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def detect_project_root(path)
  path = File.dirname(path)

  if Dir.glob(File.join(path, ".git")).count > 0
    return path
  end

  return nil if path == "/"
  detect_project_root(path)
end

full_path = `osascript<<END
  tell application "Xcode"
    set file_name to name of front window
    set file_name to replace(file_name, " — Edited", "") of me
    
    set num to number of source document
    
    repeat with index from 0 to num
      set file_path to path of source document index
      set pos to offset of file_name in file_path
      
      if pos is greater than 0 then
        return file_path
      end if
    end repeat
  end tell

  on replace(orgStr, tgtStr, newStr)
    
    local orgDelim, rtn
    
    set orgDelim to AppleScript's text item delimiters
    set AppleScript's text item delimiters to {tgtStr}
    set rtn to every text item of orgStr
    set AppleScript's text item delimiters to {newStr}
    set rtn to rtn as string
    set AppleScript's text item delimiters to orgDelim
    return rtn
    
  end replace
END`.strip

project_root = detect_project_root(full_path)
file_path = full_path.sub("#{project_root}/", '')

repository = nil
branch = nil
Dir.chdir project_root do
  `git remote -v`.strip.lines do |line|
    if line =~ %r{git@github.com:(.+)\.git \(fetch\)$} || line =~ %r{https://github.com/(.+) \(fetch\)$}
      repository = $1
      break
    end
  end
  exit unless repository

  `git branch -r`.strip.lines do |line|
    if line =~ %r{.+/HEAD -> .+/(.+)$}
      branch = $1
      break
    end
  end
  exit unless branch
end

line = ARGV[0] || ""
unless line.empty?
  line = "#" + line
end

system "open 'https://github.com/#{repository}/blob/#{branch}/#{file_path}#{line}'"