Specs

stream!([String.t(), ...],
  input: Enum.t() | collectable_func(),
  exit_timeout: timeout(),
  cd: String.t(),
  env: [{String.t(), String.t()}],
  log: boolean()
) :: ExCmd.Stream.t()

Runs the given command with arguments and return an Enumerable to read command output.

First parameter must be a list containing command with arguments. example: ["cat", "file.txt"].

optional

Optional

• input - Input can be binary, iodata, Enumerable (list, stream) or a function which accepts Collectable.

  • Binary

      # binary
      ExCmd.stream!(~w(base64), input: "Hello Wolrd")

  • Enumerable or iodata

    # list
    ExCmd.stream!(~w(base64), input: ["hello", "world"])
    
    # iodata
    ExCmd.stream!(~w(cat), input: ["He", ["llo"], [' ', ?W], ['or', "ld"]])
    
    # stream
    ExCmd.stream!(~w(cat), input: File.stream!("log.txt", [], 65536))

  • Collectable:

    If the input in a function with arity 1, ExCmd will call that function with a Collectable as the argument. The function must push input to this collectable. Return value of the function is ignored.

    ExCmd.stream!(~w(cat), input: fn sink ->
      Enum.into(1..100, sink, &to_string/1)
    end)

• exit_timeout - Time to wait for external program to exit. After writing all of the input we close the stdin stream and wait for external program to finish and exit. If program does not exit within exit_timeout an error will be raised and subsequently program will be killed in background. Defaults timeout is :infinity.

All other options are passed to ExCmd.Process.start_link/2

examples

Examples

ExCmd.stream!(~w(ffmpeg -i pipe:0 -f mp3 pipe:1), input: File.stream!("music_video.mkv", [], 65336))
|> Stream.into(File.stream!("music.mp3"))
|> Stream.run()

With input as binary

iex> ExCmd.stream!(~w(cat), input: "Hello World")
...> |> Enum.into("")
"Hello World"

iex> ExCmd.stream!(~w(base64), input: <<1, 2, 3, 4, 5>>)
...> |> Enum.into("")
"AQIDBAU=
"

With input as list

iex> ExCmd.stream!(~w(cat), input: ["Hello ", "World"])
...> |> Enum.into("")
"Hello World"

With input as iodata

iex> ExCmd.stream!(~w(base64), input: [<<1, 2,>>, [3], [<<4, 5>>]])
...> |> Enum.into("")
"AQIDBAU=
"

When program exit abnormally it will raise ExCmd.Stream.AbnormalExit error with exit_status.

iex> try do
...>   ExCmd.stream!(["sh", "-c", "exit 5"]) |> Enum.to_list()
...> rescue
...>   e in ExCmd.Stream.AbnormalExit ->
...>    e.exit_status
...> end
5