Utility functions for EDoc.
Creates an environment data structure used by parts of EDoc for
generating references, etc. See edoc:run/2 for a description
of the options file_suffix, app_default and doc_path.
See also: edoc:get_doc/3, edoc_extract:source/4.
Infer application containing the given module.
It's expected that modules which are not preloaded
and don't match the <app>/ebin/<mod>.beam path pattern
will NOT have an app name inferred properly.
no_app is returned in such cases.
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