Add and document R-cran build style; support CRAN in update-check.

Manual.md

@@ -673,6 +673,13 @@ depend on additional packages. This build style does not install
 dependencies to the root directory, and only checks if a binary package is
 available in repositories.
 
+- `R-cran` For packages that are available on The Comprehensive R Archive
+Network (CRAN). The build style requires the `pkgname` to start with
+`R-cran-` and any dashes (`-`) in the CRAN-given version to be replaced
+with the character `r` in the `version` variable. The `distfiles`
+location will automatically be set as well as the package made to depend
+on `R`.
+
 - `ruby-module` For packages that are ruby modules and are installable via `ruby install.rb`.
 Additional install arguments can be specified via `make_install_args`.
 

common/build-style/R-cran.sh

@@ -0,0 +1,7 @@
+#
+# This helper is for templates using R-cran.
+#
+do_install() {
+	mkdir -p ${DESTDIR}/usr/lib/R/library
+	( cd .. && R CMD INSTALL -l ${DESTDIR}/usr/lib/R/library ${pkgname#R-cran-} )
+}

common/environment/build-style/R-cran.sh

@@ -0,0 +1,4 @@
+makedepends+=" R"
+depends+=" R"
+distfiles="https://cran.r-project.org/src/contrib/${pkgname#R-cran-}_${version//r/-}.tar.gz"
+wrksrc="${XBPS_BUILDDIR}/${pkgname#R-cran-}"

common/xbps-src/shutils/update_check.sh

@@ -57,6 +57,8 @@ update_check() {
                 url="http://ftp.gnome.org/pub/GNOME/sources/$pkgname/cache.json";;
             *kernel.org/pub/linux/kernel/*)
                 rx=linux-'\K'${version%.*}'[\d.]+(?=\.tar\.xz)';;
+            *cran.r-project.org/src/contrib*)
+                rx='\b\Q'"${pkgname#R-cran-}"'\E_\K\d+(\.\d+)*(-\d+)?(?=\.tar)';;
             esac
         fi