Is it possible to access Pry's show-source
method from within a Ruby file? If so, how is this done?
For example, if I had this file:
# testing.rb
require 'pry'
def testing
puts 'hi'
end
puts show-source testing
And ran ruby testing.rb
, I'd like the output:
Owner: testing.rb
Visibility: public
Number of lines: 3
def testing
puts 'hi'
end
To explain the rationale for this, I have a test stubbing a method, though the original seems to be getting called on occassion and I thought it would be handy to output the source of the call to see where it's coming from. I know there are simpler ways of doing this, though started down this rabbit hole and am interested in seeing whether this can be done :)
Running the slightly head-twisting show-source show-source
shows a few methods within the Pry::Command::ShowSource
class, which inherits from Pry::Command::ShowInfo
.
Pry::Command::ShowSource
shows three methods: options
, process
and content_for
, though I've not been able to successfully call any.
My best assumption is the content_for
method handles this, working with a code object assigned from the parent class (i.e. Pry::CodeObject.lookup(obj_name, _pry_, :super => opts[:super])
), though I've not been able to crack this.
Anyone have any ideas or examples of doing this?
Ruby has the build-in method Method#source_location which can be used to find the location of the source. The method_source gem builds upon this by extracting the source based upon the source location. However this doesn't work for methods defined in the interactive console. Methods must be defined in a file.
Here is an example:
require 'set'
require 'method_source'
puts Set.method(:[]).source_location
# /home/user/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/set.rb
# 74
#=> nil
puts Set.method(:[]).source
# def self.[](*ary)
# new(ary)
# end
#=> nil
Keep in mind that all core Ruby methods are written in C and return nil
as source location. 1.method(:+).source_location #=> nil
The standard library is written in Ruby itself. Therefore the example above works for Set methods.