bug#25843: [PATCH 2/2] gnu: Add pzstd.

[Tobias Geerinckx-Rice]

* gnu/packages/compression.scm (pzstd): New variable.
---
 gnu/packages/compression.scm | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/gnu/packages/compression.scm b/gnu/packages/compression.scm
index 9870158..a6a978d 100644
--- a/gnu/packages/compression.scm
+++ b/gnu/packages/compression.scm
@@ -45,6 +45,7 @@
   #:use-module (gnu packages autotools)
   #:use-module (gnu packages backup)
   #:use-module (gnu packages base)
+  #:use-module (gnu packages check)
   #:use-module (gnu packages perl)
   #:use-module (gnu packages pkg-config)
   #:use-module (gnu packages python)
@@ -1169,3 +1170,38 @@ zlib.  In most scenarios, both compression and 
decompression can be performed in
 trade-off between compression ratio and speed, without affecting decompression
 speed.")
     (license license:bsd-3)))
+
+(define-public pzstd
+  (package (inherit zstd)
+    (name "pzstd")
+    (native-inputs
+     `(("googletest", googletest)))
+    (arguments
+     ;; The top-level Makefile uses a ‘test’ target, this one a normal ‘check’.
+     (strip-keyword-arguments
+      '(#:test-target)
+      (substitute-keyword-arguments (package-arguments zstd)
+        ((#:phases phases)
+         `(modify-phases ,phases
+            (add-after 'unpack 'enter-subdirectory
+              (lambda _ (chdir "contrib/pzstd")))
+            (add-before 'check 'compile-tests
+              (lambda* (#:key make-flags #:allow-other-keys)
+                (zero? (apply system* "make" "tests" make-flags))))
+            (add-after 'install 'install-documentation
+              (lambda* (#:key outputs #:allow-other-keys)
+                (let* ((out (assoc-ref outputs "out"))
+                       (doc (string-append out "/share/doc/" ,name)))
+                  (mkdir-p doc)
+                  (install-file "README.md" doc)
+                  #t))))))))
+    (synopsis "Threaded implementation of the Zstandard compression algorithm")
+    (description "Parallel Zstandard (PZstandard or @command{pzstd}) is a
+multi-threaded implementation of the @uref{http://zstd.net/, Zstandard
+compression algorithm}.  It is fully compatible with the original Zstandard 
file
+format and command-line interface, and can be used as a drop-in replacement.
+
+Compression is distributed over multiple processor cores to improve 
performance,
+as is the decompression of data compressed in this manner.  Data compressed by
+other implementations will only be split between two threads: one performing 
the
+actual decompression, the other input and output.")))
-- 
2.9.3