v2: Dynamic completion for "helm repo" and "helm plugin" (#6265)

* feat(helm): Completion for helm repo remove

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

* feat(helm): Complete for helm plugin remove/update

helm repo remove <TAB> (will select from the names of configured repos)
helm plugin remove <TAB> (will select from names of installed plugins)
helm plugin update <TAB> (will select from names of installed plugins)

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

* feat(helm): Completion for helm repo update

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

cmd/helm/helm.go

@@ -41,7 +41,7 @@ import (
 
 const (
 	bashCompletionFunc = `
-__helm_override_flag_list=(--kubeconfig --kube-context --host --tiller-namespace)
+__helm_override_flag_list=(--kubeconfig --kube-context --host --tiller-namespace --home)
 __helm_override_flags()
 {
     local ${__helm_override_flag_list[*]##*-} two_word_of of var
@@ -80,6 +80,28 @@ __helm_list_releases()
     fi
 }
 
+__helm_list_repos()
+{
+    __helm_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
+    local out oflags
+    oflags=$(__helm_override_flags)
+    __helm_debug "${FUNCNAME[0]}: __helm_override_flags are ${oflags}"
+    if out=$(helm repo list ${oflags} | 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 ${words[c]}"
+    local out oflags
+    oflags=$(__helm_override_flags)
+    __helm_debug "${FUNCNAME[0]}: __helm_override_flags are ${oflags}"
+    if out=$(helm plugin list ${oflags} | tail +2 | cut -f1 2>/dev/null); then
+        COMPREPLY=( $( compgen -W "${out[*]}" -- "$cur" ) )
+    fi
+}
+
 __helm_custom_func()
 {
     __helm_debug "${FUNCNAME[0]}: c is $c words[@] is ${words[@]}"
@@ -89,6 +111,14 @@ __helm_custom_func()
             __helm_list_releases
             return
             ;;
+        helm_repo_remove | helm_repo_update)
+            __helm_list_repos
+            return
+            ;;
+        helm_plugin_remove | helm_plugin_update)
+            __helm_list_plugins
+            return
+            ;;
         *)
             ;;
     esac