[bug#49408] [PATCH core-updates 1/5] gnu: TeX Live: Use IniTeX to build a couple of packages

[Thiago Jung Bauermann via Guix-patches via <guix-patches@gnu.org>]

The package texlive-latex-base in TeX Live 2021 will depend on
texlive-latex-l3kernel and texlive-latex-l3packages. Therefore we need to
remove their build dependency on texlive-latex-base to avoid a circular
dependency.

l3kernel and l3packages don’t need LaTeX during build, just IniTeX.
So to make them use it, modify texlive-build-system to allow disabling
the #:texlive-latex-base and #:tex-format parameters, and also add
a #:tex-engine parameter.

We also need to add texlive-docstrip as a native input, which was
previously provided by texlive-latex-base.

* gnu/packages/tex.scm (texlive-latex-l3kernel,
texlive-latex-l3packages)[arguments]: Add ‘#:tex-engine’, ‘#:tex-format’
and ‘#:texlive-latex-base’ parameters.
[native-inputs]: Add ‘texlive-docstrip’.
* guix/build-system/texlive.scm (lower)[build-inputs]: Don’t add
‘texlive-latex-base’ if its keyword parameter is false.
(texlive-build): Add ‘tex-engine’ keyword parameter.
[builder]: If a ‘tex-engine’ parameter was passed, use it. Otherwise, use
‘tex-format’ as the engine.
* guix/build/texlive-build-system.scm (compile-with-latex): Add ‘engine’
parameter. If the ‘format’ parameter is false, add “-ini” option to the
command line.
(build): Add ‘tex-engine’ parameter. Pass it down to ‘compile-with-latex’.
---
 gnu/packages/tex.scm                | 13 ++++++++++++-
 guix/build-system/texlive.scm       |  9 ++++++++-
 guix/build/texlive-build-system.scm | 12 +++++++-----
 3 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/gnu/packages/tex.scm b/gnu/packages/tex.scm
index 7a78563a75e5..bf557a4cf8ea 100644
--- a/gnu/packages/tex.scm
+++ b/gnu/packages/tex.scm
@@ -16,6 +16,7 @@
 ;;; Copyright © 2020, 2021 Paul Garlick <pgarlick@tourbillion-technology.com>
 ;;; Copyright © 2021 Maxim Cournoyer <maxim.cournoyer@gmail.com>
 ;;; Copyright © 2021 Leo Le Bouter <lle-bout@zaclys.net>
+;;; Copyright © 2021 Thiago Jung Bauermann <bauermann@kolabnow.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -3348,7 +3349,12 @@ Live distribution.")
                 "0w82d5a4d3rc950ms6ymj4mpw5ndz6qs5x53szcfgzgjxsns9l4w"))))
     (build-system texlive-build-system)
     (arguments
-     '(#:tex-directory "latex/l3kernel"))
+     '(#:tex-directory "latex/l3kernel"
+       #:tex-engine "tex"
+       #:tex-format #f
+       #:texlive-latex-base #f))
+    (native-inputs
+     `(("texlive-docstrip" ,texlive-docstrip)))
     (home-page "https://www.ctan.org/pkg/l3kernel")
     (synopsis "LaTeX3 programmers’ interface")
     (description
@@ -3373,6 +3379,9 @@ that the LaTeX3 conventions can be used with regular LaTeX 2e packages.")
     (build-system texlive-build-system)
     (arguments
      '(#:tex-directory "latex/l3packages"
+       #:tex-engine "tex"
+       #:tex-format #f
+       #:texlive-latex-base #f
        ;; build-targets must be specified manually since they are in
        ;; sub-directories.
        #:build-targets '("l3keys2e.ins" "xparse.ins" "xfrac.ins" "xfp.ins" "xtemplate.ins")
@@ -3394,6 +3403,8 @@ that the LaTeX3 conventions can be used with regular LaTeX 2e packages.")
                                       ":")))
              #t)))
        ))
+    (native-inputs
+     `(("texlive-docstrip" ,texlive-docstrip)))
     (propagated-inputs
      `(("texlive-latex-l3kernel" ,texlive-latex-l3kernel)))
     (home-page "https://www.ctan.org/pkg/l3packages")
diff --git a/guix/build-system/texlive.scm b/guix/build-system/texlive.scm
index 00a36d5862d4..bb671e5e2b32 100644
--- a/guix/build-system/texlive.scm
+++ b/guix/build-system/texlive.scm
@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2017 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2021 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2021 Thiago Jung Bauermann <bauermann@kolabnow.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -116,7 +117,9 @@ level package ID."
                    ;; Keep the standard inputs of 'gnu-build-system'.
                    ,@(standard-packages)))
     (build-inputs `(("texlive-bin" ,texlive-bin)
-                    ("texlive-latex-base" ,texlive-latex-base)
+                    ,@(if texlive-latex-base
+                          `(("texlive-latex-base" ,texlive-latex-base))
+                          '())
                     ,@native-inputs))
     (outputs outputs)
     (build texlive-build)
@@ -128,6 +131,7 @@ level package ID."
                         (tests? #f)
                         tex-directory
                         (build-targets #f)
+                        (tex-engine #f)
                         (tex-format "pdftex")
                         (phases '(@ (guix build texlive-build-system)
                                     %standard-phases))
@@ -151,6 +155,9 @@ level package ID."
                                #:source #+source
                                #:tex-directory #$tex-directory
                                #:build-targets #$build-targets
+                               #:tex-engine #$(if tex-engine
+                                                  tex-engine
+                                                  tex-format)
                                #:tex-format #$tex-format
                                #:system #$system
                                #:tests? #$tests?
diff --git a/guix/build/texlive-build-system.scm b/guix/build/texlive-build-system.scm
index 4c255700bbd2..353fb934a652 100644
--- a/guix/build/texlive-build-system.scm
+++ b/guix/build/texlive-build-system.scm
@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2017 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2021 Maxim Cournoyer <maxim.cournoyer@gmail.com>
+;;; Copyright © 2021 Thiago Jung Bauermann <bauermann@kolabnow.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -34,16 +35,17 @@
 ;;
 ;; Code:
 
-(define (compile-with-latex format file)
-  (invoke format
+(define (compile-with-latex engine format file)
+  (invoke engine
           "-interaction=nonstopmode"
           "-output-directory=build"
-          (string-append "&" format)
+          (if format (string-append "&" format) "-ini")
           file))
 
-(define* (build #:key inputs build-targets tex-format #:allow-other-keys)
+(define* (build #:key inputs build-targets tex-engine tex-format
+                #:allow-other-keys)
   (mkdir "build")
-  (for-each (cut compile-with-latex tex-format <>)
+  (for-each (cut compile-with-latex tex-engine tex-format <>)
             (if build-targets build-targets
                 (scandir "." (cut string-suffix? ".ins" <>)))))