feat(nord-nvim): add interoperability with headlines and bufferline

lua/astrocommunity/colorscheme/nord-nvim/README.md

@@ -3,48 +3,3 @@
 **Repository:** <https://github.com/shaunsingh/nord.nvim>
 
 Neovim theme based off of the Nord Color Palette, written in lua with treesitter support
-
-## Customization
-
-To support [headlines](https://github.com/lukas-reineke/headlines.nvim), you should add this code to your config:
-
-```lua
-local utils = require("astronvim.utils")
-{
-  "lukas-reineke/headlines.nvim",
-  opts = function(_, opts)
-    if not opts.markdown then opts.markdown = {} end
-    opts.markdown.headline_highlights = utils.list_insert_unique(opts.markdown.headline_highlights, {
-      "Headline1",
-      "Headline2",
-      "Headline3",
-      "Headline4",
-      "Headline5",
-      "Headline6",
-    })
-    opts.markdown.codeblock_highlight = "CodeBlock"
-    opts.markdown.dash_highlight = "Dash"
-    opts.markdown.quote_highlight = "Quote"
-  end,
-},
-
-```
-
-To support [BufferLine](https://github.com/akinsho/nvim-bufferline.lua), you can add this code to your config:
-
-```lua
-{
-  "akinsho/bufferline.nvim",
-  opts = function(_, opts)
-    if not opts.options then opts.options = {} end
-    opts.options.seperator_style = "thin"
-
-    local highlights = require("nord").bufferline.highlights({
-      italic = true,
-      bold = true,
-    })
-
-    opts.highlights = highlights
-  end,
-}
-```

lua/astrocommunity/colorscheme/nord-nvim/nord.lua

@@ -1,11 +1,39 @@
 return {
-  "shaunsingh/nord.nvim",
-  init = function()
-    vim.g.nord_contrast = true
-    vim.g.nord_borders = false
-    vim.g.nord_disable_background = false
-    vim.g.nord_italic = false
-    vim.g.nord_uniform_diff_background = true
-    vim.g.nord_bold = false
-  end,
+  {
+    "shaunsingh/nord.nvim",
+    init = function()
+      vim.g.nord_contrast = true
+      vim.g.nord_borders = false
+      vim.g.nord_disable_background = false
+      vim.g.nord_italic = false
+      vim.g.nord_uniform_diff_background = true
+      vim.g.nord_bold = false
+    end,
+  },
+  {
+    "lukas-reineke/headlines.nvim",
+    optional = true,
+    opts = {
+      markdown = {
+        headline_highlights = {
+          "Headline1",
+          "Headline2",
+          "Headline3",
+          "Headline4",
+          "Headline5",
+          "Headline6",
+        },
+      },
+    },
+  },
+  {
+    "akinsho/bufferline.nvim",
+    optional = true,
+    opts = function(_, opts)
+      return require("astronvim.utils").extend_tbl(opts, {
+        highlights = require("nord").bufferline.highlights { italic = true, bold = true },
+        options = { separator_style = "thin" },
+      })
+    end,
+  },
 }