CRAN_packages.qmd

# Dépendances des packages R CRAN

## Chargement des librairies

```{r}
#| label: load_libraries
#| message: false

library(cranly)
```

## Récupérer les données du CRAN

L'outil de référence pour collecter les informations à jour des paquets est la commande `CRAN_package_db()`du package `tools`

```{r}
#| label: packages_list

package_db_file <- "data/package_db.RDS"
if (file.exists(package_db_file)) {
  package_db <- readRDS(package_db_file)
} else {
  package_db <- tools::CRAN_package_db()
  saveRDS(package_db, file = package_db_file)
}

head(package_db[,1:4])
nrow(package_db)
```

## Construction d'un arbre des dépendances avec `cranly`^[[R package dependence trees](https://cran.r-project.org/web/packages/cranly/vignettes/dependence_trees.html)]

```{r}
#| label: cranly_tree

library(cranly)

if (file.exists(package_db_file)) {
  package_db <- readRDS(package_db_file)
  cran_db <- clean_CRAN_db(package_db)
} else {
  cran_db <- clean_CRAN_db()
}

package_network <- build_network(cran_db)

package <- "visNetwork"

compute_dependence_tree(package_network, package)

tibble_tree <- build_dependence_tree(package_network, package)
plot(tibble_tree)


```