public async Task WatchAsync(DotNetWatchContext context, CancellationToken cancellationToken)
{
var processSpec = context.ProcessSpec;
_reporter.Output("Hot reload enabled. For a list of supported edits, see https://aka.ms/dotnet/hot-reload. " +
"Press \"Ctrl + R\" to restart.");
var forceReload = new CancellationTokenSource();
_console.KeyPressed += (key) =>
{
var modifiers = ConsoleModifiers.Control;
if ((key.Modifiers & modifiers) == modifiers && key.Key == ConsoleKey.R)
{
var cancellationTokenSource = Interlocked.Exchange(ref forceReload, new CancellationTokenSource());
cancellationTokenSource.Cancel();
}
};
while (true)
{
context.Iteration++;
for (var i = 0; i < _filters.Length; i++)
{
await _filters[i].ProcessAsync(context, cancellationToken);
}
processSpec.EnvironmentVariables["DOTNET_WATCH_ITERATION"] = (context.Iteration + 1).ToString(CultureInfo.InvariantCulture);
var fileSet = context.FileSet;
if (fileSet == null)
{
_reporter.Error("Failed to find a list of files to watch");
return;
}
if (!fileSet.Project.IsNetCoreApp60OrNewer())
{
_reporter.Error($"Hot reload based watching is only supported in .NET 6.0 or newer apps. Update the project's launchSettings.json to disable this feature.");
return;
}
if (cancellationToken.IsCancellationRequested)
{
return;
}
if (context.Iteration == 0)
{
ConfigureExecutable(context, processSpec);
}
using var currentRunCancellationSource = new CancellationTokenSource();
using var combinedCancellationSource = CancellationTokenSource.CreateLinkedTokenSource(
cancellationToken,
currentRunCancellationSource.Token,
forceReload.Token);
using var fileSetWatcher = new HotReloadFileSetWatcher(fileSet, _reporter);
try
{
using var hotReload = new HotReload(_processRunner, _reporter);
await hotReload.InitializeAsync(context, cancellationToken);
var processTask = _processRunner.RunAsync(processSpec, combinedCancellationSource.Token);
var args = string.Join(" ", processSpec.Arguments);
_reporter.Verbose($"Running {processSpec.ShortDisplayName()} with the following arguments: {args}");
_reporter.Output("Started");
Task <FileItem[]> fileSetTask;
Task finishedTask;
while (true)
{
fileSetTask = fileSetWatcher.GetChangedFileAsync(combinedCancellationSource.Token);
finishedTask = await Task.WhenAny(processTask, fileSetTask).WaitAsync(combinedCancellationSource.Token);
if (finishedTask != fileSetTask || fileSetTask.Result is not FileItem[] fileItems)
{
// The app exited.
break;
}
else
{
if (MayRequireRecompilation(context, fileItems) is { } newFile)
{
_reporter.Output($"New file: {newFile.FilePath}. Rebuilding the application.");
break;
}
public async Task WatchAsync(DotNetWatchContext context, CancellationToken cancellationToken)
{
var processSpec = context.ProcessSpec;
var forceReload = new CancellationTokenSource();
var hotReloadEnabledMessage = "Hot reload enabled. For a list of supported edits, see https://aka.ms/dotnet/hot-reload.";
if (!_dotNetWatchOptions.NonInteractive)
{
_reporter.Output($"{hotReloadEnabledMessage}{Environment.NewLine} {(_dotNetWatchOptions.SuppressEmojis ? string.Empty : "💡")} Press \"Ctrl + R\" to restart.", emoji: "🔥");
_console.KeyPressed += (key) =>
{
var modifiers = ConsoleModifiers.Control;
if ((key.Modifiers & modifiers) == modifiers && key.Key == ConsoleKey.R)
{
var cancellationTokenSource = Interlocked.Exchange(ref forceReload, new CancellationTokenSource());
cancellationTokenSource.Cancel();
}
};
}
else
{
_reporter.Output(hotReloadEnabledMessage, emoji: "🔥");
}
while (true)
{
context.Iteration++;
for (var i = 0; i < _filters.Length; i++)
{
await _filters[i].ProcessAsync(context, cancellationToken);
}
processSpec.EnvironmentVariables["DOTNET_WATCH_ITERATION"] = (context.Iteration + 1).ToString(CultureInfo.InvariantCulture);
var fileSet = context.FileSet;
if (fileSet == null)
{
_reporter.Error("Failed to find a list of files to watch");
return;
}
if (!fileSet.Project.IsNetCoreApp60OrNewer())
{
_reporter.Error($"Hot reload based watching is only supported in .NET 6.0 or newer apps. Update the project's launchSettings.json to disable this feature.");
return;
}
if (cancellationToken.IsCancellationRequested)
{
return;
}
if (context.Iteration == 0)
{
ConfigureExecutable(context, processSpec);
}
using var currentRunCancellationSource = new CancellationTokenSource();
using var combinedCancellationSource = CancellationTokenSource.CreateLinkedTokenSource(
cancellationToken,
currentRunCancellationSource.Token,
forceReload.Token);
using var fileSetWatcher = new HotReloadFileSetWatcher(fileSet, _reporter);
try
{
using var hotReload = new HotReload(_processRunner, _reporter);
await hotReload.InitializeAsync(context, cancellationToken);
var processTask = _processRunner.RunAsync(processSpec, combinedCancellationSource.Token);
var args = string.Join(" ", processSpec.Arguments);
_reporter.Verbose($"Running {processSpec.ShortDisplayName()} with the following arguments: {args}");
_reporter.Output("Started", emoji: "🚀");
Task <FileItem[]?> fileSetTask;
Task finishedTask;
while (true)
{
fileSetTask = fileSetWatcher.GetChangedFileAsync(combinedCancellationSource.Token);
finishedTask = await Task.WhenAny(processTask, fileSetTask).WaitAsync(combinedCancellationSource.Token);
if (finishedTask != fileSetTask || fileSetTask.Result is not FileItem[] fileItems)
{
if (processTask.IsFaulted && finishedTask == processTask && !cancellationToken.IsCancellationRequested)
{
// Only show this error message if the process exited non-zero due to a normal process exit.
// Don't show this if dotnet-watch killed the inner process due to file change or CTRL+C by the user
_reporter.Error($"Application failed to start: {processTask.Exception?.InnerException?.Message}");
}
break;
}
else
{
if (MayRequireRecompilation(context, fileItems) is { } newFile)
{
_reporter.Output($"New file: {GetRelativeFilePath(newFile.FilePath)}. Rebuilding the application.");
break;
}
