refactor: make send_keys a generic key sender, drop hardcoded Enter

lua/wiremux/backend/tmux/action.lua

@@ -50,10 +50,16 @@ function M.select_window(window_id)
 end
 
 ---@param target_id string
----@param keys string
+---@param keys string|string[] e.g. "Enter", { cmd, "Enter" }, { "Escape", "i" }, { "C-c" }
 ---@return string[]
 function M.send_keys(target_id, keys)
-	return { "send-keys", "-t", target_id, keys, "Enter" }
+	local cmd = { "send-keys", "-t", target_id }
+	if type(keys) == "table" then
+		vim.list_extend(cmd, keys)
+	else
+		table.insert(cmd, keys)
+	end
+	return cmd
 end
 
 ---@param buffer_name string

lua/wiremux/backend/tmux/operation.lua

@@ -18,7 +18,7 @@ local function submit(targets)
 	vim.defer_fn(function()
 		local batch = {}
 		for _, t in ipairs(targets) do
-			table.insert(batch, action.send_keys(t.id, ""))
+			table.insert(batch, action.send_keys(t.id, "Enter"))
 		end
 		client.execute(batch)
 	end, 300)
@@ -167,7 +167,7 @@ function M.create(target_name, def, st)
 	state.set_instance_metadata(id, target_name, st.origin_pane_id or "", vim.fn.getcwd(), kind)
 
 	if use_shell and cmd then
-		client.execute({ action.send_keys(id, cmd) })
+		client.execute({ action.send_keys(id, { cmd, "Enter" }) })
 	end
 
 	notify.debug("create: %s %s target=%s", kind, id, target_name)

tests/helpers_operation.lua

@@ -34,9 +34,7 @@ function M.setup()
 			set_pane_option = function(pane_id, key, value)
 				return { "set-option", "-p", "-t", pane_id, key, value }
 			end,
-			send_keys = function(target, keys)
-				return { "send-keys", "-t", target, keys, "Enter" }
-			end,
+			send_keys = require("wiremux.backend.tmux.action").send_keys,
 			new_window = function(name, command)
 				local cmd = { "new-window" }
 				if name then

tests/operation_spec.lua

@@ -2,6 +2,22 @@
 
 local helpers = require("tests.helpers_operation")
 
+describe("action.send_keys", function()
+	local action = require("wiremux.backend.tmux.action")
+
+	it("accepts single string key", function()
+		assert.are.same({ "send-keys", "-t", "%1", "Enter" }, action.send_keys("%1", "Enter"))
+	end)
+
+	it("accepts array of keys", function()
+		assert.are.same({ "send-keys", "-t", "%1", "i", "Enter" }, action.send_keys("%1", { "i", "Enter" }))
+	end)
+
+	it("accepts modifier keys", function()
+		assert.are.same({ "send-keys", "-t", "%1", "C-c" }, action.send_keys("%1", "C-c"))
+	end)
+end)
+
 describe("tmux operations", function()
 	local mocks
 
@@ -224,6 +240,28 @@ describe("tmux operations", function()
 			assert.are.equal("myapp", new_window_cmd[3])
 		end)
 
+		it("sends cmd with Enter for shell targets", function()
+			local shell_cmds
+			local call_count = 0
+
+			mocks.client.execute = function(cmds)
+				call_count = call_count + 1
+				if call_count == 1 then
+					return "%5"
+				else
+					shell_cmds = cmds
+					return "ok"
+				end
+			end
+
+			local st = { instances = {}, origin_pane_id = "%0" }
+			local def = { kind = "pane", shell = true, cmd = "npm start" }
+
+			mocks.operation.create("myapp", def, st)
+
+			assert.are.same({ { "send-keys", "-t", "%5", "npm start", "Enter" } }, shell_cmds)
+		end)
+
 		it("ignores function label for window name", function()
 			local captured_cmds
 			mocks.client.execute = function(cmds)