Fixed `$AUTO_CD` regress after previous refactoring. (#5629)

* fix autocd

* test

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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---------

Co-authored-by: a <1@1.1>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

news/fix_autocd.rst

@@ -0,0 +1,23 @@
+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* Fixed ``$AUTO_CD`` regress after previous refactoring.
+
+**Security:**
+
+* <news item>

tests/procs/test_specs.py

@@ -577,3 +577,12 @@ def test_alias_return_command_eval_inside(xession):
     assert spec.cmd == ["sudo", "echo", "1"]
     assert spec.alias_name == "xsudo"
     assert spec.threadable is True
+
+
+def test_auto_cd(xession, tmpdir):
+    xession.aliases["cd"] = lambda: "some_cd_alias"
+    dir = str(tmpdir)
+    with xession.env.swap(AUTO_CD=True):
+        spec = cmds_to_specs([[dir]], captured="object")[-1]
+    assert spec.alias.__name__ == "cd"
+    assert spec.cmd[0] == dir

xonsh/procs/specs.py

@@ -764,7 +764,7 @@ class SubprocSpec:
         ):
             return
         self.cmd.insert(0, "cd")
-        self.alias = XSH.aliases.get("cd", None)
+        self.alias = XSH.aliases.get("cd", None)[0]
 
     def resolve_executable_commands(self):
         """Resolve command executables, if applicable."""