markdown: tools and config override

- Add markdown and markdown_inline Treesitter parsers
- Add marksman language server

Configure null-ls to use Practicalli .markdownlint.yaml configuration
with more subtle rules configuration

Author: practicalli-johnny

plugins/mason.lua

@@ -7,7 +7,8 @@ return {
     opts = function(_, opts)
       -- add more things to the ensure_installed table protecting against community packs modifying it
       opts.ensure_installed = require("astronvim.utils").list_insert_unique(opts.ensure_installed, {
-        "marksman", -- Markdown structure
+        -- `community.lua` ensures language servers via their language packs
+        "marksman", -- Markdown structure (also in markdown pack)
         "yamlls",
       })
     end,
@@ -19,9 +20,10 @@ return {
     opts = function(_, opts)
       -- add more things to the ensure_installed table protecting against community packs modifying it
       opts.ensure_installed = require("astronvim.utils").list_insert_unique(opts.ensure_installed, {
-        -- "prettier",
-        "alex",         -- neutral language lint
-        "markdownlint", -- markdown lint & format
+        -- `community.lua` ensures lint and format tools via their language packs
+        -- "prettier", -- too agressive
+        "alex", -- neutral language lint
+        "markdownlint", -- markdown lint & format (not in markdown pack)
       })
     end,
   },

plugins/null-ls.lua

@@ -2,7 +2,7 @@ return {
   "jose-elias-alvarez/null-ls.nvim",
   opts = function(_, config)
     -- config variable is the default configuration table for the setup function call
-    -- local null_ls = require "null-ls"
+    local null_ls = require "null-ls"
 
     -- Check supported formatters and linters
     -- https://github.com/jose-elias-alvarez/null-ls.nvim/tree/main/lua/null-ls/builtins/formatting
@@ -11,6 +11,14 @@ return {
       -- Set a formatter
       -- null_ls.builtins.formatting.stylua,
       -- null_ls.builtins.formatting.prettier,
+
+      null_ls.builtins.formatting.markdownlint.with {
+        -- pass arguments to modify/override the null-ls builtin configuration
+        args = {
+          "--config ",
+          "/home/practicalli/.markdownlint.yaml",
+        },
+      },
     }
     return config -- return final config table
   end,