(Note: This is my first ever code golf question, but as far as I can tell, nobody else has done exactly this, so I should be good.)

Your task is to make a program or function that takes in a string s and an integer n, and returns or outputs that text wrapped into multiple lines. Each word must be wholly on a line; i.e. no words split in the middle.

Example:

s = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed eget erat lectus. Morbi mi mi, fringilla sed suscipit ullamcorper, tristique at mauris. Morbi non commodo nibh. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Sed at iaculis mauris. Praesent a sem augue. Nulla lectus sapien, auctor nec pharetra eu, tincidunt ac diam. Sed ligula arcu, aliquam quis velit aliquam, dictum varius erat." 

n = 50



output:

Lorem ipsum dolor sit amet, consectetur adipiscing

elit. Sed eget erat lectus. Morbi mi mi, fringilla

sed suscipit ullamcorper, tristique at mauris.

Morbi non commodo nibh. Pellentesque habitant

morbi tristique senectus et netus et malesuada

fames ac turpis egestas. Sed at iaculis mauris.

Praesent a sem augue. Nulla lectus sapien, auctor

nec pharetra eu, tincidunt ac diam. Sed ligula

arcu, aliquam quis velit aliquam, dictum varius

erat.

Your output can be an array of strings or a single string with line breaks. Also, you can assume n will be above 10, so don't worry about dealing with weird cases.

Standard I/O rules apply, and standard loopholes are prohibited.

Since this is code-golf, the shortes solution in bytes wins.

Here is an example program in Python that would work.

Vim, 15 bytes/keystrokes

DJ:se tw=<C-r>"

gq_

A text formatting question? I know just the tool for the job! And it even has my name in the first two keystrokes :D

<C-r> means ctrl-r.

This could ever so slightly shorter in V, but I prefer answering in vanilla vim for answers that really show off how concise vim can be for the right challenge. And the difference is so small anyway.

This could also be the following for 15 bytes as well:

:se tw=<C-r><C-w>

ddgq_

Try it online!

JavaScript (ES6), 75 bytes

Takes input as (string)(n).

s=>n=>s.split` `.map(w=>(r+w)[n-1]?(o+=r+`

`,r=w):r+=r?' '+w:w,o=r='')&&o+r

Try it online!

JavaScript + HTML + CSS, 117 bytes

n=50

s="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed eget erat lectus. Morbi mi mi, fringilla sed suscipit ullamcorper, tristique at mauris. Morbi non commodo nibh. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Sed at iaculis mauris. Praesent a sem augue. Nulla lectus sapien, auctor nec pharetra eu, tincidunt ac diam. Sed ligula arcu, aliquam quis velit aliquam, dictum varius erat."

f=(n,s)=>document.body.innerHTML+=`<p style='width:calc(10px*${n}*.60);font-family:monospace;font-size:10px;'>${s}</p>`

f(n,s)

Bash, 7 bytes

fmt -$n

Input taken from stdin, line width stored in a variable n (is this allowed?).

This gives the correct answer on my Mac:

$ echo "$s" | fmt -$n

Lorem ipsum dolor sit amet, consectetur adipiscing

elit. Sed eget erat lectus. Morbi mi mi, fringilla

sed suscipit ullamcorper, tristique at mauris.

Morbi non commodo nibh. Pellentesque habitant

morbi tristique senectus et netus et malesuada

fames ac turpis egestas. Sed at iaculis mauris.

Praesent a sem augue. Nulla lectus sapien, auctor

nec pharetra eu, tincidunt ac diam. Sed ligula

arcu, aliquam quis velit aliquam, dictum varius

erat.

But a slightly wrong one on TIO (not sure why):

Try it online!