[英]check if package name belongs to a CRAN archived package
How can one check of a package has been archived from CRAN. 如何从CRAN归档包的一个检查。 One can check if a package is a CRAN package like so:
可以检查包是否是CRAN包,如下所示:
"ggplot2" %in% available.packages()[,1]
## [1] TRUE
But a package like helpr shows false with the same code. 但像帮助程序这样的软件包使用相同的代码显示为false。 How could I check if a name is archived?
如何检查名称是否已存档?
"helpr" %in% available.packages()[,1]
## [1] FALSE
I could scrape the archive like this: 我可以像这样刮掉档案:
archs <- XML::readHTMLTable(readLines("https://cran.r-project.org/src/contrib/Archive/"),
stringsAsFactors = FALSE)
gsub("/$", "", na.omit(archs[[1]][, "Name"]))
but I assume there is a built in base way to to do this as using an archived package name will throw a warning in a CRAN check. 但我假设有一种内置的基本方法来执行此操作,因为使用存档的包名称将在CRAN检查中发出警告。
R CMD check
basically calls tools:::.check_packages
. R CMD check
基本上调用tools:::.check_packages
。 The functionality you're looking for is in tools:::.check_package_CRAN_incoming
, and tools:::CRAN_archive_db
. 您正在寻找的功能是
tools:::.check_package_CRAN_incoming
和tools:::CRAN_archive_db
。
Edit (by Tyler Rinker) Using Josh's answer the following code gives me what I'm after though less well succint than @hrbrmstr's: 编辑 (由Tyler Rinker提供)使用Josh的答案,下面的代码告诉我我所追求的虽然不如@ hrbrmstr那么简单:
get_archived <- function(cran = getOption("repos")){
if (is.null(cran)) cran <- "http://cran.rstudio.com/"
con <- gzcon(url(sprintf("%s/%s", cran, "src/contrib/Meta/archive.rds"), open = "rb"))
on.exit(close(con))
x <- readRDS(con)
names(x)
}
check_archived <- function(package){
package %in% get_archived()
}
check_archived("ggplot2")
check_archived("helpr")
check_archived("foo")
## > check_archived("ggplot2")
## [1] TRUE
## > check_archived("helpr")
## [1] TRUE
## > check_archived("foo")
## [1] FALSE
FWIW, rolling your own CRAN_archive_db
would be something like: FWIW,滚动你自己的
CRAN_archive_db
将是这样的:
download.file("https://cran.rstudio.com/src/contrib/Meta/archive.rds",
"archive.rds")
archive <- readRDS("archive.rds")
I think the somewhat-recently-released package available
by the ROpenSciLabs is designed for this (and much more): 我觉得有点-最近发布的包
available
通过ROpenSciLabs是专为这个(以及更多):
github.com/ropenscilabs/available github.com/ropenscilabs/available
Its readme (as of now) lists: 它的自述文件(截至目前)列出:
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