The best of both words: using both formatter functions in your log messages, which can be useful eg if you are migrating from sprintf formatted log messages to glue or similar.

formatter_glue_or_sprintf(
msg,
...,
.logcall = sys.call(),
.topcall = sys.call(-1),
.topenv = parent.frame()
)

## Arguments

msg

passed to sprintf as fmt or handled as part of ... in glue

...

passed to glue for the text interpolation

.logcall

the logging call being evaluated (useful in formatters and layouts when you want to have access to the raw, unevaluated R expression)

.topcall

R expression from which the logging function was called (useful in formatters and layouts to extract the calling function's name or arguments)

.topenv

original frame of the .topcall calling function where the formatter function will be evaluated and that is used to look up the namespace as well via logger:::top_env_name

character vector

## Details

Note that this function tries to be smart when passing arguments to glue and sprintf, but might fail with some edge cases, and returns an unformatted string.

This is a log_formatter, for alternatives, see formatter_paste, formatter_sprintf, formatter_glue_or_sprintf, formatter_logging, formatter_json, formatter_pander and skip_formatter for marking a string not to apply the formatter on it.

## Examples

if (FALSE) {
formatter_glue_or_sprintf("{a} + {b} = %s", a = 2, b = 3, 5)
formatter_glue_or_sprintf("{pi} * {2} = %s", pi*2)
formatter_glue_or_sprintf("{pi} * {2} = {pi*2}")

formatter_glue_or_sprintf("Hi ", "{c('foo', 'bar')}, did you know that 2*4={2*4}")
formatter_glue_or_sprintf("Hi {c('foo', 'bar')}, did you know that 2*4={2*4}")
formatter_glue_or_sprintf("Hi {c('foo', 'bar')}, did you know that 2*4=%s", 2*4)
formatter_glue_or_sprintf("Hi %s, did you know that 2*4={2*4}", c('foo', 'bar'))
formatter_glue_or_sprintf("Hi %s, did you know that 2*4=%s", c('foo', 'bar'), 2*4)
}