Le 15/12/2025 à 16:02, Gabor Grothendieck a écrit :
I believe that would require a change to R itself. If you can make do
with a workaround then
1. this works but has the drawback that you need to define your own
string class. Below fmt
is an object with class "mystring".
as.mystring <- function(x) structure(x, class = "mystring")
"!.mystring" <- glue
fmt <- as.mystring("pi = {pi}")
!fmt
## pi = 3.14159265358979
Nice.
Which makes me think why not to use "!" on a classical string? Before
now, it was a meaningless operation so no potential conflicts should appear.
# setting up
`!` <- function(x) UseMethod("!") # make generic
`!.default` <- base::`!` # preserve the old behavior for other classes
`!.character`=glue::glue # make act as a glue on strings
# usage
!"pi={pi}"
# pi=3.14159265358979
!FALSE
# [1] TRUE ## as before
Best,
Serguei.
2. Another workaround if you are going to subsequently pass that
resulting string to some other
function anyways is to preface that function with fn$. It also
supports expressions surrounded
in backticks. The function does not have to be cat.
library(gsubfn)
fn$cat("pi = $pi\n")
## pi = 3.14159265358979
On Sun, Dec 14, 2025 at 8:07 PM ivo welch <[email protected]> wrote:
One of the more convenient syntax sugars of perl is the embedding of
variables in strings, aka, `$s="I am $a";`. R has similar functionality
through library glue. Alas, the library does not have the operator
flexibility to make it possible for glue to introduce a `g"I am {a}"` .
(One can define g("I am {a}") but that steals more of the function
namespace.) Would be nice sugar for end users to have...
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Serguei Sokol
Ingenieur de recherche INRAE
Cellule Mathématiques
TBI, INSA/INRAE UMR 792, INSA/CNRS UMR 5504
135 Avenue de Rangueil
31077 Toulouse Cedex 04
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email: [email protected]
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