From fc87fef9fdffe623fe832c34440bfc557614129e Mon Sep 17 00:00:00 2001
From: "Gustavo L de Mello (Guz)" <contact@guz.one>
Date: Tue, 14 Jan 2025 16:30:30 -0300
Subject: [PATCH] feat(blogo,plugins,priorirygroup): prioriry group plugin for
 plugins with dynamic priority

---
 blogo/plugin_prioritylist.go | 70 ++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 blogo/plugin_prioritylist.go

diff --git a/blogo/plugin_prioritylist.go b/blogo/plugin_prioritylist.go
new file mode 100644
index 0000000..b17c9ea
--- /dev/null
+++ b/blogo/plugin_prioritylist.go
@@ -0,0 +1,70 @@
+// Copyright 2025-present Gustavo "Guz" L. de Mello
+// Copyright 2025-present The Lored.dev Contributors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package blogo
+
+import (
+	"cmp"
+	"slices"
+)
+
+const priorityGroupPluginName = "blogo-prioritygroup-group"
+
+type priorityGroup struct {
+	plugins []Plugin
+}
+
+type PriorityGroup interface {
+	PluginWithPlugins
+}
+
+func NewPriorityGroup(plugins ...Plugin) PriorityGroup {
+	return &priorityGroup{plugins}
+}
+
+func (p *priorityGroup) Name() string {
+	return priorityGroupPluginName
+}
+
+func (p *priorityGroup) Use(plugin Plugin) {
+	p.plugins = append(p.plugins, plugin)
+}
+
+func (p *priorityGroup) Plugins() []Plugin {
+	slices.SortStableFunc(p.plugins, func(a Plugin, b Plugin) int {
+		return cmp.Compare(p.getPriority(a, b), p.getPriority(b, a))
+	})
+	return p.plugins
+}
+
+func (p *priorityGroup) getPriority(plugin Plugin, cmp Plugin) int {
+	if plg, ok := plugin.(PluginWithDynamicPriority); ok {
+		return plg.Priority(cmp)
+	} else if plg, ok := plugin.(PluginWithPriority); ok {
+		return plg.Priority()
+	} else {
+		return 0
+	}
+}
+
+type PluginWithPriority interface {
+	Plugin
+	Priority() int
+}
+
+type PluginWithDynamicPriority interface {
+	Plugin
+	Priority(Plugin) int
+}