`uv add --index` does not accept special characters in the index name

[vinibrsl]

uv throws an error when adding a custom index with a name that includes characters like hyphens or underscores. While the equal sign (=) is understandably restricted as the separator, other characters should be allowed in the index name.

$ uv add --index my_custom_index=https://customindex.test/path/to/index my_package
error: invalid value 'my_custom_index=https://customindex.test/path/to/index' for '--index <INDEX>': relative URL without a base

For more information, try '--help'.

If I rename my_custom_index to mycustomindex, the command works as expected, e.g. uv add --index mycustomindex=https://customindex.test/path/to/index my_package.

Version

$ uv --version
uv 0.4.24 (b9cd54913 2024-10-17)

Related: #7746

[zanieb]

Yeah right now they must be alphanumeric

uv/crates/uv-distribution-types/src/index.rs

Line 161 in 2153c6a

if name.chars().all(char::is_alphanumeric) {

Underscores and dashes seem pretty reasonable to me?

[charliermarsh]

Yeah that seems fine.