add version check for report.conf

Author: cattabiani

src/coreneuron/io/reports/report_configuration_parser.cpp

@@ -25,6 +25,61 @@
 
 namespace coreneuron {
 
+void check_version(const std::string& raw, const int expected_major, const int expected_minor, const std::string& file_name) {
+    // Must start with 'v'
+    if (raw.empty() || raw[0] != 'v') {
+        throw std::runtime_error(
+            "Invalid major version in: \"" + raw + "\". \"" + file_name + "\" may be missing a version line. "
+            "Expected format: v<major>[.<minor>], e.g., v1.3 or v2"
+        );
+    }
+
+    std::string s = raw.substr(1); // strip 'v'
+    int major = 0;
+    int minor = 0;
+
+    size_t dot = s.find('.');
+    std::string major_str = (dot == std::string::npos) ? s : s.substr(0, dot);
+    std::string minor_str = (dot == std::string::npos) ? "" : s.substr(dot + 1);
+
+    // Parse major
+    try {
+        major = std::stoi(major_str);
+    } catch (...) {
+        throw std::runtime_error(
+            "Invalid major version in: \"" + raw + "\". \"" + file_name + "\" may be missing a version line. "
+            "Expected format: v<major>[.<minor>], e.g., v1.3 or v2"
+        );
+    }
+
+    // Major check
+    if (major != expected_major) {
+        throw std::runtime_error(
+            "Expected version \"v" + std::to_string(expected_major) +
+            "\", got \"" + raw + "\". Probably a version mismatch between neurodamus and neuron."
+        );
+    }
+
+    // Parse minor if present
+    if (!minor_str.empty()) {
+        try {
+            minor = std::stoi(minor_str);
+        } catch (...) {
+            throw std::runtime_error("Invalid minor version in: " + raw);
+        }
+
+        if (minor > expected_minor) {
+            std::cerr << "Warning: version minor " << minor
+                      << " is above expected " << expected_minor
+                      << ". Continuing.\n";
+        } else if (minor < expected_minor) {
+            throw std::runtime_error(
+                "Minor version below expected: probably a version mismatch between neurodamus and neuron. Got \"" +
+                raw + "\""
+            );
+        }
+    }
+}
 
 /*
  * Split filter comma separated strings ("mech.var_name") into mech_name and var_name
@@ -68,6 +123,12 @@ std::vector<ReportConfiguration> create_report_configurations(const std::string&
     int target;
     std::ifstream report_conf(conf_file);
 
+    std::string version;
+    report_conf >> version;
+
+    // coreneuron is compatible with: report.conf v1.x or v1
+    check_version(version, 1, 0, "report.conf"); 
+
     int num_reports = 0;
     report_conf >> num_reports;
     std::vector<ReportConfiguration> reports(num_reports);