Using ruby array insert

##When I have to insert numbers that are omitted between numbers###
##For example, the file contents are as follows.

00:data
04:data
05:data
06:data
07:data
08:data
09:data
10:data
13:data
14:data
15:data
16:data
19:data

I need to insert 01,02,03 between 00 and 04. And I also need to insert 11,12.

On linux box, I may have to use awk sed or perl. But for me ruby is much easier.
The code is as follows.


[root@redhat2 ~]# cat t.rb
#!/usr/bin/env ruby

#Function to less than 9 insert method differently
def more_than_9(a,n)
    if n < 9
       a.insert(n,"0#{n}:data")
    else
       a.insert(n,"#{n}:data")
    end
end

#File open and into array
a=File.new("./test.csv").read.split("\n")
s=a.size
i=0
 while i < (s-1)
    if (a[i+1].split(":")[0].to_i - a[i].split(":")[0].to_i) > 1
     nx=a[i+1].split(":")[0].to_i

     while i+1 < nx
      n=i+1
       more_than_9(a,n)
      i=n
     end
    end
    i=i+1
 end

#Puts results
puts a

#So, the result of executing this script is as follows.
[root@redhat2 ~]# ruby t.rb
00:data
01:data
02:data
03:data
04:data
05:data
06:data
07:data
08:data
09:data
10:data
11:data
12:data
13:data
14:data
15:data
16:data
19:data

# #################################3