xcode2vimr.rb

#!/usr/bin/env ruby

USAGE = <<EOF
usage: xcode2vimr.rb [path_of_open_xcode_file]

This script talks to Xcode via osascript to determine its cursor's line number 
for the given file, then opens VimR to the specified line.

If no path argument is given, it determines the path via the title of the
frontmost Xcode window.
EOF

require 'open3'

VIMR = '/usr/local/bin/vimr'
FILE = ARGV[0] || `osascript -e 'tell application "Xcode" to \
  return path of document 1 whose name ends with \
  (word -1 of (get name of window 1))'`.chomp
abort USAGE if FILE == "-h" or FILE == "--help"

def open_to line
  `#{VIMR} #{FILE} --nvim +:#{line}`
end

def line_of pos
  open(FILE) { |f| f.read(pos).count($/) + 1 }
end

def xcode_cursor_position
  pos, status = Open3.capture2e "osascript", "-", FILE, stdin_data: <<-EOF
    to findSourceDocument(targetedPath)
      tell application "Xcode"
        repeat with i from 1 to (source document count) by 1
          tell source document i
            if its path is targetedPath then return it
          end tell
        end repeat
        source document count
      end tell
    end findSourceDocument

    to getLowestPosition(tuple)
      if item 1 of tuple < item 2 of tuple then
        return item 1 of tuple
      else
        return item 2 of tuple
      end if
    end getLowestPosition

    on run argv
      set sourceDocument to findSourceDocument(item 1 of argv)
      tell application "Xcode" to set characterRange to selected character range of sourceDocument
      return getLowestPosition(characterRange)
    end run
  EOF
  pos.to_i if status.success?
end

open_to line_of xcode_cursor_position