[v2] Proposal - "rest of line" strings

[zkat]

This was proposed by @imsnif a while back, and I don't think we gave it a proper discussion. I think there's a compelling argument to having "rest of line" raw strings.

So here's the idea, and feel free to lmk what you think!

A value that starts with #! will treat all following characters as literal string characters until the new Newline

That is, the the following two nodes are equivalent:

node1 foo=bar #!cargo run -- C:\foo\bar.exe # //foo
node2 foo=bar ##"cargo run -- C:\foo\bar.exe # //foo"##

Notice how we don't need multiple ## because the actual ending is the Newline, so having more # along the way doesn't matter.

I'm not like, super genki about this looking at them both side-by-side, but I think there's still some value in it for some very real use-cases (like zellij's cmd nodes!).

[IceDragon200]

#! is typically shebang or hashbang, even if it's a document format, it could get confusing.

node1 foo=bar #>cargo run -- C:\foo\bar.exe # //foo
node2 foo=bar ##"cargo run -- C:\foo\bar.exe # //foo"##

I propose #> instead, > points right implying the user should look to the right for the end of the string

node {
  compile foo=bar #>mix compile
  release bar=foo #>mix release --overwrite
  run fizz=buzz {
    cmd #>/opt/app/bin/app run
    env {
      CONFIG_PATH #>/etc/app/config.kdl
    }
  }
}

[larsgw]

IMO this might overcomplicate the format a bit. You could get the following file, which compiles but behaves unexpectedly.

node { foo #> bar; }
node #>bar {
  baz qux
}

is equivalent to

node {
  foo " bar; }"
  node "bar {"
  baz "qux"
}

[zkat]

Yeah that makes sense. I’m also not sure it would be worth adding a FOURTH string format to the language just for two characters worth of convenience

[zkat]

Because of the footgun that Lars mentioned, I'm going to close this one. I think typing two more characters ("#) isn't really worth optimizing any further, now that simple cases can be covered by identifier strings.

[tabatkins]

Agreed, this matches with my own opinions on the matter.