Accessing the name of the current function

Ruby
1

Is there away to access the name of the currently defined function?
Example: Right now I do tracing like this:

def myfunc(a,b)
trace.debug “ENTER myfunc a=#{a} b=#{b}”
…
trace.debug “LEAVE myfunc result=#{result}”
result
end

If I rename myfunc, I also have to change the word myfunc in the
trace statements. It would be convenient to have something like

trace.debug “ENTER #{function} a=#{a} b=#{b}”

Maybe Ruby already provides such a feature, and I just don’t know it…

Ronald

2

Ronald F. wrote:

Is there away to access the name of the currently defined function?
Example: Right now I do tracing like this:

def myfunc(a,b)
trace.debug “ENTER myfunc a=#{a} b=#{b}”
…
trace.debug “LEAVE myfunc result=#{result}”
result
end

If I rename myfunc, I also have to change the word myfunc in the
trace statements. It would be convenient to have something like

trace.debug “ENTER #{function} a=#{a} b=#{b}”

Maybe Ruby already provides such a feature, and I just don’t know it…

Ronald

Include this somewhere:

class Object
def current_method
caller[0] =~ /\d:in `([^’]+)’/
$1
end
end

Then use it:

def abc
puts “ENTERING: #{current_method}”
…
end

Gives: “ENTERING abc”

best,
Dan

3

On Jul 16, 10:56 am, “Ronald F.” [email protected]
wrote:

If I rename myfunc, I also have to change the word myfunc in the
trace statements. It would be convenient to have something like

trace.debug “ENTER #{function} a=#{a} b=#{b}”

Facets has this Kernel method for it.

module Kernel

def called
  /\`([^\']+)\'/.match(caller(1).first)[1].to_sym
end

end

See http://facets.rubyforge.org.

I think the plan for 1.9 is to have method and callee, which
differ based on aliasing. (Guess Matz decided shadow methods are
here to stay).

T.

4

The caller() method has what you’re looking for.

Here’s my equivalent of what you do:

dbg ‘some stuff’, an_object

def dbg *args
if ENV[‘RAILS_ENV’] == ‘test’
stack = caller(1).slice(0, 5)
$stdout << “==========================\n”
pp(*args)
stack.each do |s|
puts s
end
end
end

  • James M.