environment.yml: Ignore editable self-dependencies #495
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Issue #494 highlights the use of "-e ./" (i.e. an editable
self-dependency) in environment.yml files.
We already work around these kinds of self-dependencies in
pyproject.toml and pixi.toml files, and our requirements.txt parser
automatically ignores any lines with pip options, hence environment.yml
is the only(?) remaining dependency file format where we're not yet
handling this.
Fix that, by recognizing this case before we emit an unnecessary error
message about it. In either case we continue parsing the remaining
lines, so the actual behavior (except for the error message) does not
need to change.
Fixes #494.