Add support for newlines in -a="" arguments

Previously, you couldn't do this:

$ node program.js --foo="hey
  bar"

You'd end up with args.foo === 'hey'
Now you get the correct args.foo === "hey\nbar"

Note: the below WAS workign and continues to work (no = )

$ node program.js --foo "hey
  bar"

index.js

@@ -328,7 +328,10 @@ function Argv (args, cwd) {
                 break;
             }
             else if (arg.match(/^--.+=/)) {
-                var m = arg.match(/^--([^=]+)=(.*)/);
+                // Using [\s\S] instead of . because js doesn't support the
+                // 'dotall' regex modifier. See:
+                // http://stackoverflow.com/a/1068308/13216
+                var m = arg.match(/^--([^=]+)=([\s\S]*)$/);
                 setArg(m[1], m[2]);
             }
             else if (arg.match(/^--no-.+/)) {

test/parse.js

@@ -244,6 +244,19 @@ test('boolean groups', function (t) {
     t.end();
 });
 
+test('newlines in params' , function (t) {
+    var args = optimist.parse([ '-s', "X\nX" ])
+    t.same(args, { _ : [], s : "X\nX", $0 : $0 });
+
+    // reproduce in bash:
+    // VALUE="new
+    // line"
+    // node program.js --s="$VALUE"
+    args = optimist.parse([ "--s=X\nX" ])
+    t.same(args, { _ : [], s : "X\nX", $0 : $0 });
+    t.end();
+});
+
 test('strings' , function (t) {
     var s = optimist([ '-s', '0001234' ]).string('s').argv.s;
     t.same(s, '0001234');