feat: add --debug-compile-stdin to read main.nr from STDIN for testing

[michaeljklein]

Description

Problem*

Prerequisite of #7991

Summary*

• Accept main.nr from STDIN when --debug-compile-stdin is enabled
• Use an implicit Nargo.toml

Additional Context

Not testing here because I plan to add tests in a follow up PR, but I could add a smoke test

Documentation*

Check one:

• No documentation needed.
• Documentation included in this PR.
• [For Experimental Features] Documentation to be submitted in a separate PR.

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.

[asterite]

I'm trying it like this:

echo "fn main() {}" | nargo compile --debug-compile-stdin

and I get this error:

Cannot find file src/main.nr which is defaulted due to specifying `type = "bin"` in Nargo.toml

I think it's erroring before reaching the new conditional.

[michaeljklein]

@asterite where does nargo point to on your path?

With $NARGO="target/debug/nargo", I'm getting:

❯ cat src/main.nr | $NARGO compile --debug-compile-stdin
❯ echo "fn main() {}" | $NARGO compile --debug-compile-stdin
❯ echo "fn main() {}" | $NARGO compile --debug-compile-stdin --print-acir
Compiled ACIR for main (unoptimized):
func 0
current witness index : _0
private parameters indices : []
public parameters indices : []
return value indices : []

[asterite]

Huh, now it's working. I did git pull, I don't know if the last merge did it, or maybe I was at an old point (though it was the first time I jumped into this branch).

I guess nevermind then, sorry!

[michaeljklein]

@asterite all good

[asterite]

Looks great!