Lightning Talk Pry

Pry is a great alternative to IRB, with many features the latter doesn't have. This talk quickly reviews some of them.

1. PRY More than « IRB with colors »
2. WHY? IRB works, right?
3. Well…
4. Syntax coloration? ! Persistent history? ! Paging results?
5. PRY Has those *by default* ! And more.
6. Shell integration
7. [1] pry(main)> .git status On branch master Your branch is up-to-date with 'origin/master'.
8. Dev-friendly
9. [8] pry(main)> cd FileUtils
 [9] pry(FileUtils):1> ls constants: DryRun Entry_ LOW_METHODS LowMethods METHODS FileUtils.methods: cd compare_stream install mv … FileUtils#methods: mode_to_s instance variables: @fileutils_label @fileutils_output locals: _ __ _dir_ _ex_ _file_ _in_ _out_ _pry_
10. [10] pry(FileUtils):1> cd [] [11] pry(#<Array>):2> ls
 Enumerable#methods: [...] Array#methods: [...]
 self.methods: __pry__
11. [3] pry(main)> show-doc String#gsub From: string.c (C Method): Owner: String Visibility: public Signature: gsub(*arg1) Number of lines: 34 ! Returns a copy of str with the all occurrences of pattern substituted for the second argument. [...]
12. [10] pry(main)> show-source String#gsub From: string.c (C Method): Number of lines: 5 ! static VALUE rb_str_gsub(int argc, VALUE *argv, VALUE str) { return str_gsub(argc, argv, str, 0); }
13. [5] pry(main)> raise ArgumentError, "Date expected, received Date" ArgumentError: Date expected, received Date from (pry):1:in `__pry__'
 ! ! ! ! ! ! !
14. [5] pry(main)> raise ArgumentError, "Date expected, received Date" ArgumentError: Date expected, received Date from (pry):1:in `__pry__'
 [6] pry(main)> wtf? Exception: ArgumentError: Date expected, received Date -- 0: (pry):1:in `__pry__' 1: /Users/ksol/.rbenv/versions/2.0.0-p247/lib/ruby/gems/ 2.0.0/gems/pry-0.9.12.2/lib/pry/pry_instance.rb:328:in `eval’ …
15. See/replay history inside a session ! Special locals (last file opened, etc) ! Open in $EDITOR ! …
16. DEBUGGER
17. binding.pry
18. Plugins! ! eg: pry-nav, pry-debugger, pry-stack_explorer ! => next, step, finish, break, up, down, show- stack, …
19. http://pryrepl.org
20. Thanks! @ksol (twitter/SO/Github)