Add tab completion script for zsh

This commit adds a new tab completion script for zsh. It also
fixes the completion script for bash to work with ABS backends.

extras/completions/floaty.bash

@@ -21,7 +21,7 @@ _vmfloaty()
 
     COMPREPLY=( $(compgen -W "${_vmfloaty_avail_templates}" -- "${cur}") )
   elif [[ $hostname_subcommands =~ (^| )$prev($| ) ]] ; then
-    _vmfloaty_active_hostnames=$(floaty list --active 2>/dev/null | grep '^-' | cut -d' ' -f2)
+    _vmfloaty_active_hostnames=$(floaty list --active --hostnameonly 2>/dev/null)
     COMPREPLY=( $(compgen -W "${_vmfloaty_active_hostnames}" -- "${cur}") )
   else
     COMPREPLY=( $(compgen -W "${subcommands}" -- "${cur}") )

extras/completions/floaty.zsh

@@ -0,0 +1,37 @@
+_floaty()
+{
+  local line subcommands template_subcommands hostname_subcommands
+
+  subcommands="delete get help list modify query revert snapshot ssh status summary token"
+
+  template_subcommands=("get" "ssh")
+  hostname_subcommands=("delete" "modify" "query" "revert" "snapshot")
+
+  _arguments -C \
+    "1: :(${subcommands})" \
+    "*::arg:->args"
+
+  if ((template_subcommands[(Ie)$line[1]])); then
+    _floaty_template_sub
+  elif ((hostname_subcommands[(Ie)$line[1]])); then
+    _floaty_hostname_sub
+  fi
+}
+
+_floaty_template_sub()
+{
+  if [[ -z "$_vmfloaty_avail_templates" ]] ; then
+    _vmfloaty_avail_templates=$(floaty list 2>/dev/null)
+  fi
+
+  _arguments "1: :(${_vmfloaty_avail_templates})"
+}
+
+_floaty_hostname_sub()
+{
+  _vmfloaty_active_hostnames=$(floaty list --active --hostnameonly 2>/dev/null)
+
+  _arguments "1: :(${_vmfloaty_active_hostnames})"
+}
+
+compdef _floaty floaty