public void AutoTailWithFilter()
{
var scheduler = new TestScheduler();
var autoTailer = Observable.Return(new ScrollRequest(10));
Func<string, bool> predicate = s => s.Contains("odd");
using (var file = new TestFile())
{
file.Append(Enumerable.Range(1, 100).Select(i => i%2 == 1 ? $"{i} is an odd number" : $"{i} is an even number").ToArray());
var search = file.Info.Search(predicate, scheduler);
using (var tailer = new LineScroller(file.Info, search, autoTailer, new NullLogger(), scheduler))
{
//lines which contain "1"
var expectedLines = Enumerable.Range(1, 100)
.Select(i => i%2 == 1 ? $"{i} is an odd number" : $"{i} is an even number")
.Where(s => s.Contains("odd"))
.Reverse()
.Take(10)
.Reverse()
.ToArray();
scheduler.AdvanceBySeconds(1);
tailer.Lines.Items.Select(l => l.Text).ShouldAllBeEquivalentTo(expectedLines);
file.Append( Enumerable.Range(101, 10).Select(i => i%2 == 1 ? $"{i} is an odd number" : $"{i} is an even number").ToArray());
scheduler.AdvanceBySeconds(1);
expectedLines = Enumerable.Range(1, 110)
.Select(i => i%2 == 1 ? $"{i} is an odd number" : $"{i} is an even number")
.Where(s => s.Contains("odd"))
.Reverse()
.Take(10)
.Reverse()
.ToArray();
scheduler.AdvanceBySeconds(1);
tailer.Lines.Items.Select(l => l.Text).ShouldAllBeEquivalentTo(expectedLines);
}
}
}
public InlineViewer([NotNull] InlineViewerArgs args,
[NotNull] IClipboardHandler clipboardHandler,
[NotNull] ISchedulerProvider schedulerProvider,
[NotNull] ISelectionMonitor selectionMonitor,
[NotNull] ILogger logger,
[NotNull] IThemeProvider themeProvider)
{
if (args == null) throw new ArgumentNullException(nameof(args));
if (clipboardHandler == null) throw new ArgumentNullException(nameof(clipboardHandler));
if (schedulerProvider == null) throw new ArgumentNullException(nameof(schedulerProvider));
if (selectionMonitor == null) throw new ArgumentNullException(nameof(selectionMonitor));
if (themeProvider == null) throw new ArgumentNullException(nameof(themeProvider));
SelectionMonitor = selectionMonitor;
CopyToClipboardCommand = new Command(() => clipboardHandler.WriteToClipboard(selectionMonitor.GetSelectedText()));
_isSettingScrollPosition = false;
var lineProvider = args.LineProvider;
var selectedChanged = args.SelectedChanged;
var pageSize = this.WhenValueChanged(vm=>vm.PageSize);
//if use selection is null, tail the file
var scrollSelected = selectedChanged
.CombineLatest(lineProvider, pageSize, (proxy, lp, pge) => proxy == null ? new ScrollRequest(pge,0) : new ScrollRequest(pge, proxy.Start))
.DistinctUntilChanged();
var horizonalScrollArgs = new ReplaySubject<TextScrollInfo>(1);
HorizonalScrollChanged = hargs =>
{
horizonalScrollArgs.OnNext(hargs);
};
var scrollUser = _userScrollRequested
.Where(x => !_isSettingScrollPosition)
.Select(request => new ScrollRequest(ScrollReason.User, request.PageSize, request.FirstIndex));
var scroller = scrollSelected.Merge(scrollUser)
.ObserveOn(schedulerProvider.Background)
.DistinctUntilChanged();
var lineScroller = new LineScroller(lineProvider, scroller);
Count = lineProvider.Select(lp=>lp.Count).ForBinding();
MaximumChars = lineScroller.MaximumLines()
.ObserveOn(schedulerProvider.MainThread)
.ForBinding();
var proxyFactory = new LineProxyFactory(new TextFormatter(args.SearchMetadataCollection), new LineMatches(args.SearchMetadataCollection), horizonalScrollArgs.DistinctUntilChanged(), themeProvider);
//load lines into observable collection
var loader = lineScroller.Lines.Connect()
.Transform(proxyFactory.Create,new ParallelisationOptions(ParallelType.Ordered,3))
.Sort(SortExpressionComparer<LineProxy>.Ascending(proxy => proxy))
.ObserveOn(schedulerProvider.MainThread)
.Bind(out _data)
.DisposeMany()
.LogErrors(logger)
.Subscribe();
// track first visible index [required to set scroll extent]
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 =>
{
try
{
_isSettingScrollPosition = true;
FirstIndex = first;
}
finally
{
_isSettingScrollPosition = false;
}
});
_cleanUp = new CompositeDisposable(lineScroller,
loader,
Count,
firstIndexMonitor,
SelectionMonitor,
MaximumChars,
horizonalScrollArgs.SetAsComplete(),
_userScrollRequested.SetAsComplete());
}
public InlineViewer([NotNull] InlineViewerArgs args,
[NotNull] IClipboardHandler clipboardHandler,
[NotNull] ISchedulerProvider schedulerProvider,
[NotNull] ISelectionMonitor selectionMonitor)
{
if (args == null) throw new ArgumentNullException(nameof(args));
if (clipboardHandler == null) throw new ArgumentNullException(nameof(clipboardHandler));
if (schedulerProvider == null) throw new ArgumentNullException(nameof(schedulerProvider));
if (selectionMonitor == null) throw new ArgumentNullException(nameof(selectionMonitor));
SelectionMonitor = selectionMonitor;
CopyToClipboardCommand = new Command(() => clipboardHandler.WriteToClipboard(selectionMonitor.GetSelectedText()));
_isSettingScrollPosition = false;
var lineProvider = args.LineProvider;
var selectedChanged = args.SelectedChanged;
var pageSize = this.WhenValueChanged(vm=>vm.PageSize);
var scrollSelected = selectedChanged.Where(proxy => proxy != null)
.CombineLatest(lineProvider, pageSize,(proxy, lp,pge) => new ScrollRequest(pge, proxy.Start));
var scrollUser = _userScrollRequested
.Where(x=>!_isSettingScrollPosition)
.Select(request => new ScrollRequest(ScrollReason.User, request.PageSize, request.FirstIndex));
var scroller= scrollSelected.Merge(scrollUser)
.ObserveOn(schedulerProvider.Background)
.DistinctUntilChanged();
var lineScroller = new LineScroller(lineProvider, scroller);
Count = lineProvider.Select(lp=>lp.Count).ForBinding();
//load lines into observable collection
var loader = lineScroller.Lines.Connect()
.Transform(args.LineProxyFactory.Create)
.Sort(SortExpressionComparer<LineProxy>.Ascending(proxy => proxy))
.ObserveOn(schedulerProvider.MainThread)
.Bind(out _data)
.DisposeMany()
.Subscribe();
// track first visible index[required to set scroll extent]
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 =>
{
try
{
_isSettingScrollPosition = true;
FirstIndex = first;
}
finally
{
_isSettingScrollPosition = false;
}
});
_cleanUp = new CompositeDisposable(lineScroller,
loader,
Count,
firstIndexMonitor,
SelectionMonitor,
Disposable.Create(() =>
{
_userScrollRequested.OnCompleted();
}));
}
public TailViewModel([NotNull] ILogger logger,
[NotNull] ISchedulerProvider schedulerProvider,
[NotNull] IFileWatcher fileWatcher,
[NotNull] ISelectionMonitor selectionMonitor,
[NotNull] IClipboardHandler clipboardHandler,
[NotNull] ISearchInfoCollection searchInfoCollection,
[NotNull] IInlineViewerFactory inlineViewerFactory,
[NotNull] GeneralOptionBindings generalOptionBindings,
[NotNull] ICombinedSearchMetadataCollection combinedSearchMetadataCollection,
[NotNull] IStateBucketService stateBucketService,
[NotNull] ITailViewStateRestorer restorer,
[NotNull] SearchHints searchHints,
[NotNull] ITailViewStateControllerFactory tailViewStateControllerFactory,
[NotNull] IThemeProvider themeProvider,
[NotNull] SearchCollection searchCollection,
[NotNull] ITextFormatter textFormatter,
[NotNull] ILineMatches lineMatches,
[NotNull] IObjectProvider objectProvider,
[NotNull] IDialogCoordinator dialogCoordinator)
{
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 (stateBucketService == null) throw new ArgumentNullException(nameof(stateBucketService));
if (searchHints == null) throw new ArgumentNullException(nameof(searchHints));
if (themeProvider == null) throw new ArgumentNullException(nameof(themeProvider));
if (searchCollection == null) throw new ArgumentNullException(nameof(searchCollection));
if (textFormatter == null) throw new ArgumentNullException(nameof(textFormatter));
if (lineMatches == null) throw new ArgumentNullException(nameof(lineMatches));
if (objectProvider == null) throw new ArgumentNullException(nameof(objectProvider));
if (dialogCoordinator == null) throw new ArgumentNullException(nameof(dialogCoordinator));
if (combinedSearchMetadataCollection == null) throw new ArgumentNullException(nameof(combinedSearchMetadataCollection));
Name = fileWatcher.FullName;
SelectionMonitor = selectionMonitor;
GeneralOptionBindings = generalOptionBindings;
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; });
OpenSearchOptionsCommand = new Command(async () =>
{
await Task.Run(() =>
{
var content = objectProvider.Get<SearchOptionsViewModel>(new Argument<ICombinedSearchMetadataCollection>(combinedSearchMetadataCollection));
dialogCoordinator.Show(this, content, x => content.Dispose());
});
});
SearchCollection = searchCollection;
SearchMetadataCollection = combinedSearchMetadataCollection.Local;
var horizonalScrollArgs = new ReplaySubject<TextScrollInfo>(1);
HorizonalScrollChanged = args => horizonalScrollArgs.OnNext(args);
_tailViewStateControllerFactory = tailViewStateControllerFactory;
//this deals with state when loading the system at start up and at shut-down
_persister = new TailViewPersister(this, restorer);
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));
//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();
//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();
var lineProxyFactory = new LineProxyFactory(textFormatter, lineMatches, horizonalScrollArgs.DistinctUntilChanged(), themeProvider);
var loader = lineScroller.Lines.Connect()
.LogChanges(logger, "Received")
.Transform(lineProxyFactory.Create, new ParallelisationOptions(ParallelType.Ordered,5))
.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 : EmptyLineProvider.Instance);
InlineViewer = inlineViewerFactory. Create(combinedSearchMetadataCollection, inline, this.WhenValueChanged(vm => vm.SelectedItem));
_cleanUp = new CompositeDisposable(lineScroller,
loader,
firstIndexMonitor,
FileStatus,
Count,
LatestCount,
FileSizeText,
CanViewInline,
InlineViewer,
InlineViewerVisible,
SearchCollection,
searchInfoCollection,
searchHints,
combinedSearchMetadataCollection,
SelectionMonitor,
Disposable.Create(dialogCoordinator.Close),
searchInvoker,
MaximumChars,
_stateMonitor,
combinedSearchMetadataCollection,
horizonalScrollArgs.SetAsComplete(),
_userScrollRequested.SetAsComplete());
}
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] IRecentSearchCollection recentSearchCollection,
[NotNull] ISearchMetadataCollection searchMetadataCollection,
[NotNull] SearchOptionsViewModel searchOptionsViewModel,
[NotNull] SearchHints searchHints)
{
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));
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
AddSearchCommand = new Command(() =>
{
var text = SearchHints.SearchText;
searchInfoCollection.Add(text);
recentSearchCollection.Add(new RecentSearch(text));
SearchHints.SearchText = string.Empty;
},()=> SearchHints.SearchText.IsLongerThanOrEqualTo(3));
//User feedback to show file size
FileSizeText = fileWatcher.Latest.Select(fn=>fn.Size)
.Select(size => size.FormatWithAbbreviation())
.DistinctUntilChanged()
.ForBinding();
//User feedback to guide them whilst typing
SearchHint = SearchHints.WhenValueChanged(vm => vm.SearchText)
.Select(text =>
{
if (string.IsNullOrEmpty(text)) return "Type to search";
return text.Length < 3 ? "Enter at least 3 characters" : "Hit enter to search";
}).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));
var loader = lineScroller.Lines.Connect()
.Transform(x=>lineProxyFactory.Create(x), new ParallelisationOptions(ParallelType.Ordered,5))
.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,
SearchHint,
SelectedItemsCount,
CanViewInline,
InlineViewer,
InlineViewerVisible,
SearchCollection,
searchInfoCollection,
HighlightTail,
UsingDarkTheme,
searchHints,
searchMetadataCollection,
searchMetadataCollection,
SelectionMonitor,
SearchOptions,
Disposable.Create(_userScrollRequested.OnCompleted)
);
}
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] 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));
_stateProvider = new TailViewPersister(this);
Name = fileWatcher.FullName;
SelectionMonitor = selectionMonitor;
SearchOptions = searchOptionsViewModel;
SearchHints = searchHints;
CopyToClipboardCommand = new Command(()=> clipboardHandler.WriteToClipboard(selectionMonitor.GetSelectedText()));
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);
})
.Do(x=>logger.Info("Scrolling to {0}/{1}", x.FirstIndex,x.PageSize))
.DistinctUntilChanged();
//IsLoading = searchInfoCollection.All.Take(1).Select(_ => false).StartWith(true).ForBinding();
FileStatus = fileWatcher.Status.Throttle(TimeSpan.FromMilliseconds(250)).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()
.RecordChanges(logger, "Received")
.Transform(lineProxyFactory.Create, new ParallelisationOptions(ParallelType.Ordered, 3))
.Sort(SortExpressionComparer<LineProxy>.Ascending(proxy => proxy))
.ObserveOn(schedulerProvider.MainThread)
.Bind(out _data,100)
.DisposeMany()
.RecordErrors(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 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,
FileStatus,
Count,
LatestCount,
FileSizeText,
CanViewInline,
InlineViewer,
InlineViewerVisible,
SearchCollection,
searchInfoCollection,
HighlightTail,
UsingDarkTheme,
searchHints,
searchMetadataCollection,
searchMetadataCollection,
SelectionMonitor,
SearchOptions,
searchInvoker,
_userScrollRequested.SetAsComplete());
}