Nice-to-haves

[icweaver]

Just jotting some of these down here so I don't forget. Also happy to adjust if some of the current behavior is preferred.

Update: Subsumed by #31

Complete #26

• Storing dictionaries typed more specifically than Dict{Any, Any}. Would allow to do things like:

  af_payload = Dict(
      "meta" => Dict("my" => Dict("nested" => "metadata")),
      "data" => [1, 2, 3, 4],
  )
  
  ASDF.write_file("my_asdf.asdf", af_payload)
  
  af = ASDF.load_file("my_asdf.asdf")

  instead of needing to widen it first by manually typing af_payload = Dict{Any, Any}(...)

• Define getindex for ASDF.ASDFFile so that it can be indexed directly instead of needing to go through the internal .metadata field. In other words, get af["data"] working instead of af.metadata["data"].

• Nice tree printing for ASDF.ASDFFile in the terminal. Might be nice to emulate what asdf.py info does:

  root (AsdfObject)
  ├─asdf_library (Software)
  │ ├─author (str): The ASDF Developers
  │ ├─homepage (str): http://github.com/asdf-format/asdf
  │ ├─name (str): asdf
  │ └─version (str): 5.1.0
  ├─history (dict)
  │ └─extensions (list)
  │   └─[0] (ExtensionMetadata) ...
  ├─co-Is (list)
  │ ├─[0] (str): Bug

• FileIO.jl support so that load(my_file.asdf) will work