neovim/lua/plugins/lsp/mason.lua

-- Install and configure mason.nvim which will install automatically the needed
-- LSP

return {
  "williamboman/mason.nvim",
  dependencies = {
    "williamboman/mason-lspconfig.nvim",
    "WhoIsSethDaniel/mason-tool-installer.nvim",
  },
  config = function()
    -- Import mason
    local mason = require("mason")

    -- Import mason-lspconfig
    local mason_lspconfig = require("mason-lspconfig")

    -- Import lspconfig
    local lspconfig = require("lspconfig")

    local util = require("lspconfig.util")

    -- Import mason-tool-installer 
    local mason_tool_installer = require("mason-tool-installer")

    -- Activate mason and set icones
    mason.setup({
      ui = {
        icons = {
          package_installed = "✓",
          package_pending = "➜",
          package_uninstalled = "✗",
        },
      },
    })

    mason_tool_installer.setup({
      ensure_installed = {
        "black",
        "isort",
        "prettier",
        "stylua",
        "tree-sitter-cli",
      }
    })

    mason_lspconfig.setup({
      -- LSP to be installed by default
      -- Available LSP: https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md
      -- LSP can be installed with :Mason
      -- But installing LSP through the following list is better
      ensure_installed = {
        "cssls",
        "html",
        "jsonls",
        "lua_ls",
        "marksman",
        "pylsp",
        "yamlls",
      },
      handlers = {
        -- Function called for each LSP from the ensure_installed list loaded
        function(server_name)
          -- Activate all LSP from the ensure_installed list with its default
          -- configuration
          lspconfig[server_name].setup({})
        end,

        -- Then, configure each LSP as needed
        --  See https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md
        --
        -- To deactivate a LSP:
        -- lsp_name = require("lsp-zero").noop,

        -- The LSP name before`= function()` has to be the same than after
        --  `lspconfig.`
        -- The first one is the mason_lspconfig key, the seconde one is the
        --  lspconfig key. They are identical to the ensure_installed entries.

        -- https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md#pylsp
        pylsp = function()
          lspconfig.pylsp.setup({
            settings = {
              pylsp = {
                plugins = {
                  pyflakes = { enabled = false },
                  pycodestyle = {
                    enabled = true,
                    ignore = { "E501" },
                  },
                },
              },
            },
          })
        end,

        lua_ls = function()
          lspconfig.lua_ls.setup({
            settings = {
              Lua = {
                diagnostics = {
                  -- Force LSP to recognize global variable `vim`.
                  globals = { "vim" },
                  disable = { "missing-fields" },
                }
              }
            }
          })
        end,

        jsonls = function()
            lspconfig.jsonls.setup({
              settings = {
                json = {
                  schemas = require("schemastore").json.schemas(),
                  validate = { enable = true },
                }
              }
            })
        end,

        marksman = function()
          lspconfig.marksman.setup({
            setting = {
              filetypes = {
                "markdown",
                "quarto",
              },
            root_dir = util.root_pattern(
              '.git',
              '.marksman.toml',
              '_quarto.yml'
              ),
            }
          })
        end
      },
    })
  end,
}