Moved new build process out of gulp folder

build/evaluate.js

@@ -0,0 +1,63 @@
+const { sortBy, uniqBy } = require('lodash');
+const { resolve } = require('./resolve');
+const log = require('fancy-log');
+const Promise = require('bluebird');
+const fs = require('fs-extra');
+const path = require('path');
+
+const LOG = {
+  new:     true,
+  update:  true,
+  skip:    true,
+  rebuild: true,
+  cached:  false,
+  copy:    false,
+  silent:  false,
+};
+
+module.exports = exports = async function process (tasks, cache) {
+  const lastSeen = new Date();
+
+  tasks = uniqBy(tasks, 'output');
+  tasks = sortBy(tasks, [ 'input', 'output' ]);
+
+  await Promise.map(tasks, async (task) => {
+    let result;
+    let status = await cache.get(task);
+    const { input, output } = task;
+    const taskLog = [ status.mode, status.input, status.output ];
+    if (status.mode === 'skip') {
+      await cache.touch(task, lastSeen);
+      if (taskLog && LOG[taskLog[0]]) log.info(...taskLog);
+      return status;
+    }
+
+    if (status.mode === 'cached') {
+      result = status.cache;
+      await fs.ensureDir(path.dirname(resolve('dist', output)));
+      await fs.writeFile(resolve('dist', output), result);
+      await cache.touch(task, lastSeen);
+    } else {
+      try {
+        result = await task.action({
+          ...task,
+          input,
+          output: 'dist/' + output,
+        });
+      } catch (err) {
+        log.error(`Task (${task.action.name}) failed for file ${output}.\n`, err);
+        return false;
+      }
+
+      status = await cache.set(task, result, lastSeen);
+    }
+
+    if (taskLog && LOG[taskLog[0]]) log.info(...taskLog);
+
+    if (cache.isProd) {
+      fs.writeFile(resolve('dist', status.revPath), result);
+    }
+
+  }, { concurrency: 1 });
+
+};