Bug 27839: Add tab-completion in bash for koha-worker

This patch simply adds tab-completion for this script.

To test:
1. Apply this patch
2. Run:
   $ cp debian/koha-common.bash-completion  /etc/bash_completion.d/koha-common
3. Open a new bash instance
4. Type 'koha-worker <tab>'
=> SUCCESS: All options are there
5. Play with Koha instances
=> SUCCESS: they show up, once chosen they are not offered anymore
6. Sign off :-D

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

Signed-off-by: David Nind <david@davidnind.com>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

debian/koha-common.bash-completion

@@ -295,6 +295,44 @@ _koha-zebra()
 }
 complete -F _koha-zebra koha-zebra
 
+
+_koha-worker()
+{
+    local cur opts substract
+
+    COMPREPLY=()
+    _get_comp_words_by_ref cur
+    opts="--start --stop --restart --status --quiet -q --help -h"
+
+    # Build a list of the already used option switches
+    for (( i=0; i < ${#COMP_WORDS[@]}-1; i++ )); do
+        if [[ ${COMP_WORDS[i]} == -* ]]; then
+            case ${COMP_WORDS[i]} in
+                --start) _koha_list_cmd ; return 0 ;;
+                 --stop) _koha_list_cmd ; return 0 ;;
+              --restart) _koha_list_cmd ; return 0 ;;
+               --status) _koha_list_cmd ; return 0 ;;
+                 --help) COMPREPLY=() ; return 0 ;; # no more completions
+                     -h) COMPREPLY=() ; return 0 ;; # no more completions
+                --quiet) # filter the other quiet switches and go on
+                    substract="$substract -e -q"; ;;
+                -q)      # filter the other quiet switches and go on
+                    substract="$substract -e --quiet"; ;;
+            esac
+            substract="$substract -e ${COMP_WORDS[i]}"
+        fi
+    done
+
+    if [[ "$substract" != "" ]]; then
+        opts=$( echo $opts | sed -e 's/ /\n/g'  | grep -v -x $substract )
+    fi
+
+    COMPREPLY=( $(compgen -W "$opts" -- $cur ) )
+
+    return 0
+}
+complete -F _koha-worker koha-worker
+
 _koha-sip()
 {
     local cur opts substract