Initial commit

lib/build/affectedFiles/fetchRequires.js

@@ -0,0 +1,59 @@
+var fs = require('fs-extra');
+var path = require('path');
+var config = require('./fetchRequires.config.js');
+
+function checkConfig () {
+  if (!config.requirePattern) {
+    throw new Error("requirePattern needed at fetchRequires.config.js - Use it to define the regular expression to use for finding require invocations. Example: require\\('(\\..+)'\\)");
+  }
+  if (!config.defaultExt) {
+    throw new Error("defaultExt needed at fetchRequires.config.js - Use it to define the default extension to use for modules. Example: '.js'");
+  }
+  if (!config.validExtensions) {
+    throw new Error("validExtensions needed at fetchRequires.config.js - Use it to laod modules as is. That's it, to define valid extensions that don't need appending the default extension. Example: ['.tpl', '.json']");
+  }
+}
+
+var fetchRequires = function (absoluteFilePath) {
+  checkConfig();
+  var requirePattern = config.requirePattern;
+  var requireGlobalRegex = new RegExp(requirePattern, 'g');
+  var requireRegex = new RegExp(requirePattern);
+  var defaultExt = config.defaultExt;
+  var validExtensions = config.validExtensions;
+
+  return new Promise(function (resolve, reject) {
+    fs.readFile(absoluteFilePath, 'utf8', function (err, data) {
+      if (err) {
+        if (err.code && err.code === 'ENOENT') {
+          var error = new Error("ENOENT: no such file '" + err.path + "'. Perhaps we're adding the default extension to a valid file. Check `validExtensions` in fetchRequires.config.js and add a new one if needed.");
+          reject(error);
+          return;
+        }
+        reject(err);
+        return;
+      }
+
+      var requires = [];
+      if (data) {
+        var matchData = data.match(requireGlobalRegex);
+        if (matchData) {
+          matchData.forEach(function (require) {
+            var exec = requireRegex.exec(require);
+            if (exec) {
+              var absolutePath = path.resolve(path.dirname(absoluteFilePath), exec[1]);
+              var ext = path.extname(absolutePath);
+              if (validExtensions.indexOf(ext) === -1) {
+                absolutePath += defaultExt;
+              }
+              requires.push(absolutePath);
+            }
+          });
+        }
+      }
+      resolve(requires);
+    });
+  });
+};
+
+module.exports = fetchRequires;