gnu: mandoc: Support zstd-compressed man pages.

Since #68242 Guix uses zstd compression for man pages.  Unfortunately,
upstream mandoc only supports gzip compressed man pages.  Luckily, zstd
provides a wrapper library which easily allows adapting software using
zlib to zstd compression.  This patch uses this wrapper library in
conjunction with mandoc to add support for zstd compression to it,
thereby allowing Guix man pages to be viewed with mandoc again.

Without this patch, mandoc is essentially defunct on Guix.

* gnu/packages/man.scm (mandoc): Support zstd compression.
* gnu/local.mk: Add new patch.
* gnu/packages/patches/mandoc-support-zstd-compression.patch: New file.

Signed-off-by: Maxim Cournoyer <[email protected]>
Change-Id: I49a6b9f81309aa1b9f0e5d19b1813dbac13cf968

1 files changed, 36 insertions, 18 deletions

diff --git a/gnu/packages/man.scm b/gnu/packages/man.scm
index 3148fcc8a1..1ff1fac991 100644
--- a/gnu/packages/man.scm
+++ b/gnu/packages/man.scm
@@ -37,6 +37,7 @@
   #:use-module (guix build-system gnu)
   #:use-module (guix build-system ruby)
   #:use-module (guix utils)
+  #:use-module (gnu packages)
   #:use-module (gnu packages base)
   #:use-module (gnu packages compression)
   #:use-module (gnu packages dbm)
@@ -273,30 +274,47 @@ pages into HTML format.")
               (method url-fetch)
               (uri (string-append "https://mandoc.bsd.lv/snapshots/mandoc-"
                                   version ".tar.gz"))
+              (patches (search-patches "mandoc-support-zstd-compression.patch"))
               (sha256
                (base32
                 "174x2x9ws47b14lm339j6rzm7mxy1j3qhh484khscw0yy1qdbw4b"))))
     (build-system gnu-build-system)
     (arguments
-     `(#:test-target "regress"
-       #:phases (modify-phases %standard-phases
-                  (add-before 'configure 'set-prefix
-                    (lambda* (#:key outputs #:allow-other-keys)
-                      (substitute* "configure"
-                        (("^CC=.*")
-                         (string-append "CC=" ,(cc-for-target) "\n"))
-                        (("^DEFCFLAGS=\\\\\"")
-                         "DEFCFLAGS=\"-O2 ")
-                        (("^UTF8_LOCALE=.*")      ;used for tests
-                         "UTF8_LOCALE=en_US.UTF-8\n")
-                        (("^MANPATH_(BASE|DEFAULT)=.*" _ which)
-                         (string-append "MANPATH_" which "="
-                                        "/run/current-system/profile/share/man\n"))
-                        (("^PREFIX=.*")
-                         (string-append "PREFIX=" (assoc-ref outputs "out")
-                                        "\n"))))))))
+      (list
+        #:test-target "regress"
+        #:make-flags
+        #~(list "VPATH=./zstd-src/zlibWrapper"
+                (string-join
+                  (list "CFLAGS=-DZWRAP_USE_ZSTD=1"
+                        "-I./zstd-src/zlibWrapper")
+                  " "))
+        #:phases
+        #~(modify-phases %standard-phases
+                         (add-after 'unpack 'unpack-zstd
+                           (lambda _
+                             (mkdir "zstd-src")
+                             (invoke "tar" "--strip-components=1" "-C"
+                                     "zstd-src" "-xf" #$(package-source zstd))))
+                         (add-before 'configure 'set-prefix
+                           (lambda* (#:key outputs #:allow-other-keys)
+                             (substitute*
+                               "configure"
+                               (("^CC=.*")
+                                (string-append "CC=" #$(cc-for-target) "\n"))
+                               (("^DEFCFLAGS=\\\\\"")
+                                "DEFCFLAGS=\"-O2 ")
+                               (("^UTF8_LOCALE=.*")      ;used for tests
+                                "UTF8_LOCALE=en_US.UTF-8\n")
+                               (("^MANPATH_(BASE|DEFAULT)=.*" _ which)
+                                (string-append
+                                  "MANPATH_" which "="
+                                  "/run/current-system/profile/share/man\n"))
+                               (("^PREFIX=.*")
+                                (string-append "PREFIX="
+                                               (assoc-ref outputs "out")
+                                               "\n"))))))))
     (native-inputs (list (libc-utf8-locales-for-target) perl)) ;used to run tests
-    (inputs (list zlib))
+    (inputs (list zlib (list zstd "lib")))
     (native-search-paths
      (list (search-path-specification
             (variable "MANPATH")