Add conditional section processing

index.js

@@ -3,6 +3,7 @@ var path = require('path');
 var fs = require('fs');
 var expansions = require('gyp-expansions');
 var load = require('gyp-load');
+var cond = require('gyp-conditions');
 
 var gyp = module.exports = function gyp(arg, variables, cb) {
     if (typeof arg == 'string' || arg instanceof String) {
@@ -96,7 +97,13 @@ function handle(thing, variables, which, cb) {
         }
 
         if (thing.conditions) {
-            /// @todo do conditional processing
+            thing.conditions.forEach(function (e) {
+                if (cond(e[0], variables)) {
+                    thing = merge(e[1], thing);
+                } else if (e[2]) {
+                    thing = merge(e[2], thing);
+                }
+            });
         }
 
         oiter(thing, function(e, cont, key) {

package.json

@@ -15,6 +15,7 @@
   "dependencies": {
     "gyp-merge": "0.2.x",
     "gyp-expansions": "0.0.x",
+    "gyp-conditions": "0.0.4",
     "gyp-load": "0.0.x"
   },
   "devDependencies": {

test/conditions.js

@@ -0,0 +1,16 @@
+var test = require('tap').test;
+var gyp = require('..');
+
+test("Conditional sections", function(t) {
+    var tests = 2;
+    gyp({ a: 1, conditions: [["merge==1", { b: 2}]] }, {merge: 1}, function(err, out) {
+        t.equal(out.a, "1", "a should be 1");
+        t.equal(out.b, "2", "b should be 2");
+        if (--tests == 0) t.end();
+    });
+    gyp({ a: 1, conditions: [["merge==2", { b: 2}]] }, {merge: 1}, function(err, out) {
+        t.equal(out.a, "1", "a should be 1");
+        t.not(out.b, "2", "b should not be 2");
+        if (--tests == 0) t.end();
+    });
+});