texPreview comes with LaTeX packages built in for each render, but the user can add any TeX library that they have installed on the machine using build_usepackage. This object can then be used in the usrPackages parameter in tex_preview.
## [1] "\\usepackage[usenames]{xcolor}"geom.opts=c('paperwidth=35cm','paperheight=35cm','left=2.5cm','top=2.5cm')
use.opts="\\usetikzlibrary{mindmap,backgrounds}"
m <- mapply(
FUN = build_usepackage,
pkg = list('times','geometry','tikz'),
options = list(NULL ,geom.opts ,NULL),
uselibrary = list(NULL ,NULL ,use.opts)
)
unlist(m)## [1] "\\usepackage{times}"
## [2] "\\usepackage[paperwidth=35cm,paperheight=35cm,left=2.5cm,top=2.5cm]{geometry}"
## [3] "\\usepackage{tikz}"
## [4] "\\usetikzlibrary{mindmap,backgrounds}"
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