Move the configuration object to src/common/

src/common/configuration.cpp

@@ -0,0 +1,57 @@
+// yabridge: a Wine VST bridge
+// Copyright (C) 2020  Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "configuration.h"
+
+#include <fnmatch.h>
+#include <toml++/toml.h>
+#include <fstream>
+
+namespace fs = boost::filesystem;
+
+Configuration::Configuration() {}
+
+Configuration::Configuration(const fs::path& config_path,
+                             const fs::path& yabridge_path)
+    : Configuration() {
+    // Will throw a `toml::parsing_error` if the file cannot be parsed. Better
+    // to throw here rather than failing silently since syntax errors would
+    // otherwise be impossible to spot.
+    toml::table table = toml::parse_file(config_path.string());
+
+    const fs::path relative_path =
+        yabridge_path.lexically_relative(config_path.parent_path());
+    for (const auto& [pattern, value] : table) {
+        // First try to match the glob pattern, allow matching an entire
+        // directory for ease of use. If none of the patterns in the file match
+        // the plugin path then everything will be left at the defaults.
+        if (fnmatch(pattern.c_str(), relative_path.c_str(),
+                    FNM_PATHNAME | FNM_LEADING_DIR) != 0) {
+            continue;
+        }
+
+        matched_file = config_path;
+        matched_pattern = pattern;
+
+        // If the table is missing some fields then they will simply be left at
+        // their defaults
+        if (toml::table* config = value.as_table()) {
+            group = (*config)["group"].value<std::string>();
+        }
+
+        break;
+    }
+}