R Under development (unstable) (2023-11-16 r85542 ucrt) -- "Unsuffered Consequences"
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> library("R.utils")
Loading required package: R.oo
Loading required package: R.methodsS3
R.methodsS3 v1.8.2 (2022-06-13 22:00:14 UTC) successfully loaded. See ?R.methodsS3 for help.
R.oo v1.25.0 (2022-06-12 02:20:02 UTC) successfully loaded. See ?R.oo for help.

Attaching package: 'R.oo'

The following object is masked from 'package:R.methodsS3':

    throw

The following objects are masked from 'package:methods':

    getClasses, getMethods

The following objects are masked from 'package:base':

    attach, detach, load, save

R.utils v2.12.3 successfully loaded. See ?R.utils for help.

Attaching package: 'R.utils'

The following object is masked from 'package:utils':

    timestamp

The following objects are masked from 'package:base':

    cat, commandArgs, getOption, isOpen, nullfile, parse, warnings

> show <- methods::show
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # General tests
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> x <- letters[1:8]
> x2 <- c(x[-1], "\n")
> x3 <- x2[-1]
> y <- as.list(x[1:3])
> 
> cat("mprint():\n")
mprint():
> print(x)
[1] "a" "b" "c" "d" "e" "f" "g" "h"
> mprint(x)
[1] "a" "b" "c" "d" "e" "f" "g" "h"
> 
> print(y)
[[1]]
[1] "a"

[[2]]
[1] "b"

[[3]]
[1] "c"

> mprint(y)
[[1]]
[1] "a"

[[2]]
[1] "b"

[[3]]
[1] "c"

> 
> cat("mcat():\n")
mcat():
> cat(x, "\n")
a b c d e f g h 
> mcat(x, "\n")
a b c d e f g h 
> 
> cat(x2)
b c d e f g h 
> mcat(x2)
b c d e f g h 
> 
> cat(x3, sep=",")
c,d,e,f,g,h,
> mcat(x3, sep=",")
c,d,e,f,g,h,
> 
> cat(x3, sep="\n")
c
d
e
f
g
h


> mcat(x3, sep="\n")
c
d
e
f
g
h


> 
> 
> cat("mstr():\n")
mstr():
> str(x)
 chr [1:8] "a" "b" "c" "d" "e" "f" "g" "h"
> mstr(x)
 chr [1:8] "a" "b" "c" "d" "e" "f" "g" "h"
> 
> str(y)
List of 3
 $ : chr "a"
 $ : chr "b"
 $ : chr "c"
> mstr(y)
List of 3
 $ : chr "a"
 $ : chr "b"
 $ : chr "c"
> 
> cat("mshow():\n")
mshow():
> show(x)
[1] "a" "b" "c" "d" "e" "f" "g" "h"
> mshow(x)
[1] "a" "b" "c" "d" "e" "f" "g" "h"
> 
> show(y)
[[1]]
[1] "a"

[[2]]
[1] "b"

[[3]]
[1] "c"

> mshow(y)
[[1]]
[1] "a"

[[2]]
[1] "b"

[[3]]
[1] "c"

> 
> cat("mprintf():\n")
mprintf():
> printf("x=%d\n", 1:3)
x=1
x=2
x=3
> mprintf("x=%d\n", 1:3)
x=1
x=2
x=3
> 
> cat("mout():\n")
mout():
> writeLines(x)
a
b
c
d
e
f
g
h
> mout(writeLines(x))
a
b
c
d
e
f
g
h
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Tests related to closure
> # - - - - - - - - - - - -- - - - - - - - - - - - - - - - - -
> mfoo <- function(a=1) {
+   mprintf("a=%s\n", a)
+ }
> 
> mbar <- function(...) {
+   mfoo(...)
+ }
> 
> a <- 2
> mfoo(a)
a=2
> mfoo(3)
a=3
> 
> mbar(a)
a=2
> mbar(3)
a=3
> 
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Assert that "console" messages can be captured/sunk
> # via stderr but not stdout
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> res <- captureOutput({ mcat("Hello") })
Hello
> str(res)
 chr(0) 
> stopifnot(length(res) == 0L)
> 
> withSink({ mcat("Hello") }, file="foo.txt", type="message")
> res <- readLines("foo.txt")
> str(res)
 chr "Hello"
> stopifnot(length(res) > 0L)
> 
> proc.time()
   user  system elapsed 
   0.29    0.14    0.40