07/09: import/cran: Add vignette builder to native inputs.

[guix-commits]

rekado pushed a commit to branch master
in repository guix.

commit c363722e81a8aa54f64468db9fcc42ef8dd74944
Author: Ricardo Wurmus <address@hidden>
AuthorDate: Sat Mar 7 19:30:51 2020 +0100

    import/cran: Add vignette builder to native inputs.
    
    * guix/import/cran.scm (needs-knitr?): New procedure.
    (description->package): Use it.
---
 guix/import/cran.scm | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/guix/import/cran.scm b/guix/import/cran.scm
index bcb37ed..bb8226f 100644
--- a/guix/import/cran.scm
+++ b/guix/import/cran.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2015, 2016, 2017, 2018, 2019 Ricardo Wurmus <address@hidden>
+;;; Copyright © 2015, 2016, 2017, 2018, 2019, 2020 Ricardo Wurmus 
<address@hidden>
 ;;; Copyright © 2015, 2016, 2017, 2019, 2020 Ludovic Courtès <address@hidden>
 ;;; Copyright © 2017 Mathieu Othacehe <address@hidden>
 ;;;
@@ -385,6 +385,9 @@ reference the pkg-config tool."
       (tarball-needs-pkg-config? thing)
       (directory-needs-pkg-config? thing)))
 
+(define (needs-knitr? meta)
+  (member "knitr" (listify meta "VignetteBuilder")))
+
 ;; XXX adapted from (guix scripts hash)
 (define (file-hash file select? recursive?)
   ;; Compute the hash of FILE.
@@ -486,7 +489,9 @@ from the alist META, which was derived from the R package's 
DESCRIPTION file."
                  `(,@(if (needs-fortran? source (not git?))
                          '("gfortran") '())
                    ,@(if (needs-pkg-config? source (not git?))
-                         '("pkg-config") '()))
+                         '("pkg-config") '())
+                   ,@(if (needs-knitr? meta)
+                         '("r-knitr") '()))
                  'native-inputs)
               (home-page ,(if (string-null? home-page)
                               (string-append base-url name)