feat: Add markdown.nvim integration (#740)

* feat: Add markdown.nvim integration

* fix: option order

* fix: Use `render-markdown` name in README

README.md

@@ -1326,6 +1326,20 @@ To use another flavour just replace `mocha` with the one you want to use.
 </tr>
 <!-- reactive.nvim -->
 
+<!-- markdown.nvim -->
+</tr>
+<tr>
+<td> <a href="https://github.com/MeanderingProgrammer/markdown.nvim">render-markdown (markdown.nvim)</a> </td>
+<td>
+
+```lua
+render_markdown = true
+```
+
+</td>
+</tr>
+<!-- markdown.nvim -->
+
 <!-- symbols-outline.nvim -->
 </tr>
 <tr>

lua/catppuccin/groups/integrations/render_markdown.lua

@@ -0,0 +1,27 @@
+local M = {}
+
+-- markdown.nvim highlight groups:
+-- https://github.com/MeanderingProgrammer/markdown.nvim?tab=readme-ov-file#colors
+
+function M.get()
+	local groups = {
+		RenderMarkdownCode = { bg = C.surface0 },
+		RenderMarkdownCodeInline = { bg = C.surface1 },
+		RenderMarkdownBullet = { fg = C.sky },
+		RenderMarkdownTableHead = { fg = C.blue },
+		RenderMarkdownTableRow = { fg = C.lavender },
+	}
+
+	local syntax = require("catppuccin.groups.syntax").get()
+	local base = not O.transparent_background and C.base or nil
+
+	for i = 1, 6 do
+		local color = syntax["rainbow" .. i].fg
+		groups["RenderMarkdownH" .. i] = { fg = color }
+		groups["RenderMarkdownH" .. i .. "Bg"] = { bg = U.darken(color, 0.30, base) }
+	end
+
+	return groups
+end
+
+return M

lua/catppuccin/init.lua

@@ -52,6 +52,7 @@ local M = {
 			nvimtree = true,
 			ufo = true,
 			rainbow_delimiters = true,
+			render_markdown = true,
 			semantic_tokens = not is_vim,
 			telescope = { enabled = true },
 			treesitter = not is_vim,

lua/catppuccin/types.lua

@@ -192,6 +192,7 @@
 ---@field overseer boolean?
 ---@field pounce boolean?
 ---@field rainbow_delimiters boolean?
+---@field render_markdown boolean?
 ---@field sandwich boolean?
 ---@field semantic_tokens boolean?
 ---@field symbols_outline boolean?