private AddToHistoryOption GetAddToHistoryOption(string line)
{
// Whitespace only is useless, never add.
if (string.IsNullOrWhiteSpace(line))
{
return(AddToHistoryOption.SkipAdding);
}
// Under "no dupes" (which is on by default), immediately drop dupes of the previous line.
if (Options.HistoryNoDuplicates && _history.Count > 0 &&
string.Equals(_history[_history.Count - 1].CommandLine, line, StringComparison.Ordinal))
{
return(AddToHistoryOption.SkipAdding);
}
if (Options.AddToHistoryHandler != null)
{
if (Options.AddToHistoryHandler == PSConsoleReadLineOptions.DefaultAddToHistoryHandler)
{
// Avoid boxing if it's the default handler.
return(GetDefaultAddToHistoryOption(line));
}
object value = Options.AddToHistoryHandler(line);
if (value is PSObject psObj)
{
value = psObj.BaseObject;
}
if (value is bool boolValue)
{
return(boolValue ? AddToHistoryOption.MemoryAndFile : AddToHistoryOption.SkipAdding);
}
if (value is AddToHistoryOption enumValue)
{
return(enumValue);
}
if (value is string strValue && Enum.TryParse(strValue, out enumValue))
{
return(enumValue);
}
// 'TryConvertTo' incurs exception handling when the value cannot be converted to the target type.
// It's expensive, especially when we need to process lots of history items from file during the
// initialization. So do the conversion as the last resort.
if (LanguagePrimitives.TryConvertTo(value, out enumValue))
{
return(enumValue);
}
}
// Add to both history queue and file by default.
return(AddToHistoryOption.MemoryAndFile);
}
private string MaybeAddToHistory(string result, List <EditItem> edits, int undoEditIndex, bool readingHistoryFile, bool fromDifferentSession)
{
bool addToHistory = !string.IsNullOrWhiteSpace(result) && ((Options.AddToHistoryHandler == null) || Options.AddToHistoryHandler(result));
if (addToHistory)
{
_history.Enqueue(new HistoryItem
{
_line = result,
_edits = edits,
_undoEditIndex = undoEditIndex,
_saved = readingHistoryFile,
_fromDifferentLiveSession = fromDifferentSession,
});
_currentHistoryIndex = _history.Count;
if (_options.HistorySaveStyle == HistorySaveStyle.SaveIncrementally && !readingHistoryFile)
{
IncrementalHistoryWrite();
}
}
// Clear the saved line unless we used AcceptAndGetNext in which
// case we're really still in middle of history and might want
// to recall the saved line.
if (_getNextHistoryIndex == 0)
{
_savedCurrentLine._line = null;
_savedCurrentLine._edits = null;
_savedCurrentLine._undoEditIndex = 0;
}
return(result);
}
private string MaybeAddToHistory(
string result,
List <EditItem> edits,
int undoEditIndex,
bool fromDifferentSession = false,
bool fromInitialRead = false)
{
bool AddToHistory(string line)
{
// Whitespace only is useless, never add.
if (string.IsNullOrWhiteSpace(line))
{
return(false);
}
// If the user says don't add it, then don't.
if (Options.AddToHistoryHandler != null && !Options.AddToHistoryHandler(result))
{
return(false);
}
// Under "no dupes" (which is on by default), immediately drop dupes of the previous line.
if (Options.HistoryNoDuplicates && _history.Count > 0)
{
return(!string.Equals(_history[_history.Count - 1].CommandLine, result, StringComparison.Ordinal));
}
return(true);
}
if (AddToHistory(result))
{
var fromHistoryFile = fromDifferentSession || fromInitialRead;
_previousHistoryItem = new HistoryItem
{
CommandLine = result,
_edits = edits,
_undoEditIndex = undoEditIndex,
_saved = fromHistoryFile,
FromOtherSession = fromDifferentSession,
FromHistoryFile = fromInitialRead,
};
if (!fromHistoryFile)
{
_previousHistoryItem.StartTime = DateTime.UtcNow;
}
_history.Enqueue(_previousHistoryItem);
_currentHistoryIndex = _history.Count;
if (_options.HistorySaveStyle == HistorySaveStyle.SaveIncrementally && !fromHistoryFile)
{
IncrementalHistoryWrite();
}
}
else
{
_previousHistoryItem = null;
}
// Clear the saved line unless we used AcceptAndGetNext in which
// case we're really still in middle of history and might want
// to recall the saved line.
if (_getNextHistoryIndex == 0)
{
_savedCurrentLine.CommandLine = null;
_savedCurrentLine._edits = null;
_savedCurrentLine._undoEditIndex = 0;
}
return(result);
}
private string MaybeAddToHistory(string result, List <EditItem> edits, int undoEditIndex)
{
bool addToHistory = !string.IsNullOrWhiteSpace(result) && ((Options.AddToHistoryHandler == null) || Options.AddToHistoryHandler(result));
if (addToHistory && Options.HistoryNoDuplicates)
{
// REVIEW: should history be case sensitive - it is now.
// A smart comparer could use the ast to ignore case on commands, parameters,
// operators and keywords while remaining case sensitive on command arguments.
addToHistory = !_hashedHistory.Contains(result);
}
if (addToHistory)
{
_history.Enqueue(new HistoryItem
{
_line = result,
_edits = edits,
_undoEditIndex = undoEditIndex
});
_currentHistoryIndex = _history.Count;
}
if (_demoMode)
{
ClearDemoWindow();
}
_savedCurrentLine._line = null;
_savedCurrentLine._edits = null;
_savedCurrentLine._undoEditIndex = 0;
return(result);
}