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-rw-r--r--doc/guix.texi38
1 files changed, 36 insertions, 2 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 94d7a29bdf..d10fbce3a4 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -28,7 +28,7 @@ Copyright @copyright{} 2015, 2016, 2017 Leo Famulari@*
 Copyright @copyright{} 2015, 2016, 2017, 2018, 2019 Ricardo Wurmus@*
 Copyright @copyright{} 2016 Ben Woodcroft@*
 Copyright @copyright{} 2016, 2017, 2018 Chris Marusich@*
-Copyright @copyright{} 2016, 2017, 2018 Efraim Flashner@*
+Copyright @copyright{} 2016, 2017, 2018, 2019 Efraim Flashner@*
 Copyright @copyright{} 2016 John Darrington@*
 Copyright @copyright{} 2016, 2017 ng0@*
 Copyright @copyright{} 2016, 2017, 2018, 2019 Jan Nieuwenhuizen@*
@@ -6002,6 +6002,24 @@ are run after installation using the R function
 @code{tools::testInstalledPackage}.
 @end defvr
 
+@defvr {Scheme Variable} rakudo-build-system
+This variable is exported by @code{(guix build-system rakudo)} It
+implements the build procedure used by @uref{https://rakudo.org/,
+Rakudo} for @uref{https://perl6.org/, Perl6} packages. It installs the
+package to @code{/gnu/store/@dots{}/NAME-VERSION/share/perl6} and
+installs the binaries, library files and the resources, as well as wrap
+the files under the @code{bin/} directory.  Tests can be skipped by
+passing @code{#f} to the @code{tests?} parameter.
+
+Which rakudo package is used can be specified with @code{rakudo}.
+Which perl6-tap-harness package used for the tests can be specified with
+@code{#:prove6} or removed by passing @code{#f} to the
+@code{with-prove6?} parameter.
+Which perl6-zef package used for tests and installing can be specified
+with @code{#:zef} or removed by passing @code{#f} to the
+@code{with-zef?} parameter.
+@end defvr
+
 @defvr {Scheme Variable} texlive-build-system
 This variable is exported by @code{(guix build-system texlive)}.  It is
 used to build TeX packages in batch mode with a specified engine.  The
@@ -9290,7 +9308,9 @@ This shows the @emph{reverse} DAG of packages.  For example:
 guix graph --type=reverse-package ocaml
 @end example
 
-...@: yields the graph of packages that depend on OCaml.
+...@: yields the graph of packages that @emph{explicitly} depend on OCaml (if
+you are also interested in cases where OCaml is an implicit dependency, see
+@code{reverse-bag} below.)
 
 Note that for core packages this can yield huge graphs.  If all you want
 is to know the number of packages that depend on a given package, use
@@ -9324,6 +9344,20 @@ dependencies.
 @item bag-with-origins
 Similar to @code{bag}, but also showing origins and their dependencies.
 
+@item reverse-bag
+This shows the @emph{reverse} DAG of packages.  Unlike @code{reverse-package},
+it also takes implicit dependencies into account.  For example:
+
+@example
+guix graph -t reverse-bag dune
+@end example
+
+@noindent
+...@: yields the graph of all packages that depend on Dune, directly or
+indirectly.  Since Dune is an @emph{implicit} dependency of many packages
+@i{via} @code{dune-build-system}, this shows a large number of packages,
+whereas @code{reverse-package} would show very few if any.
+
 @item derivation
 This is the most detailed representation: It shows the DAG of
 derivations (@pxref{Derivations}) and plain store items.  Compared to