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knitr 1.32
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@yihui yihui released this 14 Apr 15:06
· 445 commits to master since this release
v1.32
62c7b4a

NEW FEATURES

  • The chunk option ref.label can be used to reuse code from other code chunks in the current code chunk. Now it can also accept a character vector of chunk labels wrapped in I() so that the chunk options of other code chunks can also be applied to the current chunk. For example, if we have a chunk ```{r, chunk-a, echo=FALSE, results='asis'}, the chunk ```{r, chunk-b, ref.label=I('chunk-a')} will inherit both the code and chunk options from chunk-a (e.g., echo=FALSE and results='asis'), but chunk-b can still override these chunk options, e.g., the actual chunk options of ```{r, chunk-b, echo=TRUE} will be echo=TRUE and results='asis'. If you want to use one code chunk with several chunk options for multiple times, and each time you want to change a small subset of the chunk options, you may use this approach ref.label = I() to avoid typing most chunk options over and over again (thanks, @atusy, #1960).

  • The chunk option opts.label gained a new usage. It used to mean labels in knitr::opts_template (see the help page if you are not familiar with this object). Now it can also be used to specify the labels of other code chunks, from which the chunk options are to be inherited to the current chunk. For example, ```{r, chunk-b, opts.label='chunk-a'} means that chunk-b will inherit chunk options from chunk-a. Local chunk options in a chunk (if exist) will override inherited options. For the new features about both chunk options ref.label and opts.label, see the detailed documentation and examples at https://yihui.org/knitr/options/ (thanks, @atusy, #1960).

  • The internal code to process R code chunks was factored out into the language engine R, which can be obtained via knit_engines$get('R') now (thanks, @abhsarma, #1963).

  • Added arguments dir and envir to load_cache() to specify the working directory and environment into which the cached objects are loaded. By default, all cached objects are loaded into the global environment, which may not be desirable (thanks, @LTLA, #1905).

  • The internal function html_screenshot(), which takes screenshots of HTML widgets and Shiny apps in knitr documents, now prefers the webshot2 package over the webshot package. This is because the backend of the webshot package is PhantomJS, which has been archived since 2018. If webshot is still preferred, use the chunk option opts_chunk$set(webshot = "webshot") (thanks, @atusy #1918, @LouisStAmour #1858).

  • Added a new engine, bslib, which is a special scss/sass engine for writing Sass code that wants to leverage Bootstrap Sass. It's primarily designed to work with rmarkdown::html_document_base's theme parameter (when it represents a bslib::bs_theme()), but the engine can be used anywhere a bslib::bs_theme() is set globally with bslib::bs_global_set() (thanks, @cpsievert, #1666).

  • When the chunk option include = FALSE, error = TRUE used to be ignored, i.e., errors are signaled nonetheless (causing the knitting process to fail). To avoid this problem, you can now use the numeric value error = 0 so that knitr will not check the include option, i.e., knitting will not fail even if include = FALSE and an error has occurred in a code chunk, which you wouldn't notice (thanks, @rundel, #1914).

  • When processing package vignettes that require rmarkdown or markdown, we now check that it is declared as a package dependency in the DESCRIPTION file (thanks, @dmurdoch, #1919).

  • For tikz code chunks, a new option engine.opts$extra.preamble allows arbitrary LaTeX code to be inserted into the preamble of the template. This allows loading of additional LaTeX and tikz libraries without having to recreate a template from scratch (thanks, @krivit, #1886).

BUG FIXES

  • Fixed an issue where code source and results would not show when using a numeric vector in fig.keep to select all plots (thanks, @dongzhuoer @ajrgodfrey #1579, @cderv #1955).

  • Graphical parameter par(col =) is now preserved as expected in following chunks when knitr::opts_knit$set(global.par = TRUE) (thanks, @arnonl, @RolandASc, #1603).

  • Fixed an issue with kable(format = "latex", booktabs = TRUE) when the first cell of the table stats with [ (thanks, @jonnypenarth, #1595).

  • For child documents, include_graphics(error = FALSE) is the default now (#1957).

  • For Rnw documents, the commented %\begin{document} will no longer cause trouble (thanks, @NewbieKnitter @shrektan, #1819).

  • Fixed an issue with the chunk option fig.alt causing figures to disappear in rmarkdown::word_document() output. This option is currently supported for HTML output only. If provided for office output in rmarkdown, it will emit a warning and be ignored (#1966).

  • Spaces in messages were not properly escaped in .Rnw documents (thanks, @elbersb, #1978).

  • The hook hook_pdfcrop() did not crop figures generated by the tikz or dot engine (thanks, @giabaio yihui/xaringan#285, @cderv #1923).

MINOR CHANGES

  • For Rnw documents, if a chunk's output ends with \n, knitr will no longer add another \n to it (thanks, @krivit #1958, @jpritikin 1092).

  • For kable(x, format = 'simple'), it no longer generates a pipe table but a simple table instead when x has only one column (thanks, @alusiani, #1968). For kable(x, format = 'pipe'), it no longer warns when x has no column names, but just generate an empty table header.

  • For tikz code chunks, the default LaTeX template uses \documentclass[tikz]{standalone} instead of \documentclass{article} and \usepackage{preview} now (thanks, @XiangyunHuang, #1985).

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