How to run mix format from a mix release?

Fubuchi · February 15, 2023, 6:50am

I am trying to run mix format inside my code and using elixir-ls code as a reference:

elixir-lsp/elixir-ls/blob/v0.13.0/apps/language_server/lib/language_server/source_file.ex#L237


      
          
          
  """
          
          
  ```
            #{spec_str}
            ```
            """
          end
          
          
@spec formatter_for(String.t()) :: {:ok, {function | nil, keyword()}} | :error
          def formatter_for(uri = "file:" <> _) do
            path = __MODULE__.Path.from_uri(uri)
          
          
  try do
              true = Code.ensure_loaded?(Mix.Tasks.Format)
          
          
    if Version.match?(System.version(), ">= 1.13.0") do
                {:ok, apply(Mix.Tasks.Format, :formatter_for_file, [path])}
              else
                {:ok, {nil, apply(Mix.Tasks.Format, :formatter_opts_for_file, [path])}}
              end

I created a new project, added :mix to extra_applications to be able to to use mix in a release. The problem is when I try to format a file in a phoenix project using phoenix plugin, it will said that plugin Phoenix.LiveView.HTMLFormatter was not loaded. I was able to solve this issue by loading all the beam file in the project that I want to format to my release code at runtime. But the .formatter.exs in a phoenix project also have an import_deps section, the mix format also checked for deps, but my release code do not have these deps and I could not find a way to solve this issue.

How can I correctly use mix format inside elixir code like elixir-ls?

Actually, any suggestion for what I am trying to do are welcome, I am trying to build a formatting service back end for my vscode extension, I could use mix format directly, but the vm spin up time make it took more than 1 second to format a simple file, so I thought running a back end upfront may help reduce the time.