Fix zsh global install (#466)

* Revert "Use -first- instead of -default- when installing zsh global completer"

This reverts commit 95da435.

* Fix global installation for zsh

* Use -Uz when loading zsh function

argcomplete/bash_completion.d/_python-argcomplete

@@ -1,10 +1,15 @@
-#compdef -P *
+#compdef -default-
 
 # Copyright 2012-2023, Andrey Kislyuk and argcomplete contributors.
 # Licensed under the Apache License. See https://github.com/kislyuk/argcomplete for more info.
 
 # Note: both the leading underscore in the name of this file and the first line (compdef) are required by zsh
 
+# In zsh, this file is autoloaded and used as the default completer (_default).
+# There are many other special contexts we don't want to override
+# (as would be the case with `#compdef -P *`).
+# https://zsh.sourceforge.io/Doc/Release/Completion-System.html
+
 # Copy of __expand_tilde_by_ref from bash-completion
 # ZSH implementation added
 __python_argcomplete_expand_tilde_by_ref () {
@@ -115,6 +120,7 @@ __python_argcomplete_which() {
 }
 
 _python_argcomplete_global() {
+
     if [[ -n "${ZSH_VERSION-}" ]]; then
         # Store result of a regex match in the
         # BASH_REMATCH variable rather than MATCH
@@ -235,9 +241,10 @@ _python_argcomplete_global() {
 if [[ -z "${ZSH_VERSION-}" ]]; then
     complete -o default -o bashdefault -D -F _python_argcomplete_global
 else
-    autoload is-at-least
-    # Set a hook for argcomplete to be called first if no other completers are defined for the given command.
-    # "compdef _python_argcomplete_global -P *" overrides other special contexts that we want to preserve:
-    # https://zsh.sourceforge.io/Doc/Release/Completion-System.html
-    compdef _python_argcomplete_global -first-
+    # -Uz is recommended for the use of functions supplied with the zsh distribution.
+    # https://unix.stackexchange.com/a/214306
+    autoload -Uz is-at-least
+    # The comment at the top of this file causes zsh to invoke this script directly,
+    # so we must explicitly call the global completion function.
+    _python_argcomplete_global
 fi

test/test.py

@@ -80,7 +80,6 @@ def bash_repl(command="bash"):
 
 def zsh_repl(command="zsh"):
     sh = _repl_sh(command, ["--no-rcs", "-V"], non_printable_insert="%(!..)")
-    sh.run_command("autoload compinit; compinit -u")
     # Require two tabs to print all options (some tests rely on this).
     sh.run_command("setopt BASH_AUTO_LIST")
     return sh
@@ -1251,6 +1250,7 @@ def test_comp_point(self):
 class TestBashZshBase(TestShellBase):
     maxDiff = None
 
+    init_cmd = None
     # 'dummy' argument unused; checks multi-command registration works
     # by passing 'prog' as the second argument.
     install_cmd = 'eval "$(register-python-argcomplete dummy prog)"'
@@ -1262,8 +1262,12 @@ def setUp(self):
         path = ":".join([os.path.join(BASE_DIR, "scripts"), TEST_DIR, "$PATH"])
         sh.run_command("export PATH={0}".format(path))
         sh.run_command("export PYTHONPATH={0}".format(BASE_DIR))
-        output = sh.run_command(self.install_cmd)
-        self.assertEqual(output, "")
+        if self.init_cmd is not None:
+            output = sh.run_command(self.init_cmd)
+            self.assertEqual(output, "")
+        if self.install_cmd is not None:
+            output = sh.run_command(self.install_cmd)
+            self.assertEqual(output, "")
         # Register a dummy completion with an external argcomplete script
         # to ensure this doesn't overwrite our previous registration.
         output = sh.run_command('eval "$(register-python-argcomplete dummy --external-argcomplete-script dummy)"')
@@ -1311,6 +1315,8 @@ def test_nounset(self):
 
 
 class TestZsh(TestBashZshBase, unittest.TestCase):
+    init_cmd = "autoload compinit; compinit -u"
+
     skipped = [
         "test_parse_special_characters",
         "test_parse_special_characters_dollar",
@@ -1404,7 +1410,13 @@ class TestBashGlobal(TestBash, TestBashZshGlobalBase):
 
 
 class TestZshGlobal(TestZsh, TestBashZshGlobalBase):
-    pass
+    # In zsh, the file is not sourced directly;
+    # it is added to fpath and autoloaded by the completion system.
+    # Running `eval "$(activate-global-python-argcomplete --dest=-)"`
+    # as in bash does *not* work in zsh!
+    zsh_fpath = os.path.join(os.path.abspath(os.path.dirname(argcomplete.__file__)), "bash_completion.d")
+    init_cmd = f'fpath=( {zsh_fpath} "${{fpath[@]}}" ); autoload compinit; compinit -u'
+    install_cmd = None
 
 
 class Shell: