Merge pull request #210 from cderv/fix/knitr-breakage

Fix knitr 1.44 breakage by unlocking opts_current before modifyfing it

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: JuliaCall
 Type: Package
 Title: Seamless Integration Between R and 'Julia'
-Version: 0.17.5
+Version: 0.17.5.9000
 Date: 2022-09-08
 Authors@R: c(
     person("Changcheng", "Li", , "[email protected]", c("aut", "cre")),

NEWS.md

@@ -1,3 +1,7 @@
+# JuliaCall 0.17.5.9000
+
+* Fix breakage with **knitr** 1.44 when using Plots in a `julia` chunk ([#209](https://github.com/Non-Contradiction/JuliaCall/issues/209)).
+
 # JuliaCall 0.17.5
 
 * Nineteenth release on CRAN.

R/RMarkdown.R

@@ -55,7 +55,12 @@ begin_plot <- function(){
 
 ## This function is used by Julia plot_display function
 finish_plot <- function(){
+    ## FIXME: opts_current is supposed to be read-only
+    ## so it require unlock to be modified since knitr 1.44
+    ## https://yihui.org/en/2023/09/knitr-1-44/
+    knitr::opts_current$lock(FALSE)
     knitr::opts_current$set(Jfig.cur = .julia$pending_plot_number + 1L)
+    knitr::opts_current$lock(TRUE)
     julia$current_plot <- .julia$pending_plot
 }