Support knitr.svg.object in Quarto

[brianmsm]

I am not sure if this corresponds to knitr. I saw this implementation (https://github.com/yihui/knitr/issues/2152) and thought it was fantastic because it's something I've been looking for a long time. In rmarkdown it works fine, but the rendering in quarto, not anymore by setting the self-contained to true or false.

---
title: "test4"
format:
  html: 
    self-contained: false
    keep-md: true
---

```{r setup, echo=FALSE}
knitr::opts_chunk$set(fig.path = "fig2/", dev = "gridSVG")
options(knitr.svg.object = TRUE)

Plot test

library(ggplot2)
ggplot(mpg, aes(class)) + geom_bar()

This is the result of the compiled md:

````md
---
title: "test4"
format:
  html: 
    self-contained: false
    keep-md: true
---

::: {.cell}

:::

# Plot test

::: {.cell}

```{.r .cell-code}
library(ggplot2)
ggplot(mpg, aes(class)) + geom_bar()

::: {.cell-output-display} {width=672} ::: :::

<details style="margin-bottom:10px;">
<summary>
SVG file
</summary>

```svg
<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="504px" height="360px" viewBox="0 0 504 360" version="1.1">
  <metadata xmlns:gridsvg="http://www.stat.auckland.ac.nz/~paul/R/gridSVG/">
    <gridsvg:generator name="gridSVG" version="1.7-5" time="2023-08-08 15:09:30.277402"/>
    <gridsvg:argument name="name" value="fig2/unnamed-chunk-1-1.svg~"/>
    <gridsvg:argument name="exportCoords" value="none"/>
    <gridsvg:argument name="exportMappings" value="none"/>
    <gridsvg:argument name="exportJS" value="none"/>
    <gridsvg:argument name="res" value="72"/>
    <gridsvg:argument name="prefix" value=""/>
    <gridsvg:argument name="addClasses" value="FALSE"/>
    <gridsvg:argument name="indent" value="TRUE"/>
    <gridsvg:argument name="htmlWrapper" value="FALSE"/>
    <gridsvg:argument name="usePaths" value="vpPaths"/>
    <gridsvg:argument name="uniqueNames" value="TRUE"/>
    <gridsvg:separator name="id.sep" value="."/>
    <gridsvg:separator name="gPath.sep" value="::"/>
    <gridsvg:separator name="vpPath.sep" value="::"/>
  </metadata>
  <g transform="translate(0, 360) scale(1, -1)">
    <g id="gridSVG" fill="rgb(255,255,255)" stroke="rgb(0,0,0)" stroke-dasharray="none" stroke-width="0.75" font-size="12" font-family="Helvetica, Arial, FreeSans, Liberation Sans, Nimbus Sans L, sans-serif" opacity="1" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="10" stroke-opacity="1" fill-opacity="1" font-weight="normal" font-style="normal">
      <g id="layout.1">
        <g id="layout.2">
          <defs>
            <clipPath id="layout::background.1-9-12-1.1.clipPath">
              <rect x="0" y="0" width="504" height="360" fill="none" stroke="none"/>
            </clipPath>
          </defs>
          <g id="layout::background.1-9-12-1.1" clip-path="url(#layout::background.1-9-12-1.1.clipPath)">
            <g id="background.1-9-12-1.1">
              <g id="plot.background..rect.37.1">
                <rect id="plot.background..rect.37.1.1" x="0" y="0" width="504" height="360" transform="" stroke-width="1.07" stroke="rgb(255,255,255)" fill="rgb(255,255,255)" stroke-dasharray="none" stroke-opacity="1" fill-opacity="1"/>
              </g>
            </g>
          </g>
          <defs>
            <clipPath id="layout::panel.7-5-7-5.1.clipPath">
              <rect x="34.57" y="33.55" width="463.95" height="320.97" fill="none" stroke="none"/>
            </clipPath>
          </defs>
          <g id="layout::panel.7-5-7-5.1" clip-path="url(#layout::panel.7-5-7-5.1.clipPath)">
            <g id="panel.7-5-7-5.1">
              <g id="panel-1.gTree.15.1">
                <g id="grill.gTree.13.1">
                  <g id="panel.background..rect.6.1">
                    <rect id="panel.background..rect.6.1.1" x="34.57" y="33.55" width="463.95" height="320.97" transform="" stroke-width="1.07" stroke="none" fill="rgb(235,235,235)" stroke-dasharray="none" stroke-opacity="0" fill-opacity="1"/>
                  </g>
                  <g id="panel.grid.minor.y..polyline.8.1">
                    <polyline id="panel.grid.minor.y..polyline.8.1.1" points="34.57,95.2 498.52,95.2" stroke="rgb(255,255,255)" fill="none" stroke-width="0.53" stroke-dasharray="none" stroke-linecap="butt" stroke-opacity="1" fill-opacity="1"/>
                    <polyline id="panel.grid.minor.y..polyline.8.1.2" points="34.57,189.33 498.52,189.33" stroke="rgb(255,255,255)" fill="none" stroke-width="0.53" stroke-dasharray="none" stroke-linecap="butt" stroke-opacity="1" fill-opacity="1"/>
                    <polyline id="panel.grid.minor.y..polyline.8.1.3" points="34.57,283.46 498.52,283.46" stroke="rgb(255,255,255)" fill="none" stroke-width="0.53" stroke-dasharray="none" stroke-linecap="butt" stroke-opacity="1" fill-opacity="1"/>
                  </g>
                  <g id="panel.grid.major.y..polyline.10.1">
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                    <polyline id="panel.grid.major.y..polyline.10.1.2" points="34.57,142.27 498.52,142.27" stroke="rgb(255,255,255)" fill="none" stroke-width="1.07" stroke-dasharray="none" stroke-linecap="butt" stroke-opacity="1" fill-opacity="1"/>
                    <polyline id="panel.grid.major.y..polyline.10.1.3" points="34.57,236.39 498.52,236.39" stroke="rgb(255,255,255)" fill="none" stroke-width="1.07" stroke-dasharray="none" stroke-linecap="butt" stroke-opacity="1" fill-opacity="1"/>
                    <polyline id="panel.grid.major.y..polyline.10.1.4" points="34.57,330.52 498.52,330.52" stroke="rgb(255,255,255)" fill="none" stroke-width="1.07" stroke-dasharray="none" stroke-linecap="butt" stroke-opacity="1" fill-opacity="1"/>
                  </g>
                  <g id="panel.grid.major.x..polyline.12.1">
                    <polyline id="panel.grid.major.x..polyline.12.1.1" points="73.23,33.55 73.23,354.52" stroke="rgb(255,255,255)" fill="none" stroke-width="1.07" stroke-dasharray="none" stroke-linecap="butt" stroke-opacity="1" fill-opacity="1"/>
                    <polyline id="panel.grid.major.x..polyline.12.1.2" points="137.67,33.55 137.67,354.52" stroke="rgb(255,255,255)" fill="none" stroke-width="1.07" stroke-dasharray="none" stroke-linecap="butt" stroke-opacity="1" fill-opacity="1"/>
                    <polyline id="panel.grid.major.x..polyline.12.1.3" points="202.11,33.55 202.11,354.52" stroke="rgb(255,255,255)" fill="none" stroke-width="1.07" stroke-dasharray="none" stroke-linecap="butt" stroke-opacity="1" fill-opacity="1"/>
                    <polyline id="panel.grid.major.x..polyline.12.1.4" points="266.55,33.55 266.55,354.52" stroke="rgb(255,255,255)" fill="none" stroke-width="1.07" stroke-dasharray="none" stroke-linecap="butt" stroke-opacity="1" fill-opacity="1"/>
                    <polyline id="panel.grid.major.x..polyline.12.1.5" points="330.98,33.55 330.98,354.52" stroke="rgb(255,255,255)" fill="none" stroke-width="1.07" stroke-dasharray="none" stroke-linecap="butt" stroke-opacity="1" fill-opacity="1"/>
                    <polyline id="panel.grid.major.x..polyline.12.1.6" points="395.42,33.55 395.42,354.52" stroke="rgb(255,255,255)" fill="none" stroke-width="1.07" stroke-dasharray="none" stroke-linecap="butt" stroke-opacity="1" fill-opacity="1"/>
                    <polyline id="panel.grid.major.x..polyline.12.1.7" points="459.86,33.55 459.86,354.52" stroke="rgb(255,255,255)" fill="none" stroke-width="1.07" stroke-dasharray="none" stroke-linecap="butt" stroke-opacity="1" fill-opacity="1"/>
                  </g>
                </g>
                <g id="geom_rect.rect.2.1">
                  <rect id="geom_rect.rect.2.1.1" x="44.24" y="48.14" width="57.99" height="23.53" transform="" stroke="none" fill="rgb(89,89,89)" stroke-width="1.07" stroke-dasharray="none" stroke-linejoin="miter" stroke-linecap="butt" stroke-opacity="0" fill-opacity="1"/>
                  <rect id="geom_rect.rect.2.1.2" x="108.67" y="48.14" width="57.99" height="221.2" transform="" stroke="none" fill="rgb(89,89,89)" stroke-width="1.07" stroke-dasharray="none" stroke-linejoin="miter" stroke-linecap="butt" stroke-opacity="0" fill-opacity="1"/>
                  <rect id="geom_rect.rect.2.1.3" x="173.11" y="48.14" width="57.99" height="192.96" transform="" stroke="none" fill="rgb(89,89,89)" stroke-width="1.07" stroke-dasharray="none" stroke-linejoin="miter" stroke-linecap="butt" stroke-opacity="0" fill-opacity="1"/>
                  <rect id="geom_rect.rect.2.1.4" x="237.55" y="48.14" width="57.99" height="51.77" transform="" stroke="none" fill="rgb(89,89,89)" stroke-width="1.07" stroke-dasharray="none" stroke-linejoin="miter" stroke-linecap="butt" stroke-opacity="0" fill-opacity="1"/>
                  <rect id="geom_rect.rect.2.1.5" x="301.99" y="48.14" width="57.99" height="155.31" transform="" stroke="none" fill="rgb(89,89,89)" stroke-width="1.07" stroke-dasharray="none" stroke-linejoin="miter" stroke-linecap="butt" stroke-opacity="0" fill-opacity="1"/>
                  <rect id="geom_rect.rect.2.1.6" x="366.42" y="48.14" width="57.99" height="164.72" transform="" stroke="none" fill="rgb(89,89,89)" stroke-width="1.07" stroke-dasharray="none" stroke-linejoin="miter" stroke-linecap="butt" stroke-opacity="0" fill-opacity="1"/>
                  <rect id="geom_rect.rect.2.1.7" x="430.86" y="48.14" width="57.99" height="291.79" transform="" stroke="none" fill="rgb(89,89,89)" stroke-width="1.07" stroke-dasharray="none" stroke-linejoin="miter" stroke-linecap="butt" stroke-opacity="0" fill-opacity="1"/>
                </g>
              </g>
            </g>
          </g>
          <g id="layout::spacer.8-6-8-6.1">
            <g id="spacer.8-6-8-6.1"/>
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                    <g id="axis.1">
                      <g id="layout::axis-l.7-4-7-4::GRID.VP.6::axis::axis.1-1-1-1.1">
                        <g id="axis.1-1-1-1.1">
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                                        <tspan id="GRID.text.16.1.6.tspan.1" dy="7" x="0">subcompact</tspan>
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                                    </g>
                                  </g>
                                  <g id="GRID.text.16.1.7" transform="translate(459.86, 28.62)" stroke-width="0.1">
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                                        <tspan id="GRID.text.16.1.7.tspan.1" dy="7" x="0">suv</tspan>
                                      </text>
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                <g id="layout::xlab-b.9-5-9-5::GRID.VP.7::GRID.VP.8.1">
                  <g id="axis.title.x.bottom..titleGrob.28.1">
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                            <tspan id="GRID.text.25.1.1.tspan.1" dy="9" x="0">class</tspan>
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          <g id="layout::ylab-r.7-7-7-7.1">
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> xfun::session_info('knitr')
R version 4.3.1 (2023-06-16)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Garuda Linux, RStudio 2023.6.1.524

Locale:
  LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C               LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8     LC_MONETARY=en_US.UTF-8   
  LC_MESSAGES=en_US.UTF-8    LC_PAPER=en_US.UTF-8       LC_NAME=C                  LC_ADDRESS=C               LC_TELEPHONE=C            
  LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

time zone: America/Lima
tzcode source: system (glibc)

Package version:
  evaluate_0.21   graphics_4.3.1  grDevices_4.3.1 highr_0.10      knitr_1.43.2    methods_4.3.1   stats_4.3.1     tools_4.3.1    
  utils_4.3.1     xfun_0.39       yaml_2.3.7 

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[cderv]

Thanks for the report @brianmsm !

This would be a feature request for Quarto. As of now, Quarto is overriding the knitr's plot hooks to only output markdown syntax to include images, and let Pandoc and internal Quarto handling to create the right outputs. That is why you see

![](fig/unnamed-chunk-1-1.svg){width=672}

Then it seems nor Quarto or Pandoc does insertion of svg using <object>

@JooYoungseo you were the one requesting #2152 and helping with <object> inclusion. Did you already report this improvment on the Quarto side ? Are you aware of current Quarto limitation on that matter ?

We may need to work on this together for Quarto. What do you think ?

[cderv]

FWIW it was discussed in Pandoc at

• https://github.com/jgm/pandoc/issues/7906

and they recommend Lua filter to use <object> for svg image, so I think we can do that in Quarto.

[cderv]

I have open

• https://github.com/quarto-dev/quarto-cli/issues/6581

so I'll close this here.

Thanks !

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