(chocolatey#2200) upgrade exit 2 if nothing to do

If enhanced exit codes are enabled, this sets the upgrade command to
exit with 2 if there is nothing to do (i.e. if no packages are
upgraded). This entails returning the number of successful package
results from the report_action_summary method.

src/chocolatey/infrastructure.app/commands/ChocolateyUpgradeCommand.cs

@@ -351,6 +351,11 @@ Exit codes that normally result from running this command.
 Normal:
  - 0: operation was successful, no issues detected
  - -1 or 1: an error has occurred
+ - 2: nothing to do, no packages outdated (enhanced)
+
+NOTE: Starting in v2.3.0, if you have the feature '{2}'
+ turned on, then choco will provide enhanced exit codes that allow
+ better integration and scripting.
 
 Package Exit Codes:
  - 1641: success, reboot initiated
@@ -368,7 +373,7 @@ turned on.  Uninstall command has additional valid exit codes.
 In addition to the above exit codes, you may also see reboot exit codes
  when the feature '{1}' is turned on. It typically requires
  the feature '{0}' to also be turned on to work properly.
-".FormatWith(ApplicationParameters.Features.UsePackageExitCodes, ApplicationParameters.Features.ExitOnRebootDetected));
+".FormatWith(ApplicationParameters.Features.UsePackageExitCodes, ApplicationParameters.Features.ExitOnRebootDetected, ApplicationParameters.Features.UseEnhancedExitCodes));
 
             "chocolatey".Log().Info(ChocolateyLoggers.Important, "See It In Action");
             "chocolatey".Log().Info(@"

src/chocolatey/infrastructure.app/services/ChocolateyPackageService.cs

@@ -812,8 +812,8 @@ public virtual ConcurrentDictionary<string, PackageResult> Install(ChocolateyCon
             }
             finally
             {
-                var installFailures = ReportActionSummary(packageInstalls, "installed");
-                if (installFailures != 0 && Environment.ExitCode == 0)
+                var actionSummaryResult = ReportActionSummary(packageInstalls, "installed");
+                if (actionSummaryResult.Failures != 0 && Environment.ExitCode == 0)
                 {
                     Environment.ExitCode = 1;
                 }
@@ -1117,7 +1117,7 @@ public void UpgradeDryRun(ChocolateyConfiguration config)
 
             if (config.RegularOutput)
             {
-                var noopFailures = ReportActionSummary(noopUpgrades, "can upgrade");
+                var actionSummaryResult = ReportActionSummary(noopUpgrades, "can upgrade");
             }
 
             RandomlyNotifyAboutLicensedFeatures(config);
@@ -1177,12 +1177,17 @@ public virtual ConcurrentDictionary<string, PackageResult> Upgrade(ChocolateyCon
             }
             finally
             {
-                var upgradeFailures = ReportActionSummary(packageUpgrades, "upgraded");
-                if (upgradeFailures != 0 && Environment.ExitCode == 0)
+                var actionSummaryResult = ReportActionSummary(packageUpgrades, "upgraded");
+                if (actionSummaryResult.Failures != 0 && Environment.ExitCode == 0)
                 {
                     Environment.ExitCode = 1;
                 }
 
+                if (config.Features.UseEnhancedExitCodes && (actionSummaryResult.Successes + actionSummaryResult.Failures == 0) && Environment.ExitCode == 0)
+                {
+                    Environment.ExitCode = 2;
+                }
+
                 RandomlyNotifyAboutLicensedFeatures(config);
             }
 
@@ -1274,13 +1279,13 @@ public virtual ConcurrentDictionary<string, PackageResult> Uninstall(ChocolateyC
             }
             finally
             {
-                var uninstallFailures = ReportActionSummary(packageUninstalls, "uninstalled");
-                if (uninstallFailures != 0 && Environment.ExitCode == 0)
+                var actionSummaryResult = ReportActionSummary(packageUninstalls, "uninstalled");
+                if (actionSummaryResult.Failures != 0 && Environment.ExitCode == 0)
                 {
                     Environment.ExitCode = 1;
                 }
 
-                if (uninstallFailures != 0)
+                if (actionSummaryResult.Failures != 0)
                 {
                     this.Log().Warn(@"
 If a package uninstall is failing and/or you've already uninstalled the
@@ -1428,7 +1433,7 @@ private void BuildInstallExample(string packageName, StringBuilder sb, string co
             }
         }
 
-        private int ReportActionSummary(ConcurrentDictionary<string, PackageResult> packageResults, string actionName)
+        private (int Successes, int Failures, int Warnings, int RebootPackages) ReportActionSummary(ConcurrentDictionary<string, PackageResult> packageResults, string actionName)
         {
             var successes = packageResults.OrEmpty().Where(p => p.Value.Success && !p.Value.Inconclusive).OrderBy(p => p.Value.Name);
             var failures = packageResults.Count(p => !p.Value.Success);
@@ -1496,7 +1501,7 @@ The recent package changes indicate a reboot is necessary.
                 }
             }
 
-            return failures;
+            return (successes.Count(), failures, warnings, rebootPackages);
         }
 
         public virtual void HandlePackageUninstall(PackageResult packageResult, ChocolateyConfiguration config)