ref(nix): drop neovim legacy support

.config/nvim/lua/autocmds.lua

@@ -1,86 +0,0 @@
-local map = vim.keymap.set
-local autocmd = vim.api.nvim_create_autocmd
-local usercmd = vim.api.nvim_create_user_command
-
-vim.filetype.add { extension = { typ = "typst" } }
-vim.filetype.add { extension = { skel = "skel", sk = "skel" } }
-vim.filetype.add { extension = { mlw = "why3" } }
-
-autocmd("TextYankPost", {
-    callback = function() vim.highlight.on_yank() end,
-})
-
-autocmd("FileType", {
-    pattern  = { "markdown", "tex", "typst" },
-    callback = function()
-        vim.opt_local.shiftwidth = 2
-        vim.opt_local.tabstop    = 2
-        vim.opt_local.textwidth  = 80
-    end,
-})
-
-autocmd("Filetype", {
-    pattern  = "skel",
-    callback = function()
-        vim.opt_local.commentstring = "(* %s *)"
-        map("n", "<leader>f",
-            function()
-                vim.cmd ":w"
-                vim.cmd [[silent exec "!necroprint % -o %"]]
-                vim.cmd ":e"
-            end,
-            { buffer = true })
-    end,
-})
-
-autocmd("Filetype", {
-    pattern = "why3",
-    callback = function()
-        vim.opt_local.commentstring = "(* %s *)"
-        vim.opt_local.shiftwidth    = 2
-        vim.opt_local.tabstop       = 2
-        vim.opt_local.expandtab     = true
-    end,
-})
-
--- Using `sudoedit` would create gibberish extension names,
--- detection using extension would hence not work.
-autocmd("BufEnter", {
-    pattern  = "*Caddyfile*",
-    callback = function()
-        vim.opt_local.filetype      = "Caddy"
-        vim.opt_local.commentstring = "# %s"
-    end,
-})
-
--- Update leading indent guide
--- source: https://github.com/thaerkh/vim-indentguides
-autocmd("OptionSet", {
-    pattern  = "shiftwidth",
-    callback = function()
-        if vim.o.expandtab then
-            -- leadmultispace is shiftwidth agnostic
-            local c = ""
-            for _ = c:len(), vim.o.shiftwidth + 1, 1 do c = c .. " " end
-            vim.opt.listchars:append { leadmultispace = c }
-        end
-    end,
-})
-
--- Retab file with specified shiftwidth
-usercmd("Retab", function(opts)
-    if #opts.fargs ~= 2 then
-        print "should have two arguments"
-        return
-    end
-    local src          = tonumber(opts.fargs[1])
-    local dst          = tonumber(opts.fargs[2])
-    vim.opt.shiftwidth = src
-    vim.opt.tabstop    = src
-    vim.opt.expandtab  = false
-    vim.cmd "%retab!"
-    vim.opt.shiftwidth = dst
-    vim.opt.tabstop    = dst
-    vim.opt.expandtab  = true
-    vim.cmd "%retab!"
-end, { nargs = "+" })