Run command after each compile

Questions & Help Questions
,
1

How does one run a command automatically after compile/recompile completes? We generate graphql client based on absinthe output.

Are watchers the only way to accomplish this or is there a post compile hook?

2

Maybe something like this?

defmodule MySchema do
  @after_compile __MODULE__

  def __after_compile__(_env, _bytecode) do
    with {ret, 0} <- System.cmd("echo", ["graphql schema ready!"]) do
      IO.puts(ret)
    end
  end
end
3

Add task to compilers in your mix project

Something like

defmodule MyProject.MixProject do
  use Mix.Project
 
  def project do
    [
      ...
      compilers: Mix.compilers ++ [:graphql_client]
    ]
  end
end

This will call mix compile.graphql_client task

4

Does compilers guarantee any order amongst the compilers?

5

Yes, it is ordered in a list

6

In order for this to be efficient, I should add a check which compares hash of current inputs and prior inputs and only builds if inputs have changed. I can implement this, but I am curious if the manifests callback already helps with this problem?

7

Yeah, you should write your manifest file, then get it and compare the manifest with what you got

8

We tried this.the compilers seem to run when you use mix to invoke any alias