carriage return in strwrap in R - r

Question

I'm having trouble figuring out how to modify my input text in order to get strwrap to start a new line at a given place without an extra line in between (a paragraph break).
My desired output:
Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Vivamus malesuada ante eget lacus aliquam aliquet. Morbi a
nulla in tortor rutrum pulvinar.
Duis auctor condimentum magna ac commodo. Phasellus quis
elementum purus, at ornare magna. Quisque sit amet vehicula
risus. Suspendisse et et scelerisque velit:
item #1
item #2
item #3
I can use \n to get the paragraph break, which works fine, but how do I get a new line without the paragraph break, as in the list of items at the bottom? When I use \r...
txt <- "Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Vivamus malesuada ante eget lacus aliquam aliquet. Morbi a nulla
in tortor rutrum pulvinar.
\n
Duis auctor condimentum magna ac commodo. Phasellus quis elementum purus,
at ornare magna. Quisque sit amet vehicula risus. Suspendisse et
scelerisque velit:
\r
item #1
item #2
item #3"
writeLines(strwrap(txt, width=60))
... I get an unexpected result: a line break but with an extra space indent and some juxtaposition and deletion of text:
#Lorem ipsum dolor sit amet, consectetur adipiscing elit.
#Vivamus malesuada ante eget lacus aliquam aliquet. Morbi a
#nulla in tortor rutrum pulvinar.
#
#Duis auctor condimentum magna ac commodo. Phasellus quis
#elementum purus, at ornare magna. Quisque sit amet vehicula
# item #1 item #2se et scelerisque velit:
#item #3
What do I need to replace /r with in order to get a single line break, like between "velit:" and "item #1" in the desired output above? I've read the strwrap documentation and worked through its example, but haven't found the answer. Thanks for your help.

Answer 1

On the off-change that someone else finds this question in the future, I'll share the solution I used here. As Wiktor points out above, strwrap does not have this functionality. What I ended up doing was simply a workaround that edits the text after it goes through strwrap.
I add an arbitrary character sequence to the beginning of each line in the input which I want to start with a carriage return. Below I use "/r" for this. I send the input through strwrap, add two empty lines to the end, and then parse each line of the output, deleting "/r" and removing the empty preceding line (paragraph break). Here's the code:
txt <- "Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Vivamus malesuada ante eget lacus aliquam aliquet. Morbi a nulla
in tortor rutrum pulvinar.
\n
Duis auctor condimentum magna ac commodo. Phasellus quis elementum purus,
at ornare magna. Quisque sit amet vehicula risus. Suspendisse et
scelerisque velit:
\n\r item #1
\n\r item #2
\n\r item #3"
sink("output.txt")
lines <- append(strwrap(txt, width=100), c("",""), after = length(lines))
invisible(lapply(seq_along(lines), function(index) {
if (index != 1) { #skip first line
if (!grepl("\r ", lines[index])) {
writeLines(gsub("\r ", "", lines[index-1]))
}
}
}))
sink()
This produces a .txt file with the output text formatted as desired, where the list of items at the bottom is separated by carriage returns/newlines but paragraph breaks marked in the input with just "/n" are treated normally.