helm-v3: Dynamic completion for "helm repo" and "helm plugin" (#6263)

* Add dynamic completion for 'helm repo remove'

Signed-off-by: Marc Khouzam <marc.khouzam@ville.montreal.qc.ca>

* fix: --home flag has been removed

Signed-off-by: Marc Khouzam <marc.khouzam@ville.montreal.qc.ca>

* Dynamic completion for 'helm plugin remove/update'

Signed-off-by: Marc Khouzam <marc.khouzam@ville.montreal.qc.ca>

* Add returns for consitency

Signed-off-by: Marc Khouzam <marc.khouzam@ville.montreal.qc.ca>

cmd/helm/root.go

@@ -28,7 +28,7 @@ import (
 
 const (
 	bashCompletionFunc = `
-__helm_override_flag_list=(--kubeconfig --kube-context --home --namespace -n)
+__helm_override_flag_list=(--kubeconfig --kube-context --namespace -n)
 __helm_override_flags()
 {
     local ${__helm_override_flag_list[*]##*-} two_word_of of var
@@ -65,6 +65,22 @@ __helm_list_releases()
         COMPREPLY=( $( compgen -W "${out[*]}" -- "$cur" ) )
     fi
 }
+__helm_list_repos()
+{
+    __helm_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
+    local out
+    if out=$(helm repo list | tail +2 | cut -f1 2>/dev/null); then
+        COMPREPLY=( $( compgen -W "${out[*]}" -- "$cur" ) )
+    fi
+}
+__helm_list_plugins()
+{
+    __helm_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
+    local out
+    if out=$(helm plugin list | tail +2 | cut -f1 2>/dev/null); then
+        COMPREPLY=( $( compgen -W "${out[*]}" -- "$cur" ) )
+    fi
+}
 __helm_custom_func()
 {
 	__helm_debug "${FUNCNAME[0]}: last_command is $last_command"
@@ -73,7 +89,15 @@ __helm_custom_func()
 	    helm_upgrade | helm_rollback | helm_get_*)
             __helm_list_releases
             return
-            ;;
+			;;
+		helm_repo_remove)
+			__helm_list_repos
+			return
+			;;
+		helm_plugin_remove | helm_plugin_update)
+			__helm_list_plugins
+			return
+			;;
         *)
             ;;
     esac