A method for opening the `source_location` of a method or proc in your preferred editor

OpenSource.rb

# A method for opening the `source_location`
# of a method or proc in your preferred editor.
# Depends on the presence of $EDITOR in your environment.
module OpenSource
  def open_source
    return false unless
      loc = source_location and
      loc.first != '(irb)'
    path = loc.join(':') # append the line number to the file path.
    system("eval \"$EDITOR #{path}\"")
  end
end

UnboundMethod.include OpenSource
Method.include OpenSource
Proc.include OpenSource

# Example Usage

# opens /path/to/lib/ruby/2.3.0/cmath.rb to line 281 in Sublime
# works for Gems, your own sources, etc.
Math.method(:cos).open_source
#=> true

# methods defined in (irb) will not be opened
Proc.method(:open_source).open_source
#=> false

# methods defined in Ruby's native code will not be opened
Object.method(:to_s).open_source
#=> false