From 726c48e8c431471c4b1c892293fd0c5ba58689a0 Mon Sep 17 00:00:00 2001
From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Date: Tue, 28 Mar 2017 09:25:21 -0700
Subject: [PATCH] Generate man database files

---
 guix/profiles.scm | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/guix/profiles.scm b/guix/profiles.scm
index a62a076f64..68539bddfc 100644
--- a/guix/profiles.scm
+++ b/guix/profiles.scm
@@ -916,11 +916,76 @@ files for the truetype fonts of the @var{manifest} entries."
                                 (guix build union))
                     #:local-build? #t
                     #:substitutable? #f))
+ 
+(define (manual-database manifest)
+  (define man-db                        ;lazy reference
+    (module-ref (resolve-interface '(gnu packages man)) 'man-db))
+
+  (define build
+    #~(begin
+        (use-modules (guix build utils)
+                     (guix gexp)
+                     (srfi srfi-1))
+
+        (define entries
+          (filter-map (lambda (directory)
+                        (let ((man (string-append directory "/share/man")))
+                          (and (directory-exists? man)
+                               man)))
+                      '#$(manifest-inputs manifest)))
+
+        (define man-directory
+          (string-append #$output "/share/man"))
+
+        (define man-db-config-orig
+          (string-append #+man-db "/etc/man_db.conf"))
+
+        (define man-db-config
+          (string-append (getenv "PWD") "/man_db.conf"))
+
+        (define (create-mandb-map-entries manpaths catpath)
+          (string-join (map (lambda (manpath)
+                              (string-append "MANDB_MAP " manpath " " catpath))
+                            manpaths)
+                       "\n"))
+
+        ;; Create a mandb config file which contains all manpaths of the
+        ;; entries found... This is so that we can create a manpath -->
+        ;; catpath mapping to control where the database files get created.
+
+        (copy-file man-db-config-orig man-db-config)
+
+        ;; Doesn't work; error is: " no code for module (guix store)"
+        ;; I'll have to use Guile directly?
+        (file-append man-db-config
+                     (create-mandb-map-entries entries man-directory))
+
+        ;; Replace default MANDB_MAP entries by our own.
+;;         (substitute* man-db-config
+;;           (("^MANDB_MAP.*$")
+;;            ""))
+;;         (substitute* man-db-config
+;;           (("#		\\*MANPATH\\*     ->	\\*CATPATH\\*\\n#")
+;;            (string-append "#		*MANPATH*     ->	*CATPATH*
+;; #"
+;;                           (create-mandb-map-entries entries man-directory))))
+
+        
+        (mkdir-p man-directory)
+        (setenv "MANPATH" (string-join entries ":"))
+        (zero? (system* (string-append #+man-db "/bin/mandb") "--debug"
+                        "-c" "-C" man-db-config))))
+
+  (gexp->derivation "manual-database" build
+                    #:modules '((guix build utils)
+                                (guix gexp))
+                    #:local-build? #t))
 
 (define %default-profile-hooks
   ;; This is the list of derivation-returning procedures that are called by
   ;; default when making a non-empty profile.
   (list info-dir-file
+        manual-database
         fonts-dir-file
         ghc-package-cache-file
         ca-certificate-bundle
-- 
2.12.0