How would I be able to check the category of a package ?

[punowo]

local M = {}
local vim = vim
local lspconfig = require("lspconfig")
require("mason").setup()
require("mason-lspconfig").setup({})
require("mason-tool-installer").setup({
  ensure_installed = {'bash-language-server', 'shfmt', 'lua-language-server', 'stylua'},
  auto_update = true
})
local Pkg = require("mason-core.package")
local mason_registry = require("mason-registry")
local null_ls = require("null-ls")

local default_lsp_on_attach = function(client)
require("mappings").keys_lsp()
client.resolved_capabilities.document_formatting = false
client.resolved_capabilities.document_range_formatting = false
end
local default_lsp_capabilities = require("cmp_nvim_lsp").update_capabilities(vim.lsp.protocol.make_client_capabilities

lspconfig.util.default_config = vim.tbl_extend("force", lspconfig.util.default_config, {
on_attach = default_lsp_on_attach,
capabilities = default_lsp_capabilities,
})

function M.setup_default()
require("mason-lspconfig").setup_handlers({
  function(server_name)
    lspconfig[server_name].setup({
    })
    end,
    ["sumneko_lua"] = function()
    lspconfig.sumneko_lua.setup({
      settings = {
        Lua = {
          runtime = {
            version = "LuaJIT",
          },
          diagnostics = {
            globals = { "vim", "use", "require" },
          },
          workspace = {
            library = vim.api.nvim_get_runtime_file("", true),
          },
          telemetry = {
            enable = false,
          },
        },
      },
    })
    end,
  })

  local null_sources = {}
  for _, package in ipairs(mason_registry.get_installed_packages()) do
    local config = { command = package:get_install_path() }
    if package.categories == { Pkg.Cat.Formatter} then
      print(package.name)
      print(package:get_install_path())
      table.insert(null_sources, null_ls.builtins.formatting[package.name].with(config))
    end
  end
  null_ls.setup({
    sources = null_sources,
    on_attach = function(client)
    if client.resolved_capabilities.document_formatting then
      vim.cmd([[
      augroup LspFormatting
      autocmd! * <buffer>
      autocmd BufWritePre <buffer> lua vim.lsp.buf.formatting_sync()
      augroup END
      ]])
    end
    end,
  })

end

return M

I'm posting the whole file for context but what I'm really interested in is this piece.

 local null_sources = {}
      for _, package in ipairs(mason_registry.get_installed_packages()) do
          local config = { command = package:get_install_path() }
          if package.categories == { Pkg.Cat.Formatter} then
              print(package.name)
              print(package:get_install_path())
              table.insert(null_sources, null_ls.builtins.formatting[package.name].with(config))
          end
      end

I choose not to go with the source_map solution that was posted by williamboman in another discussion because I need to pass the package command to the null_ls builtin and this has to be done after get_installed_packages()

What I'm trying to do is loop over all installed packages and for certain categories insert them into null_sources using the null_ls builtin related to that category.

[williamboman]

Hello! You can access the categories of a package via its spec field, which is of type PackageSpec.

[williamboman]

Also I noticed a potential problem in your script. package:get_install_path() will return the full path to the directory in which the package is installed. If you're interested in an executable provided by a package, you should look in the ${MASON_INSTALL_DIR}/.bin directory. This .bin directory is automatically added to PATH when you call require("mason").setup(), so you should really never have to manually construct full paths to an executable - canonical names should suffice (stylua, shfmt).

[punowo]

Also I noticed a potential problem in your script. package:get_install_path() will return the full path to the directory in which the package is installed. If you're interested in an executable provided by a package, you should look in the ${MASON_INSTALL_DIR}/.bin directory. This .bin directory is automatically added to PATH when you call require("mason").setup(), so you should really never have to manually construct full paths to an executable - canonical names should suffice (stylua, shfmt).

Thank you for the explanation. I was not aware of this and trying to replicate the way things were already done with formatter-installer.

[punowo]

local M = {}
  -- selene: allow(undefined_variable)
  ---@diagnostic disable-next-line
  local vim = vim
  local util = require("util")
  local lspconfig = require("lspconfig")
  local mason_package = require("mason-core.package")
  local mason_registry = require("mason-registry")
  local null_ls = require("null-ls")
  require("mason").setup()
  require("mason-lspconfig").setup({})
  require("mason-tool-installer").setup({
      ensure_installed = { "bash-language-server", "shellcheck", "shfmt", "lua-language-server", "stylua" },
      auto_update = true,
  })

  local default_lsp_on_attach = function(client)
      require("mappings").keys_lsp()
      client.resolved_capabilities.document_formatting = false
      client.resolved_capabilities.document_range_formatting = false
  end
  local default_lsp_capabilities =
      require("cmp_nvim_lsp").update_capabilities(vim.lsp.protocol.make_client_capabilities())

  lspconfig.util.default_config = vim.tbl_extend("force", lspconfig.util.default_config, {
      on_attach = default_lsp_on_attach,
      capabilities = default_lsp_capabilities,
  })

  function M.setup_default()
      require("mason-lspconfig").setup_handlers({
          function(server_name)
              lspconfig[server_name].setup({})
          end,

          ["sumneko_lua"] = function()
              lspconfig.sumneko_lua.setup({
                  Lua = {
                      runtime = {
                          version = "LuaJIT",
                      },
                      diagnostics = {
                          globals = { "vim" },
                      },
                      workspace = {
                          library = vim.api.nvim_get_runtime_file("", true),
                      },
                      telemetry = {
                          enable = false,
                      },
                  },
              })
          end,
      })
   local null_sources = {}
      table.insert(null_sources, null_ls.builtins.diagnostics.selene) -- lua
      for _, package in ipairs(mason_registry.get_installed_packages()) do
          if util.set_contains_val(package.spec.categories, mason_package.Cat.Formatter) then
              table.insert(null_sources, null_ls.builtins.formatting[package.name])
          end
          if util.set_contains_val(package.spec.categories, mason_package.Cat.Linter) then
              table.insert(null_sources, null_ls.builtins.diagnostics[package.name])
          end
      end

      local augroup = vim.api.nvim_create_augroup("LspFormatting", {})
      null_ls.setup({
          sources = null_sources,
          on_attach = function(client, bufnr)
              if client.supports_method("textDocument/formatting") then
                  vim.api.nvim_clear_autocmds({ group = augroup, buffer = bufnr })
                  vim.api.nvim_create_autocmd("BufWritePre", {
                      group = augroup,
                      buffer = bufnr,
                      callback = function()
                          vim.lsp.buf.formatting_sync()
                      end,
                  })
              end
          end,
      })
  end

  return M

Posting the end result. The following configuration might result in error in case null-ls doesn't have a BUILTIN for that package.

There is currently a bug that happens when you use this config where bashls immediately exists and points to this throw in linter.js but I'm not aware if this is because of mason.nvim or bad configuration on my part.

https://github.com/bash-lsp/bash-language-server/blob/58fc27552ea1ae6071097d88dbec14690d9503bb/server/src/linter.ts#L100

try {
    exit = yield proc;
} catch (e) {
    if (e.code === 'ENOENT') {
        // shellcheck path wasn't found, don't try to lint any more:
        console.error(`shellcheck not available at path '${this.executablePath}'`);
        this._canLint = false;
        return {
            comments: []
        };
    }
    throw new Error(`shellcheck failed with code ${exit}: ${e}\nout:\n${out}\nerr:\n${err}`);
}           

Found it. I'm on a M1.

~/.local/share/nvim/mason/bin
❯ ./shellcheck --help
zsh: bad CPU type in executable: ./shellcheck

There don't seem to be any publicly available builds outside homebrew...