catch template errors, and start on discarding changes to fields/cards

This is only a first step - all the current methods that implicitly
save need to be updated.

qt/aqt/clayout.py

@@ -11,6 +11,7 @@ import aqt
 from anki.cards import Card
 from anki.consts import *
 from anki.lang import _, ngettext
+from anki.rsbackend import TemplateError
 from anki.utils import isMac, isWin, joinFields
 from aqt import gui_hooks
 from aqt.qt import *
@@ -273,10 +274,15 @@ class CardLayout(QDialog):
             l.addWidget(flip)
             qconnect(flip.clicked, self.onFlip)
         l.addStretch()
-        close = QPushButton(_("Close"))
+        save = QPushButton(_("Save"))
+        save.setAutoDefault(False)
+        l.addWidget(save)
+        qconnect(save.clicked, self.accept)
+
+        close = QPushButton(_("Cancel"))
         close.setAutoDefault(False)
         l.addWidget(close)
-        qconnect(close.clicked, self.accept)
+        qconnect(close.clicked, self.reject)
 
     # Cards
     ##########################################################################
@@ -596,23 +602,37 @@ Enter deck to place new %s cards in, or leave blank:"""
     # Closing & Help
     ######################################################################
 
-    def accept(self):
-        self.reject()
+    def accept(self) -> None:
+        try:
+            self.mm.save(self.model)
+        except TemplateError as e:
+            # fixme: i18n
+            showWarning("Unable to save changes: " + str(e))
+            return
 
-    def reject(self):
+        self.mw.reset()
+        self.cleanup()
+        return QDialog.accept(self)
+
+    def reject(self) -> None:
+        # discard mutations - in the future we should load a fresh
+        # copy at the start instead
+        self.mm._remove_from_cache(self.model["id"])
+        self.cleanup()
+        return QDialog.reject(self)
+
+    def cleanup(self) -> None:
         self.cancelPreviewTimer()
         av_player.stop_and_clear_queue()
+        # fixme
         if self.addMode:
             # remove the filler fields we added
             for name in self.emptyFields:
                 self.note[name] = ""
             self.mw.col.db.execute("delete from notes where id = ?", self.note.id)
-        self.mm.save(self.model, templates=True)
-        self.mw.reset()
         saveGeom(self, "CardLayout")
         self.pform.frontWeb = None
         self.pform.backWeb = None
-        return QDialog.reject(self)
 
     def onHelp(self):
         openHelp("templates")

qt/aqt/fields.py

@@ -4,6 +4,7 @@
 import aqt
 from anki.consts import *
 from anki.lang import _, ngettext
+from anki.rsbackend import TemplateError
 from aqt.qt import *
 from aqt.utils import askUser, getOnlyText, openHelp, showWarning
 
@@ -22,7 +23,8 @@ class FieldDialog(QDialog):
         self.form.setupUi(self)
         self.setWindowTitle(_("Fields for %s") % self.model["name"])
         self.form.buttonBox.button(QDialogButtonBox.Help).setAutoDefault(False)
-        self.form.buttonBox.button(QDialogButtonBox.Close).setAutoDefault(False)
+        self.form.buttonBox.button(QDialogButtonBox.Cancel).setAutoDefault(False)
+        self.form.buttonBox.button(QDialogButtonBox.Save).setAutoDefault(False)
         self.currentIdx = None
         self.oldSortField = self.model["sortf"]
         self.fillFields()
@@ -167,17 +169,24 @@ class FieldDialog(QDialog):
         fld["rtl"] = f.rtl.isChecked()
 
     def reject(self):
+        self.mm._remove_from_cache(self.model["id"])
+        QDialog.reject(self)
+
+    def accept(self):
         self.saveField()
         if self.oldSortField != self.model["sortf"]:
             self.mw.progress.start()
             self.mw.col.updateFieldCache(self.mm.nids(self.model))
             self.mw.progress.finish()
-        self.mm.save(self.model)
-        self.mw.reset()
-        QDialog.reject(self)
+        try:
+            self.mm.save(self.model)
+        except TemplateError as e:
+            # fixme: i18n
+            showWarning("Unable to save changes: " + str(e))
+            return
 
-    def accept(self):
-        self.reject()
+        self.mw.reset()
+        QDialog.accept(self)
 
     def onHelp(self):
         openHelp("fields")

qt/designer/fields.ui

@@ -147,7 +147,7 @@
       <enum>Qt::Horizontal</enum>
      </property>
      <property name="standardButtons">
-      <set>QDialogButtonBox::Close|QDialogButtonBox::Help</set>
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Help|QDialogButtonBox::Save</set>
      </property>
     </widget>
    </item>