Get path data from config vars

lib/mix/tasks/pandoc.ex

@@ -1,16 +1,38 @@
 defmodule Mix.Tasks.Pandoc do
   use Mix.Task
 
-  @out_dir "priv/static"
-
   @impl true
-  def run([profile | _args]) do
-    IO.puts "profile: #{profile}"
+  def run(args) do
+    switches = [runtime_config: :boolean]
+    {opts, remaining_args} = OptionParser.parse_head!(args, switches: switches)
 
-    "priv/posts"
+    if opts[:runtime_config] do
+      Mix.Task.run("app.config")
+    else
+      Mix.Task.run("loadpaths")
+      Application.ensure_all_started(:pandoc)
+    end
+
+    Mix.Task.reenable("pandoc")
+    install_and_run(remaining_args)
+  end
+
+  defp install_and_run([profile | args] = _all) do
+    IO.puts("mix task args #{inspect(args)}")
+
+    "documents"
     |> File.ls!()
     |> Enum.each(fn path ->
-      Pandoc.install_and_run(Path.join(["priv", "posts", path]))
+      all = [profile, path]
+
+      case Pandoc.run(String.to_atom(profile), [path]) do
+        0 -> :ok
+        status -> Mix.raise("`mix pandoc #{Enum.join(all, " ")}` exited with #{status}")
+      end
     end)
   end
+
+  defp install_and_run([]) do
+    Mix.raise("`mix pandoc` expects the profile as argument")
+  end
 end

lib/pandoc.ex

@@ -3,32 +3,16 @@ defmodule Pandoc do
   Documentation for `Pandoc`.
   """
 
-  def install_and_run(path) do
-    System.cmd("pandoc", [
-      "--mathjax",
-      path,
-      "-o",
-      Path.join(
-        "priv/static/posts",
-        Path.basename(path)
-        |> String.replace_suffix(".md", ".html")
-        |> String.slice(11..-1//1)
-      )
-    ])
-  end
+  def run(profile, ["--watch"]) do
+    IO.puts("""
 
-  def install_and_run(profile, ["--watch"]) do
-    # Application.get_env(:pandoc, a1) |> inspect(pretty: true) |> IO.puts
-    IO.puts(
-      "Pandoc watcher starting, env: #{Application.get_env(:pandoc, profile) |> inspect(pretty: true)}"
-    )
-
-    # Application.get_env(:pandoc, profile) |> inspect(pretty: true) |> IO.puts()
+    Pandoc watcher starting, env: #{Application.get_env(:pandoc, profile) |> inspect(pretty: true)}
+    """)
 
     ref =
       __MODULE__.Supervisor
       |> Supervisor.start_child(
-        Supervisor.child_spec({Pandoc.Watcher, [profile, dirs: ["priv/posts"]]},
+        Supervisor.child_spec({Pandoc.Watcher, [profile, dirs: ["documents"]]},
           restart: :transient,
           id: __MODULE__.Watcher
         )
@@ -43,4 +27,34 @@ defmodule Pandoc do
       {:DOWN, ^ref, _, _, _} -> :ok
     end
   end
+
+  def run(profile, extra_args) do
+    config = Application.get_env(:pandoc, profile)
+    args = config[:args] || []
+
+    opts = [
+      cd: config[:cd] || File.cwd!(),
+      into: IO.stream(:stdio, :line),
+      stderr_to_stdout: true
+    ]
+
+    [path] = extra_args
+
+    args =
+      List.update_at(args, -1, fn v ->
+        Path.join(
+          v,
+          path
+          |> Path.basename()
+          |> String.replace_suffix(".md", ".html")
+          |> String.slice(11..-1//1)
+        )
+      end)
+
+    IO.puts("""
+    System command running: #{inspect(Enum.join(["pandoc" | args ++ extra_args], " "))}
+    """)
+
+    "pandoc" |> System.cmd(args ++ extra_args, opts) |> elem(1)
+  end
 end

lib/pandoc/application.ex

@@ -6,15 +6,10 @@ defmodule Pandoc.Application do
   use Application
 
   @impl true
-  def start(type, args) do
-    IO.puts("*********************************************")
-    IO.puts("#{inspect(type)} #{inspect(args)}")
-    # Application.get_env(:pandoc, profile)
-
+  def start(_type, _args) do
     children = [
       # Starts a worker by calling: Pandoc.Worker.start_link(arg)
       # {Pandoc.Worker, arg}
-      # {Pandoc, dirs: ["priv/posts"]}
     ]
 
     # See https://hexdocs.pm/elixir/Supervisor.html

lib/pandoc/watcher.ex

@@ -1,25 +1,21 @@
 defmodule Pandoc.Watcher do
   use GenServer
 
+  @ext ".md"
+
   def start_link(args) do
     GenServer.start_link(__MODULE__, args)
   end
 
   def init([profile | args]) do
-    IO.puts("pandoc filesystem watcher init args #{inspect(args)}")
-
-    IO.puts(
-      "Application.get_env(:pandoc, :#{profile}): #{inspect(Application.get_env(:pandoc, profile))}"
-    )
-
     {:ok, watcher_pid} = FileSystem.start_link(args)
     FileSystem.subscribe(watcher_pid)
-    {:ok, %{watcher_pid: watcher_pid}}
+    {:ok, %{watcher_pid: watcher_pid, profile: profile}}
   end
 
   def handle_info({:file_event, watcher_pid, {path, events}}, %{watcher_pid: watcher_pid} = state) do
     case {Path.extname(path), :closed in events} do
-      {".md", true} -> Pandoc.run(path)
+      {@ext, true} -> Pandoc.run(state[:profile], [path])
       _ -> nil
     end