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 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] 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 (searchHints == null)
{
throw new ArgumentNullException(nameof(searchHints));
}
SelectionMonitor = selectionMonitor;
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();
//tailer is the main object used to tail, scroll and filter in a file
var lineScroller = new LineScroller(SearchCollection.Latest.ObserveOn(schedulerProvider.Background), scroller);
//Add a complete file display [No search info here]
var indexed = fileWatcher.Latest.Index()
.Replay(1).RefCount();
IsLoading = indexed.Take(1).Select(_ => false).StartWith(true).ForBinding();
searchInfoCollection.Add("<All>", indexed, SearchType.All);
//command to add the current search to the tail collection
KeepSearchCommand = new Command(() =>
{
var text = SearchHints.SearchText;
var latest = fileWatcher.Latest
.Search(s => s.Contains(text, StringComparison.OrdinalIgnoreCase))
.Replay(1).RefCount();
searchInfoCollection.Add(text, latest);
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 = this.WhenValueChanged(vm => vm.SearchHints.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();
//load lines into observable collection
var lineProxyFactory = new LineProxyFactory(new TextFormatter(searchInfoCollection));
var loader = lineScroller.Lines.Connect()
.Transform(lineProxyFactory.Create, 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 = indexed.Select(latest => latest.Count).ForBinding();
CountText = indexed.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)
.Select(selected => selected.IsUserDefined)
.DistinctUntilChanged();
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 = indexed.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,
Disposable.Create(() =>
{
_userScrollRequested.OnCompleted();
SelectionMonitor?.Dispose();
}));
}