Add zsh completion for networkctl (#3062)

shell-completion/zsh/_networkctl

@@ -0,0 +1,35 @@
+#compdef networkctl
+
+_networkctl_command(){
+    local -a _networkctl_cmds
+    _networkctl_cmds=(
+            'list:List existing links'
+	    'status:Show information about the specified links'
+	    'lldp:Show Link Layer Discovery Protocol status'
+    )
+    if (( CURRENT == 1 )); then
+        _describe -t commands 'networkctl command' _networkctl_cmds
+    else
+        local curcontext="$curcontext"
+        local -a _links
+        cmd="${${_networkctl_cmds[(r)$words[1]:*]%%:*}}"
+        if [ $cmd = "status" ]; then
+            _links=( "${(foa)$(networkctl list --no-legend | awk 'BEGIN{OFS=":"} /^\s/ {sub(/[[ \t]+/, ""); print $2,$0}' 2>/dev/null)}" )
+            if [[ -n "$_links" ]]; then
+                _describe -t links 'links' _links
+            else
+                _message "no links"
+            fi
+        else
+            _message "no more options"
+        fi
+    fi
+}
+
+_arguments \
+    {-a,--all}'[Show all links with status]' \
+    '--no-pager[Do not pipe output into a pager]' \
+    '--no-legend[Do not print the column headers]' \
+    {-h,--help}'[Show this help]' \
+    '--version[Show package version]' \
+    '*::networkctl commands:_networkctl_command'