texshop knitr - XeLaTeX engine

Question

In TeXShop, my current knitr engine is
#!/bin/bash
export PATH=$PATH:/usr/texbin:/usr/local/bin
Rscript -e "library(knitr); knit('$1')"
latexmk -pdf "${1%.*}"

My current XeLaTeX engine is
#!/bin/tcsh

set path= ($path /Library/TeX/texbin /usr/texbin /usr/local/bin)
xelatex  -file-line-error -synctex=1 "$1"

How do I replace latexmk with an equivalent xelatex command in the knitr engine?
The current default shell in MacOS is zsh. Could the response  to 1 include a modification for zsh.

Alex Watson · Answer

I suggest you might want to keep latexmk, to make sure the document is fully compiled. If you create a latexmkrc file in your working directory containing
$pdf_mode = 1;
$pdflatex = 'xelatex -file-line-error -synctex=1 %O %S';

then latexmk will use the invocation there, and you can even remove "-pdf" from the call.
(%O stands for latexmk options, e.g. if you set $recorder = 1, then -recorder will be added here; %S stands for the file name.)
You could also set this using the -pdflatex switch to latexmk.

texshop knitr -> XeLaTeX engine

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