add: custom mason ensure installed

lua/user/utils/mason.lua

@@ -0,0 +1,56 @@
+local registry = require("mason-registry")
+
+local M = {}
+
+local function resolve_package(mason_package_name)
+  local Optional = require("mason-core.optional")
+
+  local ok, pkg = pcall(registry.get_package, mason_package_name)
+  if ok then
+    return Optional.of_nilable(pkg)
+  end
+end
+
+local function install_package(pkg, version)
+  local linter_name = pkg.name
+
+  vim.notify(("[mason-conform] installing %s"):format(linter_name))
+
+  return pkg:install({ version = version }):once(
+    "closed",
+    vim.schedule_wrap(function()
+      if pkg:is_installed() then
+        vim.notify(("[mason-conform] %s was successfully installed"):format(linter_name))
+      else
+        vim.notify(
+          ("[mason-conform] failed to install %s. Installation logs are available in :Mason and :MasonLog"):format(
+            linter_name
+          ),
+          vim.log.levels.ERROR
+        )
+      end
+    end)
+  )
+end
+
+function M.try_install(mason_package_name)
+  local Package = require("mason-core.package")
+  local package_name, version = Package.Parse(mason_package_name)
+
+  resolve_package(package_name)
+    :if_present(function(pkg)
+      if not pkg:is_installed() then
+        install_package(pkg, version)
+      end
+    end)
+    :if_not_present(function()
+      vim.notify(
+        ("[mason-conform] Formatter %q is not a valid entry in ensure_installed. Make sure to only provide valid formatter names."):format(
+          package_name
+        ),
+        vim.log.levels.WARN
+      )
+    end)
+end
+
+return M