Subject: bug#79290: 30.2; eglot-alternatives doesn't support re-use of same program with different subcommands

From: Doug Davis <[email-masked]>
Date: Fri, 22 Aug 2025 10:37:38 -0500

When writing an `eglot-alternatives' that looks like this:

  (add-to-list 'eglot-server-programs
               `(python-base-mode
                 . ,(eglot-alternatives '(("basedpyright-langserver" "--stdio")
                                          ("uv" "run" "pyright-langserver" "--stdio")
                                          ("uv" "run" "ty" "server")
                                          "jedi-language-server"
                                          ("pyright-langserver" "--stdio")))))

an invocation of M-x eglot will fail to show the second instance of
using uv in the resulting list that appears to be passed on to
`completing-read'. (Notice the repeated use of `uv run`
https://docs.astral.sh/uv/reference/cli/#uv-run)

more info: the benefit of using `uv run` unloads the burden of using
emacs to property setup a virtual environment; uv automatically handles
running the correct installation of the invoked subcommand.