add is_default script function

src/data/field.cpp

@@ -305,6 +305,10 @@ bool Value::equals(const Value* that) {
   return this == that;
 }
 
+bool Value::isDefault() {
+  return false;
+}
+
 bool Value::update(Context& ctx) {
   updateAge();
   updateSortValue(ctx);

src/data/field.hpp

@@ -255,7 +255,9 @@ public:
   virtual ValueP clone() const = 0;
 
   /// Convert this value to a string for use in tables
-  virtual String toString() const = 0;
+  virtual String toString() const = 0;
+  /// Check if this value is in the default state
+  virtual bool isDefault();
   /// Apply scripts to this value, return true if the value has changed
   virtual bool update(Context& ctx);
   /// This value has been updated by an action

src/data/field/choice.cpp

@@ -317,7 +317,12 @@ ChoiceValue::ChoiceValue(const ChoiceFieldP& field, bool initial_first_choice)
 
 String ChoiceValue::toString() const {
   return value();
-}
+}
+
+bool ChoiceValue::isDefault() {
+  return value.isDefault();
+}
+
 bool ChoiceValue::update(Context& ctx) {
   bool change = field().default_script.invokeOnDefault(ctx, value)
               | field().        script.invokeOn(ctx, value);

src/data/field/choice.hpp

@@ -199,7 +199,9 @@ public:
   DECLARE_VALUE_TYPE(Choice, Defaultable<String>);
   
   ValueType value;  /// The name of the selected choice
-  
+
+  bool isDefault() override;
+
   bool update(Context&) override;
 };
 

src/data/field/color.cpp

@@ -110,7 +110,12 @@ String ColorValue::toString() const {
     if (value() == c->color) return c->name;
   }
   return _("<color>");
+}
+
+bool ColorValue::isDefault() {
+  return value.isDefault();
 }
+
 bool ColorValue::update(Context& ctx) {
   bool change = field().default_script.invokeOnDefault(ctx, value)
               | field().        script.invokeOn(ctx, value);

src/data/field/color.hpp

@@ -77,7 +77,9 @@ public:
   DECLARE_VALUE_TYPE(Color, Defaultable<Color>);
   
   ValueType value;  ///< The value
-  
+
+  bool isDefault() override;
+
   bool update(Context&) override;
 };
 

src/data/field/image.cpp

@@ -39,6 +39,10 @@ String ImageValue::toString() const {
   return filename.empty() ? _("") : _("<image>");
 }
 
+bool ImageValue::isDefault() {
+  return filename.empty();
+}
+
 // custom reflection: convert to ScriptImageP for scripting
 
 void ImageValue::reflect(Reader& handler) {

src/data/field/image.hpp

@@ -47,7 +47,9 @@ public:
   }
 
   ValueType filename;    ///< Filename of the image (in the current package), or ""
-  Age       last_update; ///< When was the image last changed?
+  Age       last_update; ///< When was the image last changed?
+
+  bool isDefault() override;
 };
 
 // ----------------------------------------------------------------------------- : ImageStyle

src/data/field/information.cpp

@@ -62,7 +62,12 @@ IMPLEMENT_REFLECTION(InfoStyle) {
 
 String InfoValue::toString() const {
   return value;
+}
+
+bool InfoValue::isDefault() {
+  return true;
 }
+
 bool InfoValue::update(Context& ctx) {
   if (value.empty()) value = field().caption.get();
   bool change = field().script.invokeOn(ctx, value);

src/data/field/information.hpp

@@ -60,7 +60,9 @@ public:
   DECLARE_VALUE_TYPE(Info, String);
   
   ValueType value;
-  
+
+  bool isDefault() override;
+
   bool update(Context&) override;
 };
 

src/data/field/multiple_choice.cpp

@@ -52,6 +52,10 @@ IMPLEMENT_REFLECTION_NAMELESS(MultipleChoiceValue) {
   REFLECT_BASE(ChoiceValue);
 }
 
+bool MultipleChoiceValue::isDefault() {
+  return value.isDefault();
+}
+
 bool MultipleChoiceValue::update(Context& ctx) {
   String old_value = value();
   ctx.setVariable(_("last_change"), to_script(last_change));

src/data/field/multiple_choice.hpp

@@ -63,7 +63,9 @@ public:
   
   /// Splits the value, stores the selected choices in the out parameter
   void get(vector<String>& out) const;
-  
+
+  bool isDefault() override;
+
   bool update(Context&) override;
   
 private:

src/data/field/package_choice.cpp

@@ -62,6 +62,12 @@ PackagedP PackageChoiceValue::getPackage() const {
   else return package_manager.openAny(package_name, true);
 }
 
+bool PackageChoiceValue::isDefault() {
+  PackageChoiceFieldP packageFieldP = boost::dynamic_pointer_cast<PackageChoiceField>(fieldP);
+  if (packageFieldP) return package_name == packageFieldP->initial;
+  return false;
+}
+
 bool PackageChoiceValue::update(Context& ctx) {
   bool change = field().script.invokeOn(ctx, package_name);
   Value::update(ctx);

src/data/field/package_choice.hpp

@@ -61,7 +61,9 @@ public:
   
   /// Get the package (if it is set), otherwise return nullptr
   PackagedP getPackage() const;
-  
+
+  bool isDefault() override;
+
   bool update(Context&) override;
 };
 

src/data/field/symbol.cpp

@@ -51,6 +51,10 @@ String SymbolValue::toString() const {
   return filename.empty() ? _("") : _("<symbol>");
 }
 
+bool SymbolValue::isDefault() {
+  return filename.empty();
+}
+
 IMPLEMENT_REFLECTION_NO_GET_MEMBER(SymbolValue) {
   if (fieldP->save_value || !handler.isWriting) REFLECT_NAMELESS(filename);
 }

src/data/field/symbol.hpp

@@ -69,6 +69,8 @@ public:
   DECLARE_VALUE_TYPE(Symbol, LocalFileName);
   
   ValueType filename;    ///< Filename of the symbol (in the current package)
-  Age       last_update; ///< When was the symbol last changed?
+  Age       last_update; ///< When was the symbol last changed?
+
+  bool isDefault() override;
 };
 

src/data/field/text.cpp

@@ -176,7 +176,12 @@ IMPLEMENT_REFLECTION(TextStyle) {
 
 String TextValue::toString() const {
   return untag_hide_sep(value());
+}
+
+bool TextValue::isDefault() {
+  return value.isDefault();
 }
+
 bool TextValue::update(Context& ctx) {
   updateAge();
   WITH_DYNAMIC_ARG(last_update_age,     last_update.get());

src/data/field/text.hpp

@@ -112,7 +112,9 @@ public:
   
   ValueType value;                ///< The text of this value
   Age       last_update;          ///< When was the text last changed?
-  
+
+  bool isDefault() override;
+
   bool update(Context&) override;
 };