fix: prevent ariadne from panicking on empty stdin/file

[daschinmoy21]

Fixes oppiliappan#78

When statix receives an empty string via stdin, an empty Report is generated. Passing an empty string to ariadne's Source::from causes an index out of bounds panic. Supplying a string with a single space as a fallback prevents this panic while keeping the error location at byte offset 0.

Output after this fix-

echo "" | nix run . -- check -s

[E00] Error: Syntax error
╭─[:1:1]
│
1 │
· │
· ╰─ Unexpected end of file
───╯

[mightyiam]

How about a test for this?

[daschinmoy21]

Yea exactly i actually made a test last night. Will raise a pr in the evening after college ends

[mightyiam]

Some conflicts

[daschinmoy21]

On it

[daschinmoy21]

Should be good now. handles empty stdin and files now. Now it returns

[E00] Error: Syntax error
   --> <stdin>:1:1
    |
    = Unexpected end of file

[E00] Error: Syntax error
   --> empty_nix_file.nix:1:1
    |
    = Unexpected end of file

[daschinmoy21]

I checked the lock file and turns out ariadne crate quite outdated. statix is using v0.1.3. latest is 0.6.0 which also fixes the empty stdin panic we are trying to solve. other additional change required would be in traits.rs,change

   CliReport::build(report_kind, src_id, offset)

to

 CliReport::build(report_kind, (src_id, offset..offset))

Post update it now returns

printf "" | cargo run -- check -s
    Finished [`dev` profile [unoptimized + debuginfo]](https://doc.rust-lang.org/cargo/reference/profiles.html#default-profiles) target(s) in 0.12s
     Running `target/debug/statix check -s`
[00] Error: Syntax error
   ╭─[ <stdin>:1:1 ]
   │
 1 │
   │ │
   │ ╰─ Unexpected end of file