Elixir v1.10.0 Inspect.Opts View Source

Defines the options used by the Inspect protocol.

The following fields are available:

  • :base - prints integers as :binary, :octal, :decimal, or :hex, defaults to :decimal. When inspecting binaries any :base other than :decimal implies binaries: :as_binaries.

  • :binaries - when :as_binaries all binaries will be printed in bit syntax.

    When :as_strings all binaries will be printed as strings, non-printable bytes will be escaped.

    When the default :infer, the binary will be printed as a string if it is printable, otherwise in bit syntax. See String.printable?/1 to learn when a string is printable.

  • :charlists - when :as_charlists all lists will be printed as charlists, non-printable elements will be escaped.

    When :as_lists all lists will be printed as lists.

    When the default :infer, the list will be printed as a charlist if it is printable, otherwise as list. See List.ascii_printable?/1 to learn when a charlist is printable.

  • :custom_options (since v1.9.0) - a keyword list storing custom user-defined options. Useful when implementing the Inspect protocol for nested structs to pass the custom options through.

  • :inspect_fun (since v1.9.0) - a function to build algebra documents, defaults to Inspect.inspect/2.

  • :limit - limits the number of items that are inspected for tuples, bitstrings, maps, lists and any other collection of items. It does not apply to printable strings nor printable charlists and defaults to 50. If you don't want to limit the number of items to a particular number, use :infinity.

  • :pretty - if set to true enables pretty printing, defaults to false.

  • :printable_limit - limits the number of characters that are inspected on printable strings and printable charlists. You can use String.printable?/1 and List.ascii_printable?/1 to check if a given string or charlist is printable. Defaults to 4096. If you don't want to limit the number of characters to a particular number, use :infinity.

  • :safe - when false, failures while inspecting structs will be raised as errors instead of being wrapped in the Inspect.Error exception. This is useful when debugging failures and crashes for custom inspect implementations.

  • :structs - when false, structs are not formatted by the inspect protocol, they are instead printed as maps, defaults to true.

  • :syntax_colors - when set to a keyword list of colors the output is colorized. The keys are types and the values are the colors to use for each type (for example, [number: :red, atom: :blue]). Types can include :atom, :binary, :boolean, :list, :map, :number, :regex, :string, and :tuple. Custom data types may provide their own options. Colors can be any IO.ANSI.ansidata/0 as accepted by IO.ANSI.format/1.

  • :width - defaults to 80 characters, used when pretty is true or when printing to IO devices. Set to 0 to force each item to be printed on its own line. If you don't want to limit the number of items to a particular number, use :infinity.

Link to this section Summary

Link to this section Types


color_key() :: atom()


t() :: %Inspect.Opts{
  base: :decimal | :binary | :hex | :octal,
  binaries: :infer | :as_binaries | :as_strings,
  char_lists: :infer | :as_lists | :as_char_lists,
  charlists: :infer | :as_lists | :as_charlists,
  custom_options: keyword(),
  inspect_fun: (any(), t() -> Inspect.Algebra.t()),
  limit: pos_integer() | :infinity,
  pretty: boolean(),
  printable_limit: pos_integer() | :infinity,
  safe: boolean(),
  structs: boolean(),
  syntax_colors: [{color_key(), IO.ANSI.ansidata()}],
  width: pos_integer() | :infinity