結論
callerだった。
使用例:
$ pry [1] pry(main)> caller => ["/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/pry_instance.rb:355:in `eval'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/pry_instance.rb:355:in `evaluate_ruby'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/pry_instance.rb:323:in `handle_line'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/pry_instance.rb:243:in `block (2 levels) in eval'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/pry_instance.rb:242:in `catch'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/pry_instance.rb:242:in `block in eval'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/pry_instance.rb:241:in `catch'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/pry_instance.rb:241:in `eval'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/repl.rb:77:in `block in repl'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/repl.rb:67:in `loop'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/repl.rb:67:in `repl'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/repl.rb:38:in `block in start'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/input_lock.rb:61:in `call'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/input_lock.rb:61:in `__with_ownership'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/input_lock.rb:79:in `with_ownership'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/repl.rb:38:in `start'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/repl.rb:15:in `start'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/pry_class.rb:169:in `start'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/cli.rb:219:in `block in <top (required)>'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/cli.rb:83:in `call'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/cli.rb:83:in `block in parse_options'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/cli.rb:83:in `each'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/lib/pry/cli.rb:83:in `parse_options'", "/Users/hoge/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/pry-0.10.3/bin/pry:16:in `<top (required)>'", "/Users/hoge/.rbenv/versions/2.2.3/bin/pry:23:in `load'", "/Users/hoge/.rbenv/versions/2.2.3/bin/pry:23:in `<main>'"]
よもやま
ところでcallerって、メソッドだっけ? それとも特殊な変数か何か? というのが気になった。
このような疑問が湧いた時、defined?を使うと、コンソール上でこれを確認できる。
[9] pry(main)> defined? caller => "method"
ところでところで、defined?には調べたいもののシンボルや文字列では無く、調べたい物を直接渡す。
[11] pry(main)> defined? caller => "method"
おなじくメタ情報を取得する#methodの場合は、シンボルで引数として受け取ってる。
[13] pry(main)> method(:caller) => #<Method: Object(Kernel)#caller>
defined?はなんで構文上意味がある物を直接受け取る事ができるんだろう。
defined?はメソッドなんだろうか?
defined? defined?としてみたが syntax errorになってしまった。
すくなくともメソッドでは無い。
method(:defined?) NameError: undefined method `defined?' for class `Object' from (pry):17:in `method'
