docs: add section to adjust cmp label and menu length (#165)

* feat: add section to adjust cmp label and menu length

* chore: modify menu item only if it exists

Co-authored-by: Micah Halter <[email protected]>

* chore: close code block

* refactor: extract truncate logic

Co-authored-by: Micah Halter <[email protected]>

---------

Co-authored-by: Micah Halter <[email protected]>

Author: azdanov

src/content/docs/recipes/cmp.mdx

@@ -143,3 +143,33 @@ return { -- override nvim-cmp plugin
   end,
 }
 ```
+
+### Limit Label and Menu Item Length
+
+To limit the label and menu item length and prevent the documentation window from getting too small, you can use the following configuration:
+
+```lua title="lua/plugins/cmp.lua"
+return {
+  "hrsh7th/nvim-cmp",
+  opts = function(_, opts)
+    local astrocore, astroui = require "astrocore", require "astroui"
+    local function truncate(str, len)
+      if not str then return end
+      local truncated = vim.fn.strcharpart(str, 0, len)
+      return truncated == str and str or truncated .. astroui.get_icon "Ellipsis"
+    end
+
+    if not opts.formatting then opts.formatting = {} end
+    opts.formatting.format = astrocore.patch_func(opts.formatting.format, function(format, ...)
+      -- get item from original formatting function
+      local vim_item = format(...)
+
+      -- truncate text fields to maximum of 25% of the window
+      vim_item.abbr = truncate(vim_item.abbr, math.floor(0.25 * vim.o.columns))
+      vim_item.menu = truncate(vim_item.menu, math.floor(0.25 * vim.o.columns))
+
+      return vim_item
+    end)
+  end,
+}
+```