shell_docs(3)

NAME
shell_docs - Functions used to render EEP-48 style documentation for a shell.

DESCRIPTION

This module can be used to render function and type documentation to be printed in a shell. This is the module that is used to render the docs accessed through the shell through c:h/1,2,3. Example:

1> h(maps,new,0).
  -spec new() -> Map when Map :: #{}.
Since:
  OTP 17.0
  Returns a new empty map.
  Example:
    > maps:new().
    #{}

This module formats and renders EEP-48 documentation of the format application/erlang+html. For more information about this format see Documentation Storage in Erl_Docgen's User's Guide. It can also render any other format of "text" type, although those will be rendered as is.

DATA TYPES
docs_v1() = #docs_v1{}

    The record holding EEP-48 documentation for a module. You can use code:get_doc/1 to fetch this information from a module.
config() =
    #{encoding => unicode | latin1,
      columns => integer() >= 1,
      ansi => boolean()}

    The configuration of how the documentation should be rendered.

        encoding:
             Configure the encoding that should be used by the renderer for graphical details such as bullet-points. By default shell_docs uses the value returned by io:getopts().

        ansi:
             Configure whether ansi escape codes should be used to render graphical details such as bold and underscore. By default shell_docs will try to determine if the receiving shell supports ansi escape codes. It is possible to override the automated check by setting the kernel configuration parameter shell_docs_ansi to a boolean() value.

        columns:
             Configure how wide the target documentation should be rendered. By default shell_docs used the value returned by io:columns().
chunk_element_block_type() =
    p | 'div' | br | pre | ul | ol | li | dl | dt | dd | h1 | h2 |
    h3 | h4 | h5 | h6
chunk_element_inline_type() = a | code | em | strong | i | b
chunk_element_type() =
    chunk_element_inline_type() | chunk_element_block_type()

    The HTML tags allowed in application/erlang+html.
chunk_element_attr() = {atom(), unicode:chardata()}
chunk_element_attrs() = [chunk_element_attr()]
chunk_element() =
    {chunk_element_type(),
     chunk_element_attrs(),
     chunk_elements()} |
    binary()
chunk_elements() = [chunk_element()]

EXPORTS

render(Module, Docs) -> unicode:chardata()
render(Module, Docs, Config) -> unicode:chardata()
render(Module, Function, Docs) -> Res
render(Module, Function, Docs, Config) -> Res
render(Module, Function, Arity, Docs) -> Res
render(Module, Function, Arity, Docs, Config) -> Res

    Types:
        Module = module()
        Function = atom()
        Arity = arity()
        Docs = docs_v1()
        Config = config()
        Res = unicode:chardata() | {error, function_missing}

    Render the documentation for a module or function.

render_type(Module, Docs) -> unicode:chardata()
render_type(Module, Docs, Config) -> unicode:chardata()
render_type(Module, Type, Docs) -> Res
render_type(Module, Type, Docs, Config) -> Res
render_type(Module, Type, Arity, Docs) -> Res
render_type(Module, Type, Arity, Docs, Config) -> Res

    Types:
        Module = module()
        Type = atom()
        Arity = arity()
        Docs = docs_v1()
        Config = config()
        Res = unicode:chardata() | {error, type_missing}

    Render the documentation of a type in a module.

render_callback(Module, Docs) -> unicode:chardata()
render_callback(Module, Docs, Config) -> unicode:chardata()
render_callback(Module, Callback, Docs) -> Res
render_callback(Module, Callback, Docs, Config) -> Res
render_callback(Module, Callback, Arity, Docs) -> Res
render_callback(Module, Callback, Arity, Docs, Config) -> Res

    Types:
        Module = module()
        Callback = atom()
        Arity = arity()
        Docs = docs_v1()
        Config = config()
        Res = unicode:chardata() | {error, callback_missing}

    Render the documentation of a callback in a module.

validate(Module) -> ok

    Types:
        Module = module() | docs_v1()

    This function can be used to do a basic validation of the doc content of application/erlang+html format.

normalize(Docs) -> NormalizedDocs

    Types:
        Docs = NormalizedDocs = chunk_elements()

    This function can be used to do whitespace normalization of application/erlang+html documentation.

supported_tags() -> [chunk_element_type()]

    This function can be used to find out which tags are supported by application/erlang+html documentation.