add support for overriding prefix (#3)

README.md

@@ -22,12 +22,6 @@ end
 
 Foreperson has 2 configuration options:
 
-`wait:`
-
-The amount of time to pause before finalizing startup.  This is useful if the configured process isn't instantly ready.
-For example, if your elixir app uses `ecto` and you want to use `foreperson` to start a `postgres` instance, you can set a
-wait time to ensure postgres is ready before `ecto` tries to connect.
-
 `processes:`
 
 A list of exertnal processes that you want to start.  The syntax is the similar to [Phoenix endpoint watchers](https://hexdocs.pm/phoenix/Phoenix.Endpoint.html#module-runtime-configuration).
@@ -36,10 +30,17 @@ followed by a keyword list of options.
 
 The available options are:
 - `:wrap`: Use a [zombie process wrapper](https://hexdocs.pm/elixir/master/Port.html#module-zombie-operating-system-processes). Defaults to `true`.
-- `:into`: Injects the result into the given collectable. Defaults to `Foreperson.stream(cmd)` where `cmd` is the name of the process.
+- `:prefix`: String added as prefix to the processes output.  Defaults to the key/command.
+- `:into`: Injects the result into the given collectable. Defaults to `Foreperson.stream(prefix)`.
 - `:stderr_to_stdout` - redirects stderr to stdout.  Defaults to `true`.
 - All the options available to [System.cmd/3](https://hexdocs.pm/elixir/System.html#cmd/3-options)
 
+`wait:`
+
+The amount of time to pause before finalizing startup.  This is useful if the configured process isn't instantly ready.
+For example, if your elixir app uses `ecto` and you want to use `foreperson` to start a `postgres` instance, you can set a
+wait time to ensure postgres is ready before `ecto` tries to connect.
+
 ### Example
 ```elixir
 config :foreperson,

lib/foreperson/formatter.ex

@@ -9,7 +9,7 @@ defmodule Foreperson.Formatter do
 
     defp into(formatter, prefix) do
       fn
-        :ok, {:cont, x} -> IO.write(:stdio, (prefix && "👷[#{prefix}] ") <> x)
+        :ok, {:cont, x} -> IO.write(:stdio, "👷[#{prefix}] " <> x)
         :ok, _ -> formatter
       end
     end

lib/foreperson/process.ex

@@ -19,7 +19,8 @@ defmodule Foreperson.Process do
   def run(cmd, args) when is_list(args) do
     {args, opts} = Enum.split_while(args, &is_binary(&1))
     {wrap, opts} = Keyword.pop(opts, :wrap, true)
-    opts = Keyword.merge([into: Foreperson.stream(cmd), stderr_to_stdout: true], opts)
+    {prefix, opts} = Keyword.pop(opts, :prefix, cmd)
+    opts = Keyword.merge([into: Foreperson.stream(prefix), stderr_to_stdout: true], opts)
 
     {args, cmd} =
       case wrap do

mix.exs

@@ -1,7 +1,7 @@
 defmodule Foreperson.MixProject do
   use Mix.Project
 
-  @version "0.1.3"
+  @version "0.1.4"
   @source_url "https://github.com/cschiewek/foreperson"
 
   def project do