Fix cp to match unix behavior

src/cp.js

@@ -140,8 +140,12 @@ function _cp(options, sources, dest) {
     // Recursive allows the shortcut syntax "sourcedir/" for "sourcedir/*"
     // (see Github issue #15)
     sources.forEach(function(src, i) {
-      if (src[src.length - 1] === '/')
+      if (src[src.length - 1] === '/') {
         sources[i] += '*';
+      // If src is a directory and dest doesn't exist, 'cp -r src dest' should copy src/* into dest
+      } else if (fs.statSync(src).isDirectory() && !exists) {
+        sources[i] += '/*';
+      }
     });
 
     // Create dest

test/cp.js

@@ -125,17 +125,23 @@ assert.equal(shell.cat('resources/cp/dir_a/z'), shell.cat('tmp/cp/dir_a/z')); //
 
 //recursive, creates dest dir since it's only one level deep (see Github issue #44)
 shell.rm('-rf', 'tmp/*');
-shell.cp('-r', 'resources/issue44/*', 'tmp/dir2');
+shell.cp('-r', 'resources/issue44', 'tmp/dir2');
 assert.equal(shell.error(), null);
 assert.equal(shell.ls('-R', 'resources/issue44') + '', shell.ls('-R', 'tmp/dir2') + '');
 assert.equal(shell.cat('resources/issue44/main.js'), shell.cat('tmp/dir2/main.js'));
 
 //recursive, does *not* create dest dir since it's too deep (see Github issue #44)
 shell.rm('-rf', 'tmp/*');
-shell.cp('-r', 'resources/issue44/*', 'tmp/dir2/dir3');
+shell.cp('-r', 'resources/issue44', 'tmp/dir2/dir3');
 assert.ok(shell.error());
 assert.equal(fs.existsSync('tmp/dir2'), false);
 
+//recursive, creates dest dir, implicitly copies contents of source dir
+shell.rm('-rf', 'tmp/*');
+shell.cp('-r', 'resources/cp/dir_a', 'tmp/dest');
+assert.equal(shell.error(), null);
+assert.equal(fs.existsSync('tmp/dest/z'), true);
+
 //preserve mode bits
 shell.rm('-rf', 'tmp/*');
 var execBit = parseInt('001', 8);

test/rm.js

@@ -179,6 +179,7 @@ assert.equal(fs.existsSync('tmp/tree4'), false);
 
 // remove symbolic link to a dir
 shell.rm('-rf', 'tmp');
+shell.mkdir('tmp');
 shell.cp('-R', 'resources/rm', 'tmp');
 shell.rm('-f', 'tmp/rm/link_to_a_dir');
 assert.equal(shell.error(), null);