nufmt produces corrupted code

[GrabbenD]

Describe the bug

• Each invocation of nufmt corrupts the code.
• nufmt inserts a line break at the start of the file if no shebang is present.

Steps To Reproduce

1. $ touch test.nu ; chmod +x test.nu

   def greet [name] {
     ["hello" $name]
   }
   
   greet "world"

2. $ cargo install --git https://github.com/nushell/nufmt
3. $ ~/.cargo/bin/nufmt test.nu

Result

(Note: I had to insert space for line breaks to be shown with Gitbub Markdown)

 
def greet [name]
{["hello" $name ]}greet "world"
 

> nu test.nu

Error: nu::parser::missing_positional

  × Missing required positional argument.
   ╭─[/home/user/me/test.nu:2:17]
 1 │ 
 2 │ def greet [name]
   ·                 ▲
   ·                 ╰── missing block
 3 │ {["hello" $name ]}greet "world"
   ╰────
  help: Usage: def {flags} <def_name> <params> <block> . Use `--help` for more information.

---

Executing nufmt again results in:

 
def greet [name]
{["hello" $name
]greet
greet
"world"
"world"
 

Expected behavior

Formatted code with a consistent structure, even across subsequent runs

Environment

Arch Linux

> rustc --version
rustc 1.82.0 (f6e511eec 2024-10-15)

> nu --version
0.100.0

[fdncred]

Agreed. This is why the readme says, This project is still very much in beta. Expect bugs, inconsistent behavior. Do not use in productive nushell scripts! I wouldn't even call it alpha or beta. It's very premature. We're looking for people to come along side us and work on it.