feat: add plugins:post* hooks (#932)

* feat: add `plugins:post`* hooks

* fix: handle multiple uninstalls

src/commands/plugins/install.ts

@@ -1,5 +1,5 @@
 /* eslint-disable no-await-in-loop */
-import {Args, Command, Errors, Flags, Interfaces, ux} from '@oclif/core'
+import {Args, Command, Errors, Flags, Interfaces, Plugin, ux} from '@oclif/core'
 import {bold, cyan} from 'ansis'
 import validate from 'validate-npm-package-name'
 
@@ -195,6 +195,12 @@ Use the <%= config.scopedEnvVarKey('NPM_REGISTRY') %> environment variable to se
         throw error
       }
 
+      const pluginInstance = new Plugin(plugin)
+      await pluginInstance.load()
+      this.config.plugins.set(pluginInstance.name, pluginInstance)
+
+      await this.config.runHook('plugins:postinstall', {})
+
       ux.action.stop(`installed v${plugin.version}`)
     }
   }

src/commands/plugins/uninstall.ts

@@ -48,6 +48,8 @@ export default class PluginsUninstall extends Command {
       logLevel: determineLogLevel(this.config, flags, 'silent'),
     })
 
+    const pluginNameToDelete: string[] = []
+
     if (argv.length === 0) argv.push('.')
     for (const plugin of argv as string[]) {
       const friendly = removeTags(plugins.friendlyName(plugin))
@@ -64,15 +66,22 @@ export default class PluginsUninstall extends Command {
 
       try {
         const {name} = unfriendly
-        const displayName = friendly === '.' ? name : friendly ?? name
+        const displayName = friendly === '.' ? name : (friendly ?? name)
         ux.action.start(`${this.config.name}: Uninstalling ${displayName}`)
         await plugins.uninstall(name)
+        pluginNameToDelete.push(name)
       } catch (error) {
         ux.action.stop(bold.red('failed'))
         throw error
       }
 
       ux.action.stop()
     }
+
+    for (const p of pluginNameToDelete) {
+      this.config.plugins.delete(p)
+    }
+
+    await this.config.runHook('plugins:postuninstall', {})
   }
 }