangeSet::new(&state.doc);
let old_state = None;
Self {
path: None,
state,
mode: Mode::Normal,
restore_cursor: false,
syntax: None,
language: None,
changes,
old_state,
diagnostics: Vec::new(),
version: 0,
history: History::default(),
}
}
// TODO: passing scopes here is awkward
// TODO: async fn?
pub fn load(path: PathBuf, scopes: &[String]) -> Result<Self, Error> {
use std::{env, fs::File, io::BufReader};
let _current_dir = env::current_dir()?;
let doc = Rope::from_reader(BufReader::new(File::open(path.clone())?))?;
// TODO: create if not found
let mut doc = Self::new(State::new(doc));
if let Some(language_config) = LOADER.language_config_for_file_name(path.as_path()) {
let highlight_config = language_config.highlight_config(scopes).unwrap().unwrap();
// TODO: config.configure(scopes) is now delayed, is that ok?
let syntax = Syntax::new(&doc.state.doc, highlight_config.clone());
doc.syntax = Some(syntax);
// TODO: maybe just keep an Arc<> pointer to the language_config?
doc.language = Some(language_config.scope().to_string());
// TODO: this ties lsp support to tree-sitter enabled languages for now. Language
// config should use Option<HighlightConfig> to let us have non-tree-sitter configs.
// TODO: circular dep: view <-> lsp
// helix_lsp::REGISTRY;
// view should probably depend on lsp
};
// canonicalize path to absolute value
doc.path = Some(std::fs::canonicalize(path)?);
Ok(doc)
}
// TODO: do we need some way of ensuring two save operations on the same doc can't run at once?
// or is that handled by the OS/async layer
pub fn save(&self) -> impl Future<Output = Result<(), anyhow::Error>> {
// we clone and move text + path into the future so that we asynchronously save the current
// state without blocking any further edits.
let text = self.text().clone();
let path = self.path.clone().expect("Can't save with no path set!"); // TODO: handle no path
// TODO: mark changes up to now as saved
// TODO: mark dirty false
async move {
use smol::{fs::File, prelude::*};
let mut file = File::create(path).await?;
// write all the rope chunks to file
for chunk in text.chunks() {
file.write_all(chunk.as_bytes()).await?;
}
// TODO: flush?
Ok(())
} // and_then(// lsp.send_text_saved_notification())
}
pub fn set_language(&mut self, scope: &str, scopes: &[String]) {
if let Some(language_config) = LOADER.language_config_for_scope(scope) {
let highlight_config = language_config.highlight_config(scopes).unwrap().unwrap();
// TODO: config.configure(scopes) is now delayed, is that ok?
let syntax = Syntax::new(&self.state.doc, highlight_config.clone());
self.syntax = Some(syntax);
};
}
pub fn set_selection(&mut self, selection: Selection) {
// TODO: use a transaction?
self.state.selection = selection;
}
pub fn apply(&mut self, transaction: &Transaction) -> bool {
let old_doc = self.text().clone();
// store the state just before any changes are made. This allows us to undo to the
// state just before a transaction was applied.
if self.changes.is_empty() && !transaction.changes().is_empty() {
self.old_state = Some(self.state.clone());
}
let success = transaction.apply(&mut self.state);
if !transaction.changes().is_empty() {
// Compose this transaction with the previous one
take_with(&mut self.changes, |changes| {
changes.compose(transaction.changes().clone()).unwrap()
});
// TODO: when composing, replace transaction.selection too
// update tree-sitter syntax tree
if let Some(syntax) = &mut self.syntax {
// TODO: no unwrap
syntax
.update(&old_doc, &self.state.doc, transaction.changes())
.unwrap();
}
// TODO: map state.diagnostics over changes::map_pos too
}
success
}
#[inline]
pub fn mode(&self) -> Mode {
self.mode
}
#[inline]
pub fn path(&self) -> Option<&PathBuf> {
self.path.as_ref()
}
pub fn url(&self) -> Option<Url> {
self.path().map(|path| Url::from_file_path(path).unwrap())
}
pub fn text(&self) -> &Rope {
&self.state.doc
}
pub fn selection(&self) -> &Selection {
&self.state.selection
}
pub fn relative_path(&self) -> Option<&Path> {
self.path.as_ref().map(|path| {
path.strip_prefix(std::env::current_dir().unwrap())
.unwrap_or(path)
})
}
// pub fn slice<R>(&self, range: R) -> RopeSlice where R: RangeBounds {
// self.state.doc.slice
// }
// TODO: transact(Fn) ?
}
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