feat: follow others

lua/codemp/buffers.lua

@@ -92,6 +92,7 @@ local function attach(name, buffer, content, nowait)
 				local event = controller:try_recv():await()
 				if event == nil then break end
 				ticks[buffer] = vim.api.nvim_buf_get_changedtick(buffer)
+				CODEMP.ignore_following_action = true
 				if CODEMP.config.debug then
 					print(" ~~ applying change ~~ " .. event.start .. ".." .. event.finish .. "::[" .. event.content .. "]")
 				end

lua/codemp/init.lua

@@ -10,12 +10,16 @@ if CODEMP == nil then
 	---@field available WorkspaceReference[] available workspaces to connect to
 	---@field timer? any libuv timer
 	---@field config Config codemp configuration
+	---@field following string | nil
+	---@field ignore_following_action boolean TODO a more elegant solution?
 	---@field setup fun(opts: Config): nil update config and setup plugin
 	CODEMP = {
 		rt = nil,
 		native = nil,
 		timer = nil,
 		available = {},
+		following = nil,
+		ignore_following_action = false,
 		config = {
 			neo_tree = false,
 			timer_interval = 20,

lua/codemp/neo-tree/commands.lua

@@ -53,17 +53,24 @@ M.open = function(state, path, extra)
 		return
 	end
 	if selected.type == "user" then
+		if CODEMP.workspace == nil then error("cannot follow while not in a workspace") end
 		local usr = ws_manager.map[selected.name]
+		print(" /\\/ following " .. selected.name)
+		CODEMP.following = selected.name
+		local _ = CODEMP.workspace.cursor:send({
+			buffer = "",
+			start = { 0, 0 },
+			finish = { 0, 0 },
+		}) -- clear current cursor
 		if usr ~= nil then
 			local buf_name = buf_manager.users[selected.name]
 			local buf_id = buf_manager.map_rev[buf_name]
 			if buf_id ~= nil then
 				local win = utils.get_appropriate_window(state)
+				CODEMP.ignore_following_action = true
 				vim.api.nvim_set_current_win(win)
 				vim.api.nvim_win_set_buf(win, buf_id)
 				vim.api.nvim_win_set_cursor(win, { usr.pos[1] + 1, usr.pos[2] })
-			else
-				print(" /!\\ not attached to buffer '" .. buf_name .. "'")
 			end
 		end
 		return

lua/codemp/workspace.lua

@@ -38,7 +38,14 @@ local function register_cursor_callback(ws)
 	local once = true
 	vim.api.nvim_create_autocmd({"CursorMoved", "CursorMovedI", "ModeChanged"}, {
 		group = vim.api.nvim_create_augroup("codemp-workspace-" .. ws.name, { clear = true }),
-		callback = function (_)
+		callback = function (ev)
+			if CODEMP.ignore_following_action then
+				CODEMP.ignore_following_action = false
+				return
+			elseif CODEMP.following ~= nil then
+				print(" / / unfollowing " .. CODEMP.following)
+				CODEMP.following = nil
+			end
 			local cur = utils.cursor.position()
 			local buf = vim.api.nvim_get_current_buf()
 			if buffers.map[buf] ~= nil then
@@ -117,6 +124,18 @@ local function register_cursor_handler(ws)
 				if old_buffer ~= event.buffer then
 					require('codemp.window').update() -- redraw user positions
 				end
+				if CODEMP.following ~= nil and CODEMP.following == event.user then
+					local buf_id = buffers.map_rev[event.buffer]
+					if buf_id ~= nil then
+						local win = vim.api.nvim_get_current_win()
+						local curr_buf = vim.api.nvim_get_current_buf()
+						CODEMP.ignore_following_action = true
+						if curr_buf ~= buf_id then
+							vim.api.nvim_win_set_buf(win, buf_id)
+						end
+						vim.api.nvim_win_set_cursor(win, { event.start[1] + 1, event.start[2] })
+					end
+				end
 			end
 		end
 	end))