[OS independent] Use path.join

Signed-off-by: Eric Wang <skygragon@gmail.com>

Author: skygragon

lib/helper.js

@@ -113,15 +113,15 @@ h.getHomeDir = function() {
 };
 
 h.getCacheDir = function() {
-  return this.getHomeDir() + '/.lc/';
+  return path.join(this.getHomeDir(), '.lc');
 };
 
 h.getCacheFile = function(k) {
-  return this.getCacheDir() + k + '.json';
+  return path.join(this.getCacheDir(), k + '.json');
 };
 
 h.getConfigFile = function() {
-  return this.getHomeDir() + '/.lcconfig';
+  return path.join(this.getHomeDir(), '.lcconfig');
 };
 
 h.readStdin = function(cb) {

test/test_helper.js

@@ -129,7 +129,7 @@ describe('helper', function() {
       process.env.HOME = '/home/skygragon';
 
       assert.equal(h.getHomeDir(), '/home/skygragon');
-      assert.equal(h.getCacheDir(), '/home/skygragon/.lc/');
+      assert.equal(h.getCacheDir(), '/home/skygragon/.lc');
       assert.equal(h.getCacheFile('xxx'), '/home/skygragon/.lc/xxx.json');
       assert.equal(h.getConfigFile(), '/home/skygragon/.lcconfig');
       assert.equal(h.getFilename('/home/skygragon/.lc/xxx.json'), 'xxx');