Rewrite Undo/Redo code

Make the undo and redo stacks non-static members of AssFile, making it
theoretically possible to have multiple open AssFiles with working undo.

Slightly improve tracking of whether the file is modified: saving,
making a change, then undoing the change now results in the file being
shown as unmodified as with most programs with undo.

Add basic undo coalescing support.

Originally committed to SVN as r4667.

aegisub/src/ass_file.cpp

@@ -61,10 +61,17 @@
 #include "utils.h"
 #include "version.h"
 
+namespace std {
+	template<>
+	void swap(AssFile &lft, AssFile &rgt) {
+		lft.swap(rgt);
+	}
+}
+
 /// @brief AssFile constructor
-AssFile::AssFile () {
+AssFile::AssFile ()
-	loaded = false;
+: loaded(false)
-	Modified = false;
+{
 }
 
 /// @brief AssFile destructor 
@@ -74,6 +81,7 @@ AssFile::~AssFile() {
 
 void AssFile::Load (const wxString &_filename,wxString charset,bool addToRecent) {
 	bool ok = false;
+	Clear();
 
 	try {
 		// Try to open file
@@ -141,6 +149,10 @@ void AssFile::Load (const wxString &_filename,wxString charset,bool addToRecent)
 	AddComment(_T("http://www.aegisub.org/"));
 	SetScriptInfo(_T("ScriptType"),_T("v4.00+"));
 
+	// Push the initial state of the file onto the undo stack
+	Commit("", commitId);
+	savedCommitId = commitId;
+
 	// Add to recent
 	if (addToRecent) AddToRecent(_filename);
 }
@@ -171,7 +183,7 @@ void AssFile::Save(wxString _filename,bool setfilename,bool addToRecent,const wx
 
 	// Done
 	if (setfilename) {
-		Modified = false;
+		savedCommitId = commitId;
 		filename = _filename;
 	}
 }
@@ -416,7 +428,11 @@ void AssFile::Clear() {
 
 	loaded = false;
 	filename.clear();
-	Modified = false;
+	UndoStack.clear();
+	RedoStack.clear();
+	undoDescription.clear();
+	commitId = -1;
+	savedCommitId = 0;
 }
 
 void AssFile::LoadDefault (bool defline) {
@@ -445,20 +461,30 @@ void AssFile::LoadDefault (bool defline) {
 		AddLine(def.GetEntryData(),_T("[Events]"),version);
 	}
 
+	Commit("");
+	savedCommitId = commitId;
 	loaded = true;
 }
 
-AssFile::AssFile (const AssFile &from) {
+void AssFile::swap(AssFile &that) throw() {
-	filename = from.filename;
+	// Intentionally does not swap undo stack related things
-	loaded = from.loaded;
+	std::swap(filename, that.filename);
-	Modified = from.Modified;
+	std::swap(loaded, that.loaded);
+	std::swap(commitId, that.commitId);
+	std::swap(undoDescription, that.undoDescription);
+	std::swap(Line, that.Line);
+}
+
+AssFile::AssFile(const AssFile &from)
+: undoDescription(from.undoDescription)
+, commitId(from.commitId)
+, filename(from.filename)
+, loaded(from.loaded)
+{
 	std::transform(from.Line.begin(), from.Line.end(), std::back_inserter(Line), std::mem_fun(&AssEntry::Clone));
 }
 AssFile& AssFile::operator=(AssFile from) {
-	filename = from.filename;
+	std::swap(*this, from);
-	loaded = from.loaded;
-	Modified = from.Modified;
-	std::swap(Line, from.Line);
 	return *this;
 }
 
@@ -747,120 +773,55 @@ void AssFile::CompressForStack() {
 	}
 }
 
-bool AssFile::IsModified() {
+int AssFile::Commit(wxString desc, int amendId) {
-	return Modified;
+	++commitId;
-}
+	// Allow coalescing only if it's the last change and the file has not been
-
+	// saved since the last change
-void AssFile::FlagAsModified(wxString desc) {
+	if (commitId == amendId+1 && RedoStack.empty() && savedCommitId != commitId) {
-	if (!RedoStack.empty()) {
+		UndoStack.back() = *this;
-		delete_clear(RedoStack);
+		UndoStack.back().CompressForStack();
+		return commitId;
 	}
 
-	Modified = true;
+	RedoStack.clear();
-	StackPush(desc);
-}
 
-void AssFile::StackPush(wxString desc) {
+	// Place copy on stack
-	// Places copy on stack
+	undoDescription = desc;
-	AssFile *curcopy = new AssFile(*top);
+	UndoStack.push_back(*this);
-	curcopy->CompressForStack();
+	UndoStack.back().CompressForStack();
-	curcopy->undodescription = desc;
-	UndoStack.push_back(curcopy);
-	StackModified = true;
 
 	// Cap depth
-	int n = 0;
-	for (std::list<AssFile*>::iterator cur=UndoStack.begin();cur!=UndoStack.end();cur++) {
-		n++;
-	}
 	int depth = OPT_GET("Limits/Undo Levels")->GetInt();
-	while (n > depth) {
+	while ((int)UndoStack.size() > depth) {
-		delete UndoStack.front();
 		UndoStack.pop_front();
-		n--;
 	}
+
+	return commitId;
 }
 
-void AssFile::StackPop() {
+void AssFile::Undo() {
-	bool addcopy = false;
+	if (UndoStack.size() <= 1) return;
-	wxString undodesc="";
 
-
+	RedoStack.push_back(AssFile());
-	if (StackModified) {
+	std::swap(RedoStack.back(), *this);
-		undodesc=UndoStack.back()->undodescription;
-		delete UndoStack.back();
 	UndoStack.pop_back();
-		StackModified = false;
+	*this = UndoStack.back();
-		addcopy = true;
-	}
-
-	if (!UndoStack.empty()) {
-		//delete top;
-		AssFile *undo = UndoStack.back();
-		top->CompressForStack();
-		top->undodescription = undodesc;
-		RedoStack.push_back(top);
-		top = undo;
-		UndoStack.pop_back();
-		Popping = true;
-	}
-
-	if (addcopy) {
-		StackPush(top->undodescription);
-	}
 }
 
-void AssFile::StackRedo() {
+void AssFile::Redo() {
-	bool addcopy = false;
+	if (RedoStack.empty()) return;
-	if (StackModified) {
-		delete UndoStack.back();
-		UndoStack.pop_back();
-		StackModified = false;
-		addcopy = true;
-	}
 
-	if (!RedoStack.empty()) {
+	std::swap(*this, RedoStack.back());
-		top->CompressForStack();
+	UndoStack.push_back(*this);
-		UndoStack.push_back(top);
-		top = RedoStack.back();
 	RedoStack.pop_back();
-		Popping = true;
-	}
-
-	if (addcopy) {
-		StackPush(top->undodescription);
-	}
 }
 
-void AssFile::StackClear() {
+wxString AssFile::GetUndoDescription() const {
-	delete_clear(UndoStack);
+	return IsUndoStackEmpty() ? "" : UndoStack.back().undoDescription;
-	delete_clear(RedoStack);
-
-	Popping = false;
 }
 
-void AssFile::StackReset() {
+wxString AssFile::GetRedoDescription() const {
-	StackClear();
+	return IsRedoStackEmpty() ? "" : RedoStack.back().undoDescription;
-	delete top;
-	top = new AssFile;
-	StackModified = false;
-}
-
-bool AssFile::IsUndoStackEmpty() {
-	if (StackModified) return (UndoStack.size() <= 1);
-	else return UndoStack.empty();
-}
-
-bool AssFile::IsRedoStackEmpty() {
-	return RedoStack.empty();
-}
-
-wxString AssFile::GetUndoDescription() {
-	return (IsUndoStackEmpty())?_T(""):(UndoStack.back())->undodescription;
-}
-
-wxString AssFile::GetRedoDescription() {
-	return (IsRedoStackEmpty())?_T(""):(RedoStack.back())->undodescription;
 }
 
 bool AssFile::CompStart(const AssDialogue* lft, const AssDialogue* rgt) {
@@ -909,7 +870,3 @@ void AssFile::Sort(std::list<AssDialogue*> &lst, CompFunc comp) {
 }
 
 AssFile *AssFile::top;
-std::list<AssFile*> AssFile::UndoStack;
-std::list<AssFile*> AssFile::RedoStack;
-bool AssFile::Popping;
-bool AssFile::StackModified;

aegisub/src/ass_file.h

@@ -62,26 +62,15 @@ typedef std::list<AssEntry*>::iterator entryIter;
 ///
 /// DOCME
 class AssFile {
-private:
+	std::list<AssFile> UndoStack;
-
+	std::list<AssFile> RedoStack;
-	/// DOCME
+	wxString undoDescription;
-	bool Modified;
+	/// Revision counter for undo coalescing and modified state tracking
-
+	int commitId;
-
+	/// Last saved version of this file
-	/// DOCME
+	int savedCommitId;
-	static std::list<AssFile*> UndoStack;
-
-	/// DOCME
-	static std::list<AssFile*> RedoStack;
-
-	/// DOCME
-	static bool StackModified;
-	static void StackClear();
-
-	wxString undodescription;
 
 public:
-
 	/// The lines in the file
 	std::list<AssEntry*> Line;
 	/// The filename of this file, if any
@@ -95,12 +84,10 @@ public:
 	~AssFile();
 
 	/// Does the file have unsaved changes?
-	bool IsModified();
+	bool IsModified() const {return commitId != savedCommitId; };
-	/// @brief Flag the file as modified and push a copy onto the undo stack
-	/// @param desc Undo description
-	void FlagAsModified(wxString desc);
 	/// Clear the file
 	void Clear();
+
 	/// Discard some parsed data to reduce the size of the undo stack
 	void CompressForStack();
 	/// @brief Load default file
@@ -119,6 +106,7 @@ public:
 	/// @return Pointer to style or NULL
 	AssStyle *GetStyle(wxString name);
 
+	void swap(AssFile &) throw();
 
 	/// @brief Load from a file
 	/// @param file File name
@@ -164,26 +152,23 @@ public:
 	/// @param[out] outGroup Group it was actually added to; attachments do something strange here
 	void AddLine(wxString data,wxString group,int &version,wxString *outGroup=NULL);
 
-	/// Pop subs from stack and set 'top' to it
+	/// @brief Flag the file as modified and push a copy onto the undo stack
-	static void StackPop();
+	/// @param desc     Undo description
-	/// Redo action on stack
+	/// @param commitId Commit to amend rather than pushing a new commit
-	static void StackRedo();
+	/// @return Unique identifier for the new undo group
-	/// @brief Put a copy of 'top' on the stack
+	int Commit(wxString desc, int commitId = -1);
-	/// @param desc Undo message
+	/// @brief Undo the last set of changes to the file
-	static void StackPush(wxString desc);
+	void Undo();
-	/// Clear the stack. Do before loading new subtitles.
+	/// @brief Redo the last undone changes
-	static void StackReset();
+	void Redo();
 	/// Check if undo stack is empty
-	static bool IsUndoStackEmpty();
+	bool IsUndoStackEmpty() const { return UndoStack.size() <= 1; };
 	/// Check if redo stack is empty
-	static bool IsRedoStackEmpty();
+	bool IsRedoStackEmpty() const { return RedoStack.empty(); };
 	/// Get the description of the first undoable change
-	static wxString GetUndoDescription();
+	wxString GetUndoDescription() const;
 	/// Get the description of the first redoable change
-	static wxString GetRedoDescription();
+	wxString GetRedoDescription() const;
-
-	/// Flags the stack as popping. You must unset this after popping
-	static bool Popping;
 
 	/// Current script file. It is "above" the stack.
 	static AssFile *top;

aegisub/src/audio_display.cpp

@@ -1209,7 +1209,7 @@ void AudioDisplay::CommitChanges (bool nextLine) {
 
 		// Update grid
 		grid->editBox->Update(!karaoke->enabled);
-		grid->ass->FlagAsModified(_T(""));
+		grid->ass->Commit(_T(""));
 		grid->CommitChanges();
 		karaoke->SetSelection(karaSelStart, karaSelEnd);
 		blockUpdate = false;

aegisub/src/auto4_lua_assfile.cpp

@@ -1014,7 +1014,7 @@ namespace Automation4 {
 			description = wxString(lua_tostring(L, 1), wxConvUTF8);
 			lua_pop(L, 1);
 		}
-		AssFile::top->FlagAsModified(description);
+		AssFile::top->Commit(description);
 
 		laf->ass = AssFile::top; // make sure we're still working on the most recent undo point
 		return 0;

aegisub/src/dialog_attachments.cpp

@@ -174,7 +174,7 @@ DialogAttachments::~DialogAttachments() {
 	}
 
 	if (removed_any) {
-		AssFile::top->FlagAsModified(_("remove empty attachments sections"));
+		AssFile::top->Commit(_("remove empty attachments sections"));
 	}
 }
 
@@ -223,7 +223,7 @@ void DialogAttachments::OnAttachFont(wxCommandEvent &event) {
 		AssFile::top->InsertAttachment(newAttach);
 	}
 
-	AssFile::top->FlagAsModified(_("attach font file"));
+	AssFile::top->Commit(_("attach font file"));
 
 	// Update
 	UpdateList();
@@ -261,7 +261,7 @@ void DialogAttachments::OnAttachGraphics(wxCommandEvent &event) {
 		AssFile::top->InsertAttachment(newAttach);
 	}
 
-	AssFile::top->FlagAsModified(_("attach graphics file"));
+	AssFile::top->Commit(_("attach graphics file"));
 
 	// Update
 	UpdateList();
@@ -316,7 +316,7 @@ void DialogAttachments::OnDelete(wxCommandEvent &event) {
 		i = listView->GetNextSelected(i);
 	}
 
-	AssFile::top->FlagAsModified(_("remove attachment"));
+	AssFile::top->Commit(_("remove attachment"));
 
 	// Update list
 	UpdateList();

aegisub/src/dialog_fonts_collector.cpp

@@ -514,7 +514,7 @@ void FontsCollectorThread::Collect() {
 			// Modify file if it was attaching
 			if (oper == 3 && someOk) {
 				wxMutexGuiEnter();
-				subs->FlagAsModified(_("font attachment"));
+				subs->Commit(_("font attachment"));
 				collector->main->SubsGrid->CommitChanges();
 				wxMutexGuiLeave();
 			}

aegisub/src/dialog_kara_timing_copy.cpp

@@ -940,7 +940,7 @@ void DialogKanjiTimer::OnClose(wxCommandEvent &event) {
 		line->Text = p.second;
 	}
 	if (modified) {
-		grid->ass->FlagAsModified(_("kanji timing"));
+		grid->ass->Commit(_("kanji timing"));
 		grid->CommitChanges();
 		grid->UpdateMaps();
 		LinesToChange.clear();

aegisub/src/dialog_properties.cpp

@@ -211,7 +211,7 @@ void DialogProperties::OnOK(wxCommandEvent &event) {
 	count += SetInfoIfDifferent(_T("Collisions"),col[collision->GetSelection()]);
 	count += SetInfoIfDifferent(_T("ScaledBorderAndShadow"),ScaleBorder->GetValue()? _T("yes") : _T("no"));
 
-	if (count) AssFile::top->FlagAsModified(_("property changes"));
+	if (count) AssFile::top->Commit(_("property changes"));
 
 	EndModal(count?1:0);
 }

aegisub/src/dialog_resample.cpp

@@ -321,7 +321,7 @@ void DialogResample::OnResample (wxCommandEvent &event) {
 	subs->SetScriptInfo(_T("PlayResY"),wxString::Format(_T("%i"),y2));
 
 	// Flag as modified
-	subs->FlagAsModified(_("resolution resampling"));
+	subs->Commit(_("resolution resampling"));
 	grid->CommitChanges();
 	grid->editBox->Update();
 	EndModal(0);

aegisub/src/dialog_search_replace.cpp

@@ -437,7 +437,7 @@ void SearchReplaceEngine::ReplaceNext(bool DoReplace) {
 			}
 
 			// Commit
-			grid->ass->FlagAsModified(_("replace"));
+			grid->ass->Commit(_("replace"));
 			grid->CommitChanges();
 		}
 
@@ -544,7 +544,7 @@ void SearchReplaceEngine::ReplaceAll() {
 
 	// Commit
 	if (count > 0) {
-		grid->ass->FlagAsModified(_("replace"));
+		grid->ass->Commit(_("replace"));
 		grid->CommitChanges();
 		grid->editBox->Update();
 		wxMessageBox(wxString::Format(_("%i matches were replaced."),count));

aegisub/src/dialog_shift_times.cpp

@@ -311,7 +311,7 @@ void DialogShiftTimes::OnOK(wxCommandEvent &event) {
 	OPT_SET("Tool/Shift Times/Direction")->SetBool(backward);
 
 	// End dialog
-	grid->ass->FlagAsModified(_("shifting"));
+	grid->ass->Commit(_("shifting"));
 	grid->CommitChanges();
 	grid->UpdateMaps();
 	grid->editBox->Update();

aegisub/src/dialog_spellchecker.cpp

@@ -390,7 +390,7 @@ void DialogSpellChecker::Replace() {
 	lastPos = wordStart + replaceWord->GetValue().Length();
 
 	// Commit
-	grid->ass->FlagAsModified(_("Spell check replace"));
+	grid->ass->Commit(_("Spell check replace"));
 	grid->CommitChanges();
 }
 

aegisub/src/dialog_style_editor.cpp

@@ -581,7 +581,7 @@ void DialogStyleEditor::Apply (bool apply,bool close) {
 		*style = *work;
 		style->UpdateData();
 		if (isLocal) {
-			AssFile::top->FlagAsModified(_("style change"));
+			AssFile::top->Commit(_("style change"));
 			grid->CommitChanges();
 		}
 

aegisub/src/dialog_style_manager.cpp

@@ -576,7 +576,7 @@ void DialogStyleManager::OnCopyToCurrent (wxCommandEvent &) {
 	for (list<wxString>::iterator name = copied.begin(); name != copied.end(); ++name) {
 		CurrentList->SetStringSelection(*name, true);
 	}
-	grid->ass->FlagAsModified(_("style copy"));
+	grid->ass->Commit(_("style copy"));
 	grid->CommitChanges();
 	wxCommandEvent dummy;
 	OnCurrentChange(dummy);
@@ -625,7 +625,7 @@ void DialogStyleManager::OnCurrentCopy (wxCommandEvent &) {
 	}
 	else delete temp;
 
-	grid->ass->FlagAsModified(_("style copy"));
+	grid->ass->Commit(_("style copy"));
 	grid->CommitChanges();
 	UpdateMoveButtons();
 }
@@ -678,7 +678,7 @@ void DialogStyleManager::PasteToCurrent() {
 				AssFile::top->InsertStyle(s);
 				LoadCurrentStyles(AssFile::top);
 
-				grid->ass->FlagAsModified(_("style paste"));
+				grid->ass->Commit(_("style paste"));
 				grid->CommitChanges();
 			}
 			else
@@ -822,7 +822,7 @@ void DialogStyleManager::OnCurrentDelete (wxCommandEvent &) {
 		CurrentCopy->Enable(false);
 		CurrentDelete->Enable(false);
 
-		grid->ass->FlagAsModified(_("style delete"));
+		grid->ass->Commit(_("style delete"));
 		grid->CommitChanges();
 	}
 	UpdateMoveButtons();
@@ -884,7 +884,7 @@ void DialogStyleManager::OnCurrentImport(wxCommandEvent &) {
 			// Update
 			if (modified) {
 				LoadCurrentStyles(grid->ass);
-				grid->ass->FlagAsModified(_("style import"));
+				grid->ass->Commit(_("style import"));
 				grid->CommitChanges();
 			}
 		}
@@ -1081,7 +1081,7 @@ void DialogStyleManager::MoveStyles(bool storage, int type) {
 		}
 
 		// Flag as modified
-		grid->ass->FlagAsModified(_("style move"));
+		grid->ass->Commit(_("style move"));
 		grid->CommitChanges();
 	}
 

aegisub/src/dialog_styling_assistant.cpp

@@ -169,7 +169,7 @@ wxDialog (parent, -1, _("Styling assistant"), wxDefaultPosition, wxDefaultSize,
 DialogStyling::~DialogStyling () {
 	GetPosition(&lastx, &lasty);
 	if (needCommit) {
-		grid->ass->FlagAsModified(_("style changes"));
+		grid->ass->Commit(_("style changes"));
 		grid->CommitChanges();
 	}
 }
@@ -232,7 +232,7 @@ void DialogStyling::SetStyle (wxString curName, bool jump) {
 	// Update grid/subs
 	grid->Refresh(false);
 	if (PreviewCheck->IsChecked()) {
-		grid->ass->FlagAsModified(_("styling assistant"));
+		grid->ass->Commit(_("styling assistant"));
 		grid->CommitChanges();
 	}
 	else needCommit = true;
@@ -264,7 +264,7 @@ void DialogStyling::OnActivate(wxActivateEvent &event) {
 	// Dialog lost focus
 	if (!event.GetActive()) {
 		if (needCommit) {
-			grid->ass->FlagAsModified(_("styling assistant"));
+			grid->ass->Commit(_("styling assistant"));
 			grid->CommitChanges();
 			needCommit = false;
 		}

aegisub/src/dialog_timing_processor.cpp

@@ -542,6 +542,6 @@ void DialogTimingProcessor::Process() {
 	}
 
 	// Update grid
-	grid->ass->FlagAsModified(_("timing processor"));
+	grid->ass->Commit(_("timing processor"));
 	grid->CommitChanges();
 }

aegisub/src/dialog_translation.cpp

@@ -357,7 +357,7 @@ void DialogTranslation::OnTransBoxKey(wxKeyEvent &event) {
 		// Update line
 		cur->UpdateText();
 		cur->ClearBlocks();
-		subs->FlagAsModified(_("translation assistant"));
+		subs->Commit(_("translation assistant"));
 		grid->CommitChanges();
 		((FrameMain*)main)->UpdateTitle();
 		UpdatePreview();

aegisub/src/frame_main.cpp

@@ -570,6 +570,7 @@ void FrameMain::InitMenu() {
 
 /// @brief Initialize contents 
 void FrameMain::InitContents() {
+	AssFile::top = new AssFile;
 	// Set a background panel
 	StartupLog(_T("Create background panel"));
 	Panel = new wxPanel(this,-1,wxDefaultPosition,wxDefaultSize,wxTAB_TRAVERSAL | wxCLIP_CHILDREN);
@@ -590,8 +591,6 @@ void FrameMain::InitContents() {
 	StartupLog(_T("Create subtitles grid"));
 	SubsGrid = new SubtitlesGrid(this,Panel,-1,wxDefaultPosition,wxSize(600,100),wxWANTS_CHARS | wxSUNKEN_BORDER,_T("Subs grid"));
 	BottomSizer->Add(SubsGrid,1,wxEXPAND | wxLEFT | wxRIGHT | wxBOTTOM,0);
-	StartupLog(_T("Reset undo stack"));
-	AssFile::StackReset();
 	videoBox->videoSlider->grid = SubsGrid;
 	VideoContext::Get()->grid = SubsGrid;
 	StartupLog(_T("Reset video zoom"));
@@ -638,7 +637,6 @@ void FrameMain::DeInitContents() {
 	SubsGrid->ClearMaps();
 	delete EditBox;
 	delete videoBox;
-	AssFile::StackReset();
 	delete AssFile::top;
 	HelpButton::ClearPages();
 	VideoContext::Get()->audio = NULL;
@@ -708,7 +706,6 @@ void FrameMain::LoadSubtitles (wxString filename,wxString charset) {
 
 		// Proceed into loading
 		SubsGrid->ClearMaps();
-		AssFile::StackReset();
 		if (isFile) {
 			AssFile::top->Load(filename,charset);
 			SubsGrid->UpdateMaps();
@@ -1135,7 +1132,7 @@ void FrameMain::LoadVideo(wxString file,bool autoload) {
 					// Always change script res
 					SubsGrid->ass->SetScriptInfo(_T("PlayResX"), wxString::Format(_T("%d"), vidx));
 					SubsGrid->ass->SetScriptInfo(_T("PlayResY"), wxString::Format(_T("%d"), vidy));
-					SubsGrid->ass->FlagAsModified(_("Change script resolution"));
+					SubsGrid->ass->Commit(_("Change script resolution"));
 					SubsGrid->CommitChanges();
 					break;
 				case 0:
@@ -1350,8 +1347,8 @@ bool FrameMain::LoadList(wxArrayString list) {
 
 /// @brief Sets the descriptions for undo/redo 
 void FrameMain::SetUndoRedoDesc() {
-	editMenu->SetHelpString(0,_T("Undo ")+AssFile::GetUndoDescription());
+	editMenu->SetHelpString(0,_T("Undo ")+AssFile::top->GetUndoDescription());
-	editMenu->SetHelpString(1,_T("Redo ")+AssFile::GetRedoDescription());
+	editMenu->SetHelpString(1,_T("Redo ")+AssFile::top->GetRedoDescription());
 }
 
 /// @brief Check if ASSDraw is available 

aegisub/src/frame_main_events.cpp

@@ -435,16 +435,16 @@ void FrameMain::OnMenuOpen (wxMenuEvent &event) {
 	else if (curMenu == editMenu) {
 		// Undo state
 		wxMenuItem *item;
-		wxString undo_text = _("&Undo") + wxString(_T(" ")) + AssFile::GetUndoDescription() + wxString(_T("\t")) + Hotkeys.GetText(_T("Undo"));
+		wxString undo_text = _("&Undo") + wxString(_T(" ")) + AssFile::top->GetUndoDescription() + wxString(_T("\t")) + Hotkeys.GetText(_T("Undo"));
 		item = editMenu->FindItem(Menu_Edit_Undo);
 		item->SetItemLabel(undo_text);
-		item->Enable(!AssFile::IsUndoStackEmpty());
+		item->Enable(!AssFile::top->IsUndoStackEmpty());
 
 		// Redo state
-		wxString redo_text = _("&Redo") + wxString(_T(" ")) + AssFile::GetRedoDescription() + wxString(_T("\t")) + Hotkeys.GetText(_T("Redo"));
+		wxString redo_text = _("&Redo") + wxString(_T(" ")) + AssFile::top->GetRedoDescription() + wxString(_T("\t")) + Hotkeys.GetText(_T("Redo"));
 		item = editMenu->FindItem(Menu_Edit_Redo);
 		item->SetItemLabel(redo_text);
-		item->Enable(!AssFile::IsRedoStackEmpty());
+		item->Enable(!AssFile::top->IsRedoStackEmpty());
 
 		// Copy/cut/paste
 		wxArrayInt sels = SubsGrid->GetSelection();
@@ -1133,7 +1133,7 @@ void FrameMain::OnSnapToScene (wxCommandEvent &) {
 
 	// Commit
 	SubsGrid->editBox->Update(true);
-	SubsGrid->ass->FlagAsModified(_("snap to scene"));
+	SubsGrid->ass->Commit(_("snap to scene"));
 	SubsGrid->CommitChanges();
 }
 
@@ -1160,7 +1160,7 @@ void FrameMain::OnShiftToFrame (wxCommandEvent &) {
 	}
 
 	// Commit
-	SubsGrid->ass->FlagAsModified(_("shift to frame"));
+	SubsGrid->ass->Commit(_("shift to frame"));
 	SubsGrid->CommitChanges();
 	SubsGrid->editBox->Update(true,false);
 }
@@ -1168,17 +1168,17 @@ void FrameMain::OnShiftToFrame (wxCommandEvent &) {
 /// @brief Undo 
 void FrameMain::OnUndo(wxCommandEvent&) {
 	VideoContext::Get()->Stop();
-	AssFile::StackPop();
+	AssFile::top->Undo();
+	UpdateTitle();
 	SubsGrid->UpdateMaps();
-	AssFile::Popping = false;
 }
 
 /// @brief Redo 
 void FrameMain::OnRedo(wxCommandEvent&) {
 	VideoContext::Get()->Stop();
-	AssFile::StackRedo();
+	AssFile::top->Redo();
+	UpdateTitle();
 	SubsGrid->UpdateMaps();
-	AssFile::Popping = false;
 }
 
 /// @brief Find 
@@ -1347,21 +1347,21 @@ void FrameMain::OnSelect (wxCommandEvent &) {
 /// @brief Sort subtitles by start time
 void FrameMain::OnSortStart (wxCommandEvent &) {
 	AssFile::top->Sort();
-	AssFile::top->FlagAsModified(_("sort"));
+	AssFile::top->Commit(_("sort"));
 	SubsGrid->UpdateMaps();
 	SubsGrid->CommitChanges();
 }
 /// @brief Sort subtitles by end time
 void FrameMain::OnSortEnd (wxCommandEvent &) {
 	AssFile::top->Sort(AssFile::CompEnd);
-	AssFile::top->FlagAsModified(_("sort"));
+	AssFile::top->Commit(_("sort"));
 	SubsGrid->UpdateMaps();
 	SubsGrid->CommitChanges();
 }
 /// @brief Sort subtitles by style name
 void FrameMain::OnSortStyle (wxCommandEvent &) {
 	AssFile::top->Sort(AssFile::CompStyle);
-	AssFile::top->FlagAsModified(_("sort"));
+	AssFile::top->Commit(_("sort"));
 	SubsGrid->UpdateMaps();
 	SubsGrid->CommitChanges();
 }

aegisub/src/subs_edit_box.cpp

@@ -573,7 +573,7 @@ void SubsEditBox::OnStyleChange(wxCommandEvent &event) {
 			cur->Style = StyleBox->GetValue();
 		}
 	}
-	grid->ass->FlagAsModified(_("style change"));
+	grid->ass->Commit(_("style change"));
 	grid->CommitChanges();
 	grid->EndBatch();
 }
@@ -605,7 +605,7 @@ void SubsEditBox::OnActorChange(wxCommandEvent &event) {
 	}
 
 	// Update grid
-	grid->ass->FlagAsModified(_("actor change"));
+	grid->ass->Commit(_("actor change"));
 	grid->CommitChanges();
 	grid->EndBatch();
 }
@@ -633,7 +633,7 @@ void SubsEditBox::OnLayerChange(wxSpinEvent &event) {
 	}
 
 	// Done
-	grid->ass->FlagAsModified(_("layer change"));
+	grid->ass->Commit(_("layer change"));
 	grid->CommitChanges();
 }
 
@@ -660,7 +660,7 @@ void SubsEditBox::OnLayerEnter(wxCommandEvent &event) {
 	}
 
 	// Done
-	grid->ass->FlagAsModified(_("layer change"));
+	grid->ass->Commit(_("layer change"));
 	grid->CommitChanges();
 }
 
@@ -746,7 +746,7 @@ void SubsEditBox::CommitTimes(bool start,bool end,bool fromStart,bool commit) {
 		StartTime->Update();
 		EndTime->Update();
 		Duration->Update();
-		grid->ass->FlagAsModified(_("modify times"));
+		grid->ass->Commit(_("modify times"));
 		grid->CommitChanges();
 		int sel0 = grid->GetFirstSelRow();
 		audio->SetDialogue(grid,grid->GetDialogue(sel0),sel0);
@@ -772,7 +772,7 @@ void SubsEditBox::OnMarginLChange(wxCommandEvent &event) {
 		}
 	}
 	MarginL->SetValue(cur->GetMarginString(0,false));
-	grid->ass->FlagAsModified(_("MarginL change"));
+	grid->ass->Commit(_("MarginL change"));
 	grid->CommitChanges();
 	grid->EndBatch();
 }
@@ -795,7 +795,7 @@ void SubsEditBox::OnMarginRChange(wxCommandEvent &event) {
 		}
 	}
 	MarginR->SetValue(cur->GetMarginString(1,false));
-	grid->ass->FlagAsModified(_("MarginR change"));
+	grid->ass->Commit(_("MarginR change"));
 	grid->CommitChanges();
 	grid->EndBatch();
 }
@@ -819,7 +819,7 @@ void SubsEditBox::OnMarginVChange(wxCommandEvent &event) {
 		}
 	}
 	MarginV->SetValue(cur->GetMarginString(2,false));
-	grid->ass->FlagAsModified(_("MarginV change"));
+	grid->ass->Commit(_("MarginV change"));
 	grid->CommitChanges();
 	grid->EndBatch();
 }
@@ -841,7 +841,7 @@ void SubsEditBox::OnEffectChange(wxCommandEvent &event) {
 			cur->Effect = Effect->GetValue();
 		}
 	}
-	grid->ass->FlagAsModified(_("effect change"));
+	grid->ass->Commit(_("effect change"));
 	grid->CommitChanges();
 	grid->EndBatch();
 }
@@ -862,7 +862,7 @@ void SubsEditBox::OnCommentChange(wxCommandEvent &event) {
 			cur->Comment = CommentBox->GetValue();
 		}
 	}
-	grid->ass->FlagAsModified(_("comment change"));
+	grid->ass->Commit(_("comment change"));
 	grid->CommitChanges();
 	grid->EndBatch();
 }
@@ -945,7 +945,7 @@ void SubsEditBox::Commit(bool stay) {
 
 	// Update file
 	if (textNeedsCommit) {
-		grid->ass->FlagAsModified(_("editing"));
+		grid->ass->Commit(_("editing"));
 		grid->CommitChanges();
 	}
 	else if (StartTime->HasBeenModified() || EndTime->HasBeenModified()) {

aegisub/src/subs_grid.cpp

@@ -427,7 +427,7 @@ void SubtitlesGrid::OnSplitByKaraoke (wxCommandEvent &event) {
 		didSplit |= SplitLineByKaraoke(sels[i]);
 	}
 	if (didSplit) {
-		ass->FlagAsModified(_("splitting"));
+		ass->Commit(_("splitting"));
 		CommitChanges();
 	}
 	EndBatch();
@@ -692,7 +692,7 @@ void SubtitlesGrid::OnRecombine(wxCommandEvent &event) {
 		}
 
 		// Commit
-		ass->FlagAsModified(_("combining"));
+		ass->Commit(_("combining"));
 		CommitChanges();
 	}
 
@@ -848,7 +848,7 @@ void SubtitlesGrid::SwapLines(int n1,int n2) {
 	std::swap(*dlg1, *dlg2);
 	UpdateMaps();
 
-	ass->FlagAsModified(_("swap lines"));
+	ass->Commit(_("swap lines"));
 	CommitChanges();
 }
 
@@ -872,7 +872,7 @@ void SubtitlesGrid::InsertLine(AssDialogue *line,int n,bool after,bool update) {
 
 	// Update
 	if (update) {
-		ass->FlagAsModified(_("line insertion"));
+		ass->Commit(_("line insertion"));
 		CommitChanges();
 		AdjustScrollbar();
 	}
@@ -1005,7 +1005,7 @@ void SubtitlesGrid::PasteLines(int n,bool pasteOver) {
 			// Commit
 			UpdateMaps();
 			AdjustScrollbar();
-			ass->FlagAsModified(_("paste"));
+			ass->Commit(_("paste"));
 			CommitChanges();
 
 			// Set selection
@@ -1055,7 +1055,7 @@ void SubtitlesGrid::DeleteLines(wxArrayInt target, bool flagModified) {
 	UpdateMaps();
 	AdjustScrollbar();
 	if (flagModified) {
-		ass->FlagAsModified(_("delete"));
+		ass->Commit(_("delete"));
 		CommitChanges();
 	}
 
@@ -1118,7 +1118,7 @@ void SubtitlesGrid::JoinLines(int n1,int n2,bool concat) {
 	// Delete remaining lines (this will auto commit)
 	DeleteLines(GetRangeArray(n1+1,n2), false);
 
-	ass->FlagAsModified(_("join lines"));
+	ass->Commit(_("join lines"));
 	CommitChanges();
 
 	// Select new line
@@ -1160,7 +1160,7 @@ void SubtitlesGrid::AdjoinLines(int n1,int n2,bool setStart) {
 	}
 
 	// Commit
-	AssFile::top->FlagAsModified(_("adjoin"));
+	AssFile::top->Commit(_("adjoin"));
 	CommitChanges();
 }
 
@@ -1210,7 +1210,7 @@ void SubtitlesGrid::JoinAsKaraoke(int n1,int n2) {
 	// Delete remaining lines (this will auto commit)
 	DeleteLines(GetRangeArray(n1+1,n2), false);
 
-	ass->FlagAsModified(_("join as karaoke"));
+	ass->Commit(_("join as karaoke"));
 	CommitChanges();
 
 	// Select new line
@@ -1330,7 +1330,7 @@ void SubtitlesGrid::SplitLine(int n,int pos,int mode,wxString textIn) {
 	//editBox->SetToLine(n);
 
 	// Commit
-	ass->FlagAsModified(_("split"));
+	ass->Commit(_("split"));
 	CommitChanges();
 }
 
@@ -1439,7 +1439,7 @@ void SubtitlesGrid::SetSubsToVideo(bool start) {
 
 	// Commit
 	if (modified) {
-		ass->FlagAsModified(_("timing"));
+		ass->Commit(_("timing"));
 		CommitChanges();
 		editBox->Update(true);
 	}

aegisub/src/visual_tool.cpp

@@ -266,7 +266,7 @@ void VisualTool<FeatureType>::Commit(bool full, wxString message) {
 		if (message.empty()) {
 			message = _("visual typesetting");
 		}
-		grid->ass->FlagAsModified(message);
+		grid->ass->Commit(message);
 	}
 	grid->CommitChanges(false,!full);
 	if (full)