R Under development (unstable) (2024-01-28 r85838 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> library("R.rsp")
R.rsp v0.46.0 successfully loaded. See ?R.rsp for help.
> 
> ## Report template
> report <- function() {
+   cat("Report:\n")
+   cat(sprintf("a=%g\n", a))
+   cat("------\n")
+ } # report()
> 
> 
> ## 1. Generate report()
> a <- 1
> s <- rstring(report)
> cat(s)
Report:
a=1
------
> a <- 2
> rcat(report)
Report:
a=2
------
> a <- 3
> dummy <- rfile(report, output="")
Report:
a=3
------
> 
> 
> ## 2. Generate report() in custom environment
> env <- new.env()
> env$a <- 1
> s <- rstring(report, envir=env)
> cat(s)
Report:
a=1
------
> 
> env$a <- 2
> rcat(report, envir=env)
Report:
a=2
------
> 
> env$a <- 3
> dummy <- rfile(report, output="", envir=env)
Report:
a=3
------
> 
> 
> 
> ## 3. Generate report() within another function
> foo <- function() {
+   a <- 1
+   s <- rstring(report)
+   cat(s)
+   a <- 2
+   rcat(report)
+   a <- 3
+   dummy <- rfile(report, output="")
+ } # foo()
> 
> foo()
Report:
a=1
------
Report:
a=2
------
Report:
a=3
------
> 
> proc.time()
   user  system elapsed 
   0.46    0.18    0.64