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How to track ruby ​​program progress

I am new to ruby ​​and I want to track the ruby ​​program execution process when I'm confused by some programs. I wonder if there is a way to help me keep track of shell scripts like set -xdo?

PS:

For example, shell script test.sh:

set -x
ls /home
echo "hello dujun and haotianma!"

when I execute test.sh, then the output will look like this:

+ ls /home
dujun  haotianma
+ echo 'hello dujun and haotianma!'
hello dujun and haotianma!

Just like this bash script echos each statement before executing it, I want to do a Ruby program show which statements are executed.

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1 answer

I think you can use Ruby stdlib Tracer.

I wrote the code in a file test.rb:

require 'tracer'

Tracer.on

class A
  def square(a)
    @b = a*a
    result
  end
  def result
    @b
  end
end

a = A.new
puts a.square(5)

Tracer.off

Now run the code and see everything that happens under the hood:

(arup~>Ruby)$ ruby test.rb
#0:test.rb:5::-: class A
#0:test.rb:5::C: class A
#0:test.rb:6::-:   def square(a)
#0:test.rb:10::-:   def result
#0:test.rb:13::E: end
#0:test.rb:15::-: a = A.new
#0:test.rb:16::-: puts a.square(5)
#0:test.rb:6:A:>:   def square(a)
#0:test.rb:7:A:-:     @b = a*a
#0:test.rb:8:A:-:     result
#0:test.rb:10:A:>:   def result
#0:test.rb:11:A:-:     @b
#0:test.rb:12:A:<:   end
#0:test.rb:9:A:<:   end
25
#0:test.rb:18::-: Tracer.off
(arup~>Ruby)$

. .

require 'tracer'

class A
  def square(a)
    @b = a*a
    result
  end
  def result
    @b
  end
end

Tracer.on

a = A.new
puts a.square(5)

Tracer.off

, :

(arup~>Ruby)$ ruby test.rb
#0:test.rb:15::-: a = A.new
#0:test.rb:16::-: puts a.square(5)
#0:test.rb:4:A:>:   def square(a)
#0:test.rb:5:A:-:     @b = a*a
#0:test.rb:6:A:-:     result
#0:test.rb:8:A:>:   def result
#0:test.rb:9:A:-:     @b
#0:test.rb:10:A:<:   end
#0:test.rb:7:A:<:   end
25
#0:test.rb:18::-: Tracer.off
(arup~>Ruby)$
+10

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