gnu: Add vim-fugitive.

* gnu/packages/vim.scm (vim-fugitive): New variable.

gnu/packages/vim.scm

@@ -440,6 +440,46 @@ trouble using them, because you do not have to remember each snippet name.")
       (home-page "https://github.com/Shougo/context_filetype.vim")
       (license license:expat)))) ; ??? check again
 
+;; The 2.2 release was in 2015, no new releases planned.
+(define-public vim-fugitive
+  (let ((commit "de6c05720cdf74c0218218d7207f700232a5b6dc")
+        (revision "1"))
+    (package
+      (name "vim-fugitive")
+      (version (string-append "2.2-" revision "." (string-take commit 7)))
+      (source
+        (origin
+          (method git-fetch)
+          (uri (git-reference
+                 (url "https://github.com/tpope/vim-fugitive.git")
+                 (commit commit)))
+          (file-name (string-append name "-" version "-checkout"))
+         (sha256
+          (base32
+           "0zg9vv7hirnx45vc2mwgg0xijmwwz55bssyd6cpdz71wbhrcpxxb"))))
+      (build-system gnu-build-system)
+      (arguments
+       '(#:tests? #f
+         #:phases
+         (modify-phases %standard-phases
+           (delete 'configure)
+           (delete 'build)
+           (replace 'install
+             (lambda* (#:key outputs #:allow-other-keys)
+               (let* ((out (assoc-ref outputs "out"))
+                      (vimfiles (string-append out "/share/vim/vimfiles"))
+                      (doc (string-append vimfiles "/doc"))
+                      (plugin (string-append vimfiles "/plugin")))
+                 (copy-recursively "doc" doc)
+                 (copy-recursively "plugin" plugin)
+                 #t))))))
+      (home-page "https://github.com/tpope/vim-fugitive")
+      (synopsis "Vim plugin to work with Git")
+      (description "Vim-fugitive is a wrapper for Vim that complements the
+command window, where you can stage and review your changes before the next
+commit or run any Git arbitrary command.")
+      (license license:vim)))) ; distributed under the same license as vim
+
 (define-public vim-airline
   (package
     (name "vim-airline")