public FileTailerViewModel([NotNull] ILogger logger,
[NotNull] ISchedulerProvider schedulerProvider,
[NotNull] IFileWatcher fileWatcher,
[NotNull] ISelectionMonitor selectionMonitor,
[NotNull] IClipboardHandler clipboardHandler,
[NotNull] ISearchInfoCollection searchInfoCollection,
[NotNull] IInlineViewerFactory inlineViewerFactory,
[NotNull] ISetting<GeneralOptions> generalOptions,
[NotNull] ISearchMetadataCollection searchMetadataCollection,
[NotNull] SearchOptionsViewModel searchOptionsViewModel,
[NotNull] SearchHints searchHints,
IObjectProvider objectProvider)
{
if (logger == null) throw new ArgumentNullException(nameof(logger));
if (schedulerProvider == null) throw new ArgumentNullException(nameof(schedulerProvider));
if (fileWatcher == null) throw new ArgumentNullException(nameof(fileWatcher));
if (selectionMonitor == null) throw new ArgumentNullException(nameof(selectionMonitor));
if (clipboardHandler == null) throw new ArgumentNullException(nameof(clipboardHandler));
if (searchInfoCollection == null) throw new ArgumentNullException(nameof(searchInfoCollection));
if (inlineViewerFactory == null) throw new ArgumentNullException(nameof(inlineViewerFactory));
if (generalOptions == null) throw new ArgumentNullException(nameof(generalOptions));
if (searchMetadataCollection == null) throw new ArgumentNullException(nameof(searchMetadataCollection));
if (searchOptionsViewModel == null) throw new ArgumentNullException(nameof(searchOptionsViewModel));
if (searchHints == null) throw new ArgumentNullException(nameof(searchHints));
_objectProvider = objectProvider;
SelectionMonitor = selectionMonitor;
SearchOptions = searchOptionsViewModel;
SearchHints = searchHints;
CopyToClipboardCommand = new Command(()=> clipboardHandler.WriteToClipboard(selectionMonitor.GetSelectedText()));
SelectedItemsCount = selectionMonitor.Selected.Connect().QueryWhenChanged(collection=> collection.Count).ForBinding();
SearchCollection = new SearchCollection(searchInfoCollection, schedulerProvider);
UsingDarkTheme = generalOptions.Value
.ObserveOn(schedulerProvider.MainThread)
.Select(options => options.Theme== Theme.Dark)
.ForBinding();
HighlightTail = generalOptions.Value
.ObserveOn(schedulerProvider.MainThread)
.Select(options => options.HighlightTail)
.ForBinding();
HighlightDuration = generalOptions.Value
.ObserveOn(schedulerProvider.MainThread)
.Select(options => new Duration(TimeSpan.FromSeconds(options.HighlightDuration)))
.ForBinding();
//An observable which acts as a scroll command
var autoChanged = this.WhenValueChanged(vm => vm.AutoTail);
var scroller = _userScrollRequested.CombineLatest(autoChanged, (user, auto) =>
{
var mode = AutoTail ? ScrollReason.Tail : ScrollReason.User;
return new ScrollRequest(mode, user.PageSize, user.FirstIndex);
})
.ObserveOn(schedulerProvider.Background)
.DistinctUntilChanged();
IsLoading = searchInfoCollection.All.Take(1).Select(_ => false).StartWith(true).ForBinding();
//command to add the current search to the tail collection
var searchInvoker = SearchHints.SearchRequested.Subscribe(request =>
{
searchInfoCollection.Add(request.Text, request.UseRegEx);
});
//User feedback to show file size
FileSizeText = fileWatcher.Latest.Select(fn=>fn.Size)
.Select(size => size.FormatWithAbbreviation())
.DistinctUntilChanged()
.ForBinding();
//tailer is the main object used to tail, scroll and filter in a file
var lineScroller = new LineScroller(SearchCollection.Latest.ObserveOn(schedulerProvider.Background), scroller);
//load lines into observable collection
var lineProxyFactory = new LineProxyFactory(new TextFormatter(searchMetadataCollection),new LineMatches(searchMetadataCollection));
var loader = lineScroller.Lines.Connect()
.Transform(x=>lineProxyFactory.Create(x), new ParallelisationOptions(ParallelType.Ordered,3))
.Sort(SortExpressionComparer<LineProxy>.Ascending(proxy => proxy))
.ObserveOn(schedulerProvider.MainThread)
.Bind(out _data)
.DisposeMany()
.Subscribe(changes => logger.Info($"Rows changed. {changes.Adds} adds, {changes.Removes} removed"),
ex => logger.Error(ex, "There is a problem with bind data"));
//monitor matching lines and start index,
Count = searchInfoCollection.All.Select(latest=>latest.Count).ForBinding();
CountText = searchInfoCollection.All.Select(latest => $"{latest.Count.ToString("##,###")} lines").ForBinding();
LatestCount = SearchCollection.Latest.Select(latest => latest.Count).ForBinding();
//track first visible index
var firstIndexMonitor = lineScroller.Lines.Connect()
.Buffer(TimeSpan.FromMilliseconds(250)).FlattenBufferResult()
.ToCollection()
.Select(lines => lines.Count == 0 ? 0 : lines.Select(l => l.Index).Max() - lines.Count+1)
.ObserveOn(schedulerProvider.MainThread)
.Subscribe(first =>
{
FirstIndex = first;
});
//Create objects required for inline viewing
var isUserDefinedChanged = SearchCollection.WhenValueChanged(sc => sc.Selected)
.Where(selected=> selected!=null)
.Select(selected => selected.IsUserDefined)
.DistinctUntilChanged()
.Replay(1)
.RefCount();
var inlineViewerVisible = isUserDefinedChanged.CombineLatest(this.WhenValueChanged(vm => vm.ShowInline),
(userDefined, showInline) => userDefined && showInline);
CanViewInline = isUserDefinedChanged.ForBinding();
InlineViewerVisible = inlineViewerVisible.ForBinding();
//return an empty line provider unless user is viewing inline - this saves needless trips to the file
var inline = searchInfoCollection.All.CombineLatest(inlineViewerVisible, (index, ud) => ud ? index : new EmptyLineProvider());
InlineViewer = inlineViewerFactory.Create(inline, this.WhenValueChanged(vm => vm.SelectedItem),lineProxyFactory);
_cleanUp = new CompositeDisposable(lineScroller,
loader,
firstIndexMonitor,
IsLoading,
Count,
LatestCount,
FileSizeText,
SelectedItemsCount,
CanViewInline,
InlineViewer,
InlineViewerVisible,
SearchCollection,
searchInfoCollection,
HighlightTail,
UsingDarkTheme,
searchHints,
searchMetadataCollection,
searchMetadataCollection,
SelectionMonitor,
SearchOptions,
searchInvoker,
_userScrollRequested.SetAsComplete());
}
public TailViewModel([NotNull] ILogger logger,
[NotNull] ISchedulerProvider schedulerProvider,
[NotNull] IFileWatcher fileWatcher,
[NotNull] ISelectionMonitor selectionMonitor,
[NotNull] IClipboardHandler clipboardHandler,
[NotNull] ISearchInfoCollection searchInfoCollection,
[NotNull] IInlineViewerFactory inlineViewerFactory,
[NotNull] ISetting<GeneralOptions> generalOptions,
[NotNull] ISearchMetadataCollection searchMetadataCollection,
[NotNull] IStateBucketService stateBucketService,
[NotNull] SearchOptionsViewModel searchOptionsViewModel,
[NotNull] ITailViewStateRestorer restorer,
[NotNull] SearchHints searchHints,
[NotNull] ITailViewStateControllerFactory tailViewStateControllerFactory,
[NotNull] IThemeProvider themeProvider)
{
if (logger == null) throw new ArgumentNullException(nameof(logger));
if (schedulerProvider == null) throw new ArgumentNullException(nameof(schedulerProvider));
if (fileWatcher == null) throw new ArgumentNullException(nameof(fileWatcher));
if (selectionMonitor == null) throw new ArgumentNullException(nameof(selectionMonitor));
if (clipboardHandler == null) throw new ArgumentNullException(nameof(clipboardHandler));
if (searchInfoCollection == null) throw new ArgumentNullException(nameof(searchInfoCollection));
if (inlineViewerFactory == null) throw new ArgumentNullException(nameof(inlineViewerFactory));
if (generalOptions == null) throw new ArgumentNullException(nameof(generalOptions));
if (searchMetadataCollection == null) throw new ArgumentNullException(nameof(searchMetadataCollection));
if (stateBucketService == null) throw new ArgumentNullException(nameof(stateBucketService));
if (searchOptionsViewModel == null) throw new ArgumentNullException(nameof(searchOptionsViewModel));
if (searchHints == null) throw new ArgumentNullException(nameof(searchHints));
if (themeProvider == null) throw new ArgumentNullException(nameof(themeProvider));
Name = fileWatcher.FullName;
SelectionMonitor = selectionMonitor;
SearchOptions = searchOptionsViewModel;
SearchHints = searchHints;
CopyToClipboardCommand = new Command(() => clipboardHandler.WriteToClipboard(selectionMonitor.GetSelectedText()));
OpenFileCommand = new Command(() => Process.Start(fileWatcher.FullName));
OpenFolderCommand = new Command(() => Process.Start(fileWatcher.Folder));
CopyPathToClipboardCommand = new Command(() => clipboardHandler.WriteToClipboard(fileWatcher.FullName));
UnClearCommand = new Command(fileWatcher.Reset);
ClearCommand = new Command(fileWatcher.Clear);
KeyAutoTail = new Command(() => { AutoTail = true; });
SearchCollection = new SearchCollection(searchInfoCollection, schedulerProvider);
SearchMetadataCollection = searchMetadataCollection;
var horizonalScrollArgs = new ReplaySubject<TextScrollInfo>(1);
HorizonalScrollChanged = args => horizonalScrollArgs.OnNext(args);
_tailViewStateControllerFactory = tailViewStateControllerFactory;
//Move these 2 highlight fields to a service as all views require them
UsingDarkTheme = generalOptions.Value
.ObserveOn(schedulerProvider.MainThread)
.Select(options => options.Theme== Theme.Dark)
.ForBinding();
HighlightTail = generalOptions.Value
.ObserveOn(schedulerProvider.MainThread)
.Select(options => options.HighlightTail)
.ForBinding();
//this deals with state when loading the system at start up and at shut-down
_persister = new TailViewPersister(this, restorer);
//An observable which acts as a scroll command
var autoChanged = this.WhenValueChanged(vm => vm.AutoTail);
var scroller = _userScrollRequested.CombineLatest(autoChanged, (user, auto) =>
{
var mode = AutoTail ? ScrollReason.Tail : ScrollReason.User;
return new ScrollRequest(mode, user.PageSize, user.FirstIndex);
})
.Do(x=>logger.Info("Scrolling to {0}/{1}", x.FirstIndex,x.PageSize))
.DistinctUntilChanged();
FileStatus = fileWatcher.Status.ForBinding();
//command to add the current search to the tail collection
var searchInvoker = SearchHints.SearchRequested.Subscribe(request => searchInfoCollection.Add(request.Text, request.UseRegEx));
//User feedback to show file size
FileSizeText = fileWatcher.Latest.Select(fn=>fn.Size)
.Select(size => size.FormatWithAbbreviation())
.DistinctUntilChanged()
.ForBinding();
//tailer is the main object used to tail, scroll and filter in a file
var selectedProvider = SearchCollection.Latest.ObserveOn(schedulerProvider.Background);
var lineScroller = new LineScroller(selectedProvider, scroller);
MaximumChars = lineScroller.MaximumLines()
.ObserveOn(schedulerProvider.MainThread)
.ForBinding();
//load lines into observable collection
var lineProxyFactory = new LineProxyFactory(new TextFormatter(searchMetadataCollection), new LineMatches(searchMetadataCollection), horizonalScrollArgs.DistinctUntilChanged(), themeProvider);
var loader = lineScroller.Lines.Connect()
.LogChanges(logger, "Received")
.Transform(lineProxyFactory.Create, new ParallelisationOptions(ParallelType.Ordered, 3))
.LogChanges(logger, "Sorting")
.Sort(SortExpressionComparer<LineProxy>.Ascending(proxy => proxy))
.ObserveOn(schedulerProvider.MainThread)
.Bind(out _data,100)
.LogChanges(logger, "Bound")
.DisposeMany()
.LogErrors(logger)
.Subscribe();
//monitor matching lines and start index,
Count = searchInfoCollection.All.Select(latest=>latest.Count).ForBinding();
CountText = searchInfoCollection.All.Select(latest => $"{latest.Count.ToString("##,###")} lines").ForBinding();
LatestCount = SearchCollection.Latest.Select(latest => latest.Count).ForBinding();
////track first visible index
var firstIndexMonitor = lineScroller.Lines.Connect()
.Buffer(TimeSpan.FromMilliseconds(25)).FlattenBufferResult()
.ToCollection()
.Select(lines => lines.Count == 0 ? 0 : lines.Select(l => l.Index).Max() - lines.Count + 1)
.ObserveOn(schedulerProvider.MainThread)
.Subscribe(first =>
{
FirstIndex = first;
});
//Create objects required for inline viewing
var isUserDefinedChanged = SearchCollection.WhenValueChanged(sc => sc.Selected)
.Where(selected=> selected!=null)
.Select(selected => selected.IsUserDefined)
.DistinctUntilChanged()
.Replay(1)
.RefCount();
var showInline = this.WhenValueChanged(vm => vm.ShowInline);
var inlineViewerVisible = isUserDefinedChanged.CombineLatest(showInline, (userDefined, showInlne) => userDefined && showInlne);
CanViewInline = isUserDefinedChanged.ForBinding();
InlineViewerVisible = inlineViewerVisible.ForBinding();
//return an empty line provider unless user is viewing inline - this saves needless trips to the file
var inline = searchInfoCollection.All.CombineLatest(inlineViewerVisible, (index, ud) => ud ? index : new EmptyLineProvider());
InlineViewer = inlineViewerFactory.Create(inline, this.WhenValueChanged(vm => vm.SelectedItem), searchMetadataCollection);
_cleanUp = new CompositeDisposable(lineScroller,
loader,
firstIndexMonitor,
FileStatus,
Count,
LatestCount,
FileSizeText,
CanViewInline,
InlineViewer,
InlineViewerVisible,
SearchCollection,
searchInfoCollection,
HighlightTail,
UsingDarkTheme,
searchHints,
searchMetadataCollection,
SelectionMonitor,
SearchOptions,
searchInvoker,
MaximumChars,
_stateMonitor,
horizonalScrollArgs.SetAsComplete(),
_userScrollRequested.SetAsComplete());
}