nodegit · johnhaley81 · May 20, 2015 · May 19, 2015 · May 19, 2015 · May 19, 2015
diff --git a/generate/input/descriptor.json b/generate/input/descriptor.json
@@ -260,7 +260,15 @@
           }
         },
         "git_checkout_index": {
-          "ignore": true
+          "args": {
+            "opts": {
+              "isOptional": true
+            }
+          },
+          "isAsync": true,
+          "return": {
+            "isErrorCode": true
+          }
         },
         "git_checkout_tree": {
           "args": {

diff --git a/lib/checkout.js b/lib/checkout.js
@@ -2,8 +2,9 @@ var NodeGit = require("../");
 var normalizeOptions = NodeGit.Utils.normalizeOptions;
 
 var Checkout = NodeGit.Checkout;
-var head = Checkout.head;
-var tree = Checkout.tree;
+var _head = Checkout.head;
+var _index = Checkout.index;
+var _tree = Checkout.tree;
 
 /**
 * Patch head checkout to automatically coerce objects.
@@ -16,7 +17,22 @@ var tree = Checkout.tree;
 Checkout.head = function(url, options) {
   options = normalizeOptions(options, NodeGit.CheckoutOptions);
 
-  return head.call(this, url, options);
+  return _head.call(this, url, options);
+};
+
+/**
+* Patch index checkout to automatically coerce objects.
+*
+* @async
+* @param {Repository} repo The repo to checkout an index
+* @param {Index} The index to checkout
+* @param {CheckoutOptions} [options] Options for the checkout
+* @return {Void} checkout complete
+*/
+Checkout.index = function(repo, index, options) {
+  options = normalizeOptions(options, NodeGit.CheckoutOptions);
+
+  return _index.call(this, repo, index, options);
 };
 
 /**
@@ -31,5 +47,5 @@ Checkout.head = function(url, options) {
 Checkout.tree = function(repo, treeish, options) {
   options = normalizeOptions(options, NodeGit.CheckoutOptions);
 
-  return tree.call(this, repo, treeish, options);
+  return _tree.call(this, repo, treeish, options);
 };
diff --git a/test/tests/checkout.js b/test/tests/checkout.js
@@ -1,5 +1,6 @@
 var assert = require("assert");
 var path = require("path");
+var Promise = require("nodegit-promise");
 var fse = require("fs-extra");
 var local = path.join.bind(path, __dirname);
 
@@ -107,4 +108,78 @@ describe("Checkout", function() {
       assert.ok(~packageContent.indexOf("\"ejs\": \"~1.0.0\","));
     });
   });
+
+  it("can checkout an index with conflicts", function() {
+    var test = this;
+
+    var testBranchName = "test";
+    var ourCommit;
+
+    return test.repository.getBranchCommit(checkoutBranchName)
+    .then(function(commit) {
+      ourCommit = commit;
+
+      return test.repository.createBranch(testBranchName, commit.id());
+    })
+    .then(function() {
+      return test.repository.checkoutBranch(testBranchName);
+    })
+    .then(function(branch) {
+      fse.writeFileSync(packageJsonPath, "\n");
+
+      return test.repository.openIndex()
+        .then(function(index) {
+          index.read(1);
+          index.addByPath(packageJsonName);
+          index.write();
+
+          return index.writeTree();
+        });
+    })
+    .then(function(oid) {
+      assert.equal(oid.toString(),
+        "85135ab398976a4d5be6a8704297a45f2b1e7ab2");
+
+      var signature = test.repository.defaultSignature();
+
+      return test.repository.createCommit("refs/heads/" + testBranchName,
+        signature, signature, "we made breaking changes", oid, [ourCommit]);
+    })
+    .then(function(commit) {
+      return Promise.all([
+        test.repository.getBranchCommit(testBranchName),
+        test.repository.getBranchCommit("master")
+      ]);
+    })
+    .then(function(commits) {
+      return NodeGit.Merge.commits(test.repository, commits[0], commits[1],
+        null);
+    })
+    .then(function(index) {
+      assert.ok(index);
+      assert.ok(index.hasConflicts && index.hasConflicts());
+
+      return NodeGit.Checkout.index(test.repository, index);
+    })
+    .then(function() {
+      // Verify that the conflict has been written to disk
+      var conflictedContent = fse.readFileSync(packageJsonPath, "utf-8");
+
+      assert.ok(~conflictedContent.indexOf("<<<<<<< ours"));
+      assert.ok(~conflictedContent.indexOf("======="));
+      assert.ok(~conflictedContent.indexOf(">>>>>>> theirs"));
+
+      // Cleanup
+      var opts = {
+        checkoutStrategy: Checkout.STRATEGY.FORCE,
+        paths: packageJsonName
+      };
+
+      return Checkout.head(test.repository, opts);
+    })
+    .then(function() {
+      var finalContent = fse.readFileSync(packageJsonPath, "utf-8");
+      assert.equal(finalContent, "\n");
+    });
+  });
 });