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<!--
%\VignetteEngine{knitr::docco_classic}
%\VignetteIndexEntry{Customization of the highr package}
-->
# Customization of the `highr` package
If you are not satisfied with the default syntax highlighting commands in
the **highr** package, you can just use your own tags/commands. In this
vignette, we show a brief example.
The default highlighting commands are stored in two internal data frames
`cmd_latex` and `cmd_html`:
```{r}
library(highr)
highr:::cmd_latex
```
This data frame is passed to the `markup` argument in `hilight()`, so we are
free to pass a modified version there. Suppose I want to use the command
`\my<*>` instead of `\hl<*>`:
```{r}
m = highr:::cmd_latex
m[, 1] = sub('\\hl', '\\my', m[, 1], fixed = TRUE)
head(m)
```
Then
```{r}
hilight("x = 1+1 # a comment") # default markup
hilight("x = 1+1 # a comment", markup = m) # custom markup
```
This allows one to use arbitrary commands around the text symbols in the R
code. See <https://github.com/yihui/highr/blob/master/R/highlight.R> for how
`cmd_latex` and `cmd_html` were generated in **highr**.
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