added colored indent lines

plugins/default.nix

@@ -24,9 +24,38 @@
     comment.enable = true;
     fugitive.enable = true;
     gitsigns.enable = true;
-    indent-blankline.enable = true;
+    indent-blankline = {
+      enable = true;
+      luaConfig.post = ''
+        local highlight = {
+            "RainbowRed",
+            "RainbowYellow",
+            "RainbowBlue",
+            "RainbowOrange",
+            "RainbowGreen",
+            "RainbowViolet",
+            "RainbowCyan",
+        }
+        local hooks = require "ibl.hooks"
+        -- create the highlight groups in the highlight setup hook, so they are reset
+        -- every time the colorscheme changes
+        hooks.register(hooks.type.HIGHLIGHT_SETUP, function()
+            vim.api.nvim_set_hl(0, "RainbowRed", { fg = "#E06C75" })
+            vim.api.nvim_set_hl(0, "RainbowYellow", { fg = "#E5C07B" })
+            vim.api.nvim_set_hl(0, "RainbowBlue", { fg = "#61AFEF" })
+            vim.api.nvim_set_hl(0, "RainbowOrange", { fg = "#D19A66" })
+            vim.api.nvim_set_hl(0, "RainbowGreen", { fg = "#98C379" })
+            vim.api.nvim_set_hl(0, "RainbowViolet", { fg = "#C678DD" })
+            vim.api.nvim_set_hl(0, "RainbowCyan", { fg = "#56B6C2" })
+        end)
+
+        vim.g.rainbow_delimiters = { highlight = highlight }
+        require("ibl").setup { scope = { highlight = highlight } }
+
+        hooks.register(hooks.type.SCOPE_HIGHLIGHT, hooks.builtin.scope_highlight_from_extmark)
+      '';
+    };
     lightline.enable = false;
-    # lsp-signature.enable = true;
     lualine.enable = true;
     nix.enable = true;
     noice.enable = true;