use lua func in rhs instead of callback

core/mappings.lua

@@ -85,16 +85,15 @@ keymap.set("n", "<leader>ev", "<cmd>tabnew $MYVIMRC <bar> tcd %:h<cr>", {
   desc = "open init.lua",
 })
 
-keymap.set("n", "<leader>sv", "", {
-  silent = true,
-  desc = "reload init.lua",
-  callback = function()
-    vim.cmd([[
+keymap.set("n", "<leader>sv", function()
+  vim.cmd([[
       update $MYVIMRC
       source $MYVIMRC
     ]])
-    vim.notify("Nvim config successfully reloaded!", vim.log.levels.INFO, { title = "nvim-config" })
-  end,
+  vim.notify("Nvim config successfully reloaded!", vim.log.levels.INFO, { title = "nvim-config" })
+end, {
+  silent = true,
+  desc = "reload init.lua",
 })
 
 -- Reselect the text that has just been pasted, see also https://stackoverflow.com/a/4317090/6064933.
@@ -173,25 +172,23 @@ keymap.set({ "x", "o" }, "iu", "<cmd>call text_obj#URL()<cr>", { desc = "URL tex
 keymap.set({ "x", "o" }, "iB", "<cmd>call text_obj#Buffer()<cr>", { desc = "buffer text object" })
 
 -- Do not move my cursor when joining lines.
-keymap.set("n", "J", "", {
-  desc = "join line",
-  callback = function()
-    vim.cmd([[
+keymap.set("n", "J", function()
+  vim.cmd([[
       normal! mzJ`z
       delmarks z
     ]])
-  end,
+end, {
+  desc = "join line",
 })
 
-keymap.set("n", "gJ", "mzgJ`z", {
-  desc = "join visual lines",
-  callback = function()
-    -- we must use `normal!`, otherwise it will trigger recursive mapping
-    vim.cmd([[
+keymap.set("n", "gJ", function()
+  -- we must use `normal!`, otherwise it will trigger recursive mapping
+  vim.cmd([[
       normal! zmgJ`z
       delmarks z
     ]])
-  end,
+end, {
+  desc = "join visual lines",
 })
 
 -- Break inserted text into smaller undo units when we insert some punctuation chars.