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Assert packages, fixes #49 #56

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Assert packages, fixes #49 #56

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@ijlyttle ijlyttle commented Mar 3, 2019 •
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A new function, assert_packages(), can be used in place of code suggested by R Packages.

Instead of this:

if (!requireNamespace("pkg", quietly = TRUE)) {
  stop("Package \"pkg\" needed for this function to work. Please install it.", call. = FALSE)
}

You can use this:

assertthat::assert_packages("pkg")

This PR fixes #49:

  • adds assert_packages() to new file R/assert-packages.R
  • adds tests in new file tests/testthat/test-packages/R
  • updates Roxygen to 6.1.1, roxygenizes package
  • adds item to NEWS

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feature request: has_package()
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