Frontmatter and cargo script support

[mominul]

Currently this code which uses nightly -Z script cargo feature is not accepted:

#!/usr/bin/env cargo
---cargo
package.edition = "2024"
[dependencies]

---

fn main() {
    println!("Hello, world!");
    println!("Welcome to PackHub!");
}

Cargo invocation:

cargo +nightly -Zscript script.rs

[mominul]

I am interested in working on implementing this feature. Is there anyone available to mentor?

[ShoyuVanilla]

#t-compiler/rust-analyzer > Frontmatter support for cargo script
#t-compiler/rust-analyzer > Frontmatter vs `import_rules!` for scripts

[ChayimFriedman2]

The summarization of the discussion @ShoyuVanilla linked (read it) is: we can't support this feature as it stands currently. If you want to help, convince T-cargo to give cargo script files a unique extension.

We can still parse the syntax so it won't give a syntax error, but that's about it.

[ChayimFriedman2]

We can support it if the user explicitly list all of its script files (like linkedProjects), but it kinda makes the point of a script moot.

[heaths]

As of version 0.3.2658, frontmatter no longer causes a syntax error: #20854; however, if you add the script files to the rust-analyzer.linkedProjects setting, those syntax errors come back:

You do get code completion support, though.

[ShoyuVanilla]

I have a WIP local branch that fixes the syntax error as well as automated frontmatter discovery feature. Will not take too long to open it as a PR