From fc8ff1f1c8a4a5cad88c0735157f3227fc508c6e Mon Sep 17 00:00:00 2001
From: Steve Smith <steve@orderedlist.com>
Date: Mon, 2 Mar 2015 14:23:55 -0500
Subject: [PATCH] Add Diff.prototype.findSimilar

Also DiffFindOptions
---
 generate/input/descriptor.json | 19 ++++++++++++---
 lib/diff.js                    |  7 ++++++
 test/tests/diff.js             | 43 +++++++++++++++++++++++++++++-----
 3 files changed, 60 insertions(+), 9 deletions(-)

diff --git a/generate/input/descriptor.json b/generate/input/descriptor.json
index 46c2fb99a..b1aaf8024 100644
--- a/generate/input/descriptor.json
+++ b/generate/input/descriptor.json
@@ -524,7 +524,20 @@
           "ignore": true
         },
         "git_diff_find_similar": {
-          "ignore": true
+          "args": {
+            "diff": {
+              "isSelf": true
+            },
+            "options": {
+              "isOptional": true
+            }
+          },
+          "return": {
+            "cppClassName": "Number",
+            "jsClassName": "Number",
+            "isErrorCode": true
+          },
+          "isAsync": true
         },
         "git_diff_foreach": {
           "ignore": true
@@ -639,12 +652,12 @@
       }
     },
     "diff_find_options": {
+      "hasConstructor": true,
       "fields": {
         "git_diff_similarity_metric": {
           "ignore": true
         }
-      },
-      "ignore": true
+      }
     },
     "diff_format_email_options": {
       "ignore": true
diff --git a/lib/diff.js b/lib/diff.js
index b0e2eaecf..9f4686c6f 100644
--- a/lib/diff.js
+++ b/lib/diff.js
@@ -56,4 +56,11 @@ Diff.treeToWorkdirWithIndex = function(repo, tree, opts) {
   return treeToWorkdirWithIndex(repo, tree, opts);
 };
 
+// Override Diff.findSimilar to normalize opts
+var findSimilar = Diff.prototype.findSimilar;
+Diff.prototype.findSimilar = function(opts) {
+  opts = normalizeOptions(opts, NodeGit.DiffFindOptions);
+  return findSimilar.call(this, opts);
+};
+
 module.exports = Diff;
diff --git a/test/tests/diff.js b/test/tests/diff.js
index af5c8a259..a47930f6e 100644
--- a/test/tests/diff.js
+++ b/test/tests/diff.js
@@ -14,6 +14,12 @@ describe("Diff", function() {
   var diffFilename = "wddiff.txt";
   var diffFilepath = local("../repos/workdir", diffFilename);
 
+  var moveFromFile = "README.md";
+  var moveToFile = "MOVED_README.md";
+
+  var moveFromPath = local("../repos/workdir", moveFromFile);
+  var moveToPath = local("../repos/workdir", moveToFile);
+
   beforeEach(function() {
     var test = this;
 
@@ -45,6 +51,9 @@ describe("Diff", function() {
 
       return fse.writeFile(diffFilepath, "1 line\n2 line\n3 line\n\n4");
     })
+    .then(function() {
+      return fse.move(moveFromPath, moveToPath);
+    })
     .then(function() {
       return Diff.treeToWorkdirWithIndex(
         test.repository,
@@ -56,7 +65,10 @@ describe("Diff", function() {
       test.workdirDiff = workdirDiff;
     })
     .then(function() {
-      var opts = { flags: Diff.OPTION.INCLUDE_UNTRACKED };
+      var opts = {
+        flags: Diff.OPTION.INCLUDE_UNTRACKED |
+               Diff.OPTION.RECURSE_UNTRACKED_DIRS
+      };
 
       return Diff.indexToWorkdir(test.repository, test.index, opts);
     })
@@ -66,6 +78,9 @@ describe("Diff", function() {
     .then(function() {
       return fse.remove(diffFilepath);
     })
+    .then(function() {
+      return fse.move(moveToPath, moveFromPath);
+    })
     .catch(function(e) {
       return fse.remove(diffFilepath)
         .then(function() {
@@ -106,14 +121,14 @@ describe("Diff", function() {
 
   it("can diff the workdir with index", function() {
     var patches = this.workdirDiff.patches();
-    assert.equal(patches.length, 1);
-    assert(patches[0].isUntracked());
+    assert.equal(patches.length, 3);
+    assert(patches[2].isUntracked());
 
-    var oldFile = patches[0].delta.oldFile();
+    var oldFile = patches[2].delta.oldFile();
     assert.equal(oldFile.path(), "wddiff.txt");
     assert.equal(oldFile.size(), 0);
 
-    var newFile = patches[0].delta.newFile();
+    var newFile = patches[2].delta.newFile();
     assert.equal(newFile.path(), "wddiff.txt");
     assert.equal(newFile.size(), 23);
   });
@@ -151,6 +166,22 @@ describe("Diff", function() {
   });
 
   it("can diff index to workdir", function() {
-    assert.equal(this.indexToWorkdirDiff.patches().length, 1);
+    assert.equal(this.indexToWorkdirDiff.patches().length, 3);
+  });
+
+  it("can find similar files in a diff", function() {
+    var diff = this.indexToWorkdirDiff;
+    var opts = {
+      flags: Diff.FIND.RENAMES |
+             Diff.FIND.RENAMES_FROM_REWRITES |
+             Diff.FIND.FOR_UNTRACKED
+    };
+
+    assert.equal(diff.patches().length, 3);
+
+    diff.findSimilar(opts).then(function() {
+      // Renamed file now treated as one diff, so 3 patches -> 2
+      assert.equal(diff.patches().length, 2);
+    });
   });
 });