fix: cleaned up code, fixed multi-op change issues

Cargo.toml

@@ -10,7 +10,7 @@ name = "codemp"
 # core
 tracing = "0.1"
 # woot
-codemp-woot = { git = "ssh://git@github.com/codewithotherpeopleandchangenamelater/woot.git", features = ["serde"], tag = "v0.1.1", optional = true }
+codemp-woot = { git = "ssh://git@github.com/codewithotherpeopleandchangenamelater/woot.git", features = ["serde"], tag = "v0.1.2", optional = true }
 # proto
 uuid = { version = "1.3.1", features = ["v4"], optional = true }
 tonic = { version = "0.9", features = ["tls", "tls-roots"], optional = true }

src/api/change.rs

@@ -3,7 +3,8 @@
 //! an editor-friendly representation of a text change in a buffer
 //! to easily interface with codemp from various editors
 
-use crate::proto::cursor::RowCol;
+#[cfg(feature = "woot")]
+use crate::woot::{WootResult, woot::Woot, crdt::{TextEditor, CRDT, Op}};
 
 /// an editor-friendly representation of a text change in a buffer
 ///
@@ -59,6 +60,33 @@ impl TextChange {
 		}
 	}
 
+	#[cfg(feature = "woot")]
+	pub fn transform(self, woot: &Woot) -> WootResult<Vec<Op>> {
+		let mut out = Vec::new();
+		if self.is_empty() { return Ok(out); } // no-op
+		let view = woot.view();
+		let Some(span) = view.get(self.span.clone()) else {
+			return Err(crate::woot::WootError::OutOfBounds);
+		};
+		let diff = similar::TextDiff::from_chars(span, &self.content);
+		for (i, diff) in diff.iter_all_changes().enumerate() {
+			match diff.tag() {
+				similar::ChangeTag::Equal => {},
+				similar::ChangeTag::Delete => match woot.delete_one(self.span.start + i) {
+					Err(e) => tracing::error!("could not create deletion: {}", e),
+					Ok(op) => out.push(op),
+				},
+				similar::ChangeTag::Insert => {
+					match woot.insert(self.span.start + i, diff.value()) {
+						Ok(mut op) => out.append(&mut op),
+						Err(e) => tracing::error!("could not create insertion: {}", e),
+					}
+				},
+			}
+		}
+		Ok(out)
+	}
+
 	/// returns true if this TextChange deletes existing text
 	pub fn is_deletion(&self) -> bool {
 		!self.span.is_empty()
@@ -84,11 +112,12 @@ impl TextChange {
 
 	/// convert from byte index to row and column
 	/// txt must be the whole content of the buffer, in order to count lines
-	pub fn index_to_rowcol(txt: &str, index: usize) -> RowCol {
+	#[cfg(feature = "transport")]
+	pub fn index_to_rowcol(txt: &str, index: usize) -> crate::proto::cursor::RowCol {
 		// FIXME might panic, use .get()
 		let row = txt[..index].matches('\n').count() as i32;
 		let col = txt[..index].split('\n').last().unwrap_or("").len() as i32;
-		RowCol { row, col }
+		crate::proto::cursor::RowCol { row, col }
 	}
 }
 

src/buffer/worker.rs

@@ -1,11 +1,10 @@
 use std::collections::hash_map::DefaultHasher;
 use std::hash::{Hash, Hasher};
 
-use similar::{TextDiff, ChangeTag};
 use tokio::sync::{watch, mpsc, oneshot};
 use tonic::{async_trait, Streaming};
 use uuid::Uuid;
-use woot::crdt::{Op, CRDT, TextEditor};
+use woot::crdt::{Op, CRDT};
 use woot::woot::Woot;
 
 use crate::errors::IgnorableError;
@@ -95,53 +94,22 @@ impl ControllerWorker<TextChange> for BufferWorker {
 
 				// received a text change from editor
 				res = self.operations.recv() => match res {
-					None => break,
-					Some(change) => {
-						if !change.is_empty() {
-							let view = self.buffer.view();
-							match view.get(change.span.clone()) {
-								None =>  tracing::error!("received illegal span from client: {:?} but buffer is of len {}", change.span, view.len()),
-								Some(span) => {
-									let diff = TextDiff::from_chars(span, &change.content);
-
-									let mut i = 0;
-									let mut ops = Vec::new();
-									for diff in diff.iter_all_changes() {
-										match diff.tag() {
-											ChangeTag::Equal => i += 1,
-											ChangeTag::Delete => match self.buffer.delete(change.span.start + i) {
-												Ok(op) => ops.push(op),
-												Err(e) => tracing::error!("could not apply deletion: {}", e),
-											},
-											ChangeTag::Insert => {
-												for c in diff.value().chars() {
-													match self.buffer.insert(change.span.start + i, c) {
-														Ok(op) => {
-															ops.push(op);
-															i += 1;
-														},
-														Err(e) => tracing::error!("could not apply insertion: {}", e),
-													}
-												}
-											},
-										}
-									}
-
-									for op in ops {
-										let operation = Operation { 
-											data: postcard::to_extend(&op, Vec::new()).unwrap(),
-										};
-	
-										match tx.send(operation).await {
-											Err(e) => tracing::error!("server refused to broadcast {}: {}", op, e),
-											Ok(()) => {
-												self.content.send(self.buffer.view()).unwrap_or_warn("could not send buffer update");
-											},
-										}
-									}
-								},
+					None => break tracing::debug!("stopping: editor closed channel"),
+					Some(change) => match change.transform(&self.buffer) {
+						Err(e) => break tracing::error!("could not apply operation from client: {}", e),
+						Ok(ops) => {
+							for op in ops {
+								self.buffer.merge(op.clone());
+								let operation = Operation { 
+									data: postcard::to_extend(&op, Vec::new()).unwrap(),
+								};
+								if let Err(e) = tx.send(operation).await {
+									tracing::error!("server refused to broadcast {}: {}", op, e);
+								}
 							}
-						}
+							self.content.send(self.buffer.view())
+								.unwrap_or_warn("could not send buffer update");
+						},
 					}
 				},