First version

lua/user/cursor.lua

@@ -0,0 +1,23 @@
+-- Terminal cursor shapes (Vim t_SI / t_EI / t_SR). Many Neovim builds no longer define these; pcall skips safely.
+
+local esc = '\27'
+
+local function set_termcap(name, value)
+  pcall(function()
+    vim.o[name] = value
+  end)
+end
+
+if vim.env.TMUX then
+  set_termcap('t_SI', esc .. 'Ptmux;' .. esc .. esc .. '[6 q' .. esc .. '\\')
+  set_termcap('t_EI', esc .. 'Ptmux;' .. esc .. esc .. '[2 q' .. esc .. '\\')
+else
+  set_termcap('t_SI', esc .. '[6 q') -- insert: bar
+  set_termcap('t_EI', esc .. '[2 q') -- normal: block
+end
+
+set_termcap('t_SR', esc .. '[4 q') -- replace: underline
+
+-- Modern Neovim uses guicursor for mode shapes (also in many terminals/UIs).
+-- Keep operator-pending block so d/c don't look like replace mode.
+vim.opt.guicursor = 'n-v-c-sm:block,i-ci-ve:ver25,r-cr:hor20,o:block'