StringIO.open

You're seeing just the function open, go back to StringIO module for more information.
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open(string, options_or_function \\ [])

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Specs

open(binary(), keyword()) :: {:ok, pid()}
open(binary(), (pid() -> res)) :: {:ok, res} when res: var

Creates an IO device.

string will be the initial input of the newly created device.

options_or_function can be a keyword list of options or a function.

If options are provided, the result will be {:ok, pid}, returning the IO device created. The option :capture_prompt, when set to true, causes prompts (which are specified as arguments to IO.get* functions) to be included in the device's output.

If a function is provided, the device will be created and sent to the function. When the function returns, the device will be closed. The final result will be a tuple with :ok and the result of the function.

Examples

iex> {:ok, pid} = StringIO.open("foo")
iex> IO.gets(pid, ">")
"foo"
iex> StringIO.contents(pid)
{"", ""}

iex> {:ok, pid} = StringIO.open("foo", capture_prompt: true)
iex> IO.gets(pid, ">")
"foo"
iex> StringIO.contents(pid)
{"", ">"}

iex> StringIO.open("foo", fn pid ->
...>   input = IO.gets(pid, ">")
...>   IO.write(pid, "The input was #{input}")
...>   StringIO.contents(pid)
...> end)
{:ok, {"", "The input was foo"}}
Link to this function

open(string, options, function)

View Source (since 1.7.0)

Specs

open(binary(), keyword(), (pid() -> res)) :: {:ok, res} when res: var

Creates an IO device.

string will be the initial input of the newly created device.

The device will be created and sent to the function given. When the function returns, the device will be closed. The final result will be a tuple with :ok and the result of the function.

Options

  • :capture_prompt - if set to true, prompts (specified as arguments to IO.get* functions) are captured in the output. Defaults to false.

  • :encoding (since v1.10.0) - encoding of the IO device. Allowed values are :unicode (default) and :latin1.

Examples

iex> StringIO.open("foo", [], fn pid ->
...>   input = IO.gets(pid, ">")
...>   IO.write(pid, "The input was #{input}")
...>   StringIO.contents(pid)
...> end)
{:ok, {"", "The input was foo"}}

iex> StringIO.open("foo", [capture_prompt: true], fn pid ->
...>   input = IO.gets(pid, ">")
...>   IO.write(pid, "The input was #{input}")
...>   StringIO.contents(pid)
...> end)
{:ok, {"", ">The input was foo"}}