add the plugin installer code in 'np.installer' NotePlan uses as core plugin internally

Author: EduardMe

np.installer/plugin.json

@@ -0,0 +1,27 @@
+{
+	"noteplan.minAppVersion": "3.3",
+	"plugin.id": "np.installer",
+	"plugin.name": "⬇️ Plugin Installer",
+	"plugin.description": "Install plugins right from the command bar. This is a core plugin and can't be deleted.",
+	"plugin.icon": "",
+	"plugin.author": "",
+	"plugin.repoUrl": "CorePlugins",
+	"plugin.version": "0.1",
+	"plugin.dependencies": [],
+	"plugin.script": "script.js",
+	"plugin.isRemote": "false",
+	"plugin.hidden": true,
+	"plugin.commands": [
+		{
+			"name": "install plugin",
+			"description": "Load a list of plugins and lets you install one",
+			"jsFunction": "installPlugins"
+		},
+		{
+			"name": "development install",
+			"description": "Load a list of plugins and lets you install one, including hidden ones",
+			"jsFunction": "installPluginsIncludingHidden"
+		},
+	],
+	"plugin.preferences": []
+}

np.installer/script.js

@@ -0,0 +1,46 @@
+
+async function installPluginsIncludingHidden() {
+	_installPlugins(true)
+}
+
+async function installPlugins() {
+	_installPlugins(false)
+}
+
+async function _installPlugins(showHidden) {
+  let plugins = await DataStore.listPlugins(true, showHidden)
+
+  let list = plugins.map(p => pluginToDescription(p))
+  list.push("❌ Cancel")
+
+  let selection = await CommandBar.showOptions(list, "Select a plugin to install/update:")
+
+  if(selection.index < plugins.length) {
+    let plugin = plugins[selection.index]
+    try {
+      let result = await DataStore.installPlugin(plugin, true)
+
+      let list = ["✅ OK", "📖 Open Readme", "", "Commands:"]
+      plugin.commands.forEach((item, i) => {
+        list.push("/" + item.name + " - " + item.desc)
+      });
+
+      let selection = await CommandBar.showOptions(list, "Successfully installed '" + plugin.name + "'")
+      if(selection.index == 1) {
+        CommandBar.openURL(plugin.repoUrl)
+      }
+    } catch(err) {
+      await CommandBar.showOptions(["✅ OK"], "Error: " + err)
+    }
+  }
+}
+
+function pluginToDescription(p) {
+  let installed = p.isOnline ? "" : ", installed: 🆗"
+
+  if(p.availableUpdate) {
+    installed += ", update: v" + p.availableUpdate.version + " 🆕"
+  }
+
+  return p.name + " (v" + p.version + installed + ")"
+}