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| author | Ludovic Courtès <ludo@gnu.org> | 2017-04-05 15:19:15 +0200 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2017-04-05 22:45:41 +0200 |
| commit | f37f2b83fa95c1fe2bf01c4b8072cfc23d4c67ec (patch) | |
| tree | bed6bac6a29ee4575fdbf34604bd380f0d5c2ff7 /doc/guix.texi | |
| parent | 79f912c7106131f4179c727583d33500271361cd (diff) | |
| download | gnu-guix-f37f2b83fa95c1fe2bf01c4b8072cfc23d4c67ec.tar gnu-guix-f37f2b83fa95c1fe2bf01c4b8072cfc23d4c67ec.tar.gz | |
packages: Add 'package-mapping' and base 'package-input-rewriting' on it.
* guix/packages.scm (package-mapping): New procedure.
(package-input-rewriting): Rewrite in terms of 'package-mapping'.
* tests/packages.scm ("package-mapping"): New test.
* doc/guix.texi (Defining Packages): Document it.
Diffstat (limited to 'doc/guix.texi')
| -rw-r--r-- | doc/guix.texi | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/doc/guix.texi b/doc/guix.texi index aa779e38e2..b2498d039e 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -2946,6 +2946,16 @@ with @var{libressl}. Then we use it to define a @dfn{variant} of the This is exactly what the @option{--with-input} command-line option does (@pxref{Package Transformation Options, @option{--with-input}}). +A more generic procedure to rewrite a package dependency graph is +@code{package-mapping}: it supports arbitrary changes to nodes in the +graph. + +@deffn {Scheme Procedure} package-mapping @var{proc} [@var{cut?}] +Return a procedure that, given a package, applies @var{proc} to all the packages +depended on and returns the resulting package. The procedure stops recursion +when @var{cut?} returns true for a given package. +@end deffn + @menu * package Reference :: The package data type. * origin Reference:: The origin data type. |