input: remove attrs method since it's deprecated

replace it with calls to read_attribute and attributes

src/input.jl

@@ -262,15 +262,15 @@ function get_field(ts::OpenPMDTimeSeries; it::Int, field::String, verbose::Bool=
 end
 
 function read_openpmd_file(fid::HDF5.File, it::Integer)
- basePath = read(attrs(fid)["basePath"])
+ basePath = read_attribute(fid, "basePath")
  basePath = replace(basePath, "%T" => it)
- meshesPath = read(attrs(fid)["meshesPath"])
+ meshesPath = read_attribute(fid, "meshesPath")
 
  # pointer to base group (ie, with the information for the requested time
  # level) within the given hdf5 file
  grp_base = fid[basePath]
 
- time = read(attrs(grp_base)["time"])
+ time = read_attribute(grp_base, "time")
 
  # pointer to mesh group (with the actual chart function data)
  grp_mesh = grp_base[meshesPath]
@@ -279,33 +279,32 @@ function read_openpmd_file(fid::HDF5.File, it::Integer)
 end
 
 function read_group_attributes(grp::HDF5.Group)
- grp_attrs = attrs(grp)
- keys = names(grp_attrs)
- vals = read.(Ref(grp_attrs), keys)
- Dict(keys[i] => vals[i] for i in 1:length(keys))
+ grp_attrs = attributes(grp)
+ ks  = keys(grp_attrs)
+ vals = read_attribute.(Ref(grp), ks)
+ Dict(ks[i] => vals[i] for i in 1:length(ks))
 end
 
 function read_dataset(grp::HDF5.Group, var::String)
- dset = grp[var]
- dset_attrs = attrs(dset)
+ dset = grp[var]
 
  func = read(dset)
  nodes = size(func)
  T = eltype(func)
  dim_ = length(nodes)
 
  if dim_ == 1
- names = read(dset_attrs["axisLabels"])
- mins = read(dset_attrs["gridGlobalOffset"])
- maxs = read(dset_attrs["gridMax"])
- gridtypes = read(dset_attrs["gridType"])
+ names = read_attribute(dset, "axisLabels")
+ mins = read_attribute(dset, "gridGlobalOffset")
+ maxs = read_attribute(dset, "gridMax")
+ gridtypes = read_attribute(dset, "gridType")
  else
  # remember to flip the order since HDF5 uses row-major order to store
  # arrays, as opposed to Julia's column-major order
- names = read(dset_attrs["axisLabels"])[end:-1:1]
- mins = read(dset_attrs["gridGlobalOffset"])[end:-1:1]
- maxs = read(dset_attrs["gridMax"])[end:-1:1]
- gridtypes = read(dset_attrs["gridType"])[end:-1:1]
+ names = read_attribute(dset, "axisLabels")[end:-1:1]
+ mins = read_attribute(dset, "gridGlobalOffset")[end:-1:1]
+ maxs = read_attribute(dset, "gridMax")[end:-1:1]
+ gridtypes = read_attribute(dset, "gridType")[end:-1:1]
  end
 
  chart = Chart(gridtypes, names, mins, maxs, nodes)