writeAlizer (version 1.7.2)

model_deps: Report optional model dependencies (no installation performed)

Description

Discovers package dependencies for model fitting from the package `Suggests` field. This function **never installs** packages. It reports which packages are required and which are currently missing, and prints a ready-to-copy command you can run to install the missing ones manually.

Usage

model_deps()

Value

A named list:

required

Character vector of discovered package tokens (may include version qualifiers), e.g. c("glmnet (>= 4.1)", "ranger"). This is the union of the package Suggests field and the optional writeAlizer.required_pkgs override.

missing

Character vector of base package names that are not installed, e.g. c("glmnet", "ranger").

The function also emits a message. If nothing is missing, it reports that all required packages are installed. Otherwise, it lists the missing packages and prints a copy-paste install.packages() command.

Details

You can add or override discovered packages for testing or CI with `options(writeAlizer.required_pkgs = c("pkgA", "pkgB (>= 1.2.3)"))`. Any version qualifiers you include are preserved in the `required` output, but stripped for the availability check in `missing`.

Examples

md <- model_deps()
md$missing

# \dontshow{
# Test hook: pretend a package is required but not installed
old <- getOption("writeAlizer.required_pkgs"); on.exit(options(writeAlizer.required_pkgs = old), add = TRUE)
options(writeAlizer.required_pkgs = c("thispkgdoesnotexist123", "another.fake (>= 1.0)"))
md2 <- model_deps()
# }