Log Message:
Update to 1.15.1

Upstream changes:

CHANGES IN knitr VERSION 1.15.1

@yihui yihui released this on 23 Nov 2016 · 49 commits to master since this \ 
release
NEW FEATURES

    added a new hook function hook_pngquant() that can call pngquant to optimize \ 
PNG images (thanks, @slowkow, #1320)

BUG FIXES

    not really a knitr bug, but knit_params() should be better at dealing with \ 
multibyte characters now due to the bug fix in the yaml package viking/r-yaml#6

Downloads

    Source code (zip)
    Source code (tar.gz)

    v1.15
    b08a7bc

CHANGES IN knitr VERSION 1.15

@yihui yihui released this on 10 Nov 2016 · 63 commits to master since this \ 
release
NEW FEATURES

    NA values can be displayed using different characters (including empty \ 
strings) in kable(); you can set the option knitr.kable.NA, e.g. \ 
options(knitr.kable.NA = '') to hide NA values (#1283)
    added a fortran95 engine (thanks, @stefanedwards, #1282)
    added a block2 engine for R Markdown documents as an alternative to the \ 
block engine; it should be faster and supports arbitrary Pandoc's Markdown \ 
syntax, but it is essentially a hack; note when the output format is LaTeX/PDF, \ 
you have to define \let\BeginKnitrBlock\begin \let\EndKnitrBlock\end in the \ 
LaTeX preamble
    figure captions specified in the chunk option fig.cap are also applied to \ 
HTML widgets (thanks, @byzheng, rstudio/bookdown#118)
    when the chunk option fig.show = 'animate' and ffmpeg.format = 'gif', a GIF \ 
animation of the plots in the chunk will be generated for HTML output \ 
(https://twitter.com/thomasp85/status/785800003436421120)
    added a width argument to write_bib() so long lines in bib entries can be wrapped
    the inline syntax r#code is also supported besides r code; this can make \ 
sure the inline expression is not split when the line is wrapped (thanks, Dave \ 
Jarvis)
    provided a global R option knitr.use.cwd so users can choose to evaluate the \ 
R code chunks in the current working directory after setting \ 
options(knitr.use.cwd = TRUE); the default is to evaluate code in the directory \ 
of the input document, unless the knitr option opts_knit$set(root.dir = ...) has \ 
been set
    if options(knitr.digits.signif = TRUE), numbers from inline expressions will \ 
be formatted using getOption('digits') as the number of significant digits, \ 
otherwise (the default behavior) getOption('digits') is treated as the number of \ 
decimal places (thanks, @numatt, #1053)
    the chunk option engine.path can also be a list of paths to the engine \ 
executables now, e.g., you can set knitr::opts_chunk$set(engine.path = \ 
list(python = '/anaconda/bin/python', perl = '/usr/local/bin/perl')), then when \ 
a python code chunk is executed, /anaconda/bin/python will be called instead of \ 
the system default (rstudio/rmarkdown#812)
    introduced a mechanism to protect text output in the sense that it will not \ 
be touched by Pandoc during the conversion from R Markdown to another format; \ 
this is primarily for package developers to extend R Markdown; see ?raw_output \ 
for details (which also shows new functions extract_raw_output() and \ 
restore_raw_output())

MAJOR CHANGES

    the minimal version of R required for knitr is 3.1.0 now (#1269)
    the formatR package is an optional package since the default chunk option \ 
tidy = FALSE has been there for a long time; if you use tidy = TRUE, you need to \ 
install formatR separately if it is not installed
    :set +m is no longer automatically added to haskell code chunks (#1274)

MINOR CHANGES

    the package option opts_knit$get('stop_on_error') has been removed
    the confusing warning message about knitr::knit2html() when buiding package \ 
vignettes using the knitr::rmarkdown engine without pandoc/pandoc-citeproc has \ 
been removed (#1286)
    the default value of the quiet argument of plot_crop() was changed from \ 
!opts_knit$get('progress') to TRUE, i.e., by default the messages from cropping \ 
images are suppressed

BUG FIXES

    the chunk option cache.vars did not really behave like what was documented \ 
(thanks, @simonkth, #1280)
    asis_output() should not be merged with normal character output when \ 
results='hold' (thanks, @kevinushey, #1310)

Downloads

    Source code (zip)
    Source code (tar.gz)

    v1.14
    b34be0d

CHANGES IN knitr VERSION 1.14

@yihui yihui released this on 12 Aug 2016 · 845 commits to master since this \ 
release
NEW FEATURES

    improved caching for Rcpp code chunks: the shared library built from the C++ \ 
code will be preserved on disk and reloaded the next time if caching is enabled \ 
(chunk option cache = TRUE), so that the exported R functions are still usable \ 
in later R code chunks; note this feature requires Rcpp >= 0.12.5.6 (thanks, \ 
@jjallaire, #1239)
    added a helper function all_rcpp_labels(), which is simply all_labels(engine \ 
== 'Rcpp') and can be used to extract all chunk lables of Rcpp chunks
    added a new engine named sql that uses the DBI package to execute SQL \ 
queries, and optionally assign the result to a variable in the knitr session; \ 
see http://rmarkdown.rstudio.com/authoring_knitr_engines.html for details \ 
(#1241)
    fig.keep now accepts numeric values to index low-level plots to keep (#1265)

BUG FIXES

    fixed #1211: pandoc('foo.md') generates foo_utf8.html instead of foo.html by \ 
default
    fixed #1236: include = FALSE for code chunks inside blockquotes did not work \ 
(should return > instead of a blank line) (thanks, @fmichonneau)
    fixed #1217: define the command \hlipl for syntax highlighting for Rnw \ 
documents (thanks, @conjugateprior)
    fixed #1215: restoring par() settings might fail when the plot window is \ 
partitioned, e.g. par(mfrow = c(1, 2)) (thanks, @jrwishart @jmichaelgilbert)
    fixed #1250: in the quiet mode, knit() should not emit the message \ 
"processing file ..." when processing child documents (thanks, \ 
@KZARCA)

MAJOR CHANGES

    knitr will no longer generate screenshots automatically for HTML widgets if \ 
the webshot package or PhantomJS is not installed

MINOR CHANGES

    if dev = 'cairo_pdf', the cairo_pdf device will be used to record plots \ 
(previously the pdf device was used) (#1235)
    LaTeX short captions now go up to the first ., : or ; character followed by \ 
a space or newline (thanks, @knokknok, #1249)