source tag doubles newlines in certain circumstances
ibrahima opened this issue · comments
I think there's some kind of issue with interpolation/substitution with the source tag - for instance, if I do something like
const baz = "baz\nquux\ngarply";
source`
Foo
Bar
${baz}
`where baz contains newlines, the result will have all the newlines within baz doubled:
Foo
Bar
baz
quux
garply
but I would have expected
Foo
Bar
baz
quux
garply
This only happens if the interpolation is preceded by a newline.
Interestingly, if I do something like
source`${baz}`the newlines actually get turned into spaces, which is also not what I would have expected.
I think it has something to do with the fact that source blocks attempt to match the outer indentation level when you interpolate a variable? I.e.,
source`
Foo:
Bar
${baz}
`becomes
Foo:
Bar
baz
quux
garply
Wrote up some specs, and a possible fix, in #114
Let me know if that seems good! Unfortunately javascript doesn't have a horizontal whitespace character class so I had to use this trick: https://stackoverflow.com/a/3469155/90551 . Maybe there's a better way though?
