process_xcodebuild_log.rb

#!/usr/bin/env ruby
require 'optparse'
require 'pathname'
require 'json'

# http://danielbeard.io/2016/08/17/swift-file-compile-times.html

# Helper function to parse filename
def parse(input)
  result = ""
  processing_space_escape = false
  input.each_char { |c|
    if c == '\\'
      result += c
      processing_space_escape = true
    elsif c == ' ' && processing_space_escape == true
      result += c
      processing_space_escape = false
    elsif c == ' ' && processing_space_escape == false
      return result
    else
      result += c
    end
  }
  return result
end

compiling_swift_file = false
current_filename = ""
current_offset = 0

# all stdin lines
ARGF.each do |line|

    # Wait until we hit a CompileSwift file
    if line =~ /^[\s]*CompileSwift[\s]+/
      compiling_swift_file = true
      current_filename = parse(line[line.index('/')..-1]).chomp
    end

    # If we get here and aren't currently compiling a swift file, skip all else
    if compiling_swift_file == false
      next
    end

    # Ignore everything until we hit the "Swift compilation line"
    if current_offset == 0 && line =~ /Swift compilation/
      current_offset = 1
    elsif current_offset >= 1
      current_offset += 1

      # This line has the total elapsed time.
      if current_offset == 3
        wall_time = line.gsub(/^.*\(/, '').match(/[-+]?[0-9]*\.?[0-9]+/) # Second fp value is the one we want.
        puts "#{wall_time}s #{current_filename}"
        compiling_swift_file = false
        current_filename = ""
        current_offset = 0
      end
    end
end