gnu: Add quickswitch-i3.

* gnu/packages/wm.scm (quickswitch-i3): New variable.
* gnu/packages/patches/quickswitch-fix-dmenu-check.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.

Signed-off-by: 宋文武 <iyzsong@gmail.com>

gnu/local.mk

@@ -784,6 +784,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/python-paste-remove-timing-test.patch	\
   %D%/packages/patches/python2-pygobject-2-gi-info-type-error-domain.patch \
   %D%/packages/patches/qt4-ldflags.patch			\
+  %D%/packages/patches/quickswitch-fix-dmenu-check.patch	\
   %D%/packages/patches/rapicorn-isnan.patch			\
   %D%/packages/patches/ratpoison-shell.patch			\
   %D%/packages/patches/readline-link-ncurses.patch		\

gnu/packages/patches/quickswitch-fix-dmenu-check.patch

@@ -0,0 +1,32 @@
+Fix check for dmenu (open file mode, dependency on which).
+
+See <https://github.com/proxypoke/quickswitch-for-i3/pull/24>.
+
+--- quickswitch-i3-2.2/quickswitch.py	2016-09-18 19:59:10.257765542 +0200
++++ quickswitch-i3-2.2/quickswitch.py	2016-09-21 10:43:01.277577819 +0200
+@@ -24,9 +24,10 @@
+ 
+ import argparse
+ import subprocess
+-import os
+ import re
+ 
++from distutils.spawn import find_executable
++
+ try:
+     import i3
+ except ImportError:
+@@ -37,11 +38,8 @@
+ 
+ def check_dmenu():
+     '''Check if dmenu is available.'''
+-    devnull = open(os.devnull)
+-    retcode = subprocess.call(["which", "dmenu"],
+-                              stdout=devnull,
+-                              stderr=devnull)
+-    return True if retcode == 0 else False
++    executable = find_executable("dmenu")
++    return executable != None
+ 
+ 
+ def dmenu(options, dmenu):

gnu/packages/wm.scm

@@ -11,6 +11,7 @@
 ;;; Copyright © 2016 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2016 ng0 <ng0@we.make.ritual.n0.is>
 ;;; Copyright © 2016 doncatnip <gnopap@gmail.com>
+;;; Copyright © 2016 Ivan Vilata i Balaguer <ivan@selidor.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -60,6 +61,7 @@
   #:use-module (gnu packages gperf)
   #:use-module (gnu packages imagemagick)
   #:use-module (gnu packages lua)
+  #:use-module (gnu packages suckless)
   #:use-module (guix download)
   #:use-module (guix git-download))
 
@@ -246,6 +248,50 @@ subscribe to events.")
 (define-public python2-i3-py
   (package-with-python2 python-i3-py))
 
+(define-public quickswitch-i3
+  (let ((commit "ed692b1e8f43b95bd907ced26238ce8ccb2ed28f")
+        (revision "1")) ; Guix package revision
+    (package
+      (name "quickswitch-i3")
+      (version (string-append "2.2-" revision "."
+                              (string-take commit 7)))
+      (source
+       (origin
+         ;; The latest commit is a few years old and just a couple commits
+         ;; after the last tagged release, so we use that latest commit
+         ;; instead of the release.
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/proxypoke/quickswitch-for-i3.git")
+               (commit commit)))
+         (sha256
+          (base32
+           "0447077sama80jcdg5p64zjsvafmz5rbdrirhm1adcdjhkh6iqc5"))
+         (patches (search-patches "quickswitch-fix-dmenu-check.patch"))
+         (file-name (string-append name "-" version "-checkout"))))
+      (build-system python-build-system)
+      (arguments
+       `(#:tests? #f ; no tests yet
+         #:phases (modify-phases %standard-phases
+                    (add-after 'install 'install-doc
+                      ;; Copy readme file to documentation directory.
+                      (lambda* (#:key outputs #:allow-other-keys)
+                        (let ((doc (string-append (assoc-ref outputs "out")
+                                                  "/share/doc/" ,name)))
+                          (install-file "README.rst" doc)
+                          ;; Avoid unspecified return value.
+                          #t))))))
+      (inputs
+       `(("python-i3-py" ,python-i3-py)
+         ("dmenu" ,dmenu)))
+      (home-page "https://github.com/proxypoke/quickswitch-for-i3")
+      (synopsis "Quickly change to and locate windows in the i3 window manager")
+      (description
+       "This utility for the i3 window manager allows you to quickly switch to
+and locate windows on all your workspaces, using an interactive dmenu
+prompt.")
+      (license (license:non-copyleft "http://www.wtfpl.net/txt/copying/")))))
+
 (define-public xmonad
   (package
     (name "xmonad")