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.onAttach <- function(...) {
withr::with_preserve_seed({
if (!interactive() || stats::runif(1) > 0.1) return()
tip <- random_tip()
packageStartupMessage(paste(strwrap(tip), collapse = "\n"))
})
}
random_tip <- function() {
tips <- c(
"RStudio Community is a great place to get help: https://community.rstudio.com/c/tidyverse",
"Learn more about the underlying theory at https://ggplot2-book.org/",
"Keep up to date with changes at https://www.tidyverse.org/blog/",
"Use suppressPackageStartupMessages() to eliminate package startup messages",
"Need help? Try Stackoverflow: https://stackoverflow.com/tags/ggplot2",
"Need help getting started? Try the R Graphics Cookbok: https://r-graphics.org",
"Want to understand how all the pieces fit together? Read R for Data Science: https://r4ds.had.co.nz/"
)
sample(tips, 1)
}
# Assigning pathGrob in .onLoad ensures that packages that subclass GeomPolygon
# do not install with error `possible error in 'pathGrob(munched$x, munched$y, ':
# unused argument (pathId = munched$group)` despite the fact that this is correct
# usage
pathGrob <- NULL
.onLoad <- function(...) {
backport_unit_methods()
if (getRversion() < as.numeric_version("3.6")) {
pathGrob <<- function(..., pathId.lengths) {
grid::pathGrob(...)
}
}
.zeroGrob <<- grob(cl = "zeroGrob", name = "NULL")
# create the global variables holding all the theme settings
ggplot_global$theme_all_null <- theme_all_null() # cache all null theme, required by theme_grey()
ggplot_global$theme_current <- NULL # the current theme applied to plots if none is specified
ggplot_global$theme_default <- NULL # the underlying fallback default theme
ggplot_global$element_tree <- NULL # the current element tree for themes
reset_theme_settings() # sets the preceding three global variables to their actual defaults
# Used by rbind_dfs
date <- Sys.Date()
ggplot_global$date_origin <- date - unclass(date)
time <- Sys.time()
ggplot_global$time_origin <- time - unclass(time)
# To avoid namespace clash with dplyr.
# It seems surprising that this hack works
if (requireNamespace("dplyr", quietly = TRUE)) {
vars <<- dplyr::vars
}
}
release_questions <- function() {
c(
"Have you built the book?"
)
}
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