Display a list of cached generators to run

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 *.log
+package-lock.json

bin/cli.js

@@ -1,26 +1,87 @@
 #!/usr/bin/env node
 const cac = require('cac')
+const inquirer = require('inquirer')
 const pkg = require('../package')
+const store = require('../lib/store')
 
 const cli = cac('sao')
 
 cli
-  .command('<generator> [outDir]', 'Run a generator')
+  .command('[generator] [outDir]', 'Run a generator')
   .action((generator, outDir, flags) => {
-    const options = Object.assign(
-      {
-        generator,
-        outDir: outDir || '.',
-        updateCheck: true
-      },
-      flags
-    )
-
-    return require('../')(options)
-      .run()
-      .catch(err => {
-        require('..').handleError(err)
+    const existingGenerators = store.get('generators', {})
+
+    function runGenerator(options) {
+      require('../')(options)
+        .run()
+        .catch(err => {
+          require('..').handleError(err)
+        })
+    }
+
+    if (Object.keys(existingGenerators).length > 0 && !generator) {
+      const choices = []
+      for (const [key] of Object.entries(existingGenerators)) {
+        let { type, name, path, slug } = existingGenerators[key]
+        let genName
+        switch (type) {
+          case 'local': {
+            const pathAry = path.split('/')
+            name = pathAry[pathAry.length - 1]
+            genName = path
+            break
+          }
+          case 'repo': {
+            const slugAry = slug.split('/')
+            name = slugAry[slugAry.length - 1]
+            genName = slug
+            break
+          }
+          default: {
+            name = name.replace('sao-', '')
+            genName = name
+            break
+          }
+        }
+        choices.push({
+          name: `[${type}] : ${name}`,
+          value: genName
+        })
+      }
+      const generatorPrompt = {
+        type: 'list',
+        name: 'generator',
+        message: 'Select an existing generator:',
+        choices
+      }
+      const outputPrompt = {
+        type: 'input',
+        name: 'outDir',
+        message: 'Output project to (file path):',
+        default: '.'
+      }
+      inquirer.prompt([generatorPrompt, outputPrompt]).then(answers => {
+        const { generator, outDir } = answers
+        const options = {
+          generator,
+          outDir,
+          updateCheck: true,
+          ...flags
+        }
+        return runGenerator(options)
       })
+    } else if (generator) {
+      const options = Object.assign(
+        {
+          generator,
+          outDir: outDir || '.',
+          updateCheck: true
+        },
+        flags
+      )
+
+      return runGenerator(options)
+    }
   })
   .option(
     '--npm-client <client>',