find new authors between git tags in julia

gistfile1.txt

begin
# assuming pwd is a julia git clone
vers = ["v0.2.0", "v0.3.0", "v0.4.0", "v0.5.0", "release-0.6"]
auths = Dict{String, Vector{String}}()
for v in vers
    auths[v] = unique(map(chomp, readlines(`git log --format=%aN $v`)))
end
for i in 2:length(vers)
    v1,v2 = vers[i-1],vers[i]
    diff = setdiff(auths[v2], auths[v1])
    println("$v1 to $v2: $(length(diff))")
    println("authors: ...")
    print(diff)
    print("\n\n\n")
end
end

gistfile2.txt

function last_first_sort(s1,s2)
  s1s = split(lowercase(s1))
  s2s = split(lowercase(s2))
  s1k = length(s1s) > 1 ? s1s[end] : s1s[1]
  s2k = length(s2s) > 1 ? s2s[end] : s2s[1]
  return s1k < s2k
end