---
title: "Supported LaTeX commands"
author: "Stefano Meschiari"
date: "`r Sys.Date()`"
output: rmarkdown::html_vignette
vignette: >
  %\VignetteIndexEntry{Supported LaTeX commands}
  %\VignetteEngine{knitr::rmarkdown}
  %\VignetteEncoding{UTF-8}
---

```{r, setup, message=FALSE, echo=FALSE}
library(latex2exp)
library(reactable)
library(purrr)
library(dplyr)
library(htmltools)
```

```{r, echo=FALSE}
# Saves the plot to PNG and embeds it in an <img> tag using base64 data.
# from https://stackoverflow.com/questions/50244709/how-to-store-r-ggplot-graph-as-html-code-snippet
encodeGraphic <- function(g, ..., style = "") {
  png(tf1 <- tempfile(fileext = ".png"), ...)
  force(g)
  dev.off()  # Close the file.
  txt <- RCurl::base64Encode(readBin(tf1, "raw", file.info(tf1)[1, "size"]), "txt")
  myImage <- htmltools::img(src = sprintf("data:image/png;base64,%s", txt), style = style)
  return(myImage)
}

supported <- latex2exp_supported()

supported$category <- tools::toTitleCase(supported$category)
supported <-  filter(supported, !is.na(example))
supported$command <- supported$example
```
    
```{r, echo=FALSE}
reactable(supported,
          searchable = TRUE,
          compact = TRUE,
          pagination = FALSE,
          style = "background-color:inherit",
          columns = list(
            category = colDef("Category"),
            command = colDef("LaTeX command", cell = function(content) {
              pre(code("TeX(r\"(", strong(content), ")\")"))
            }, minWidth = 200),
            example = colDef("Example", cell = function(content, ...) {
              tryCatch({
                div(
                  div(
                    encodeGraphic(plot(TeX(content), cex = 4.25),
                                  width = 600, height = 150, 
                                  style = "max-height:70px; max-width:100%")
                  )
                )
              }, error = function(e) {
                warning("Couldn't render ", content, " because of error ", e)
              })
            })
          ))
```