Add "core" module for shared functionality between loaders/processors.

Author: jareware

core.js

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+var fs = require('fs');
+var path = require('path');
+
+var CONFIG_FILE_NAME = '.component-css-ns';
+
+// Looks for a CONFIG_FILE_NAME next to referenceFile, or along its parent chain, returning either its contents or null
+// TODO: Add lookup cache based on dirname
+function loadConfigFile(referenceFile) {
+  var dirname = path.dirname(path.resolve(referenceFile));
+  if (dirname === '/') return null; // can't ascend anymore -> call it quits
+  var candidate = path.join(dirname, CONFIG_FILE_NAME);
+  try {
+    return require(candidate);
+  } catch (e) {
+    return loadConfigFile(dirname); // ascend one path level and keep looking
+  }
+}
+
+module.exports = {
+  loadConfigFile: loadConfigFile
+};

test/cases/core/.component-css-ns.js

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+module.exports = {
+  hola: 123
+};

test/cases/core/deep/path/hierarchy/.gitkeep

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+pwd: /deep/path/hierarchy
+configFile: { hola: 123 }

test/cases/core/expected.out

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+{
+  "scripts": {
+    "test": "cd deep/path/hierarchy && node ../../../test.js"
+  }
+}

test/cases/core/node_modules/.bin

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+var core = require('component-css-ns/core');
+
+// Make sure we're testing the path ascension properly
+console.log('pwd:', process.cwd().substr(__dirname.length));
+
+// Test loading config file
+console.log('configFile:', core.loadConfigFile('whatever.css'));