Update repo structure as part of nixification

legacy/bin/dotutils.rb

@@ -0,0 +1,76 @@
+# frozen_string_literal: true
+
+def existing_symlink(source, destination)
+  return if File.readlink(destination).eql?(source)
+
+  # rubocop:disable Layout/LineLength
+  if @prompt.yes?("#{destination} currently points to #{File.readlink(destination)}, do you want point it at #{source}?")
+    File.unlink(destination)
+    puts "Linking #{destination} to #{source}"
+    File.symlink(source, destination)
+    puts 'link replaced'
+  else
+    puts "#{destination} is unchanged"
+  end
+  # rubocop:enable Layout/LineLength
+end
+
+# rubocop:disable Metrics/MethodLength
+def rename_file(source, destination, action)
+  puts "#{destination} exists, renaming to #{destination}.predots"
+  File.rename(destination, "#{destination}.predots")
+  case action
+  when 'link'
+    puts "Linking #{destination} to #{source}"
+    File.symlink(source, destination)
+  when 'copy'
+    puts "Copying #{destination} to #{source}"
+    FileUtils.cp_r(source, destination)
+  else
+    raise ArgumentError, "'#{action}' is not a valid action", backtrace
+  end
+end
+# rubocop:enable Metrics/MethodLength
+
+def copy_file(source, destination)
+  if File.exist?(destination)
+    if @prompt.yes?("#{destination} exists, do you want to replace it?")
+      rename_file(source, destination, 'copy')
+    else
+      puts "#{destination} is unchanged"
+    end
+  else
+    FileUtils.cp_r(source, destination)
+  end
+end
+
+def link_file(source, destination)
+  if File.exist?(destination) && File.symlink?(destination)
+    existing_symlink(source, destination)
+  elsif File.exist?(destination)
+    # this catches anything that is not a symlink
+    rename_file(source, destination, 'link')
+  else
+    puts "Linking #{destination} to #{source}"
+    File.symlink(source, destination)
+  end
+end
+
+# rubocop:disable Metrics/MethodLength, Metrics/AbcSize
+def mac_vers
+  stdout, _stderr, _status = Open3.capture3('sw_vers -productVersion')
+  if Integer(stdout.strip.split('.')[0]) == 10
+    if Integer(stdout.strip.split('.')[1]) >= 12
+      puts "It seems you are on macOS #{stdout.strip}"
+    else
+      puts "It seems you are on OX X #{stdout.strip}"
+    end
+
+  elsif Integer(stdout.strip.split('.')[0]) < 10
+    puts "Wow... you're sure running an old os (#{stdout.strip} to be exact)"
+  else
+    abort("It seems you are on a Mac but I don't know what to do on \
+      v#{stdout.strip}")
+  end
+end
+# rubocop:enable Metrics/MethodLength, Metrics/AbcSize