feat(ip): Complete neigh show and flush

completions/ip

@@ -37,6 +37,19 @@ _comp_cmd_ip__link_types()
     )"
 }
 
+_comp_cmd_ip__neigh_states()
+{
+    _comp_compgen_split -- "$(
+        {
+            ${1-ip} -c=never neigh help || ${1-ip} neigh help
+        } 2>&1 | command sed -e \
+            '/STATE := /,/}/!d' -e \
+            's/.*{//' -e \
+            's/}.*//' -e \
+            's/|/ /g'
+    )"
+}
+
 _comp_cmd_ip()
 {
     local cur prev words cword comp_args
@@ -344,7 +357,20 @@ _comp_cmd_ip()
                     # TODO
                     ;;
                 show | flush)
-                    # TODO
+                    case "$prev" in
+                        nud)
+                            _comp_cmd_ip__neigh_states "$1"
+                            ;;
+                        dev)
+                            _comp_compgen_available_interfaces
+                            ;;
+                        nomaster | proxy | to | vrf) # TODO - Maybe we can complete vrf here?
+                            :
+                            ;;
+                        *)
+                            _comp_compgen -- -W 'proxy to nud vrf dev nomaster'
+                            ;;
+                    esac
                     ;;
                 *)
                     ((cword == subcword)) &&

test/t/test_ip.py

@@ -23,6 +23,14 @@ def test_stats(self, completion):
         # "link" was one of the first groups added, should always be there
         assert "link" in completion
 
+    @pytest.mark.complete(
+        "ip neigh show nud ",
+        require_cmd=True,
+        skipif="ip neigh help 2>&1 | grep 'STATE :=' > /dev/null; (( $? != 0 ))",
+    )
+    def test_neigh_state(self, completion):
+        assert "stale" in completion
+
     @pytest.mark.complete(
         "ip monitor ",
         require_cmd=True,