filename.RData vs filename.Rdata

[KronosTheLate]

So I have an Rdata file, as seen below:

The file extension is clearly Rdata. However, I get the following when reading it:

julia> using RData

julia> objs = load(joinpath(datadir, "data.Rdata"))
Error encountered while load FileIO.File{FileIO.DataFormat{:GZIP}, String}("C:\\Users\\username\\GeekyStuff\\Data\\data.Rdata").

Fatal error:
ERROR: Libz load error: neither load nor fileio_load is defined
  due to FileIO.SpecError(Libz, :load)
  Will try next loader.

Stacktrace:
 [1] action(::Symbol, ::Vector{Union{Base.PkgId, Module}}, ::FileIO.Formatted; options::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
   @ FileIO C:\Users\username\.julia\packages\FileIO\QkYgA\src\loadsave.jl:209
 [2] action
   @ C:\Users\username\.julia\packages\FileIO\QkYgA\src\loadsave.jl:197 [inlined]
 [3] action(::Symbol, ::Vector{Union{Base.PkgId, Module}}, ::Symbol, ::String; options::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
   @ FileIO C:\Users\username\.julia\packages\FileIO\QkYgA\src\loadsave.jl:185
 [4] action
   @ C:\Users\username\.julia\packages\FileIO\QkYgA\src\loadsave.jl:185 [inlined]
 [5] load(::String; options::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
   @ FileIO C:\Users\username\.julia\packages\FileIO\QkYgA\src\loadsave.jl:113
 [6] load(::String)
   @ FileIO C:\Users\username\.julia\packages\FileIO\QkYgA\src\loadsave.jl:110
 [7] top-level scope
   @ REPL[19]:1
Stacktrace:
 [1] handle_error(e::FileIO.LoaderError, q::Base.PkgId, bt::Vector{Union{Ptr{Nothing}, Base.InterpreterIP}})
   @ FileIO C:\Users\username\.julia\packages\FileIO\QkYgA\src\error_handling.jl:61
 [2] handle_exceptions(exceptions::Vector{Tuple{Any, Union{Base.PkgId, Module}, Vector}}, action::String)
   @ FileIO C:\Users\username\.julia\packages\FileIO\QkYgA\src\error_handling.jl:56
 [3] action(::Symbol, ::Vector{Union{Base.PkgId, Module}}, ::FileIO.Formatted; options::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
   @ FileIO C:\Users\username\.julia\packages\FileIO\QkYgA\src\loadsave.jl:228
 [4] action
   @ C:\Users\username\.julia\packages\FileIO\QkYgA\src\loadsave.jl:197 [inlined]
 [5] action(::Symbol, ::Vector{Union{Base.PkgId, Module}}, ::Symbol, ::String; options::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
   @ FileIO C:\Users\username\.julia\packages\FileIO\QkYgA\src\loadsave.jl:185
 [6] action
   @ C:\Users\username\.julia\packages\FileIO\QkYgA\src\loadsave.jl:185 [inlined]
 [7] load(::String; options::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
   @ FileIO C:\Users\username\.julia\packages\FileIO\QkYgA\src\loadsave.jl:113
 [8] load(::String)
   @ FileIO C:\Users\username\.julia\packages\FileIO\QkYgA\src\loadsave.jl:110
 [9] top-level scope
   @ REPL[19]:1

However, it works fine if I pretend the extension is RData:

julia> objs = load(joinpath(datadir, "data.RData"))
Dict{String, Any} with 1 entry:
  "ciphers" => [1.0 1.0 … 0.0 0.0; 1.0 1.0 … 0.0 0.0; … ; 1.0 8.0 … 0.0 0.0; 1.0 8.0 … 0.0 0.0]

The error gives no hint about this - I found it from the final comment in this discourse post.

What to do about it

Optimally, this package could figure this problem out on its own. Second best, the error message could suggest changing the file extension from Rdata to RData or rda.

[nalimilan]

Duplicate of #91.