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.

Transcript

1. PRY
   More than « IRB with colors »
   

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2. WHY?
   IRB works, right?
   

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3. Well…
   

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4. Syntax coloration?
   !
   Persistent history?
   !
   Paging results?
   

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5. PRY
   Has those *by default*
   !
   And more.
   

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6. Shell
   integration
   

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7. [1] pry(main)> .git status
   On branch master
   Your branch is up-to-date with
   'origin/master'.
   

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8. Dev-friendly
   

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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_
   

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10. [10] pry(FileUtils):1> cd []
    [11] pry(#):2> ls

    Enumerable#methods: [...]
    Array#methods: [...]

    self.methods: __pry__
    

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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. [...]
    

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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);
    }
    

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13. [5] pry(main)> raise ArgumentError, "Date expected,
    received Date"
    ArgumentError: Date expected, received Date
    from (pry):1:in `__pry__'

    !
    !
    !
    !
    !
    !
    !
    

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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’
    …
    

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15. See/replay history inside a session
    !
    Special locals (last file opened, etc)
    !
    Open in $EDITOR
    !
    …
    

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16. DEBUGGER
    

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17. binding.pry
    

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18. Plugins!
    !
    eg: pry-nav, pry-debugger, pry-stack_explorer
    !
    => next, step, finish, break, up, down, show-
    stack, …
    

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19. http://pryrepl.org
    

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20. Thanks!
    @ksol (twitter/SO/Github)
    

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