Add cmp, and some auto formatting and inlay hints to lsps, add some tweaks to clangd

nvim/lua/plugs/cmp.lua

@@ -0,0 +1,67 @@
+return {
+    "hrsh7th/nvim-cmp",
+    dependencies = {
+        "hrsh7th/cmp-nvim-lsp",
+        "hrsh7th/cmp-buffer",
+        "hrsh7th/cmp-path",
+        "hrsh7th/cmp-cmdline",
+    },
+    config = function()
+        -- Set up nvim-cmp.
+        local cmp = require("cmp")
+
+        cmp.setup({
+            snippet = {
+                expand = function(args)
+                    vim.snippet.expand(args.body) -- For native neovim snippets (Neovim v0.10+)
+                end,
+            },
+            window = {
+                completion = cmp.config.window.bordered(),
+                documentation = cmp.config.window.bordered(),
+            },
+            mapping = cmp.mapping.preset.insert({
+                ["<C-b>"] = cmp.mapping.scroll_docs(-4),
+                ["<C-f>"] = cmp.mapping.scroll_docs(4),
+                ["<C-Space>"] = cmp.mapping.complete(),
+                ["<C-e>"] = cmp.mapping.abort(),
+                ["<CR>"] = cmp.mapping.confirm({ select = true }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
+            }),
+            sources = cmp.config.sources({
+                { name = "nvim_lsp" },
+            },
+            {
+                { name = "buffer" },
+            })
+        })
+
+        -- Set configuration for specific filetype.
+        cmp.setup.filetype("gitcommit", {
+            sources = cmp.config.sources({
+                { name = "git" }, -- You can specify the `git` source if [you were installed it](https://github.com/petertriho/cmp-git).
+            }, {
+                    { name = "buffer" },
+                })
+        })
+
+        -- Use buffer source for `/` and `?` (if you enabled `native_menu`, this won't work anymore).
+        cmp.setup.cmdline({ "/", "?" }, {
+            mapping = cmp.mapping.preset.cmdline(),
+            sources = {
+                { name = "buffer" }
+            }
+        })
+
+        -- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
+        cmp.setup.cmdline(":", {
+            mapping = cmp.mapping.preset.cmdline(),
+            sources = cmp.config.sources({
+                { name = "path" }
+            }, {
+                    { name = "cmdline" }
+                }),
+            matching = { disallow_symbol_nonprefix_matching = false }
+        })
+
+    end,
+}