fix: ensure the virtual environment is .venv for uv

Author: KingMichaelPark

lua/mason-core/installer/managers/pypi.lua

@@ -15,28 +15,34 @@ local spawn = require "mason-core.spawn"
 local M = {}
 
 local use_uv = settings.current.pip.use_uv
-local VENV_DIR = "venv"
+local VENV_DIR
+if use_uv then
+    VENV_DIR = ".venv"
+else
+    VENV_DIR = "venv"
+end
 
 ---@async
 ---@param candidates string[]
 local function resolve_python3(candidates)
     local is_executable = _.compose(_.equals(1), vim.fn.executable)
     a.scheduler()
-    if use_uv then
-        candidates = { "uv" }
-    end
     local available_candidates = _.filter(is_executable, candidates)
     for __, candidate in ipairs(available_candidates) do
-        ---@type string
-        local version_output = spawn[candidate]({ "--version" }):map(_.prop "stdout"):get_or_else ""
-        local ok, version
-        if use_uv then
-            ok, version = pcall(semver.new, version_output:match "uv (%d+.%d+.%d+)")
-        else
-            ok, version = pcall(semver.new, version_output:match "Python (3%.%d+.%d+)")
-        end
-        if ok then
-            return { executable = candidate, version = version }
+        if use_uv and candidate == "uv" then
+            ---@type string
+            local version_output = spawn[candidate]({ "--version" }):map(_.prop "stdout"):get_or_else ""
+            local ok, version = pcall(semver.new, version_output:match "uv (%d+.%d+.%d+).*")
+            if ok then
+                return { executable = candidate, version = version }
+            end
+        elseif not use_uv then
+            ---@type string
+            local version_output = spawn[candidate]({ "--version" }):map(_.prop "stdout"):get_or_else ""
+            local ok, version = pcall(semver.new, version_output:match "Python (3%.%d+.%d+)")
+            if ok then
+                return { executable = candidate, version = version }
+            end
         end
     end
     return nil
@@ -86,14 +92,14 @@ local function create_venv(pkg)
     local supported_python_versions = providers.pypi.get_supported_python_versions(pkg.name, pkg.version):get_or_nil()
 
     -- 1. Resolve stock python3 installation.
-    local stock_candidates = platform.is.win and { "python", "python3" } or { "python3", "python" }
+    local stock_candidates = platform.is.win and { "python", "python3", "uv" } or { "python3", "python", "uv" }
     local stock_target = resolve_python3(stock_candidates)
     if stock_target then
         log.fmt_debug("Resolved stock python3 installation version %s", stock_target.version)
     end
 
     -- 2. Resolve suitable versioned python3 installation (python3.12, python3.11, etc.).
-    local versioned_candidates = {}
+    local versioned_candidates = { "uv" }
     if supported_python_versions ~= nil then
         if stock_target and not pep440_check_version(tostring(stock_target.version), supported_python_versions) then
             log.fmt_debug("Finding versioned candidates for %s", supported_python_versions)
@@ -113,7 +119,8 @@ local function create_venv(pkg)
     -- 3. If a versioned python3 installation was not found, warn the user if the stock python3 installation is outside
     -- the supported version range.
     if
-        target == stock_target
+        use_uv == false
+        and target == stock_target
         and supported_python_versions ~= nil
         and not pep440_check_version(tostring(target.version), supported_python_versions)
     then
@@ -135,9 +142,7 @@ local function create_venv(pkg)
         end
     end
 
-    log.fmt_debug("Found python3 installation version=%s, executable=%s", target.version, target.executable)
     ctx.stdio_sink.stdout "Creating virtual environment…\n"
-
     if use_uv then
         log.fmt_debug("Found uv installation version=%s, executable=%s", target.version, target.executable)
         return ctx.spawn[target.executable] { "venv", VENV_DIR }
@@ -170,6 +175,9 @@ end
 ---@param args SpawnArgs
 local function venv_python(args)
     local ctx = installer.context()
+    if use_uv then
+        return ctx.spawn[{ "uv", "venv" }](args)
+    end
     return find_venv_executable(ctx, "python"):and_then(function(python_path)
         return ctx.spawn[path.concat { ctx.cwd:get(), python_path }](args)
     end)
@@ -181,14 +189,14 @@ end
 local function pip_install(pkgs, extra_args)
     if use_uv then
         local ctx = installer.context()
+
         local task = ctx.spawn["uv"] {
             "pip",
             "install",
             "-U",
             extra_args or vim.NIL,
             pkgs,
         }
-        -- vim.api.nvim_set_current_dir(curdir)
         return task
     else
         return venv_python {