I was looking at some issues on GitHub when I found this example provided by Dirk Eddelbuettel
to evaluate the number of species of a dependencies of a package. I decided to
experiment a little bit package_dependencies()
.
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| R> library(tools)
R> ap <- available.packages()
R> nrow(ap) # nb available package
[1] 13385
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Retrieve the packages rcites
depends on:
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| R> rc <- tools::package_dependencies("rcites", ap, "Imports")
R> rc
$rcites
[1] "httr" "jsonlite" "data.table" "methods"
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The number of packages that depend or import Rcpp
:
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| R> rc <- package_dependencies("Rcpp", ap, reverse = TRUE) %>% unlist %>% length
R> rc
$rcites
[1] "httr" "jsonlite" "data.table" "methods"
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https://twitter.com/eddelbuettel/status/1063051483661381633
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| R> rc <- package_dependencies("Rcpp", ap, reverse = TRUE) %>% unlist %>% length
R> rc
[1] 1503
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Yep, >1500! Dirk Eddelbuettel mentioned this recently:
A last example, the full list of packages
rcites
depends on (including the
dependencies of the dependencies):
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| R> rcf <- tools::package_dependencies("rcites", ap, recursive = TRUE)
R> rcf
$rcites
[1] "httr" "jsonlite" "data.table" "methods" "mime"
[6] "curl" "openssl" "R6" "tools"
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