"Unrecognized escape sequence" when remote url is a Windows path

[sbj42]

When GitInfo generates ThisAssembly.GitInfo.g.cs, it does not escape backslashes in the RepositoryUrl field. Backslashes can appear in a remote URL if someone clones a local repository on Windows.

Please consider escaping those backslashes, or if that's not possible set RepositoryUrl to an empty sting so that the build will not fail.

Steps to reproduce:

This can be reproduced simply by setting the remote url in git to a string with backslashes. For instance, in Windows CMD:

git remote set-url origin C:\foo

But for a "real-world" scenario, you can use the following:

1. On a Windows machine, clone https://github.com/sbj42/gitinfo-local-clone-bug (e.g. to C:\GitInfoTest)
2. Then clone the clone (e.g. git clone C:\GitInfoTest C:\GitInfoTestClone)
3. Open the cloned solution in Visual Studio and build it.

Expected results:

The solution should build.

The RepositoryUrl (which the program will print) should be C:\GitInfoTest. An empty string would also be acceptable, though less desirable.

Actual results:

The solution fails to build with:

1>------ Build started: Project: GitInfoTest, Configuration: Debug Any CPU ------
1>C:\GitInfoTestClone\obj\Debug\netcoreapp3.1\ThisAssembly.GitInfo.g.cs(43,46,43,48): error CS1009: Unrecognized escape sequence
1>Done building project "GitInfoTest.csproj" -- FAILED.

The problem is line 43 of ThisAssembly.GitInfo.g.cs, where the remote "url" is not properly string-escaped:

      public const string RepositoryUrl = "C:\GitInfoTest";

[sbj42]

I think this can be fixed by using "verbatim string literals" in GitInfo.cs.pp (https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/tokens/verbatim). For instance, replace this line:

      public const string RepositoryUrl = "$GitRepositoryUrl$";

with this:

      public const string RepositoryUrl = @"$GitRepositoryUrl$";

(adding the @ character)