gnu: texlive-tex-plain -> texlive-plain.

* gnu/packages/tex.scm (texlive-plain): New variable.
(texlive-tex-plain): Deprecate variable.
(texlive-hyph-utf8):
(texlive-latex-base):
(texlive-pdftex):
(texlive-xetex):
* gnu/packages/chez.scm (chez-web): Use new name.

gnu/packages/chez.scm

@@ -1025,7 +1025,7 @@ create compilers, making them easier to understand and maintain.")
                                        texlive-pdftex
                                        texlive-context
                                        texlive-cm
-                                       texlive-tex-plain))))
+                                       texlive-plain))))
       (arguments
        (list
         #:make-flags

gnu/packages/tex.scm

@@ -1723,15 +1723,23 @@ programmers may assume e-TeX functionality.  The pdftex engine directly
 incorporates the e-TeX extensions.")
       (license license:knuth))))
 
-(define-public texlive-tex-plain
+(define-public texlive-plain
   (package
-    (inherit (simple-texlive-package
+    (name "texlive-plain")
-              "texlive-tex-plain"
+    (version (number->string %texlive-revision))
-              (list "/tex/plain/")
+    (source (texlive-origin
+             name version
+             (list "makeindex/plain/" "tex/plain/base/"
+                   "tex/plain/config/")
              (base32
-               "1hafbphx1486069cky87hyksx6ia5gd83m4wp2xmgc09z87faf0h")
+              "0zwvrfw8z28c9dy8nby5qfwbyrd2a0cdfwyd5jndscjczhw0yi62")))
-              #:trivial? #t))
+    (build-system texlive-build-system)
-    (home-page "https://www.ctan.org/pkg/plain")
+    (arguments
+     (list
+      #:tex-engine "tex"
+      #:tex-format #f
+      #:texlive-latex-base #f))
+    (home-page "https://ctan.org/pkg/plain")
     (synopsis "Plain TeX format and supporting files")
     (description
      "This package contains files used to build the Plain TeX format, as
@@ -1739,6 +1747,8 @@ described in the TeXbook, together with various supporting files (some also
 discussed in the book).")
     (license license:knuth)))
 
+(define-deprecated-package texlive-tex-plain texlive-plain)
+
 (define-public texlive-halloweenmath
   (let ((template (simple-texlive-package
                    "texlive-halloweenmath"
@@ -2724,7 +2734,7 @@ T1/EC and UTF-8 encodings.")
                (mkdir-p where)
                (with-directory-excursion where
                  (invoke "tex" "-ini"
-                         (string-append (assoc-ref inputs "texlive-tex-plain")
+                         (string-append (assoc-ref inputs "texlive-plain")
                                         "/share/texmf-dist/tex/plain/config/tex.ini"))))))
          (add-before 'build 'build-loaders-and-converters
            (lambda* (#:key outputs #:allow-other-keys)
@@ -2759,12 +2769,12 @@ T1/EC and UTF-8 encodings.")
     (native-inputs
      (list ruby-2.7
            texlive-bin
-           ;; The following packages are needed for build "tex.fmt", which we need
+           ;; The following packages are needed for build "tex.fmt", which we
-           ;; for a working "tex".
+           ;; need for a working "tex".
-           texlive-tex-plain
            texlive-cm
            texlive-knuth-lib
-           texlive-hyphen-base))
+           texlive-hyphen-base
+           texlive-plain))
     (home-page "https://ctan.org/pkg/hyph-utf8")
     (synopsis "Hyphenation patterns expressed in UTF-8")
     (description "Modern native UTF-8 engines such as XeTeX and LuaTeX need
@@ -3152,7 +3162,7 @@ formats.")
       (native-inputs
        `(("texlive-bin" ,texlive-bin)
          ("texlive-tex-ini-files" ,texlive-tex-ini-files)
-         ("texlive-tex-plain" ,texlive-tex-plain)
+         ("texlive-plain" ,texlive-plain)
          ("texlive-kpathsea" ,texlive-kpathsea)
          ("texlive-cm" ,texlive-cm)
          ("texlive-latex-fonts" ,texlive-latex-fonts)
@@ -8489,7 +8499,7 @@ e-TeX.")
            texlive-hyphen-base
            texlive-kpathsea
            texlive-tex-ini-files
-           texlive-tex-plain))
+           texlive-plain))
     (home-page "https://www.ctan.org/pkg/pdftex")
     (synopsis "TeX extension for direct creation of PDF")
     (description
@@ -12929,7 +12939,7 @@ itself may be shipped out to the DVI file.")
            texlive-l3packages
            texlive-lm
            texlive-tex-ini-files
-           texlive-tex-plain
+           texlive-plain
            texlive-unicode-data))
     (home-page "https://www.tug.org/texlive/")
     (synopsis "Extended variant of TeX for use with Unicode sources")