Bug#1136499: emacs-ivy uses pidof but does not depend on procps

Source: emacs-ivy
Version: 0.15.1-3
Usertags: pidof-without-procps

Dear maintainer(s) of emacs-ivy,

it appears that emacs-ivy uses `pidof` in its testsuite, or that
at least one of its binary packages uses `pidof` at runtime.
Historically, `pidof` was provided by the Essential package
`sysvinit-tools`, making an explicit dependency unnecessary. However
`pidof` will soon be moved to `procps` and will no longer be part of
the Essential set.

Please add an explicit dependency on `procps`:

* via the `Depends:` field of all binary packages of emacs-ivy
  that use `pidof` at runtime;
* via the `Build-Depends:` field of emacs-ivy, if `pidof` is
  used in tests run at build-time;
* via the `Depends:` field of `debian/control/tests`, if `pidof` is
  used in autopkgtests.

To prevent any disruption for users of emacs-ivy, please add
this dependency now, before `pidof` is moved from `sysvinit-utils` to
`procps`. Alternatively, you could remove all uses of `pidof`.

It is believed that emacs-ivy uses `pidof` due to the following
code snippets:

```
path: emacs-ivy_0.15.1-3/counsel.el
                   (cdr (counsel--wmctrl-parse
                         (shell-command-to-string
                          "wmctrl -l -p | grep $(pidof rhythmbox)"))))))
      (when id
        (sit-for 0.2)


path: emacs-ivy_0.15.1-3/counsel.el
(defun counsel-rhythmbox-play-song (song)
  "Let Rhythmbox play SONG."
  (let ((first (string= (shell-command-to-string "pidof rhythmbox") ""))
        (service "org.gnome.Rhythmbox3")
        (path "/org/mpris/MediaPlayer2")
```

Feel free to close this issue if this is a false positive (for example
if this code is in an unreachable code path).

Regards,