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##############################################################################
# Copyright (c) 2012-2022 Russell V. Lenth #
# #
# This file is part of the emmeans package for R (*emmeans*) #
# #
# *emmeans* is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 2 of the License, or #
# (at your option) any later version. #
# #
# *emmeans* is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with R and *emmeans*. If not, see #
# <https://www.r-project.org/Licenses/> and/or #
# <http://www.gnu.org/licenses/>. #
##############################################################################
# Extra examples
#' Run or list additional examples
#'
#' This function exists so as to provide cleaner-looking examples in
#' help files when it must be run conditionally on another package.
#' Typically we want to run the code (\code{run = TRUE} is the default),
#' or otherwise just list it on the console (\code{list = TRUE}).
#'
#' @param name Character name of file to run. We look for a file with this name
#' (with \code{".R"} appended) in the system files provided with \pkg{emmeans}.
#' @param run Logical choosing whether or not to run the example code
#' @param list Logical choosing whether or not to list the example code
#' @param ... Used only by the developer
#'
#' @export
#'
#' @examples
#' # List an example
#' emm_example("qdrg-biglm", list = TRUE)
#'
#' # Run an example
#' if (require(biglm))
#' emm_example("qdrg-biglm")
#'
emm_example = function(name, run = !list, list = FALSE, ...) {
test = (\(test = FALSE, ...) test)(...)
if(test) {
file = paste0("inst/extexamples/", name, ".R")
filestg = paste0("inst/extexamples/", name, ".R")
}
else {
file = system.file("extexamples", paste0(name, ".R"), package = "emmeans")
if (file == "") stop("File '", name, ".R' not found")
filestg = paste0("system.file(\"extexamples\", \"", paste0(name, ".R"),
"\", package = \"emmeans\")")
}
if (list) {
cat(readLines(file), sep = "\n")
cat("\n")
}
if(run) {
prompt.echo = try(get("prompt.echo", parent.frame(3)), silent = TRUE)
continue.echo = try(get("continue.echo", parent.frame(3)), silent = TRUE)
if (inherits(prompt.echo, "try-error")) {
prompt.echo = getOption("prompt")
continue.echo = getOption("continue")
}
message("\n--- Running code from '", filestg, "'")
source(file, echo = TRUE, verbose = FALSE,
prompt.echo = prompt.echo, continue.echo = continue.echo)
cat("\n")
}
invisible()
}
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