feature(compiler tracers): Add tracing code.

lib/ex_factor/server.ex

@@ -0,0 +1,21 @@
+defmodule ExFactor.Server do
+  use Agent
+
+  def start_link(_module) do
+    Agent.start_link(fn -> %{module: __MODULE__, entries: %{}} end, name: __MODULE__)
+  end
+
+  def record(type, file, line, column, module, name, arity, _context_modules, caller_module) do
+    Agent.update(__MODULE__, fn state ->
+      entry = {type, line, column, module, name, arity}
+
+      Map.update!(state, :entries, fn entries ->
+        Map.update(entries, {file, caller_module}, [entry], &[entry | &1])
+      end)
+    end)
+  end
+
+  def entries() do
+    Agent.get(__MODULE__, & &1.entries)
+  end
+end

mix.exs

@@ -1,22 +1,22 @@
 defmodule ExFactor.Tracer do
   @trace_types ~w(import imported_function alias alias_expansion alias_reference require struct_expansion remote_function local_function)a
   def trace({type, meta, module, name, arity}, env)  when type in @trace_types do
-    content = """
-    ExFactor.Tracer mix.exs
-    type: #{type}
-    meta: #{inspect(meta)}
-    traced_module: #{module}
-    name: #{name}
-    arity: #{arity}
-    filepath: #{env.file}
-    context_modules: #{inspect(env.context_modules)}
-    caller_module: #{env.module}
-    >>>>>>>>>>>>>>>>>>>>VVVVVVVVV<<<<<<<<<<<<<<<<<<<<<
+    ExFactor.Server.record(type, env.file, meta[:line], meta[:column], module, name, arity, env.context_modules, env.module)
+    # content = """
+    # ExFactor.Tracer mix.exs
+    # type: #{type}
+    # meta: #{inspect(meta)}
+    # traced_module: #{module}
+    # name: #{name}
+    # arity: #{inspect(arity)}
+    # filepath: #{env.file}
+    # context_modules: #{inspect(env.context_modules)}
+    # caller_module: #{env.module}
 
-    """
-    File.mkdir_p!("./tmp")
-    File.touch!("./tmp/traces")
-    File.write!("./tmp/traces", content, [:append])
+    # """
+    # File.mkdir_p!("./tmp")
+    # File.touch!("./tmp/traces")
+    # File.write!("./tmp/traces", content, [:append])
     :ok
   end