gnu: Add byobu.

* gnu/packages/screen.scm (byobu): New variable.
* gnu/packages/patches/byobu-writable-status.patch: New patch.
* gnu-system.am (dist_patch_DATA): Add it.

gnu-system.am

@@ -411,6 +411,7 @@ dist_patch_DATA =						\
   gnu/packages/patches/bitlbee-configure-doc-fix.patch		\
   gnu/packages/patches/bluez-tests.patch			\
   gnu/packages/patches/boost-mips-avoid-m32.patch		\
+  gnu/packages/patches/byobu-writable-status.patch		\
   gnu/packages/patches/calibre-drop-unrar.patch			\
   gnu/packages/patches/calibre-no-updates-dialog.patch		\
   gnu/packages/patches/cdparanoia-fpic.patch			\

gnu/packages/patches/byobu-writable-status.patch

@@ -0,0 +1,13 @@
+Skeleton status files are installed read-only.  When copying to the config dir
+upon initialization, make sure they end up writable.
+
+--- byobu-5.98/usr/bin/byobu-janitor.in
++++ byobu-5.98/usr/bin/byobu-janitor.in
+@@ -82,6 +82,7 @@
+ 	if [ ! -r "$BYOBU_CONFIG_DIR/$f" ]; then
+ 		# Copy from skeleton, if possible
+ 		cp -f "$BYOBU_PREFIX/share/$PKG/status/$f" "$BYOBU_CONFIG_DIR/$f"
++		chmod +w "$BYOBU_CONFIG_DIR/$f"
+ 		# Enable ec2_cost, if we're in ec2 and seeding a new setup
+ 		if metadata_available; then
+ 			$BYOBU_SED_INLINE -e "s/#ec2_cost/ec2_cost/g" "$($BYOBU_READLINK -f $BYOBU_CONFIG_DIR/$f)"

gnu/packages/screen.scm

@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2013 Cyril Roelandt <tipecaml@gmail.com>
 ;;; Copyright © 2014 Mark H Weaver <mhw@netris.org>
+;;; Copyright © 2015 Eric Bavier <bavier@member.fsf.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -25,6 +26,8 @@
   #:use-module (gnu packages)
   #:use-module (gnu packages ncurses)
   #:use-module (gnu packages perl)
+  #:use-module (gnu packages python)
+  #:use-module (gnu packages slang)
   #:use-module (gnu packages texinfo))
 
 (define-public screen
@@ -90,3 +93,53 @@ view to show two terminals at once.")
 allowing you to run a program in an environment that is protected from the
 controlling terminal and attach to it later.")
     (license gpl2+)))
+
+(define-public byobu
+  (package
+    (name "byobu")
+    (version "5.98")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "https://launchpad.net/byobu/trunk/"
+                           version "/+download/byobu_"
+                           version ".orig.tar.gz"))
+       (sha256
+        (base32
+         "1s8nh4wbds1nh52i0d1hy1b308jjf4siwpq92lna1zh9ll4x71j5"))
+       (patches (list (search-patch "byobu-writable-status.patch")))))
+    (build-system gnu-build-system)
+    (inputs
+     `(("python" ,python-wrapper)       ;for config and session GUIs
+       ("python-newt" ,newt "python")))
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-before
+          'configure 'provide-locale
+          (lambda* (#:key inputs #:allow-other-keys)
+            (let ((libc   (assoc-ref inputs "libc"))) ;implicit input
+              (substitute* "usr/bin/byobu.in"
+                (("locale") (string-append libc "/bin/locale"))))))
+         (add-after
+          'install 'wrap-python-scripts
+          (lambda* (#:key inputs outputs #:allow-other-keys)
+            (let* ((python (string-append (assoc-ref inputs "python")
+                                          "/bin/python"))
+                   (out    (assoc-ref outputs "out"))
+                   (config (string-append out "/bin/byobu-config"))
+                   (select (string-append out "/bin/byobu-select-session")))
+              (wrap-program config
+                `("BYOBU_PYTHON" = (,python))
+                `("PYTHONPATH" ":" prefix (,(getenv "PYTHONPATH"))))
+              (wrap-program select
+                `("BYOBU_PYTHON" = (,python)))
+              #t))))))
+    (home-page "http://byobu.co/index.html")
+    (synopsis "Text-based window manager and terminal multiplexer")
+    (description
+     "Byobu is a Japanese term for decorative, multi-panel screens that serve
+as folding room dividers.  The Byobu software includes an enhanced profile,
+configuration utilities, and system status notifications for the GNU Screen
+window manager as well as the Tmux terminal multiplexer.")
+    (license gpl3+)))