Add PluginInterface::GetHeaderVersion()

include/loot/plugin_interface.h

@@ -45,6 +45,14 @@ public:
    */
   virtual std::string GetName() const = 0;
 
+  /**
+   * Get the value of the version field in the HEDR subrecord of the plugin's
+   * TES4 record.
+   * @return The value of the version field, or NaN if the field could not be
+   *         found.
+   */
+  virtual float GetHeaderVersion() const = 0;
+
   /**
    * Get the plugin's version number from its description field.
    *

src/api/plugin.cpp

@@ -131,6 +131,17 @@ Plugin::Plugin(const GameType gameType,
 
 std::string Plugin::GetName() const { return name_; }
 
+float Plugin::GetHeaderVersion() const {
+  float version;
+  auto ret = esp_plugin_header_version(esPlugin.get(), &version);
+  if (ret != ESP_OK) {
+    throw FileAccessError(name_ +
+      " : esplugin error code: " + std::to_string(ret));
+  }
+
+  return version;
+}
+
 std::optional<std::string> Plugin::GetVersion() const {
   std::string version = Version(GetDescription()).AsString();
   if (version.empty()) {

src/api/plugin.h

@@ -50,6 +50,7 @@ public:
          const bool headerOnly);
 
   std::string GetName() const;
+  float GetHeaderVersion() const;
   std::optional<std::string> GetVersion() const;
   std::vector<std::string> GetMasters() const;
   std::set<Tag> GetBashTags() const;

src/tests/api/internals/plugin_test.h

@@ -125,6 +125,7 @@ private:
 class OtherPluginType : public PluginInterface {
 public:
   std::string GetName() const { return ""; }
+  float GetHeaderVersion() const { return 0.0f; }
   std::optional<std::string> GetVersion() const { return std::nullopt; }
   std::vector<std::string> GetMasters() const {
     return std::vector<std::string>();
@@ -173,6 +174,12 @@ TEST_P(PluginTest, loadingHeaderOnlyShouldReadHeaderData) {
   EXPECT_TRUE(plugin.IsMaster());
   EXPECT_FALSE(plugin.IsEmpty());
   EXPECT_EQ("5.0", plugin.GetVersion());
+
+  if (GetParam() == GameType::tes4) {
+    EXPECT_FLOAT_EQ(0.8f, plugin.GetHeaderVersion());
+  } else {
+    EXPECT_FLOAT_EQ(0.94f, plugin.GetHeaderVersion());
+  }
 }
 
 TEST_P(PluginTest, loadingHeaderOnlyShouldNotReadFieldsOrCalculateCrc) {
@@ -197,6 +204,12 @@ TEST_P(PluginTest, loadingWholePluginShouldReadHeaderData) {
   EXPECT_TRUE(plugin.IsMaster());
   EXPECT_FALSE(plugin.IsEmpty());
   EXPECT_EQ("5.0", plugin.GetVersion());
+
+  if (GetParam() == GameType::tes4) {
+    EXPECT_FLOAT_EQ(0.8f, plugin.GetHeaderVersion());
+  } else {
+    EXPECT_FLOAT_EQ(0.94f, plugin.GetHeaderVersion());
+  }
 }
 
 TEST_P(PluginTest, loadingWholePluginShouldReadFields) {