feat: run setup on npm install --save hoodie

bin/setup.js

@@ -0,0 +1,60 @@
+#!/usr/bin/env node
+
+var path = require('path')
+var fs = require('fs')
+var log = require('npmlog')
+
+// use process.env to access npm config environment variables.
+// - https://docs.npmjs.com/misc/config#environment-variables
+// - https://docs.npmjs.com/misc/config#save
+var saveRequested = process.env.npm_config_save
+
+// This block only executes if Hoodie is installed with `-S` or `--save` flags.
+if (saveRequested) {
+  var pathToAppRoot = path.resolve('..', '..')
+  var packageJson = require(path.join(pathToAppRoot, 'package.json'))
+
+  packageJson.scripts = packageJson.scripts || {}
+  packageJson.scripts[ 'start' ] = 'hoodie'
+
+  var newPackageJson = JSON.stringify(packageJson, null, 2)
+
+  fs.writeFile(path.join(pathToAppRoot, 'package.json'), newPackageJson,
+    function (error) {
+      if (error) {
+        log.error('setup', 'Could not create package.json at ' + path.join(pathToAppRoot, 'package.json'))
+        log.error(error)
+        return
+      }
+      log.info('setup', 'Start your Hoodie app with "npm start"')
+    })
+
+  // Create README.md if one is not found.
+  // - https://nodejs.org/api/fs.html#fs_fs_access_path_mode_callback
+  fs.open(path.join(pathToAppRoot, 'README.md'), 'wx',
+    function (error, fd) {
+      if (error) {
+        if (error.code === 'EEXIST') {
+          log.verbose('setup', 'README.md already exists')
+          return
+        } else {
+          log.error('setup', 'Something went wrong when opening README.md at ' + pathToAppRoot)
+          log.error(error)
+          return
+        }
+      }
+
+      // - https://nodejs.org/api/path.html#path_path_parse_path
+      var base = path.parse(pathToAppRoot).base
+      var readMeContents = '# ' + base + '\n' + 'Created with [hoodie](https://github.com/hoodiehq)'
+      fs.writeFile(fd, readMeContents,
+        function (error) {
+          if (error) {
+            log.error('setup', 'Could not create README.md at ' + pathToAppRoot)
+            log.error(error)
+            return
+          }
+          log.info('setup', 'README.md created')
+        })
+    })
+}