Add --no-watch flag to disable config file auto-restart (#1554)

* Initial plan

* Add --no-watch flag to disable config file auto-restart

Co-authored-by: waldekmastykarz <11164679+waldekmastykarz@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: waldekmastykarz <11164679+waldekmastykarz@users.noreply.github.com>
Co-authored-by: Waldek Mastykarz <waldek@mastykarz.nl>
Co-authored-by: Garry Trinder <garry@trinder365.co.uk>

Author: 3 people

DevProxy.Abstractions/Proxy/IProxyConfiguration.cs

@@ -41,6 +41,7 @@ public interface IProxyConfiguration
     LogLevel LogLevel { get; }
     ReleaseType NewVersionNotification { get; }
     bool NoFirstRun { get; set; }
+    bool NoWatch { get; set; }
     int Port { get; set; }
     bool Record { get; set; }
     bool ShowTimestamps { get; }

DevProxy/Commands/DevProxyCommand.cs

@@ -33,6 +33,7 @@ sealed class DevProxyCommand : RootCommand
         Description = "The path to the configuration file"
     };
     internal const string NoFirstRunOptionName = "--no-first-run";
+    internal const string NoWatchOptionName = "--no-watch";
     internal const string AsSystemProxyOptionName = "--as-system-proxy";
     internal const string InstallCertOptionName = "--install-cert";
     internal const string UrlsToWatchOptionName = "--urls-to-watch";
@@ -402,6 +403,11 @@ private void ConfigureCommand()
             Description = "Skip the first run experience"
         };
 
+        var noWatchOption = new Option<bool?>(NoWatchOptionName)
+        {
+            Description = "Disable automatic restart on configuration file changes"
+        };
+
         var discoverOption = new Option<bool?>(DiscoverOptionName)
         {
             Description = "Run Dev Proxy in discovery mode"
@@ -529,6 +535,7 @@ private void ConfigureCommand()
             ipAddressOption,
             logLevelOption,
             noFirstRunOption,
+            noWatchOption,
             outputOption,
             portOption,
             recordOption,
@@ -613,6 +620,11 @@ private void ConfigureFromOptions(ParseResult parseResult)
         {
             _proxyConfiguration.NoFirstRun = noFirstRun.Value;
         }
+        var noWatch = parseResult.GetValueOrDefault<bool?>(NoWatchOptionName);
+        if (noWatch is not null)
+        {
+            _proxyConfiguration.NoWatch = noWatch.Value;
+        }
         var asSystemProxy = parseResult.GetValueOrDefault<bool?>(AsSystemProxyOptionName);
         if (asSystemProxy is not null)
         {

DevProxy/Proxy/ConfigFileWatcher.cs

@@ -44,6 +44,12 @@ public static void Reset()
 
     public Task StartAsync(CancellationToken cancellationToken)
     {
+        if (_proxyConfiguration.NoWatch)
+        {
+            _logger.LogDebug("Configuration file watching is disabled");
+            return Task.CompletedTask;
+        }
+
         var configFilePath = _proxyConfiguration.ConfigFile;
         if (string.IsNullOrEmpty(configFilePath) || !File.Exists(configFilePath))
         {

DevProxy/Proxy/ProxyConfiguration.cs

@@ -38,6 +38,7 @@ public string ConfigFile
     [JsonConverter(typeof(JsonStringEnumConverter))]
     public LogLevel LogLevel { get; set; } = LogLevel.Information;
     public bool NoFirstRun { get; set; }
+    public bool NoWatch { get; set; }
     [JsonConverter(typeof(JsonStringEnumConverter))]
     public ReleaseType NewVersionNotification { get; set; } = ReleaseType.Stable;
     public int Port { get; set; } = 8000;