gnu: python-matplotlib-documentation: Fix build.

* gnu/packages/python-xyz.scm (python-matplotlib-documentation)
[native-inputs]: Add python-ipykernel; replace texlive with a texlive-union
consisting of texlive-latex-amsfonts, texlive-latex-amsmath,
texlive-latex-enumitem, texlive-latex-expdlist, texlive-latex-preview,
texlive-latex-type1cm, texlive-latex-ucs, texlive-generic-pdftex,
texlive-fonts-amsfonts, texlive-fonts-ec, texlive-fonts-adobe-times, and
texlive-fonts-txfonts.
[arguments]: Do not build PDF, remove PDF-related changes; patch to avoid
dependency on network resources.

gnu/packages/python-xyz.scm

@@ -3537,9 +3537,24 @@ toolkits.")
        ("python-sphinx-gallery" ,python-sphinx-gallery)
        ("python-numpydoc" ,python-numpydoc)
        ("python-ipython" ,python-ipython)
+       ("python-ipykernel" ,python-ipykernel)
        ("python-mock" ,python-mock)
        ("graphviz" ,graphviz)
-       ("texlive" ,texlive)
+       ("texlive" ,(texlive-union (list texlive-latex-amsfonts
+                                        texlive-latex-amsmath
+                                        texlive-latex-enumitem
+                                        texlive-latex-expdlist
+                                        texlive-latex-geometry
+                                        texlive-latex-preview
+                                        texlive-latex-type1cm
+                                        texlive-latex-ucs
+
+                                        texlive-generic-pdftex
+
+                                        texlive-fonts-amsfonts
+                                        texlive-fonts-ec
+                                        texlive-fonts-adobe-times
+                                        texlive-fonts-txfonts)))
        ("texinfo" ,texinfo)
        ,@(package-native-inputs python-matplotlib)))
     (arguments
@@ -3549,15 +3564,24 @@ toolkits.")
          (replace 'build
            (lambda _
              (chdir "doc")
-             ;; Produce pdf in 'A4' format.
+             (setenv "PYTHONPATH"
+                     (string-append (getenv "PYTHONPATH")
+                                    ":" (getcwd) "/../examples/units"))
              (substitute* "conf.py"
-               (("latex_paper_size = 'letter'") "")
+               ;; Don't use git.
-               ;; latex_paper_size is deprecated -> set paper size using
+               (("^SHA = check_output.*")
-               ;; latex_elements
+                (string-append "SHA = \"" ,version "\"\n"))
-               (("latex_elements\\['pointsize'\\] = '11pt'" match)
+               ;; Don't fetch intersphinx files from the Internet
-                ;; insert at a point where latex_elements{} is defined:
+               (("^explicit_order_folders" m)
-                (string-append match "\nlatex_elements['papersize'] = 'a4paper'")))
+                (string-append "intersphinx_mapping = {}\n" m))
-             (invoke "make" "SPHINXBUILD=sphinx-build" "html" "latex" "texinfo")))
+               (("'sphinx.ext.intersphinx',") "")
+               ;; Disable URL embedding which requires internet access.
+               (("'https://docs.scipy.org/doc/numpy'") "None")
+               (("'https://docs.scipy.org/doc/scipy/reference'") "None"))
+             (invoke "make"
+                     "SPHINXBUILD=sphinx-build"
+                     "SPHINXOPTS=" ; don't abort on warnings
+                     "html" "texinfo")))
          (replace 'install
            (lambda* (#:key inputs outputs #:allow-other-keys)
              (let* ((data (string-append (assoc-ref outputs "out") "/share"))
@@ -3575,12 +3599,9 @@ toolkits.")
                     (string-append "@image{matplotlib-figures/" file)))
                  (symlink (string-append html "/_images")
                           "./matplotlib-figures")
-                 (system* "makeinfo" "--no-split"
+                 (invoke "makeinfo" "--no-split"
                          "-o" "matplotlib.info" "matplotlib.texi"))
-               (copy-file "build/texinfo/matplotlib.info"
+               (install-file "build/texinfo/matplotlib.info" info))
-                          (string-append info "/matplotlib.info"))
-               (copy-file "build/latex/Matplotlib.pdf"
-                          (string-append doc "/Matplotlib.pdf")))
              #t)))))
     (home-page (package-home-page python-matplotlib))
     (synopsis "Documentation for the python-matplotlib package")