otool_fix.rb

main_bin = ARGV[0]

REPLACES = {
  "@@HOMEBREW_PREFIX@@" => `brew --prefix`.chomp,
  "@@HOMEBREW_CELLAR@@" => `brew --cellar`.chomp
}
VALID_REPLACE = Regexp.union(REPLACES.keys)

OTOOL = "otool"
CHANGE_TOOL = "install_name_tool"

def get_depends(bin)
  dependencies = []
  result = cmd([OTOOL, "-L", bin], true)
  result.readline
  result.each_line do |line|
    if line =~ VALID_REPLACE
      line.match(/^\s([^\s]+)/) do |matches|
        dependencies << matches[1]
      end
    end
  end
  dependencies
end

def replace(dependency, bin)
  new = dependency.dup
  REPLACES.each do |k,v|
    new.sub!(k, v)
  end
  cmd(["sudo", CHANGE_TOOL, "-change", dependency, new, bin], true)
  new
end

def run_replacement(bin)
  puts "Working with #{bin}"
  new_dependencies = []
  dependencies = get_depends(bin)
  dependencies.each do |dependency|
    puts "have dependency #{dependency.inspect}"
    new_dependencies << replace(dependency, bin)
  end
  new_dependencies
end

def cmd(cmd, not_dry_run)
  puts "running #{cmd}"
  if not_dry_run
    io = IO.popen(cmd)
    select [io]
    io
  end
end

if main_bin
  dependencies = run_replacement(main_bin)
  dependencies.each do |d|
    run_replacement(d)
  end
end