feat: Add method for PbxGroup removal and remove group duplication

Author: tdermendjiev

lib/pbxProject.js

@@ -305,6 +305,12 @@ pbxProject.prototype.findMainPbxGroup = function () {
 }
 
 pbxProject.prototype.addPbxGroup = function (filePathsArray, name, path, sourceTree, opt) {
+
+    var oldGroup = this.pbxGroupByName(name);
+    if (oldGroup) { 
+        this.removePbxGroup(name, path);
+    }
+
     var groups = this.hash.project.objects['PBXGroup'],
         pbxGroupUuid = opt.uuid || this.generateUuid(),
         commentKey = f("%s_comment", pbxGroupUuid),
@@ -378,6 +384,39 @@ pbxProject.prototype.addPbxGroup = function (filePathsArray, name, path, sourceT
     return {uuid: pbxGroupUuid, pbxGroup: pbxGroup};
 }
 
+pbxProject.prototype.removePbxGroup = function(name, path) {
+        var group = this.pbxGroupByName(name);
+        if (!group) { 
+            return;
+        }
+    
+    var children = group.children;
+
+    for(i in children) {
+        var file = new pbxFile($path.join(path, children[i].comment));
+        file.fileRef = children[i].value;
+        file.uuid = file.fileRef;     
+        this.removePbxGroup(children[i].comment, $path.join(path, children[i].comment));
+        this.removeFromPbxFileReferenceSection(file);   
+        this.removeFromPbxBuildFileSection(file);
+        this.removeFromPbxSourcesBuildPhase(file);
+    }
+
+    //copied from https://github.com/alunny/node-xcode/blob/master/lib/pbxProject.js#L527
+    var section = this.hash.project.objects['PBXGroup'],
+        key, itemKey;
+
+    for (key in section) {
+        // only look for comments
+        if (!COMMENT_KEY.test(key)) continue;
+
+        if (section[key] == name) {
+            itemKey = key.split(COMMENT_KEY)[0];
+            delete section[itemKey];
+        }
+    }
+}
+
 pbxProject.prototype.addToPbxFileReferenceSection = function (file) {
     var commentKey = f("%s_comment", file.fileRef);
 
@@ -893,7 +932,7 @@ pbxProject.prototype.removeFromHeaderSearchPaths = function (file) {
         INHERITED = '"$(inherited)"',
         SEARCH_PATHS = 'HEADER_SEARCH_PATHS',
         config, buildSettings, searchPaths;
-    var new_path = searchPathForFile(file, this);
+        var new_path = typeof file === 'string' ? file : searchPathForFile(file, this);
 
     for (config in configurations) {
         buildSettings = configurations[config].buildSettings;