Ported config from nixvim.

Made some changes to taste along the way,
though there are some still to come.

lua/myLuaConf/LSPs/init.lua

@@ -2,6 +2,47 @@ local catUtils = require('nixCatsUtils')
 if (catUtils.isNixCats and nixCats('lspDebugMode')) then
   vim.lsp.set_log_level("debug")
 end
+-- we create a function that lets us more easily define mappings specific
+-- for LSP related items. It sets the mode, buffer and description for us each time.
+
+local lspmap = function(keys, func, desc)
+  if desc then
+    desc = 'LSP: ' .. desc
+  end
+
+  -- all of our LSP keybindings will be namespaced under <leader>l
+  keys = '<leader>l' .. keys
+
+  vim.keymap.set('n', keys, func, { buffer = bufnr, desc = desc })
+end
+
+lspmap('r', vim.lsp.buf.rename, '[R]ename')
+lspmap('a', vim.lsp.buf.code_action, '[C]ode Action')
+
+lspmap('d', vim.lsp.buf.definition, 'Goto [D]efinition')
+
+-- NOTE: why are these functions that call the telescope builtin?
+-- because otherwise they would load telescope eagerly when this is defined.
+-- due to us using the on_require handler to make sure it is available.
+if nixCats('telescope') then
+  lspmap('R', function() require('telescope.builtin').lsp_references() end, 'Goto [R]eferences')
+  lspmap('I', function() require('telescope.builtin').lsp_implementations() end, 'Goto [I]mplementation')
+  lspmap('s', function() require('telescope.builtin').lsp_document_symbols() end, 'Document [S]ymbols')
+  lspmap('ws', function() require('telescope.builtin').lsp_dynamic_workspace_symbols() end, '[W]orkspace [S]ymbols')
+end   -- TODO: Investigate whether I can replace these with snacsk.nvim.
+
+lspmap('D', vim.lsp.buf.type_definition, 'Type [D]efinition')
+lspmap('h', vim.lsp.buf.hover, 'Hover Documentation')
+lspmap('s', vim.lsp.buf.signature_help, 'Signature Documentation')
+lspmap('f', vim.lsp.buf.format, 'Format buffer')
+
+-- Lesser used LSP functionality
+lspmap('D', vim.lsp.buf.declaration, 'Goto [D]eclaration')
+lspmap('wa', vim.lsp.buf.add_workspace_folder, '[W]orkspace [A]dd Folder')
+lspmap('wr', vim.lsp.buf.remove_workspace_folder, '[W]orkspace [R]emove Folder')
+lspmap('wl', function()
+  print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
+end, '[W]orkspace [L]ist Folders')
 
 -- NOTE: This file uses lzextras.lsp handler https://github.com/BirdeeHub/lzextras?tab=readme-ov-file#lsp-handler
 -- This is a slightly more performant fallback function
@@ -9,7 +50,8 @@ end
 -- nixCats gives us the paths, which is faster than searching the rtp!
 local old_ft_fallback = require('lze').h.lsp.get_ft_fallback()
 require('lze').h.lsp.set_ft_fallback(function(name)
-  local lspcfg = nixCats.pawsible({ "allPlugins", "opt", "nvim-lspconfig" }) or nixCats.pawsible({ "allPlugins", "start", "nvim-lspconfig" })
+  local lspcfg = nixCats.pawsible({ "allPlugins", "opt", "nvim-lspconfig" }) or
+      nixCats.pawsible({ "allPlugins", "start", "nvim-lspconfig" })
   if lspcfg then
     local ok, cfg = pcall(dofile, lspcfg .. "/lsp/" .. name .. ".lua")
     if not ok then
@@ -23,7 +65,7 @@ end)
 require('lze').load {
   {
     "nvim-lspconfig",
-    for_cat = "general.core",
+    for_cat = "lsp",
     on_require = { "lspconfig" },
     -- NOTE: define a function for lsp,
     -- and it will run for all specs with type(plugin.lsp) == table
@@ -32,11 +74,6 @@ require('lze').load {
       vim.lsp.config(plugin.name, plugin.lsp or {})
       vim.lsp.enable(plugin.name)
     end,
-    before = function(_)
-      vim.lsp.config('*', {
-        on_attach = require('myLuaConf.LSPs.on_attach'),
-      })
-    end,
   },
   {
     "mason.nvim",
@@ -54,7 +91,7 @@ require('lze').load {
   {
     -- lazydev makes your lsp way better in your config without needing extra lsp configuration.
     "lazydev.nvim",
-    for_cat = "neonixdev",
+    for_cat = "lua",
     cmd = { "LazyDev" },
     ft = "lua",
     after = function(_)
@@ -68,7 +105,7 @@ require('lze').load {
   {
     -- name of the lsp
     "lua_ls",
-    enabled = nixCats('lua') or nixCats('neonixdev') or false,
+    enabled = nixCats('lua'),
     -- provide a table containing filetypes,
     -- and then whatever your functions defined in the function type specs expect.
     -- in our case, it just expects the normal lspconfig setup options,
@@ -93,33 +130,9 @@ require('lze').load {
     },
     -- also these are regular specs and you can use before and after and all the other normal fields
   },
-  {
-    "gopls",
-    for_cat = "go",
-    -- if you don't provide the filetypes it asks lspconfig for them
-    lsp = {
-      filetypes = { "go", "gomod", "gowork", "gotmpl" },
-    },
-  },
-  {
-    "rnix",
-    -- mason doesn't have nixd
-    enabled = not catUtils.isNixCats,
-    lsp = {
-      filetypes = { "nix" },
-    },
-  },
-  {
-    "nil_ls",
-    -- mason doesn't have nixd
-    enabled = not catUtils.isNixCats,
-    lsp = {
-      filetypes = { "nix" },
-    },
-  },
   {
     "nixd",
-    enabled = catUtils.isNixCats and (nixCats('nix') or nixCats('neonixdev')) or false,
+    enabled = catUtils.isNixCats and nixCats('lsp.nix'),
     lsp = {
       filetypes = { "nix" },
       settings = {
@@ -132,7 +145,7 @@ require('lze').load {
           nixpkgs = {
             -- in the extras set of your package definition:
             -- nixdExtras.nixpkgs = ''import ${pkgs.path} {}''
-            expr = nixCats.extra("nixdExtras.nixpkgs") or [[import <nixpkgs> {}]],
+            expr = nixCats.extra("nixdExtras.nixpkgs")
           },
           options = {
             -- If you integrated with your system flake,
@@ -152,7 +165,7 @@ require('lze').load {
             }
           },
           formatting = {
-            command = { "nixfmt" }
+            command = { "alejandra" }
           },
           diagnostic = {
             suppress = {
@@ -163,4 +176,8 @@ require('lze').load {
       },
     },
   },
+  {
+    "rustaceanvim",
+    for_cat = "lsp.rust",
+  },
 }