feat(file): filename should be case sensitive on crose-platform

lib/file.js

@@ -3,6 +3,7 @@
 var fs = require('fs');
 var path = require('path');
 var Vinyl = require('vinyl');
+var exists = require('exists-case').sync;
 var join = path.join;
 var relative = path.relative;
 var extname = path.extname;
@@ -146,8 +147,7 @@ function tryFile(src, cwd) {
   for (var i in fileArray) {
     var file = join(cwd, fileArray[i]);
     try {
-      var stat = fs.statSync(file);
-      if (stat.isFile()) {
+      if (exists(file) && fs.statSync(file).isFile()) {
         return fileArray[i];
       }
     } catch(e) {}

package.json

@@ -5,14 +5,15 @@
   "main": "index",
   "dependencies": {
     "arale": "~0.2.0",
+    "crequire": "~1.5.0",
     "css-imports": "~0.3.0",
     "debug": "~1.0.2",
+    "exists-case": "~0.1.0",
+    "extend": "~1.3.0",
     "glob": "~4.0.2",
-    "crequire": "~1.5.0",
+    "mixarg": "~0.2.0",
     "semver": "~2.3.1",
-    "extend": "~1.3.0",
-    "vinyl": "~0.4.6",
-    "mixarg": "~0.2.0"
+    "vinyl": "~0.4.6"
   },
   "devDependencies": {
     "coveralls": "~2.8.0",
@@ -32,4 +33,4 @@
   "scripts": {
     "test": "make test"
   }
-}
+}

test/fixtures/spm/case-sensitive/index.js

@@ -0,0 +1 @@
+require('./a.js');

test/fixtures/spm/case-sensitive/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "case-sensitive",
+  "version": "1.0.0"
+}

test/spm.test.js

@@ -433,6 +433,12 @@ describe('Father.SpmPackage', function() {
         getPackage('recursive');
       }).should.throw('found test/fixtures/spm/recursive/index.js has recursive dependency');
     });
+
+    it('should require file case sensitive', function() {
+      (function() {
+        getPackage('case-sensitive');
+      }).should.throw('test/fixtures/spm/case-sensitive/a.js not found that required by test/fixtures/spm/case-sensitive/index.js');
+    });
   });
 });