Prefs.cpp

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  Prefs.cpp
 
  Dominic Mazzoni
 
*******************************************************************//*******************************************************************/
 
 
#include "Prefs.h"
 
#include <wx/defs.h>
#include <wx/app.h>
#include <wx/filename.h>
#include <wx/stdpaths.h>
 
#include "Internat.h"
#include "MemoryX.h"
#include "BasicUI.h"
#include "Observer.h"
 
BoolSetting DefaultUpdatesCheckingFlag{
    L"/Update/DefaultUpdatesChecking", true };
 
std::unique_ptr<FileConfig> ugPrefs {};
 
FileConfig *gPrefs = nullptr;
int gMenusDirty = 0;
 
struct PrefsListener::Impl
{
   Impl( PrefsListener &owner );
   ~Impl();
   void OnEvent(int id);
   PrefsListener &mOwner;
   Observer::Subscription mSubscription;
};
 
namespace {
 
struct Hub : Observer::Publisher<int>
{
   using Publisher::Publish;
};
 
static Hub &hub()
{
   static Hub theHub;
   return theHub;
}
 
}
 
void PrefsListener::Broadcast(int id)
{
   BasicUI::CallAfter([id]{
      hub().Publish(id);
   });
}
 
PrefsListener::Impl::Impl( PrefsListener &owner )
   : mOwner{ owner }
{
   mSubscription = hub().Subscribe(*this, &Impl::OnEvent);
}
 
PrefsListener::Impl::~Impl()
{
}
 
PrefsListener::PrefsListener()
   : mpImpl{ std::make_unique<Impl>( *this ) }
{
}
 
PrefsListener::~PrefsListener()
{
}
 
void PrefsListener::UpdatePrefs()
{
}
 
void PrefsListener::UpdateSelectedPrefs( int )
{
}
 
void PrefsListener::Impl::OnEvent( int id )
{
   if (id <= 0)
      mOwner.UpdatePrefs();
   else
      mOwner.UpdateSelectedPrefs( id );
}
 
#if 0
// Copy one entry from one wxConfig object to another
static void CopyEntry(wxString path, wxConfigBase *src, wxConfigBase *dst, wxString entry)
{
   switch(src->GetEntryType(entry)) {
   case wxConfigBase::Type_Unknown:
   case wxConfigBase::Type_String: {
      wxString value = src->Read(entry, wxT(""));
      dst->Write(path + entry, value);
      break;
   }
   case wxConfigBase::Type_Boolean: {
      bool value = false;
      src->Read(entry, &value, value);
      dst->Write(path + entry, value);
      break;
   }
   case wxConfigBase::Type_Integer: {
      long value = false;
      src->Read(entry, &value, value);
      dst->Write(path + entry, value);
      break;
   }
   case wxConfigBase::Type_Float: {
      double value = false;
      src->Read(entry, &value, value);
      dst->Write(path + entry, value);
      break;
   }
   }
}
 
 
// Recursive routine to copy all groups and entries from one wxConfig object to another
static void CopyEntriesRecursive(wxString path, wxConfigBase *src, wxConfigBase *dst)
{
   wxString entryName;
   long entryIndex;
   bool entryKeepGoing;
 
   entryKeepGoing = src->GetFirstEntry(entryName, entryIndex);
   while (entryKeepGoing) {
      CopyEntry(path, src, dst, entryName);
      entryKeepGoing = src->GetNextEntry(entryName, entryIndex);
   }
 
   wxString groupName;
   long groupIndex;
   bool groupKeepGoing;
 
   groupKeepGoing = src->GetFirstGroup(groupName, groupIndex);
   while (groupKeepGoing) {
      wxString subPath = path+groupName+wxT("/");
      src->SetPath(subPath);
      CopyEntriesRecursive(subPath, src, dst);
      src->SetPath(path);
      groupKeepGoing = src->GetNextGroup(groupName, groupIndex);
   }
}
#endif
 
void InitPreferences( std::unique_ptr<FileConfig> uPrefs )
{
   gPrefs = uPrefs.get();
   ugPrefs = std::move(uPrefs);
   wxConfigBase::Set(gPrefs);
   PrefsListener::Broadcast();
}
 
void ResetPreferences()
{
   // Future:  make this a static registry table, so the settings objects
   // don't need to be defined in this source code file to avoid dependency
   // cycles
   std::pair<BoolSetting &, bool> stickyBoolSettings[] {
      {DefaultUpdatesCheckingFlag, 0},
      // ... others?
   };
   for (auto &pair : stickyBoolSettings)
      pair.second = pair.first.Read();
 
   bool savedValue = DefaultUpdatesCheckingFlag.Read();
   gPrefs->DeleteAll();
 
   for (auto &pair : stickyBoolSettings)
      pair.first.Write(pair.second);
}
 
void FinishPreferences()
{
   if (gPrefs) {
      wxConfigBase::Set(NULL);
      ugPrefs.reset();
      gPrefs = NULL;
   }
}
 
namespace
{
std::vector<SettingScope*> sScopes;
}
 
SettingScope::SettingScope()
{
   sScopes.push_back(this);
}
 
SettingScope::~SettingScope() noexcept
{
   // Settings can be scoped only on stack
   // so it should be safe to assume that sScopes.top() == this;
   assert(!sScopes.empty() && sScopes.back() == this);
 
   if (sScopes.empty() || sScopes.back() != this)
      return;
 
   if (!mCommitted)
      for (auto pSetting : mPending)
         pSetting->Rollback();
 
   sScopes.pop_back();
}
 
// static
auto SettingScope::Add( TransactionalSettingBase &setting ) -> AddResult
{
   if ( sScopes.empty() || sScopes.back()->mCommitted )
      return NotAdded;
 
   const bool inserted = sScopes.back()->mPending.insert(&setting).second;
 
   if (inserted)
   {
      setting.EnterTransaction(sScopes.size());
 
      // We need to introduce this setting into all
      // previous scopes that do not yet contain it.
      for (auto it = sScopes.rbegin() + 1; it != sScopes.rend(); ++it)
      {
         if ((*it)->mPending.find(&setting) != (*it)->mPending.end())
            break;
         
         (*it)->mPending.insert(&setting);
      }
   }
   
   return inserted ? Added : PreviouslyAdded;
}
 
bool SettingTransaction::Commit()
{
   if (sScopes.empty() || sScopes.back() != this)
      return false;
   
   if ( !mCommitted ) {
      for ( auto pSetting : mPending )
         if ( !pSetting->Commit() )
            return false;
      
      if (sScopes.size() > 1 || gPrefs->Flush())
      {
         mPending.clear();
         mCommitted = true;
         return true;
      }
   }
   
   return false;
}
 
EnumValueSymbols::EnumValueSymbols(
   ByColumns_t,
   const TranslatableStrings &msgids,
   wxArrayStringEx internals
)
   : mInternals( std::move( internals ) )
{
   auto size = mInternals.size(), size2 = msgids.size();
   if ( size != size2 ) {
      wxASSERT( false );
      size = std::min( size, size2 );
   }
   reserve( size );
   auto iter1 = mInternals.begin();
   auto iter2 = msgids.begin();
   while( size-- )
      emplace_back( *iter1++, *iter2++ );
}
 
const TranslatableStrings &EnumValueSymbols::GetMsgids() const
{
   if ( mMsgids.empty() )
      mMsgids = transform_container<TranslatableStrings>( *this,
         std::mem_fn( &EnumValueSymbol::Msgid ) );
   return mMsgids;
}
 
const wxArrayStringEx &EnumValueSymbols::GetInternals() const
{
   if ( mInternals.empty() )
      mInternals = transform_container<wxArrayStringEx>( *this,
         std::mem_fn( &EnumValueSymbol::Internal ) );
   return mInternals;
}
 
const EnumValueSymbol &ChoiceSetting::Default() const
{
   if ( mDefaultSymbol >= 0 && mDefaultSymbol < (long)mSymbols.size() )
      return mSymbols[ mDefaultSymbol ];
   static EnumValueSymbol empty;
   return empty;
}
 
wxString ChoiceSetting::Read() const
{
   const auto &defaultValue = Default().Internal();
   return ReadWithDefault( defaultValue );
}
 
wxString ChoiceSetting::ReadWithDefault( const wxString &defaultValue ) const
{
   wxString value;
   if ( !gPrefs->Read(mKey, &value, defaultValue) )
      if (!mMigrated) {
         const_cast<ChoiceSetting*>(this)->Migrate( value );
         mMigrated = true;
      }
 
   // Remap to default if the string is not known -- this avoids surprises
   // in case we try to interpret config files from future versions
   auto index = Find( value );
   if ( index >= mSymbols.size() )
      value = defaultValue;
   return value;
}
 
size_t ChoiceSetting::Find( const wxString &value ) const
{
   auto start = GetSymbols().begin();
   return size_t(
      std::find( start, GetSymbols().end(), EnumValueSymbol{ value, {} } )
         - start );
}
 
void ChoiceSetting::Migrate( wxString &value )
{
   (void)value;// Compiler food
}
 
bool ChoiceSetting::Write( const wxString &value )
{
   auto index = Find( value );
   if (index >= mSymbols.size())
      return false;
 
   auto result = gPrefs->Write( mKey, value );
   mMigrated = true;
 
   if (mpOtherSettings)
      mpOtherSettings->Invalidate();
 
   return result;
}
 
void ChoiceSetting::SetDefault( long value )
{
   mDefaultSymbol = value;
}
 
int EnumSettingBase::ReadInt() const
{
   auto index = Find( Read() );
 
   wxASSERT( index < mIntValues.size() );
   return mIntValues[ index ];
}
 
int EnumSettingBase::ReadIntWithDefault( int defaultValue ) const
{
   wxString defaultString;
   auto index0 = FindInt( defaultValue );
   if ( index0 < mSymbols.size() )
      defaultString = mSymbols[ index0 ].Internal();
   else
      wxASSERT( false );
 
   auto index = Find( ReadWithDefault( defaultString ) );
 
   wxASSERT( index < mSymbols.size() );
   return mIntValues[ index ];
}
 
size_t EnumSettingBase::FindInt( int code ) const
{
   const auto start = mIntValues.begin();
   return size_t(
      std::find( start, mIntValues.end(), code )
         - start );
}
 
void EnumSettingBase::Migrate( wxString &value )
{
   int intValue = 0;
   if ( !mOldKey.empty() &&
        gPrefs->Read(mOldKey, &intValue, 0) ) {
      // Make the migration, only once and persistently.
      // Do not DELETE the old key -- let that be read if user downgrades
      // Audacity.  But further changes will be stored only to the NEW key
      // and won't be seen then.
      auto index = (long) FindInt( intValue );
      if ( index >= (long)mSymbols.size() )
         index = mDefaultSymbol;
      if ( index >= 0 && index < (long)mSymbols.size() ) {
         value = mSymbols[index].Internal();
         Write(value);
         gPrefs->Flush();
      }
   }
}
 
bool EnumSettingBase::WriteInt( int code ) // you flush gPrefs afterward
{
   auto index = FindInt( code );
   if ( index >= mSymbols.size() )
      return false;
   return Write( mSymbols[index].Internal() );
}
 
wxString WarningDialogKey(const wxString &internalDialogName)
{
   return wxT("/Warnings/") + internalDialogName;
}
 
ByColumns_t ByColumns{};
 
#include <set>
 
namespace {
   using PreferenceInitializers = std::set< PreferenceInitializer* >;
   PreferenceInitializers &allInitializers()
   {
      static PreferenceInitializers theSet;
      return theSet;
   }
}
 
PreferenceInitializer::PreferenceInitializer()
{
   allInitializers().insert( this );
}
 
PreferenceInitializer::~PreferenceInitializer()
{
   allInitializers().erase( this );
}
 
void PreferenceInitializer::ReinitializeAll()
{
   for ( auto pInitializer : allInitializers() )
      (*pInitializer)();
}
 
wxConfigBase *SettingBase::GetConfig() const
{
   return gPrefs;
}
 
bool SettingBase::Delete()
{
   auto config = GetConfig();
   return config && config->DeleteEntry( GetPath() );
}
 
bool BoolSetting::Toggle()
{
   bool value = Read();
   if ( Write( !value ) )
      return !value;
   else
      return value;
}