feat(tailwindcss): add detection for Phoenix projects #3831

Enhance root directory detection for the latest versions of
TailwindCSS v4, which no longer require tailwind.config.* or
postcss.config.*.

For Phoenix projects, they are typically generated or add Tailwind
installed via https://github.com/phoenixframework/tailwind which will
now be detected by scanning the mix.lock file for the included package.

Phoenix projects that install tailwindcss via package.json should still
work.

1 files changed, 1 insertions, 0 deletions

diff --git a/lsp/tailwindcss.lua b/lsp/tailwindcss.lua
index 1c5b3555..7f9af21a 100644
--- a/lsp/tailwindcss.lua
+++ b/lsp/tailwindcss.lua
@@ -117,6 +117,7 @@ return {
     }
     local fname = vim.api.nvim_buf_get_name(bufnr)
     root_files = util.insert_package_json(root_files, 'tailwindcss', fname)
+    root_files = util.insert_mix_exs(root_files, 'tailwind', fname)
     on_dir(vim.fs.dirname(vim.fs.find(root_files, { path = fname, upward = true })[1]))
   end,
 }