Iterate delimited file as NamedTuples

Specific Domains Data
3

Thank you for your help. I benchmarked your solution agains the “naive” one below

using Libz

function dofields(f, io;
                  progress = 1000000, limit = 0, delim = ';', maxlines = 0)
    line = 0
    while !eof(io)
        if isa(progress, Integer) && line % progress == 0
            print(".")
        end
        line += 1
        if maxlines > 0 && line ≥ maxlines
            break
        end
        f(split(readline(io), delim; limit = limit))
    end
end

function stats(filename; options...)
    io = open(filename, "r")
    c = Dict{String,Int}()
    dofields(ZlibInflateInputStream(io);
             limit = 7, delim = ';', options...) do fields
                 kind = fields[6]
                 c[kind] = get(c, kind, 0) + 1
             end
    close(io)
    c
end

and using the getiterator approach takes about 10x longer (850s vs the 90s for dofields above).

I wonder if I could have my cake and eat it to, and define a Data.Source for this particular purpose. I have looked at the functions, and it is unclear to me how to make a NamedTuple from a given set of column names (I guess I cannot use @NT since they are not known at compile time). I am actually reading the column names from another file.