(GH-97) Warn user if total file sizes is above 20MB

fixes #97

Source/Codecov/Program/UploadFacade.cs

@@ -14,6 +14,7 @@
 using Codecov.Terminal;
 using Codecov.Upload;
 using Codecov.Url;
+using Codecov.Utilities;
 using Codecov.Yaml;
 
 namespace Codecov.Program
@@ -112,6 +113,14 @@ public void Uploader()
                 return;
             }
 
+            // We warn if the total file size is above 20 MB
+            var fileSizes = Coverage.CoverageReports.Sum(x => FileSystem.GetFileSize(x.File));
+            if (fileSizes > 20_971_520)
+            {
+                Log.Warning($"Total file size of reports is above 20MB, this may prevent report being shown on {Url.GetUrl.Host}");
+                Log.Warning("Reduce the total upload size if this occurs");
+            }
+
             Log.Information("Uploading Reports.");
             Log.Information($"url: {Url.GetUrl.Scheme}://{Url.GetUrl.Authority}");
             Log.Verboase($"api endpoint: {Url.GetUrl}");

Source/Codecov/Utilities/FileSystem.cs

@@ -5,6 +5,12 @@ namespace Codecov.Utilities
 {
     internal static class FileSystem
     {
+        internal static long GetFileSize(string path)
+        {
+            var fileInfo = new FileInfo(path);
+            return fileInfo.Exists ? fileInfo.Length : 0;
+        }
+
         internal static string NormalizedPath(string path)
         {
             if (string.IsNullOrWhiteSpace(path))