Core: update ConfigReader

src/core/config/ConfigReader.cpp

 /**
  * @file
  * @brief Implementation of config reader
- * @copyright Copyright (c) 2017 CERN and the Allpix Squared authors.
+ * @copyright Copyright (c) 2017 CERN and the Corryvreckan authors.
  * This software is distributed under the terms of the MIT License, copied verbatim in the file "LICENSE.md".
  * In applying this license, CERN does not waive the privileges and immunities granted to it by virtue of its status as an
  * Intergovernmental Organization or submit itself to any jurisdiction.
@@ -127,16 +127,29 @@ void ConfigReader::add(std::istream& stream, std::string file_name) {
         }
 
         // Check if section header or key-value pair
-        if(line.front() == '[' && line[line.length() - 1] == ']') {
-            // Ignore empty sections if they contain no configurations
-            if(!conf.getName().empty() || conf.countSettings() > 0) {
-                // Add previous section
-                addConfiguration(std::move(conf));
+        if(line.front() == '[') {
+            // Line should be a section header with an alphanumeric name
+            size_t idx = 1;
+            for(; idx < line.length() - 1; ++idx) {
+                if(isalnum(line[idx]) == 0 && line[idx] != '_') {
+                    break;
+                }
             }
+            std::string remain = corryvreckan::trim(line.substr(idx + 1));
+            if(line[idx] == ']' && (remain.empty() || remain.front() == '#')) {
+                // Ignore empty sections if they contain no configurations
+                if(!conf.getName().empty() || conf.countSettings() > 0) {
+                    // Add previous section
+                    addConfiguration(std::move(conf));
+                }
 
-            // Begin new section
-            section_name = std::string(line, 1, line.length() - 2);
-            conf = Configuration(section_name, file_name);
+                // Begin new section
+                section_name = std::string(line, 1, idx - 1);
+                conf = Configuration(section_name, file_name);
+            } else {
+                // Section header is not valid
+                throw ConfigParseError(file_name, line_num);
+            }
         } else if(isalpha(line.front()) != 0) {
             // Line should be a key / value pair with an equal sign
             try {

src/core/config/ConfigReader.hpp

 /**
  * @file
  * @brief Provides a reader for configuration files
- * @copyright Copyright (c) 2017 CERN and the Allpix Squared authors.
+ * @copyright Copyright (c) 2017 CERN and the Corryvreckan authors.
  * This software is distributed under the terms of the MIT License, copied verbatim in the file "LICENSE.md".
  * In applying this license, CERN does not waive the privileges and immunities granted to it by virtue of its status as an
  * Intergovernmental Organization or submit itself to any jurisdiction.