From fd6c129298e1302c4a96c4d4b56b83f2dcc1838c Mon Sep 17 00:00:00 2001
From: Jon Skeet <skeet@pobox.com>
Date: Tue, 22 Apr 2014 16:27:32 +0100
Subject: [PATCH] Munge protoc's error format into a VS-C#-compatible output
 format.

Fixes issue 86.
---
 src/ProtoGen/ProgramPreprocess.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/ProtoGen/ProgramPreprocess.cs b/src/ProtoGen/ProgramPreprocess.cs
index 110bdff034..343e1f2a28 100644
--- a/src/ProtoGen/ProgramPreprocess.cs
+++ b/src/ProtoGen/ProgramPreprocess.cs
@@ -215,6 +215,11 @@ namespace Google.ProtocolBuffers.ProtoGen
             tmp = process.StandardError.ReadToEnd();
             if (tmp.Trim().Length > 0)
             {
+                // Replace protoc output with something more amenable to Visual Studio.
+                var regexMsvs = new Regex(@"(.*)\((\d+)\).* column=(\d+)\s*:\s*(.*)");
+                tmp = regexMsvs.Replace(tmp, "$1($2,$3): error CS9999: $4");
+                var regexGcc = new Regex(@"(.*):(\d+):(\d+):\s*(.*)");
+                tmp = regexGcc.Replace(tmp, "$1($2,$3): error CS9999: $4");
                 Console.Error.WriteLine(tmp);
             }
             return process.ExitCode;