Fix when you can move, swap, and resize

lua/winmove/init.lua

@@ -137,15 +137,15 @@ end
 ---@param mode winmove.Mode
 ---@return boolean
 local function can_move_or_swap(win_id, mode)
-    local at_edge_horizontal = config.modes.move.at_edge.horizontal
+    local at_edge_horizontal = config.modes[mode].at_edge.horizontal
 
     if at_edge_horizontal == winmove.AtEdge.MoveToTab then
         if winutil.window_count() == 1 and vim.fn.tabpagenr("$") == 1 then
             ---@cast mode string
             message.error(("Cannot %s window, only one window and tab"):format(mode:lower()))
             return false
         end
-    elseif at_edge_horizontal == winmove.AtEdge.Wrap then
+    else
         if winutil.window_count() == 1 then
             ---@cast mode string
             message.error(("Cannot %s window, only one window"):format(mode:lower()))
@@ -681,8 +681,15 @@ end
 start_mode = function(mode)
     local cur_win_id = api.nvim_get_current_win()
 
-    if not can_move_or_swap(cur_win_id, mode) then
-        return
+    if mode == winmove.Mode.Resize then
+        if winutil.window_count() == 1 then
+            message.error("Cannot resize window, only one window")
+            return
+        end
+    else
+        if not can_move_or_swap(cur_win_id, mode) then
+            return
+        end
     end
 
     if winmove.current_mode() == mode then
@@ -777,6 +784,10 @@ function winmove.resize_window(win_id, dir, count, anchor)
         anchor = { anchor, resize.is_valid_anchor, "a valid anchor" },
     })
 
+    if winutil.window_count() == 1 then
+        return
+    end
+
     winutil.wincall(win_id, function()
         resize.resize_window(win_id, dir, count, anchor)
     end)

tests/init_spec.lua

@@ -1,17 +1,22 @@
 local message = require("winmove.message")
 local stub = require("luassert.stub")
 local winmove = require("winmove")
+local vader = require("winmove.util.vader")
+
+local given = vader.given
 
 describe("init", function()
     it("starts and stops a mode", function()
-        -- Split a window so we can start move mode
-        vim.cmd.split()
+        given(function()
+            -- Split a window so we can start move mode
+            vim.cmd.split()
 
-        winmove.start_mode(winmove.Mode.Move)
-        assert.are.same(winmove.current_mode(), winmove.Mode.Move)
+            winmove.start_mode(winmove.Mode.Move)
+            assert.are.same(winmove.current_mode(), winmove.Mode.Move)
 
-        winmove.stop_mode()
-        assert.is_nil(winmove.current_mode())
+            winmove.stop_mode()
+            assert.is_nil(winmove.current_mode())
+        end)
     end)
 
     it("validates arguments of start_mode", function()
@@ -108,4 +113,28 @@ describe("init", function()
             winmove.resize_window(1000, "h", 1, "top_right")
         end, "anchor: expected a valid anchor, got top_right")
     end)
+
+    it("does not start resize mode if only one window", function()
+        stub(message, "error")
+
+        winmove.start_mode(winmove.Mode.Resize)
+        assert.are.same(winmove.current_mode(), nil)
+
+        assert.stub(message.error).was.called_with("Cannot resize window, only one window")
+
+        ---@diagnostic disable-next-line: undefined-field
+        message.error:revert()
+    end)
+
+    it("does not start resize mode if only one window", function()
+        stub(message, "error")
+
+        winmove.start_mode(winmove.Mode.Resize)
+        assert.are.same(winmove.current_mode(), nil)
+
+        assert.stub(message.error).was.called_with("Cannot resize window, only one window")
+
+        ---@diagnostic disable-next-line: undefined-field
+        message.error:revert()
+    end)
 end)

tests/swap_mode_spec.lua

@@ -1,3 +1,6 @@
+local config = require("winmove.config")
+local message = require("winmove.message")
+local stub = require("luassert.stub")
 local winmove = require("winmove")
 local vader = require("winmove.util.vader")
 local test_helpers = require("winmove.util.test_helpers")
@@ -149,4 +152,53 @@ describe("swap mode", function()
             assert.are.same(vim.api.nvim_win_get_buf(target_win_id), bufnr1)
         end)
     end)
+
+    it("does not start swap mode if only one window", function()
+        config.configure({
+            modes = {
+                swap = {
+                    at_edge = {
+                        horizontal = "none",
+                    },
+                },
+            },
+        })
+
+        stub(message, "error")
+
+        winmove.start_mode(winmove.Mode.Swap)
+        assert.are.same(winmove.current_mode(), nil)
+
+        assert.stub(message.error).was.called_with("Cannot swap window, only one window")
+
+        ---@diagnostic disable-next-line: undefined-field
+        message.error:revert()
+    end)
+
+    it(
+        "does not start swap mode if only one window and tab and at-edge behaviour is MoveToTab",
+        function()
+            config.configure({
+                modes = {
+                    swap = {
+                        at_edge = {
+                            horizontal = "move_to_tab",
+                        },
+                    },
+                },
+            })
+
+            stub(message, "error")
+
+            winmove.start_mode(winmove.Mode.Swap)
+            assert.are.same(winmove.current_mode(), nil)
+
+            assert
+                .stub(message.error).was
+                .called_with("Cannot swap window, only one window and tab")
+
+            ---@diagnostic disable-next-line: undefined-field
+            message.error:revert()
+        end
+    )
 end)