Eat the Chocolate Bar

Question

I have a chocolate bar and I need help eating it so you'll be writing a program just to do that.

Explanation

The first line is the input. Examples are separated by an empty line.

7
   ____
 __|__|
|__|__|
|__|__|
|__|__|

6
_______
|__|__|
|__|__|
|__|__|

5
   ____
 __|__|
|__|__|
|__|__|

0


1
   ____
   |__|

Spec

Hopefully the examples clearly specify this challenge but to avoid any possible confusion, here's a spec:

You can have a single optional trailing/leading whitespace

An input of 0 is an empty output.

If the input is even, the top rows looks like:

_______
|__|__|

If it's odd, the top row is:

   ____
   |__|

If it's odd and greater than 1, the top rows are:

  ____
__|__|

---

The following rows are:

|__|__|

until the number of instances of |__| is the same as the input

Answer 1

Haskell, 101 bytes

Haskell has never been great for code golfing...

b="\n|__|__|"
h="   ____\n "
f 1=h++"  |__|"
f 2="_______"++b
f 3=h++"__|__|"++b
f n=f(n-2)++b
f _=""

Answer 2

JavaScript ES6, 80 bytes

x=>(x%2?`   ____
 ${x<2?"  ":"__"}|__|`:x?"_______":"")+`
|__|__|`.repeat(x/2)

Uses the same technique as my Japt answer, and is surprisingly not much longer...

Answer 3

Pyth, 55 bytes

K"|__|"IQ>7<*3%Q2r"3 7_"9?tQjb+XW%Q2J+KtKZd*/tQ2]J+*3dK

Try it online. Test suite.

This is really quick and dirty, written on my phone. Will get to more golfing later.

Answer 4

C, 104 102 bytes

f(x){x?x%2?printf("   ____\n%3s|__|\n",x<2?"":"__"):puts("_______"):0;for(x/=2;x>0;x--)puts("|__|__|");}

Maybe I can use some printf trickery to improve this...
Apparently I can

Answer 5

𝔼𝕊𝕄𝕚𝕟, 53 chars / 67 bytes

ï%2?`   ⟮__⟯Ⅰ
 ⦃ï<2?⍞  :⍞Ⅰ⦄|Ⅰ|`:ï?⍘_ď7:⬯⦄
|Ⅰ|Ⅰ|`ď ï/2

Try it here (Firefox only).

This is quite similar to the Javascript ES6 answer, even though I found it independently. Explanation to come when I finish golfing.

Answer 6

PHP, 134 chars

<?$i=$argv[1];if($i>0){echo($i%2===0?"_______\n|__":"   ____\n".($i>1?"___":"   "))."|__|\n";echo str_repeat("|__|__|\n",($i-1)/2);}?>

Notes:

• PHP was not built for code golfing
• I sure had FUN making this snippet
• It throws an error if argv is undefined
• Any help to short it is appreciated.

Answer 7

Retina, 69 bytes

r`(1?)1
$1__|__|¶
^__(?=\D{5}$)

^.
$0____¶ $0
^\D

^1
___
 ?1
|

Takes input in unary.

Try it online here.

Answer 8

Japt, 60 57 bytes

U%2?[S³'_²²RSU¥1?S²:'_²"|__|"]¬:U?'_p7 :P +"
|__|__|"pU/2

Just a basic answer. Can probably be improved. Test it online!