feat(config): allow sharing options between build configs

Author: Florens Verschelde

gulp/helpers/normalize.js

@@ -1,23 +1,50 @@
 'use strict'
 
+var notify = require('./notify.js')
+
 /**
  * Normalize a list of config objects with `src`, `dest`
  * and optional `watch` properties.
- * @param {Array|Object} configs
+ * @param {Object} baseConfig
  * @returns {Array}
  */
-module.exports = function(configs) {
-  return [].concat(configs)
-    .filter(function(config) {
-      return typeof config === 'object' && config.src && config.dest
-    })
-    .map(function(config) {
-      config.src = [].concat(config.src).filter(function(x) {
-        return typeof x === 'string'
+module.exports = function(baseConfig) {
+  var list = []
+  // Make full config objects if we have several build entries
+  if (typeof baseConfig === 'object' && Array.isArray(baseConfig.builds)) {
+    var common = Object.keys(baseConfig).filter(function(x){return x!=='builds'})
+    baseConfig.builds.forEach(function(build) {
+      var config = {}
+      common.concat(Object.keys(build)).forEach(function(key) {
+        config[key] = key in build ? build[key] : baseConfig[key]
       })
-      if (config.watch === true) {
-        config.watch = config.src
-      }
-      return config
+      list.push(config)
+    })
+  }
+  else {
+    list.push(baseConfig)
+  }
+  // Normalize the src and watch properties
+  var normalized = list.map(function(config) {
+    if (typeof config !== 'object') return config
+    config.src = [].concat(config.src).filter(function(x) {
+      return typeof x === 'string' && x.trim() !== ''
+    })
+    if (config.watch === true) {
+      config.watch = config.src
+    }
+    return config
+  })
+  // And filter final configs objects
+  return normalized.filter(function(config) {
+    var ok = typeof config === 'object' &&
+      typeof config.dest === 'string' &&
+      Array.isArray(config.src) &&
+      config.src.length > 0
+    if (!ok) notify({
+      title: '[assets-builder] Invalid config object',
+      message: JSON.stringify(config)
     })
+    return ok
+  })
 }