resolve more 301 redirects

NEWS.md

@@ -472,7 +472,7 @@
 
 - added a helper function `all_rcpp_labels()`, which is simply `all_labels(engine == 'Rcpp')` and can be used to extract all chunk labels 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)
+- 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 https://rmarkdown.rstudio.com/authoring_knitr_engines.html for details (#1241)
 
 - `fig.keep` now accepts numeric values to index low-level plots to keep (#1265)
 
@@ -881,7 +881,7 @@
 
 - for Markdown tables, `kable()` gained a new argument `padding` to specify the inner padding of table cells using spaces (thanks, @gavril0, #699)
 
-- added a new vignette engine called `rmarkdown`, which uses `rmarkdown::render()` to create a package vignette from an R Markdown document; see http://rmarkdown.rstudio.com for more information about the **rmarkdown** package, and the vignette `knit_print.Rmd` in **knitr** for an example (basically you specify `\VignetteEngine{knitr::rmarkdown}` in your vignette)
+- added a new vignette engine called `rmarkdown`, which uses `rmarkdown::render()` to create a package vignette from an R Markdown document; see https://rmarkdown.rstudio.com for more information about the **rmarkdown** package, and the vignette `knit_print.Rmd` in **knitr** for an example (basically you specify `\VignetteEngine{knitr::rmarkdown}` in your vignette)
 
 - indentation is preserved when using chunk references `<<>>`, i.e., if `<<>>` is indented, the spaces before it will be applied to the code that it refers to (thanks, Terry Therneau)
 

R/pandoc.R

@@ -37,7 +37,7 @@
 #' @references Pandoc: \url{https://pandoc.org}; Examples and rules of the
 #'   configurations: \url{https://yihui.org/knitr/demo/pandoc/}
 #'
-#'   Also see R Markdown (v2) at \url{http://rmarkdown.rstudio.com}. The
+#'   Also see R Markdown (v2) at \url{https://rmarkdown.rstudio.com}. The
 #'   \pkg{rmarkdown} package has several convenience functions and templates
 #'   that make it very easy to use Pandoc. The RStudio IDE also has
 #'   comprehensive support for it, so I'd recommend users who are not familiar

R/themes.R

@@ -33,7 +33,7 @@ get_theme = function(theme = NULL) {
 #' @note The syntax highlighting here only applies to \file{.Rnw} (LaTeX) and
 #'   \file{.Rhtml} (HTML) documents, and it does not work for other types of
 #'   documents, such as \file{.Rmd} (R Markdown, which has its own syntax
-#'   highlighting themes; see \url{http://rmarkdown.rstudio.com}).
+#'   highlighting themes; see \url{https://rmarkdown.rstudio.com}).
 #' @export
 #' @examples opts_knit$set(out.format='latex'); knit_theme$set('edit-vim')
 #'

inst/examples/knitr-manual.bib

@@ -16,5 +16,5 @@ @book{xie2013
   year = {2015},
   edition = {2nd},
   note = {ISBN 978-1498716963},
-  url = {http://yihui.org/knitr/}
+  url = {https://yihui.org/knitr/}
 }

inst/examples/knitr-packages.bib

@@ -62,7 +62,7 @@ @Manual{R-knitr
   author = {Yihui Xie},
   year = {2016},
   note = {R package version 1.15},
-  url = {http://yihui.org/knitr/},
+  url = {https://yihui.org/knitr/},
 }
 @Manual{R-MASS,
   title = {MASS: Support Functions and Datasets for Venables and Ripley's MASS},

vignettes/knitr-markdown.Rmd

@@ -8,7 +8,7 @@ library(knitr)
 
 This is an example of Markdown vignettes in R. Before R 3.0.0, only Sweave/PDF vignettes were supported in R. Markdown is gaining popularity over the years due to its simplicity, and R 3.0.0 starts to support package vignettes written in R Markdown.
 
-> Please note this example is for [R Markdown v1](http://rmarkdown.rstudio.com/authoring_migrating_from_v1.html) only. If you use [R Markdown v2](http://rmarkdown.rstudio.com/), you should use the vignette engine `knitr::rmarkdown` instead of `knitr::knitr`.
+> Please note this example is for [R Markdown v1](https://rmarkdown.rstudio.com/authoring_migrating_from_v1.html) only. If you use [R Markdown v2](https://rmarkdown.rstudio.com/), you should use the vignette engine `knitr::rmarkdown` instead of `knitr::knitr`.
 
 ## Package vignettes