[PATCH] build-system/perl: Add wrap phase.

[Alex Sassmannshausen]

* guix/build/perl-build-system.scm (wrap): New procedure.
  (%standard-phases): Declare new phase, `wrap`, and use `wrap`
  procedure.
---
 guix/build/perl-build-system.scm | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/guix/build/perl-build-system.scm b/guix/build/perl-build-system.scm
index 8f480ea..194d76b 100644
--- a/guix/build/perl-build-system.scm
+++ b/guix/build/perl-build-system.scm
@@ -19,7 +19,10 @@
 (define-module (guix build perl-build-system)
   #:use-module ((guix build gnu-build-system) #:prefix gnu:)
   #:use-module (guix build utils)
+  #:use-module (ice-9 ftw)
   #:use-module (ice-9 match)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
   #:export (%standard-phases
             perl-build))
 
@@ -47,6 +50,36 @@
     (format #t "running `perl' with arguments ~s~%" args)
     (zero? (apply system* "perl" args))))
 
+(define* (wrap #:key inputs outputs #:allow-other-keys)
+  (define (list-of-files dir)
+    (map (cut string-append dir "/" <>)
+         (or (scandir dir (lambda (f)
+                            (let ((s (stat (string-append dir "/" f))))
+                              (eq? 'regular (stat:type s)))))
+             '())))
+
+  (define bindirs
+    (append-map (match-lambda
+                 ((_ . dir)
+                  (list (string-append dir "/bin")
+                        (string-append dir "/sbin"))))
+                outputs))
+
+  (let* ((out  (assoc-ref outputs "out"))
+         (perl (assoc-ref inputs "perl"))
+         (var `("PERL5LIB" prefix
+                ,(cons (string-append out "/lib/perl5/site_perl/"
+                                      ;; Like in python’s, we assume version
+                                      ;; at end of `perl' string.
+                                      (last (string-split perl #\-)))
+                       (search-path-as-string->list
+                        (or (getenv "PERL5LIB") ""))))))
+    (for-each (lambda (dir)
+                (let ((files (list-of-files dir)))
+                  (for-each (cut wrap-program <> var)
+                            files)))
+              bindirs)))
+
 (define-syntax-rule (define-w/gnu-fallback* (name args ...) body ...)
   (define* (name args ... #:rest rest)
     (if (access? "Build" X_OK)
@@ -70,9 +103,11 @@
 
 (define %standard-phases
   ;; Everything is as with the GNU Build System except for the `configure',
-  ;; `build', `check', and `install' phases.
+  ;; `build', `check', and `install' phases.  We also add a `wrap' phase to
+  ;; wrap perl binaries with a complete PERL5LIB path.
   (modify-phases gnu:%standard-phases
     (replace 'install install)
+    (add-after 'install 'wrap wrap)
     (replace 'check check)
     (replace 'build build)
     (replace 'configure configure)))
-- 
2.10.1