Support multiline prerequisites

[nk9]

Implemented with casey/just#1551

Examples of now-valid syntax:

default: a \
         b \
         c
a:
  echo a
b:
  echo b
c:
  echo c

default: a\
b\
c
a:
  echo a
b:
  echo b
c:
  echo c

And this should be marked as invalid:

default: a\ b

[laniakea64]

Hi @nk9 , I've been playing with this syntax for vim-just and found it works with much more than just recipe prerequisites. Although I can't help with Sublime syntax, wondering if this is extensive enough that we should work together on a test case justfile for this?

To illustrate, the following is now a valid justfile in pre-release just - https://github.com/NoahTheDuke/vim-just/blob/just-prerelease/tests/cases/line-continuations.just
Is it missing any other cases where this new line continuation syntax works?

[nk9]

Hmm, interesting. I wonder if that was intentional. Let's ask @casey about it.

[laniakea64]

To illustrate, the following is now a valid justfile in pre-release just -

This file is now in a branch of the vim-just repo, updated the link above and added a few extra cases. It seems this new line continuation syntax also works in interpolations, provided that the line following the continuation starts with the same indentation as the recipe body's indentation (although what comes after that can include additional indentation).