feat(vim): style the completion better

This also keeps it a consistent width so it does not keep jumping
arround. We are also using nice nerd font icons without using `lspkind`

site-modules/core/files/vim/plugin/completion.lua

@@ -1,6 +1,33 @@
 local cmp = require'cmp'
 local luasnip = require'luasnip'
 
+local icons = {
+Text = "",
+    Method = "",
+    Function = "",
+    Constructor = "",
+    Field = "ﰠ",
+    Variable = "",
+    Class = "ﴯ",
+    Interface = "",
+    Module = "",
+    Property = "ﰠ",
+    Unit = "塞",
+    Value = "",
+    Enum = "",
+    Keyword = "",
+    Snippet = "",
+    Color = "",
+    File = "",
+    Reference = "",
+    Folder = "",
+    EnumMember = "",
+    Constant = "",
+    Struct = "פּ",
+    Event = "",
+    Operator = "",
+}
+
 local has_words_before = function()
   local line, col = unpack(vim.api.nvim_win_get_cursor(0))
   return col ~= 0 and vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match("%s") == nil
@@ -52,5 +79,28 @@ cmp.setup({
             luasnip.lsp_expand(args.body)
         end,
     },
+    window = {
+      completion = cmp.config.window.bordered(),
+      documentation = cmp.config.window.bordered(),
+    },
+    formatting = {
+      fields = {   'menu', 'abbr', 'kind' },
+      format = function(entry, vim_item)
+        -- Give the completion menu a consistent size to stop it jumping arround
+        local width = 34
+        if #vim_item.abbr > width then
+          vim_item.abbr = string.sub(vim_item.abbr, 1, width)
+        else
+          vim_item.abbr = vim_item.abbr .. string.rep(" ", width - #vim_item.abbr)
+        end
+
+        vim_item.menu = icons[vim_item.kind] or " "
+        vim_item.kind = "(" .. vim_item.kind .. ")"
+        return vim_item
+      end,
+    },
+    experimental = {
+      ghost_text = false,
+    },
 })