Keep column alignment paddings does not respect line continuation

[dcsobral]

I expected this code snippet not to be reformatted when using shfmt -kp -ci 2 -d:

     curl -X POST -d '{
         "ref": "refs/tags/'"$TAG"'",
         "sha": '"$TAG_SHA"'
-      }'                                             \
-      -H "Content-Type: application/json"            \
+      }' \
+      -H "Content-Type: application/json" \
       -H "Authorization: token $GITHUB_ACCESS_TOKEN" \
       "https://api.github.com/repos/${TRAVIS_REPO_SLUG}/git/refs"

Specifically, I'd expect \ not to be moved when -kp is used. Issue #344 is related, though not the same.

[mvdan]

This indeed seems like a bug. Thanks for reporting.

[mvdan]

Hmm, this is trickier than I thought because we don't record any position information for escaped newlines, so we can't at the moment preserve the padding/alignment.

[mvdan]

I'm not going to work on this. -kp works on tokens, and escaped newlines are not tokens. They are skipped by the parser (just like in all shells), and they are only encoded in the syntax tree by how the previous and following tokens are on different lines.

So we don't have the information necessary to know in what column an escaped newline was. Adding that would complicate the parser and syntax tree, and I just don't think it's worth the effort. Closing for now.