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Add ability to pass arguments to dvisvgm through engine.opts (fixes #2038) #2039

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Aug 28, 2021
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Add ability to pass arguments to dvisvgm through engine.opts (fixes #2038) #2039

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daa2eb8
Add ability to pass additional arguments to dvisvgm through engine.op…
andrewheiss Aug 28, 2021
ed8bb84
Added dvisvgm.opts details
andrewheiss Aug 28, 2021
8dc3ca5
oof, tiny typo
andrewheiss Aug 28, 2021
488a27f
cosmetic
yihui Aug 28, 2021
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2 changes: 2 additions & 0 deletions NEWS.md
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Expand Up @@ -6,6 +6,8 @@

- For the `tikz` engine, the class options of the `standalone` document classs can be specified via the chunk option `engine.opts$classoption` (thanks, @XiangyunHuang, #1985). The default value is `tikz`, i.e., `\documentclass[tikz]{standalone}` is used by default.

- Added the ability to pass additional arguments to `dvisvgm` when using the `tikz` engine with `fig.ext = "svg"` by using `dvisvgm.opts` in `engine.opts` (thanks, @andrewheiss, #2039). Recent versions of `dvisvgm` now allow you to embed fonts into SVG files as base64-encoded WOFF files, so `tikz` chunks can embed fonts using like so: ```` ```{tikz, fig.ext="svg", engine.opts=list(dvisvgm.opts = "--font-format=woff")}````.

- Added a new `targets` engine (https://github.com/ropensci/targets/issues/503, @wlandau). Details: https://books.ropensci.org/targets/markdown.html.

- The [chunk option `cache.globals`](https://yihui.org/knitr/options/) can take values `TRUE` and `FALSE` now (in addition to a character vector). When `FALSE`, it tries to find all symbols in the code chunk, no matter if they are local or global variables. When `NULL` or `TRUE`, it tries to find all global variables (thanks, @knokknok, #1898).
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5 changes: 3 additions & 2 deletions R/engine.R
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Expand Up @@ -306,8 +306,9 @@ eng_tikz = function(options) {
# dvisvgm needs to be on the path
# dvisvgm for windows needs ghostscript bin dir on the path also
if (Sys.which('dvisvgm') == '') tinytex::tlmgr_install('dvisvgm')
if (system2('dvisvgm', c('-o', shQuote(fig2), fig)) != 0)
stop('Failed to compile ', fig, ' to ', fig2)
if (system2('dvisvgm', c(
options$engine.opts$dvisvgm.opts, '-o', shQuote(fig2), fig
)) != 0) stop('Failed to compile ', fig, ' to ', fig2)
} else {
# convert to the desired output-format using magick
if (ext != 'pdf') magick::image_write(do.call(magick::image_convert, c(
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