gnu: Add didjvu.

* gnu/packages/djvu.scm (didjvu): New variable.

gnu/packages/djvu.scm

@@ -331,3 +331,70 @@ It is able to:
 @end itemize\n")
     (home-page "https://jwilk.net/software/djvusmooth")
     (license license:gpl2)))
+
+(define-public didjvu
+  (package
+    (name "didjvu")
+    (version "0.9")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "https://github.com/jwilk/didjvu/releases/download/" version
+             "/didjvu-" version ".tar.gz"))
+       (sha256
+        (base32 "0xyrnk8d2khi7q1zr28gjkjq6frz4mkb5jdl8821yzf12k7c8pbv"))))
+    (build-system gnu-build-system)
+    (native-inputs
+     `(("python2-nose" ,python2-nose)))
+    (inputs
+     `(("djvulibre" ,djvulibre)
+       ("minidjvu" ,minidjvu)
+       ("python" ,python-2)
+       ("python2-gamera" ,python2-gamera)
+       ("python2-pillow" ,python2-pillow)))
+    (arguments
+     `(#:modules ((guix build gnu-build-system)
+                  ((guix build python-build-system) #:prefix python:)
+                  (guix build utils))
+       #:imported-modules (,@%gnu-build-system-modules
+                           (guix build python-build-system))
+       #:test-target "test"
+       #:phases
+       (modify-phases %standard-phases
+         (delete 'configure)
+         (add-before 'check 'disable-failing-test
+           (lambda _
+             (substitute* "tests/test_ipc.py"
+               ;; test_wait_signal gets stuck forever
+               (("yield self\\._test_signal, name")
+                "return True")
+               ;; test_path fails to find a file it should have created
+               (("path = os\\.getenv\\('PATH'\\)\\.split\\(':'\\)")
+                "return True"))
+             (substitute* "tests/test_timestamp.py"
+               ;; test_timezones fails with:
+               ;;   '2009-12-18T21:25:14Z' != '2009-12-18T22:25:14+01:00'
+               (("@fork_isolation")
+                "return True"))))
+         (replace 'install
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let ((out (assoc-ref outputs "out")))
+               (invoke "make"
+                       "DESTDIR="
+                       (string-append "PREFIX=" out)
+                       "install"))))
+         (add-after 'install 'wrap-python
+           (assoc-ref python:%standard-phases 'wrap))
+         (add-after 'wrap-python 'wrap-path
+           (lambda* (#:key inputs outputs #:allow-other-keys)
+             (let ((out (assoc-ref outputs "out"))
+                   (djvulibre (assoc-ref inputs "djvulibre")))
+               (wrap-program (string-append out "/bin/didjvu")
+                 `("PATH" ":" prefix (,(string-append djvulibre "/bin"))))))))))
+    (synopsis "DjVu encoder with foreground/background separation")
+    (description
+     "@code{didjvu} uses the @code{Gamera} framework to separate the foreground
+and background layers of images, which can then be encoded into a DjVu file.")
+    (home-page "https://jwilk.net/software/didjvu")
+    (license license:gpl2)))