Nothing
# for xfun::session_info('tinytex')
xfun_session_info = function() {
try_null = function(...) tryCatch(..., error = function(e) NULL)
version_info = function(cmd) try_null(system2(cmd, '--version', stdout = TRUE))
tweak_path()
pdftex_info = version_info('pdflatex')[1]
info = if (is.null(pdftex_info)) {
version_info('tectonic')[1] # try tectonic engine?
} else if (grepl('TeX Live', pdftex_info, fixed = TRUE)) {
# we get more information on tlmgr in that case
try_null(tlmgr_version('string'))
} else {
# for other distributions, e.g., MiKTeX-pdfTeX 4.8 (MiKTeX 21.8)
xfun::grep_sub('^.*\\((.*)\\)$', '\\1', pdftex_info)
}
if (!length(info)) return(invisible(NULL))
paste(c('LaTeX version used: ', paste0(' ', info)), collapse = '\n')
}
# read a file without warning, and discard lines with invalid characters to
# avoid warnings in the grep() family (invalid lines in log files should be safe
# to discard in this package, although it isn't so in general)
read_lines = function(...) {
x = readLines(..., warn = FALSE)
x[!validEnc(x)] = ''
x
}
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