gnu: Add go-go-mau-fi-webp.

* gnu/packages/golang-xyz.scm (go-go-mau-fi-webp): New variable.

Change-Id: I5a8b7f25085bb99d3bc7798ec90a1fbc73fc36e3

gnu/packages/golang-xyz.scm

@@ -16762,6 +16762,56 @@ MySQL.")
 written in Go, as well as some other related libraries like whatsmeow.")
     (license license:mpl2.0)))
 
+(define-public go-go-mau-fi-webp
+  (package
+    (name "go-go-mau-fi-webp")
+    (version "0.2.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/tulir/webp")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "0g2m162kmnz1d2zpmbgja330q1p9ygdryllfzm71zr7d5pr9fc13"))
+       (modules '((guix build utils)))
+       ;; FIXME: The project indludes a copy of libwebp
+       ;; (internal/libwebp-1.5.0) which is availalbe in Guix, find out how to
+       ;; build it with it's source.
+       (snippet
+        #~(begin
+            ;; Remove files which were auto generated by 'go generate'.
+            (for-each delete-file
+                      (find-files "." "^z_libwebp_src_.*\\.c$"))
+            ;; An Apple user was here (mem).
+            (for-each delete-file
+                      (find-files "^\\.DS_Store$"))))))
+    (build-system go-build-system)
+    (arguments
+     (list
+      #:import-path "go.mau.fi/webp"
+      ;; reader_test.go:34: image: unknown format
+      #:test-flags #~(list "-skip" "TestDecode")
+      #:phases
+      #~(modify-phases %standard-phases
+          (add-after 'unpack 'remove-benchmarks
+            (lambda* (#:key import-path #:allow-other-keys)
+              (with-directory-excursion (string-append "src/" import-path)
+                (delete-file-recursively "bench"))))
+          (add-after 'unpack 'go-generate
+            (lambda* (#:key import-path #:allow-other-keys)
+              (with-directory-excursion (string-append "src/" import-path)
+                (invoke "go" "generate")))))))
+    (propagated-inputs (list go-golang-org-x-image))
+    (home-page "https://go.mau.fi/webp")
+    (synopsis "WebP decoder and encoder for Golang")
+    (description
+     "Package webp implements a decoder and encoder for
+@code{https://en.wikipedia.org/wiki/WebP, WebP} images.  It's a maintained
+fork of @code{github.com/chai2010/webp}.")
+    (license license:bsd-3)))
+
 (define-public go-go-mongodb-org-mongo-driver
   (package
     (name "go-go-mongodb-org-mongo-driver")