feat: more capillar but broken text changes

requires more help from codemp lib

src/codemp.lua

@@ -1,22 +1,52 @@
 local codemp = require("libcodemp_nvim")
 
-local function register_async_waker(target, cb)
-	local async = vim.loop.new_async(cb)
-	vim.loop.new_thread(function(_async, _target)
-		local _codemp = require("libcodemp_nvim")
-		local _cntrl
-		if _target ~= nil then
-			_cntrl = _codemp.get_buffer(_target)
-		else
-			_cntrl = _codemp.get_cursor()
-		end
+local codemp_changed_tick = nil -- TODO this doesn't work when events are coalesced
+
+local function register_controller_handler(target, controller, handler)
+	local async = vim.loop.new_async(function()
 		while true do
-			_cntrl:poll()
+			local event = controller:try_recv()
+			if event == nil then break end
+			vim.schedule(function() handler(event) end)
+		end
+	end)
+	-- TODO controller can't be passed to the uvloop new_thread: when sent to the new 
+	--  Lua runtime it "loses" its methods defined with mlua, making the userdata object 
+	--  completely useless. We can circumvent this by requiring codemp again in the new 
+	--  thread and requesting a new reference to the same controller from che global instance
+	-- NOTE variables prefixed with underscore live in another Lua runtime
+	vim.loop.new_thread({}, function(_async, _target)
+		local _codemp = require("libcodemp_nvim")
+		local _controller = _target ~= nil and _codemp.get_buffer(_target) or _codemp.get_cursor()
+		while true do
+			_controller:poll()
 			_async:send()
 		end
 	end, async, target)
 end
 
+-- local function byte2rowcol(buf, x)
+-- 	local row
+-- 	local row_start
+-- 	vim.api.nvim_buf_call(buf, function ()
+-- 		row = vim.fn.byte2line(x)
+-- 		row_start = vim.fn.line2byte(row)
+-- 	end)
+-- 	local col = x - row_start
+-- 	return { row, col }
+-- end
+
+local function split_without_trim(str, sep)
+	local res = vim.fn.split(str, sep)
+	if str:sub(1,1) == "\n" then
+		table.insert(res, 1, '')
+	end
+	if str:sub(-1) == "\n" then
+		table.insert(res, '')
+	end
+	return res
+end
+
 local function order_tuples(x) -- TODO send help...
 	if x[1][1] < x[2][1] then
 		return { { x[1][1], x[1][2] }, { x[2][1], x[2][2] } }
@@ -31,10 +61,20 @@ end
 
 local function cursor_position()
 	local mode = vim.api.nvim_get_mode().mode
-	if mode == "v" or mode == "V" then
+	if mode == "v" then
 		local _, ls, cs = unpack(vim.fn.getpos('v'))
 		local _, le, ce = unpack(vim.fn.getpos('.'))
 		return order_tuples({ { ls-1, cs-1 }, { le-1, ce } })
+	elseif mode == "V" then
+		local _, ls, _ = unpack(vim.fn.getpos('v'))
+		local _, le, _ = unpack(vim.fn.getpos('.'))
+		if le > ls then
+			local ce = vim.fn.strlen(vim.fn.getline(le))
+			return { { ls-1, 0 }, { le-1, ce } }
+		else
+			local ce = vim.fn.strlen(vim.fn.getline(ls))
+			return { { le-1, 0 }, { ls-1, ce } }
+		end
 	else
 		local win = vim.api.nvim_get_current_win()
 		local cur = vim.api.nvim_win_get_cursor(win)
@@ -51,7 +91,7 @@ local function buffer_get_content(buf)
 end
 
 local function buffer_set_content(buf, content)
-	local lines = vim.fn.split(content, "\n")
+	local lines = split_without_trim(content, "\n")
 	vim.api.nvim_buf_set_lines(buf, 0, -1, false, lines)
 end
 
@@ -86,7 +126,7 @@ vim.api.nvim_create_user_command(
 		local ns = vim.api.nvim_create_namespace("codemp-cursors")
 
 		-- hook serverbound callbacks
-		vim.api.nvim_create_autocmd({"CursorMoved", "CursorMovedI"}, {
+		vim.api.nvim_create_autocmd({"CursorMoved", "CursorMovedI", "ModeChanged"}, {
 			group = vim.api.nvim_create_augroup("codemp-workspace-" .. args.args, { clear = true }),
 			callback = function (_)
 				local cur = cursor_position()
@@ -95,15 +135,9 @@ vim.api.nvim_create_user_command(
 		})
 
 		-- hook clientbound callbacks
-		register_async_waker(nil, function()
-			while true do
-				local event = controller:try_recv()
-				if event == nil then break end
-				vim.schedule(function()
-					vim.api.nvim_buf_clear_namespace(buffer, ns, 0, -1)
-					multiline_highlight(buffer, ns, "ErrorMsg", event.start, event.finish)
-				end)
-			end
+		register_controller_handler(nil, controller, function(event)
+			vim.api.nvim_buf_clear_namespace(buffer, ns, 0, -1)
+			multiline_highlight(buffer, ns, "ErrorMsg", event.start, event.finish)
 		end)
 
 		print(" ++ joined workspace " .. args.args)
@@ -130,24 +164,42 @@ vim.api.nvim_create_user_command(
 	"Attach",
 	function (args)
 		local controller = codemp.attach(args.args)
+
 		local buffer = vim.api.nvim_get_current_buf()
 
 		buffer_set_content(buffer, controller.content)
 
 		-- hook serverbound callbacks
-		vim.api.nvim_create_autocmd({"CursorMoved", "CursorMovedI"}, {
-			group = vim.api.nvim_create_augroup("codemp-buffer-" .. args.args, { clear = true }),
-			buffer = buffer,
-			callback = function (_)
-				controller:replace(buffer_get_content(buffer))
+		vim.api.nvim_buf_attach(buffer, false, {
+			on_lines = function (_, buf, tick, firstline, lastline, new_lastline, old_byte_size)
+				if tick == codemp_changed_tick then return end
+				print(string.format(">[%s] %s:%s|%s (%s)", tick, firstline, lastline, new_lastline, old_byte_size))
+				local start_index = firstline == 0 and 0 or vim.fn.line2byte(firstline + 1) - 1
+				local text = table.concat(
+					vim.api.nvim_buf_get_lines(buf, firstline, new_lastline, true),
+					"\n"
+				)
+				if lastline ~= new_lastline then
+					text = text .. "\n"
+				end
+				print(string.format(">delta [%d,%s,%d]", start_index, text, start_index + old_byte_size - 1))
+				controller:delta(start_index, text, start_index + old_byte_size - 1)
 			end
 		})
 
 		-- hook clientbound callbacks
-		register_async_waker(args.args, function()
-			vim.schedule(function()
-				buffer_set_content(buffer, controller.content)
-			end)
+		register_controller_handler(args.args, controller, function(event)
+			codemp_changed_tick = vim.api.nvim_buf_get_changedtick(buffer) + 1
+			local start = controller:byte2rowcol(event.start)
+			local finish = controller:byte2rowcol(event.finish)
+			print(string.format(
+				"buf_set_text(%s,%s, %s,%s, '%s')",
+				start.row, start.col, finish.row, finish.col, vim.inspect(split_without_trim(event.content, "\n"))
+			))
+			vim.api.nvim_buf_set_text(
+				buffer, start.row, start.col, finish.row, finish.col,
+				split_without_trim(event.content, "\n")
+			)
 		end)
 
 		print(" ++ joined workspace " .. args.args)
@@ -160,5 +212,6 @@ return {
 	utils = {
 		buffer = buffer_get_content,
 		cursor  = cursor_position,
+		split = split_without_trim,
 	}
 }

src/lib.rs

@@ -13,6 +13,16 @@ impl From::<LuaCodempError> for LuaError {
 	}
 }
 
+fn byte_to_rowcol(text: &str, index: usize) -> CodempRowCol {
+	let lines_before = text[..index].split('\n').count() - 1;
+	let chars_before = text[..index].split('\n').last().unwrap_or_default().len();
+
+	CodempRowCol {
+		row: lines_before as i32,
+		col: chars_before as i32,
+	}
+}
+
 fn cursor_to_table(lua: &Lua, cur: CodempCursorEvent) -> LuaResult<LuaTable> {
 	let pos = cur.position.unwrap_or_default();
 	let start = lua.create_table()?;
@@ -96,45 +106,6 @@ impl LuaUserData for LuaCursorController {
 	}
 }
 
-// #[derive(derive_more::From)]
-// struct LuaCursorEvent(CodempCursorEvent);
-// impl LuaUserData for LuaCursorEvent {
-// 	fn add_fields<'lua, F: LuaUserDataFields<'lua, Self>>(fields: &mut F) {
-// 		fields.add_field_method_get("user", |_, this| Ok(this.0.user));
-// 		fields.add_field_method_set("user", |_, this, val| Ok(this.0.user = val));
-// 
-// 		fields.add_field_method_get("user", |_, this| Ok(this.0.user));
-// 		fields.add_field_method_set("user", |_, this, val| Ok(this.0.user = val));
-// 	}
-// }
-// 
-// #[derive(derive_more::From)]
-// struct LuaCursorPosition(CodempCursorPosition);
-// impl LuaUserData for LuaCursorPosition {
-// 	fn add_fields<'lua, F: LuaUserDataFields<'lua, Self>>(fields: &mut F) {
-// 		fields.add_field_method_get("buffer", |_, this| Ok(this.0.buffer));
-// 		fields.add_field_method_set("buffer", |_, this, val| Ok(this.0.buffer = val));
-// 
-// 		fields.add_field_method_get("start", |_, this| Ok(this.0.start.into()));
-// 		fields.add_field_method_set("start", |_, this, (val,):(LuaRowCol,)| Ok(this.0.start = Some(val.0)));
-// 
-// 		fields.add_field_method_get("end", |_, this| Ok(this.0.end.unwrap_or_default()));
-// 		fields.add_field_method_set("end", |_, this, val| Ok(this.0.end = Some(val)));
-// 	}
-// }
-// 
-// #[derive(derive_more::From)]
-// struct LuaRowCol(CodempRowCol);
-// impl LuaUserData for LuaRowCol {
-// 	fn add_fields<'lua, F: LuaUserDataFields<'lua, Self>>(fields: &mut F) {
-// 		fields.add_field_method_get("row", |_, this| Ok(this.0.col));
-// 		fields.add_field_method_set("row", |_, this, val| Ok(this.0.col = val));
-// 
-// 		fields.add_field_method_get("col", |_, this| Ok(this.0.col));
-// 		fields.add_field_method_set("col", |_, this, val| Ok(this.0.col = val));
-// 	}
-// }
-
 
 
 /// create a new buffer in current workspace
@@ -161,7 +132,7 @@ impl LuaUserData for LuaBufferController {
 		methods.add_method("delta", |_, this, (start, txt, end):(usize, String, usize)| {
 			match this.0.delta(start, &txt, end) {
 				Some(op) => Ok(this.0.send(op).map_err(LuaCodempError::from)?),
-				None => Ok(()),
+				None => Err(LuaError::RuntimeError("wtf".into())),
 			}
 		});
 		methods.add_method("replace", |_, this, txt:String| {
@@ -184,6 +155,10 @@ impl LuaUserData for LuaBufferController {
 					.map_err(LuaCodempError::from)?;
 			Ok(())
 		});
+
+		methods.add_method("byte2rowcol", |_, this, (byte,)| {
+			Ok(LuaRowCol(byte_to_rowcol(&this.0.content(), byte)))
+		});
 	}
 
 	fn add_fields<'lua, F: LuaUserDataFields<'lua, Self>>(fields: &mut F) {
@@ -205,6 +180,15 @@ impl LuaUserData for LuaTextChange {
 	}
 }
 
+#[derive(Debug, derive_more::From)]
+struct LuaRowCol(CodempRowCol);
+impl LuaUserData for LuaRowCol {
+	fn add_fields<'lua, F: LuaUserDataFields<'lua, Self>>(fields: &mut F) {
+		fields.add_field_method_get("row", |_, this| Ok(this.0.row));
+		fields.add_field_method_get("col", |_, this| Ok(this.0.col));
+	}
+}
+
 
 
 #[mlua::lua_module]
@@ -216,5 +200,17 @@ fn libcodemp_nvim(lua: &Lua) -> LuaResult<LuaTable> {
 	exports.set("attach",  lua.create_function(attach)?)?;
 	exports.set("get_cursor", lua.create_function(get_cursor)?)?;
 	exports.set("get_buffer", lua.create_function(get_buffer)?)?;
+	exports.set("byte2rowcol",lua.create_function(byte2rowcol)?)?;
 	Ok(exports)
 }
+
+
+// TODO this is wasteful because, just to calculate two indices, we clone a 
+//  potentially big string. this is necessary because vim doesn't provide an 
+//  api equivalent of byte2line (we need to specify arbitrary buffers).
+fn byte2rowcol(_: &Lua, (txt, index): (String, usize)) -> LuaResult<(usize, usize)> {
+	let lines = txt[..index].split('\n');
+	let col = lines.clone().last().unwrap_or("").len();
+	let row = lines.count() - 1;
+	Ok((row, col))
+}