feat(lsp): add support to builtin document color

lua/lazyvim/config/keymaps.lua

@@ -161,6 +161,24 @@ if vim.lsp.inlay_hint then
   Snacks.toggle.inlay_hints():map("<leader>uh")
 end
 
+if vim.lsp.document_color then
+  if Snacks.toggle.document_color then
+    Snacks.toggle.document_color():map("<leader>uW") -- maybe other key?
+  else
+    -- TODO: remove this after the toggler is added to Snacks
+    Snacks.toggle.new({
+      id = "document_color",
+      name = "Document Color",
+      get = function()
+        return vim.lsp.document_color.is_enabled({ bufnr = 0 })
+      end,
+      set = function(state)
+        vim.lsp.document_color.enable(state, { bufnr = 0 })
+      end,
+    }):map("<leader>uW")
+  end
+end
+
 -- lazygit
 if vim.fn.executable("lazygit") == 1 then
   map("n", "<leader>gg", function() Snacks.lazygit( { cwd = LazyVim.root.git() }) end, { desc = "Lazygit (Root Dir)" })

lua/lazyvim/plugins/lsp/init.lua

@@ -46,6 +46,15 @@ return {
         codelens = {
           enabled = false,
         },
+        -- Enable this to enable the builtin LSP document color on Neovim.
+        -- Be aware that you also will need to properly configure your LSP server to
+        -- provide the document color.
+        ---@type vim.lsp.document_color.Opts|{enabled:boolean, exclude:string[]}
+        document_color = {
+          enabled = true,
+          exclude = {}, -- filetypes for which you don't want to enable document color
+          style = "background",
+        },
         -- Enable this to enable the builtin LSP folding on Neovim.
         -- Be aware that you also will need to properly configure your LSP server to
         -- provide the folds.
@@ -189,6 +198,26 @@ return {
         end)
       end
 
+      -- document color
+      if vim.fn.has("nvim-0.12") == 1 then
+        Snacks.util.lsp.on({ method = "textDocument/documentColor" }, function(buffer)
+          if vim.api.nvim_buf_is_valid(buffer) and vim.bo[buffer].buftype == "" then
+            -- The document color is enabled by default. To make our config work,
+            -- we need to disable it first and then re-enable it depending on our config.
+            -- We also pass the style to the function at this time,
+            -- which will be stored in a local variable and used when the document color is enabled.
+            vim.lsp.document_color.enable(false, { bufnr = buffer }, { style = opts.document_color.style })
+
+            if
+              opts.document_color.enabled
+              and not vim.tbl_contains(opts.document_color.exclude, vim.bo[buffer].filetype)
+            then
+              vim.lsp.document_color.enable(true, { bufnr = buffer })
+            end
+          end
+        end)
+      end
+
       -- folds
       if opts.folds.enabled then
         Snacks.util.lsp.on({ method = "textDocument/foldingRange" }, function()