feat(compiler): add dtx format support

[mugabe]

No description provided.

[coveralls]

Coverage increased (+0.008%) to 98.547% when pulling 4eb7cd3 on mugabe:dtx-support into 42e81da on bemusic:master.

[dtinth]

Thanks for the PR. 😄

Is the only difference between DTX and BMS format is the space after the colon?

If so, in my opinion, we can use the same matcher by making BMS parser also allow extra space.

[mugabe]

Not only space, there also colon after header name.
Ofcourse it could be solved by one regexp too, but for me it seems much correct to split it to different matchers.

[dtinth]

I see, so that’s more than just whitespace issue. Thanks for the clarification!

[dtinth]

Can you address this comment? Then it should be ready to merge :)

[dtinth]

To avoid reassigning more variables than necessary, I recommend compacting these five lines into one:

  var matcher = matchers[options.format] || matchers.bms

[dtinth]

I missed this one: There is also a documentation block at the top of the function. Can you add the format parameter documentation too?

[mugabe]

Done

[dtinth]

Thanks!!