feat: add siteConfig loader

lib/loader/config.js

@@ -0,0 +1,14 @@
+const fs = require('fs-extra');
+const path = require('path');
+
+module.exports = function loadConfig(sourceDir, deleteCache = true) {
+  const configPath = path.resolve(sourceDir, '.blogi', 'config.js');
+  if (deleteCache) {
+    delete require.cache[configPath];
+  }
+  let config = {};
+  if (fs.existsSync(configPath)) {
+    config = require(configPath);
+  }
+  return config;
+};

lib/loader/index.js

@@ -0,0 +1,12 @@
+const path = require('path');
+const loadConfig = require('./config');
+
+module.exports = async function load(sourceDir) {
+  // 1. load siteConfig
+  const siteConfig = loadConfig(sourceDir);
+
+  // 2. extract metadata from markdown files
+  const metadatas = [];
+
+  return null; // todo
+};