Modify env file on the fly

This closes #52

lib/tasks/generate.js

@@ -6,6 +6,7 @@ import { exec } from 'child_process'
 import { log } from '../utils'
 import Mongonaut from 'mongonaut'
 import Insert from './insert'
+import dotenv from 'dotenv'
 
 class Generator {
   constructor (answers, targetDir) {
@@ -124,10 +125,35 @@ class Generator {
       }
 
       if (filePath.name == '.env') {
-        var contents = fs.createReadStream(file),
-            target = fs.createWriteStream(dest)
+        var contents = false
+
+        try {
+          contents = fs.readFileSync(file, 'utf8')
+        } catch (err) {
+          return log(err)
+        }
+
+        // Generate random session secret
+        process.env.SESSION_SECRET = Math.random().toString(36).substr(2, 20)
+
+        var parsed = dotenv.parse(new Buffer(contents)),
+            newVariables = {}
+
+        for (var property in parsed) {
+          var fromProcess = process.env[property]
+
+          if (fromProcess) {
+            var prefix = property + '='
+            contents = contents.replace(prefix + parsed[property], prefix + fromProcess)
+          }
+        }
+
+        try {
+          fs.writeFileSync(dest, contents)
+        } catch (err) {
+          return log(err)
+        }
 
-        contents.pipe(target)
         continue
       }
 

package.json

@@ -29,6 +29,7 @@
     "broccoli": "^0.16.9",
     "broccoli-sane-watcher": "^1.1.4",
     "chalk": "^1.1.3",
+    "dotenv": "^2.0.0",
     "fs-extra": "^0.30.0",
     "git-config": "0.0.7",
     "inquirer": "^1.0.1",