Ruby, 80 bytes

->s,c{z=0;s.split(?|).map{[" "*z+_1,z+=_1.size][0].ljust(1+s.tr(?|,"").size)+c}}

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I managed to golf a non-regex based solution to tie with the other Ruby. There might still be a couple bytes to be golfed off. I’m still learning Ruby so it took a while to get it this short.

Explanation:

->s,c{…} Proc (lambda function) taking arguments s (code) and c (comment)

• z=0; Assign variable z to zero

• s.split(?|) Split s on |

• .map{…} Map each _1 in the list to:

  • [" "*z+_1,z+=_1.size][0] Return _1 with z spaces prepended, before adding the length of _1 to z.

  • .ljust(…) Append spaces until the length is equal to…

    • 1+s.tr(?|,"").size One more than the length of s with | removed.

  • +c Append the comment character to the end of the line.

Ruby, 80 74 bytes

->i,c{a=0;(i=i.split ?|).map{" "*a+_1+" "*(1+i.join.size-(a+=_1.size))+c}}

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I managed to golf a non-regex based solution to beat the other Ruby. The solution previously tied but I found a slightly different method that is 6 bytes shorter.

Explanation:

->i,c{…} Proc (lambda function) taking arguments i (code) and c (comment)

• a=0; Assign variable a to zero

• (i=i.split ?|) Assign i to it split on |

• .map{…} Map each _1 in the list to:

  • " "*a a spaces 

  • +_1 Append the list item

  • +" "*(…) Append this many spaces:

    • 1+i.join.size The size of i with | removed, plus one for the extra space
    • -(a+=_1.size) Add the size of the list item to a and subtract a from this.

  • +c Append the comment character to the end of the line.

Ruby, 80 bytes

->s,c{z=0;s.split(?|).map{[" "*z+_1,z+=_1.size][0].ljust(1+s.tr(?|,"").size)+c}}

Attempt This Online!

I managed to golf a non-regex based solution to tie with the other Ruby. There might still be a couple bytes to be golfed off. I’m still learning Ruby so it took a while to get it this short.

Ruby, 80 bytes

->s,c{z=0;s.split(?|).map{[" "*z+_1,z+=_1.size][0].ljust(1+s.tr(?|,"").size)+c}}

Attempt This Online!

I managed to golf a non-regex based solution to tie with the other Ruby. There might still be a couple bytes to be golfed off. I’m still learning Ruby so it took a while to get it this short.

Explanation:

->s,c{…} Proc (lambda function) taking arguments s (code) and c (comment)

• z=0; Assign variable z to zero

• s.split(?|) Split s on |

• .map{…} Map each _1 in the list to:

  • [" "*z+_1,z+=_1.size][0] Return _1 with z spaces prepended, before adding the length of _1 to z.

  • .ljust(…) Append spaces until the length is equal to…

    • 1+s.tr(?|,"").size One more than the length of s with | removed.

  • +c Append the comment character to the end of the line.