Modify the "conditional" operation or create a new operation that handles un-prefixing matched blocks

[mlorbetske]

//#if FOO
//Content if FOO was true
//#else
Content if FOO was false
//#endif

Should automatically un-comment Content if FOO was true when FOO is true and should leave Content if FOO was false as a literal if FOO as not true. The operation will need to buffer the content being written to see if the included block is uniformly commented out (needs a more rigorous definition) before committing it to the output stream.

https://github.com/dotnet/cli/issues/2052#issuecomment-231299842

[RehanSaeed]

It has to be noted that the case where the code block contains a comment should also be handled:

//#if FOO
// Some comment
int i = 0;
//#else
// // Some comment
// int i = 0
//#endif

I do this with the use of a double comment.

[mlorbetske]

Current design is:

//#if (FOO)
// Some comment
int i = 0;
////#else <-- Note the double comment, this indicates that comment stripping will be done if the block is active
// // Some comment
// int i = 0;
//#endif

We'll also change the defaults for languages that don't support preprocessors to use //#if instead of //if (currently used)

[RehanSaeed]

Support for multiple file formats is essential. I use:

• // as the default.
• <!-- --> for HTML and XML based formats.
• @* *@ for Razor.
• # for text based formats e.g. nginx.conf, robots.txt etc.

[mlorbetske]

The work to do the block uncommenting (blocks of line comments that is) was done here #69 and updated dotnet/templating#2 (we've moved to https://github.com/dotnet/templating). The work to set the rest of the default commenting styles is being tracked by dotnet/templating#4 in the new repo.

[seancpeters]

Conditional handling for windows batch files using "rem" line level comments, was setup in this commit:
dotnet/templating@1c0d078

Other commits in the same PR (still in progress) deal with nginx.conf comment processing using "#" line level comments. This is still in progress, but we'll be able to re-use it for other file types using that style of comments.

[seancpeters]

The nginx.conf and robots.txt setup is complete with dotnet/templating@d33aa93

[sayedihashimi]