just some thoughts

database/mysql/CMakeLists.txt

@@ -10,6 +10,6 @@ set(SOURCES
 
 find_package(MariaDB REQUIRED)
 
-target_sources(pica PRIVATE ${SOURCES})
+target_sources(${PROJECT_NAME} PRIVATE ${SOURCES})
 
-target_link_libraries(pica PRIVATE MariaDB::client)
+target_link_libraries(${PROJECT_NAME} PRIVATE MariaDB::client)

database/mysql/mysql.cpp

@@ -116,6 +116,14 @@ void MySQL::executeFile(const std::filesystem::path& relativePath) {
     std::ifstream inputFile(path);
     std::string query;
     while (std::getline(inputFile, query, ';')) {
+        std::optional<std::string> comment = getComment(query);
+        while (comment) {
+            std::cout << '\t' << comment.value() << std::endl;
+            comment = getComment(query);
+        }
+        if (query.empty())
+            continue;
+
         int result = mysql_query(con, query.c_str());
         if (result != 0) {
             int errcode = mysql_errno(con);
@@ -162,15 +170,49 @@ void MySQL::migrate(uint8_t targetVersion) {
     uint8_t currentVersion = getVersion();
 
     while (currentVersion < targetVersion) {
+        if (currentVersion == 255)
+            throw std::runtime_error("Maximum possible database version reached");
+
+        uint8_t nextVersion = currentVersion + 1;
         std::string fileName = "migrations/m" + std::to_string(currentVersion) + ".sql";
         std::cout << "Performing migration "
             << std::to_string(currentVersion)
             << " -> "
-            << std::to_string(++currentVersion)
+            << std::to_string(nextVersion)
         << std::endl;
         executeFile(fileName);
-        setVersion(currentVersion);
+        setVersion(nextVersion);
+        currentVersion = nextVersion;
     }
 
     std::cout << "Database is now on actual version " << std::to_string(targetVersion) << std::endl;
 }
+
+std::optional<std::string> MySQL::getComment(std::string& string) {
+    ltrim(string);
+    if (string.length() < 2)
+        return std::nullopt;
+
+    if (string[0] == '-') {
+        if (string[1] == '-') {
+            string.erase(0, 2);
+            std::string::size_type eol = string.find('\n');
+            return extract(string, 0, eol);
+        }
+    } else if (string[0] == '/') {
+        if (string[1] == '*') {
+            string.erase(0, 2);
+            std::string::size_type end = 0;
+            do {
+                end = string.find(end, '*');
+            } while (end != std::string::npos && end < string.size() - 1 && string[end + 1] == '/');
+            if (end < string.size() - 1)
+                end = std::string::npos;
+
+            return extract(string, 0, end);
+        }
+    }
+
+    return std::nullopt;
+}
+

database/mysql/mysql.h

@@ -5,6 +5,7 @@
 
 #include <stdexcept>
 #include <filesystem>
+#include <optional>
 
 #include <mysql.h>
 
@@ -28,6 +29,7 @@ public:
 
 private:
     void executeFile(const std::filesystem::path& relativePath);
+    static std::optional<std::string> getComment(std::string& string);
 
 protected:
     MYSQL connection;