Evaluate OutputFileName and OutputDirectory Item Metadata

[T-Ernst]

This adds the missing functionality to evaluate Item Metadata from T4Transform and T4Preprocess in T4.BuildTools.

Furthermore, the T4Preprocess items have their namespace calculated automatically from their relative path; thereby mimicking the behavior of the legacy T4 external tool of Visual Studio.

Also a bug has been fixed when a template itself defines the output extension via <#@ output extension=".whatever" #>.

This fixes the following open Issues:

• T4.BuildTools fails to preprocess template in non-root direcftory #191
• T4.BuildTools fails to generate preprocessed files in obj dir. #182
• T4.BuildTools OutputDirectory/OutputFileName #180
• output extension directive #2

The automatic namespace calculation may fix #183, although OP requests an explicit override; this could be resolved with further Item Metadata. I'm happy to implement this if required.

[T-Ernst]

@dotnet-policy-service agree company="dSPACE GmbH"

[prokopCerny]

Any blockers on this? Fixing the ignored extension directive inside of the template would be most welcome.

[T-Ernst]

Any blockers on this? Fixing the ignored extension directive inside of the template would be most welcome.

Still waiting for someone to review. Unfortunately @mhutch hasn't been active here in months and it's unclear to me if Microsoft has completely given up on T4.

[mhutch]

Any blockers on this? Fixing the ignored extension directive inside of the template would be most welcome.

Still waiting for someone to review. Unfortunately @mhutch hasn't been active here in months

I no longer work at Microsoft and am currently taking a break from software development to focus on metalsmithing. I intend to get back to maintaining this at some point, however I no longer have commit access (despite being the sole maintainer) so have forked it into my own GitHub account.