uv add pkg adds extraneous new lines in project.dependencies if the pyproject.toml has CRLF ending

[Ravencentric]

I encountered this when I ported my existing pyproject.toml to use uv on Windows 11. Here's the reproduction with powershell on Windows 11:

❯ uv --version
uv 0.4.15 (0d81bfbc6 2024-09-21)

Setup a dummy project:

❯ uv init hello-world
Initialized project `hello-world` at `C:\Users\raven\Documents\GitHub\hello-world`

❯ cd .\hello-world\

❯ uv add pydantic httpx tomli requests typing-extensions wheel importlib-metadata
Using Python 3.12.4 interpreter at: C:\Users\raven\AppData\Local\Programs\Python\Python312\python.exe
Creating virtual environment at: .venv
Resolved 19 packages in 19ms
Installed 18 packages in 50ms
 + annotated-types==0.7.0
 + anyio==4.6.0
 + certifi==2024.8.30
 + charset-normalizer==3.3.2
 + h11==0.14.0
 + httpcore==1.0.5
 + httpx==0.27.2
 + idna==3.10
 + importlib-metadata==8.5.0
 + pydantic==2.9.2
 + pydantic-core==2.23.4
 + requests==2.32.3
 + sniffio==1.3.1
 + tomli==2.0.1
 + typing-extensions==4.12.2
 + urllib3==2.2.3
 + wheel==0.44.0
 + zipp==3.20.2

Everything looks fine here, uv created pyproject.toml file ends with LF on windows:

❯ cat .\pyproject.toml
[project]
name = "hello-world"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.12"
dependencies = [
    "httpx>=0.27.2",
    "importlib-metadata>=8.5.0",
    "pydantic>=2.9.2",
    "requests>=2.32.3",
    "tomli>=2.0.1",
    "typing-extensions>=4.12.2",
    "wheel>=0.44.0",
]

Add another dep, still fine, still ends with LF.

❯ uv add pyyaml
Resolved 20 packages in 20ms
Installed 1 package in 9ms
 + pyyaml==6.0.2

❯ cat .\pyproject.toml
[project]
name = "hello-world"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.12"
dependencies = [
    "httpx>=0.27.2",
    "importlib-metadata>=8.5.0",
    "pydantic>=2.9.2",
    "pyyaml>=6.0.2",
    "requests>=2.32.3",
    "tomli>=2.0.1",
    "typing-extensions>=4.12.2",
    "wheel>=0.44.0",
]

Change LF to CRLF:

❯ $text = Get-Content .\pyproject.toml
❯ echo $text > .\pyproject.toml

Check again:

❯ cat .\pyproject.toml
[project]
name = "hello-world"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.12"
dependencies = [
    "httpx>=0.27.2",
    "importlib-metadata>=8.5.0",
    "pydantic>=2.9.2",
    "pyyaml>=6.0.2",
    "requests>=2.32.3",
    "tomli>=2.0.1",
    "typing-extensions>=4.12.2",
    "wheel>=0.44.0",
]

Add a new dep

❯ uv add attrs
Resolved 21 packages in 229ms
Prepared 1 package in 168ms
Installed 1 package in 11ms
 + attrs==24.2.0

Extraneous new lines got added and the ending got changed to LF

❯ cat .\pyproject.toml
[project]
name = "hello-world"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.12"
dependencies = [

    "attrs>=24.2.0",

    "httpx>=0.27.2",

    "importlib-metadata>=8.5.0",

    "pydantic>=2.9.2",

    "pyyaml>=6.0.2",

    "requests>=2.32.3",

    "tomli>=2.0.1",

    "typing-extensions>=4.12.2",

    "wheel>=0.44.0",
]

[charliermarsh]

Oh interesting, thank you for this.

[my1e5]

This bug also affects tool.uv.dev-dependencies in the same way.