[ogs] Adds support for multiple patch files.

Are applied in the given order.

Applications/CLI/ogs.cpp

@@ -81,11 +81,12 @@ int main(int argc, char* argv[])
         "PROJECT_FILE");
     cmd.add(project_arg);
 
-    TCLAP::ValueArg<std::string> xml_patch_file(
+    TCLAP::MultiArg<std::string> xml_patch_files(
         "p", "xml-patch",
-        "the xml patch file which is applied to the PROJECT_FILE", false, "",
-        "XML_PATCH_FILE");
-    cmd.add(xml_patch_file);
+        "the xml patch file(s) which is (are) applied (in the given order) to "
+        "the PROJECT_FILE",
+        false, "");
+    cmd.add(xml_patch_files);
 
     TCLAP::ValueArg<std::string> outdir_arg("o", "output-directory",
                                             "the output directory to write to",
@@ -190,62 +191,70 @@ int main(int argc, char* argv[])
             run_time.start();
 
             std::string prj_file;
-            // read diff
-            if (xml_patch_file.getValue() != "")
+            if (!xml_patch_files.getValue().empty())
             {
-                auto patch = xmlParseFile(xml_patch_file.getValue().c_str());
-                if (patch == NULL)
+                std::string current_prj_file = project_arg.getValue();
+                std::string current_prj_file_base =
+                    BaseLib::extractBaseNameWithoutExtension(current_prj_file);
+                // apply patch files
+                for (const auto& patch_file : xml_patch_files.getValue())
                 {
-                    OGS_FATAL("Error reading XML diff file {:s}.",
-                              xml_patch_file.getValue());
+                    auto patch = xmlParseFile(patch_file.c_str());
+                    if (patch == NULL)
+                    {
+                        OGS_FATAL("Error reading XML diff file {:s}.",
+                                  patch_file);
+                    }
+
+                    auto doc = xmlParseFile(current_prj_file.c_str());
+                    if (doc == NULL)
+                    {
+                        OGS_FATAL("Error reading project file {:s}.",
+                                  current_prj_file);
+                    }
+
+                    auto node = xmlDocGetRootElement(patch);
+                    int rc = 0;
+                    for (node = node ? node->children : NULL; node;
+                         node = node->next)
+                    {
+                        if (node->type != XML_ELEMENT_NODE)
+                            continue;
+
+                        if (!strcmp((char*)node->name, "add"))
+                            rc = xml_patch_add(doc, node);
+                        else if (!strcmp((char*)node->name, "replace"))
+                            rc = xml_patch_replace(doc, node);
+                        else if (!strcmp((char*)node->name, "remove"))
+                            rc = xml_patch_remove(doc, node);
+                        else
+                            rc = -1;
+
+                        if (rc)
+                            break;
+                    }
+
+                    if (rc != 0)
+                    {
+                        OGS_FATAL(
+                            "Error while patching prj file {:s} with patch "
+                            "file "
+                            "{:}.",
+                            project_arg.getValue(), patch_file);
+                    }
+                    current_prj_file_base =
+                        current_prj_file_base + "_" +
+                        BaseLib::extractBaseNameWithoutExtension(patch_file);
+                    current_prj_file = BaseLib::joinPaths(
+                        outdir_arg.getValue(), current_prj_file_base + ".prj");
+
+                    xmlSaveFile(current_prj_file.c_str(), doc);
+
+                    xmlFreeDoc(doc);
+                    xmlFreeDoc(patch);
                 }
-
-                auto doc = xmlParseFile(project_arg.getValue().c_str());
-                if (doc == NULL)
-                {
-                    OGS_FATAL("Error reading project file {:s}.",
-                              project_arg.getValue());
-                }
-
-                auto node = xmlDocGetRootElement(patch);
-                int rc = 0;
-                for (node = node ? node->children : NULL; node;
-                     node = node->next)
-                {
-                    if (node->type != XML_ELEMENT_NODE)
-                        continue;
-
-                    if (!strcmp((char*)node->name, "add"))
-                        rc = xml_patch_add(doc, node);
-                    else if (!strcmp((char*)node->name, "replace"))
-                        rc = xml_patch_replace(doc, node);
-                    else if (!strcmp((char*)node->name, "remove"))
-                        rc = xml_patch_remove(doc, node);
-                    else
-                        rc = -1;
-
-                    if (rc)
-                        break;
-                }
-
-                if (rc != 0)
-                {
-                    OGS_FATAL(
-                        "Error while patching prj file {:s} with patch file "
-                        "{:}.",
-                        project_arg.getValue(), xml_patch_file.getValue());
-                }
-
-                prj_file =
-                    BaseLib::joinPaths(outdir_arg.getValue(),
-                                       BaseLib::extractBaseNameWithoutExtension(
-                                           xml_patch_file.getValue()) +
-                                           ".prj");
-                xmlSaveFile(prj_file.c_str(), doc);
-
-                xmlFreeDoc(doc);
-                xmlFreeDoc(patch);
                 xmlCleanupParser();
+                prj_file = current_prj_file;
             }
             else
             {