Be able to print after install

[jxstxn1]

I want to be able to print something like the usage after a successful install.

[Giuspepe]

Currently we are printing the following during installation of a plugin:

Installing my_plugin for my_cli
Installer downloaded
Preparing my_plugin installer...
Executing installer my_plugin...
Installed my_plugin for my_cli

Right now, plugin developers can only print something from their install.dart (so between Executing installer my_plugin... and Installed my_plugin for my_cli).

I see two ways to print something after the InstallPluginCommand prints 'Installed $pluginName for ${target.cliName}':

1. The plugin developer could create a file with the after-installation message from his install.dart. Then in InstallPluginCommand we can check whether such a file exists and print its contents after printing 'Installed $pluginName for ${target.cliName}'.
2. We move printing 'Installed $pluginName for ${target.cliName}' from InstallPluginCommand to the plugin's install.dart

However, would this effort be worth it? In the end it's just about printing Installed my_plugin for my_cli one line earlier or later 🤔