Prints missing/unused Go deps for https://github.com/bsm/mgmt

mgmt-deps.rb

require 'json'
require 'set'

myself = `go list`.strip

deps = Set.new
`go list ./...`.each_line do |dep|
  pdeps = JSON.parse(`mgmt go list -json #{dep}`)
  deps += pdeps['Deps']
  deps += pdeps['TestImports'] if pdeps['TestImports']
end

all = deps.select do |dep|
  dep.split('/').first.include? '.'
end.map do |dep|
  dep.split('/')[0..2].join('/')
end.uniq.sort

existing = File.read('Gopherfile').each_line.map do |l|
  l.strip.split(/\s+/)
end.reject do |l|
  l.empty?
end.map do |l|
  l.first
end

missing = all - existing - [myself]
unused = existing - all - [myself]

puts "Missing packages:\n#{missing.join "\n"}"

puts "Unused packages:\n#{unused.join "\n"}"