guix: Add profile hook to build TeX live configuration.

* guix/profiles.scm (texlive-configuration): New procedure.
(%default-profile-hooks): Add it.
* guix/status.scm (hook-message): Handle "texlive-configuration" hook type.

guix/profiles.scm

@@ -4,7 +4,7 @@
 ;;; Copyright © 2014, 2016 Alex Kost <alezost@gmail.com>
 ;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2015 Sou Bunnbu <iyzsong@gmail.com>
-;;; Copyright © 2016, 2018 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2016, 2018, 2019 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2016 Chris Marusich <cmmarusich@gmail.com>
 ;;; Copyright © 2017 Huang Ying <huang.ying.caritas@gmail.com>
 ;;; Copyright © 2017 Maxim Cournoyer <maxim.cournoyer@gmail.com>
@@ -1338,6 +1338,50 @@ (define man-directory
                     `((type . profile-hook)
                       (hook . manual-database))))
 
+(define (texlive-configuration manifest)
+  "Return a derivation that builds a TeXlive configuration for the entries in
+MANIFEST."
+  (define entry->texlive-input
+    (match-lambda
+      (($ <manifest-entry> name version output thing deps)
+       (if (string-prefix? "texlive-" name)
+           (cons (gexp-input thing output)
+                 (append-map entry->texlive-input deps))
+           '()))))
+  (define build
+    (with-imported-modules '((guix build utils)
+                             (guix build union))
+      #~(begin
+          (use-modules (guix build utils)
+                       (guix build union))
+
+          ;; Build a modifiable union of all texlive inputs.  We do this so
+          ;; that TeX live can resolve the parent and grandparent directories
+          ;; correctly.  There might be a more elegant way to accomplish this.
+          (union-build #$output
+                       '#$(append-map entry->texlive-input
+                                      (manifest-entries manifest))
+                       #:create-all-directories? #t
+                       #:log-port (%make-void-port "w"))
+          (substitute* (string-append #$output
+                                      "/share/texmf-dist/web2c/texmf.cnf")
+            (("^TEXMFROOT = .*")
+             (string-append "TEXMFROOT = " #$output "/share\n"))
+            (("^TEXMF = .*")
+             "TEXMF = $TEXMFROOT/share/texmf-dist\n"))
+          #t)))
+
+    (with-monad %store-monad
+      (if (any (cut string-prefix? "texlive-" <>)
+               (map manifest-entry-name (manifest-entries manifest)))
+          (gexp->derivation "texlive-configuration" build
+                            #:substitutable? #f
+                            #:local-build? #t
+                            #:properties
+                            `((type . profile-hook)
+                              (hook . texlive-configuration)))
+          (return #f))))
+
 (define %default-profile-hooks
   ;; This is the list of derivation-returning procedures that are called by
   ;; default when making a non-empty profile.
@@ -1349,6 +1393,7 @@ (define %default-profile-hooks
         glib-schemas
         gtk-icon-themes
         gtk-im-modules
+        texlive-configuration
         xdg-desktop-database
         xdg-mime-database))
 

guix/status.scm

@@ -1,6 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
-;;; Copyright © 2018 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2018, 2019 Ricardo Wurmus <rekado@elephly.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -318,6 +318,8 @@ (define (hook-message hook-type)
      (G_ "building XDG MIME database..."))
     ('fonts-dir
      (G_ "building fonts directory..."))
+    ('texlive-configuration
+     (G_ "building TeX Live configuration..."))
     ('manual-database
      (G_ "building database for manual pages..."))
     (_ #f)))