I don't know about you, but I am totally unable to read the
"herd status" line as it exists in the current state.  I mean, I love
sexps, but even I don't like a completely flat and ungreppable list
printed to stdout.

*** Previous output ***

cwebber@oolong:~/devel/shepherd$ sudo herd -s /var/run/shepherd/socket status
Started: (file-system-/run/systemd xorg-server file-system-/sys/fs/cgroup/cpuacct file-system-/mnt/debian syslogd term-tty1 root-file-system file-system-/sys/fs/cgroup/blkio avahi-daemon file-system-/sys/fs/cgroup upower-daemon console-font-tty6 console-font-tty3 nscd file-system-/run/user file-system-/sys/fs/cgroup/memory file-system-/dev/pts loopback term-tty2 user-processes term-tty4 postgres file-system-/sys/fs/cgroup/perf_event file-system-/sys/fs/cgroup/cpuset device-mapping-home-luks guix-daemon file-system-/sys/fs/cgroup/elogind file-system-/sys/fs/cgroup/devices file-system-/dev/shm dbus-system console-font-tty5 term-tty6 host-name term-tty3 file-system-/sys/fs/cgroup/hugetlb file-system-/sys/fs/cgroup/cpu file-system-/home networking ntpd console-font-tty4 urandom-seed user-file-
 systems file-system-/sys/fs/cgroup/freezer file-system-/gnu/store root console-font-tty2 term-tty5 console-font-tty1 udev)
Stopped: (ssh-daemon)

*** New output ***

cwebber@oolong:~/devel/shepherd$ sudo ./herd -s /var/run/shepherd/socket status
Started:
 + file-system-/run/systemd
 + xorg-server
 + file-system-/sys/fs/cgroup/cpuacct
 + file-system-/mnt/debian
 + syslogd
 + term-tty1
 + root-file-system
 + file-system-/sys/fs/cgroup/blkio
 + avahi-daemon
 + file-system-/sys/fs/cgroup
 + upower-daemon
 + console-font-tty6
 + console-font-tty3
 + nscd
 + file-system-/run/user
 + file-system-/sys/fs/cgroup/memory
 + file-system-/dev/pts
 + loopback
 + term-tty2
 + user-processes
 + term-tty4
 + postgres
 + file-system-/sys/fs/cgroup/perf_event
 + file-system-/sys/fs/cgroup/cpuset
 + device-mapping-home-luks
 + guix-daemon
 + file-system-/sys/fs/cgroup/elogind
 + file-system-/sys/fs/cgroup/devices
 + file-system-/dev/shm
 + dbus-system
 + console-font-tty5
 + term-tty6
 + host-name
 + term-tty3
 + file-system-/sys/fs/cgroup/hugetlb
 + file-system-/sys/fs/cgroup/cpu
 + file-system-/home
 + networking
 + ntpd
 + console-font-tty4
 + urandom-seed
 + user-file-systems
 + file-system-/sys/fs/cgroup/freezer
 + file-system-/gnu/store
 + root
 + console-font-tty2
 + term-tty5
 + console-font-tty1
 + udev
Stopped:
 - ssh-daemon

Whew!  I can read that finally.  And grep it too!

Speaking of grepping, the new bulleted behavior uses a "+" for services
enabled, and a "-" for disabled services.  That way if you do a grep,
you'll still know whether it was enabled/disabled.

 - Chris