Module: FindFollow

Included in:
Pod::Command::Pack
Defined in:
lib/cocoapods-pack/find_follow.rb

Instance Method Summary collapse

Instance Method Details

#find_follow(*paths) ⇒ Object 



40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
 
# File 'lib/cocoapods-pack/find_follow.rb', line 40

def find_follow(*paths)
  block_given? || (return enum_for(__method__, *paths))

  link_cache = {}
  link_resolve = lambda { |path|
    # puts "++ link_resolve: #{path}" # trace
    return link_cache[path] if link_cache[path]

    return link_cache[path] = Pathname.new(path).realpath.to_s
  }
  # this lambda should cleanup `link_cache` from unnecessary entries
  link_cache_reset = lambda { |path|
    # puts "++ link_cache_reset: #{path}" # trace
    # puts link_cache.to_s # trace
    link_cache.select! do |k, _v|
      path == k || k == '/' || path.start_with?(k + '/')
    end
    # puts link_cache.to_s # trace
  }
  link_is_recursive = lambda { |path|
    # puts "++ link_is_recursive: #{path}" # trace
    # the ckeck is useless if path is not a link but not our responsibility

    # we need to check full path for link cycles
    pn_initial = Pathname.new(path)
    unless pn_initial.absolute?
      # can we use `expand_path` here? Any issues with links?
      pn_initial = Pathname.new(File.join(Dir.pwd, path))
    end

    # clear unnecessary cache
    link_cache_reset.call(pn_initial.to_s)

    link_dst = link_resolve.call(pn_initial.to_s)

    pn_initial.ascend do |pn|
      return { link: path, dst: pn } if pn != pn_initial && link_dst == link_resolve.call(pn.to_s)
    end

    return false
  }

  do_find = proc { |path|
    Find.find(path) do |result|
      if File.symlink?(result) && File.directory?(File.realpath(result))
        if result[-1] == '/'
          # probably hitting https://github.com/jruby/jruby/issues/1895
          yield(result.dup)
          Dir.new(result).each do |subpath|
            do_find.call(result + subpath) unless ['.', '..'].include?(subpath)
          end
        elsif is_recursive = link_is_recursive.call(result)
          raise "cannot handle recursive links: #{is_recursive[:link]} => #{is_recursive[:dst]}"
        else
          do_find.call(result + '/')
        end
      else
        yield(result)
      end
    end
  }

  while path = paths.shift
    do_find.call(path)
  end
end