Feature request/question: breaking on specific function argument values

[Eugene Pirogov]

Would it be possible to implement break on a specific function clause? Right now it's possible to break on a function with a particular arity:

IEx.Pry.break(Ecto.Repo.Schema, :dump_field!, 6, 100)

But usually during debugging I'm waiting for a specific argument to be passed, so ideally I'd like to do this:

IEx.Pry.break(Ecto.Repo.Schema, :dump_field!, [_, _, _, :birth_date, ~D[1996-12-12], _])

Right now every time I get to the break point, I check if the field is :birth_date, and the date is the one I'm interested. If they are not – I move on to the next break point via continue. It is a manual process, so I wonder if it make sense (and also whether it is technically possible) to break by matching on argument values.

[José Valim]

This is definitely possible in case someone is looking to implement it. What the break point system does is to recompile the module with a case clause that triggers the breakpoint. Therefore you should be able to get the behaviour above as long as you change the breakpoint system to compile a pattern match on those arguments. Please open up an issue and we may be able to add this on Elixir v1.6.

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Director of R&D

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