rstantools 2.2.0

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Updated “Step by step guide” vignette with instructions for adding new Stan models to an existing R package that already has Stan models. (#79, @rerickson-usgs)
Fixed R CMD check NOTE “configure does not appear to have a #! interpreter line”. (#83)
Use writeLines instead of cat to fix line endings issue reported by CRAN. (#87)
Switch to GitHub Actions for CI. (#90, @andrjohns)
Deprecate automatic creation of .travis.yml file. We now recommend the use of GitHub Actions. (#89)
Ensure compatibility with future versions of RStan. (#85, #94, @andrjohns, @hsbadr)

rstantools 2.1.1

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Compatibility with StanHeaders 2.21.0-3
Improve messaging around updating NAMESPACE file (#75, @mikekaminsky)
More informative error message for rstan_create_package() when directory already exists. (#68, @mcol)
Add generated C++ files to .gitignore and .Rbuildignore (#66, @mcol)
New generic posterior_epred() (#74)

Added Martin Lysy as a coauthor.
New function rstan_create_package() (based on usethis::create_package()) replaces rstan_package_skeleton() for the purpose of starting a new package with Stan functionality.
Stan functionality can be added to an existing package by calling use_rstan() instead of starting a new package from scratch.
Stan folder infrastructure now puts all .stan files in inst/stan and all auto-generated C++ files directly in src. This last step ensures that custom Rcpp source code can coexist with the Stan C++ code.
Each time a .stan file gets added/removed/modified requires a call to rstan_config() in order to generate the Stan C++ code and Rcpp::loadModule() calls. However, setting auto_config = TRUE (the default) in rstan_create_package() ensures rstan_config() is called whenever the package is installed (including via devtools::load_all()), so no need to call it manually unless the user wishes to inspect the Stan C++ code for issues.
roxygen2 documentation is now optional, but remains the default.
Rather than generating Stan “system files” via cat commands, rstantools now stores these as template files in inst/include/sys, so the build process can be easily modified as improvements become apparent.

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Fix issue related to changes in the usethis package by removing the fields argument to rstan_package_skeleton() and setting it internally instead.
New generic nsamples() (#35)

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New vignette walking through the package creation process. (#9) (thanks to Stefan Siegert)
rstan_package_skeleton() now calls usethis::create_package() instead of utils::package.skeleton(). (#28)
Update rstan_package_skeleton() for latest build process (#19)
rstan_package_skeleton() now does a bit more work for the user to make sure the the NAMESPACE file is correct.
Simplify instructions in Read-and-delete-me (related to #19).

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Add init_cpp() function for generating src/init.cpp in order to pass R CMD check in R 3.4.x. rstan_package_skeleton() calls init_cpp() internally. (#6)

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Minor fixes to rstan_package_skeleton() for better Windows compatibility. (#1, #2)
Fix some typos in the developer guidelines vignette. (#3, #4)
Add loo_predict(), loo_linpred(), and loo_predictive_interval() generics in preparation for adding methods to the rstanarm package. (#5)

Changes to rstan_package_skeleton:

Add comment in Read-and-delete-me about importing all of Rcpp and methods packages.
Include methods in Depends field of DESCRIPTION file.
Also download rstanarm’s Makevars.win file.